qt-creator/src/plugins/texteditor/basetexteditor.cpp

/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**************************************************************************/

#include "texteditor_global.h"

#include "basetextdocument.h"
#include "basetextdocumentlayout.h"
#include "basetexteditor_p.h"
#include "behaviorsettings.h"
#include "codecselector.h"
#include "completionsettings.h"
#include "tabsettings.h"
#include "typingsettings.h"
#include "icodestylepreferences.h"
#include "texteditorconstants.h"
#include "texteditorplugin.h"
#include "syntaxhighlighter.h"
#include "tooltip.h"
#include "tipcontents.h"
#include "indenter.h"
#include "autocompleter.h"
#include "snippet.h"
#include "codeassistant.h"
#include "defaultassistinterface.h"
#include "convenience.h"
#include "texteditorsettings.h"
#include "texteditoroverlay.h"
#include "circularclipboard.h"

#include <aggregation/aggregate.h>
#include <coreplugin/actionmanager/actionmanager.h>
#include <coreplugin/actionmanager/actioncontainer.h>
#include <coreplugin/actionmanager/command.h>
#include <coreplugin/coreconstants.h>
#include <coreplugin/editormanager/editormanager.h>
#include <coreplugin/icore.h>
#include <coreplugin/infobar.h>
#include <coreplugin/manhattanstyle.h>
#include <coreplugin/id.h>
#include <extensionsystem/pluginmanager.h>
#include <find/basetextfind.h>
#include <utils/linecolumnlabel.h>
#include <utils/qtcassert.h>
#include <utils/stylehelper.h>

#include <QtCore/QCoreApplication>
#include <QtCore/QTextCodec>
#include <QtCore/QFile>
#include <QtCore/QDebug>
#include <QtCore/QTimer>
#include <QtCore/QTimeLine>
#include <QtCore/QTime>
#include <QtCore/QMimeData>
#include <QtGui/QAbstractTextDocumentLayout>
#include <QtGui/QApplication>
#include <QtGui/QKeyEvent>
#include <QtGui/QLabel>
#include <QtGui/QLayout>
#include <QtGui/QPainter>
#include <QtGui/QPrinter>
#include <QtGui/QPrintDialog>
#include <QtGui/QScrollBar>
#include <QtGui/QShortcut>
#include <QtGui/QStyle>
#include <QtGui/QSyntaxHighlighter>
#include <QtGui/QTextCursor>
#include <QtGui/QTextDocumentFragment>
#include <QtGui/QTextBlock>
#include <QtGui/QTextLayout>
#include <QtGui/QToolBar>
#include <QtGui/QInputDialog>
#include <QtGui/QMenu>
#include <QtGui/QMessageBox>
#include <QtGui/QClipboard>

//#define DO_FOO

/*!
    \namespace TextEditor
    \brief The TextEditor namespace contains the base text editor and several classes which
    provide supporting functionality like snippets, highlighting, \l{CodeAssist}{code assist},
    indentation and style, and others.
*/

/*!
    \namespace TextEditor::Internal
    \internal
*/

using namespace TextEditor;
using namespace TextEditor::Internal;

namespace TextEditor {
namespace Internal {

class TextEditExtraArea : public QWidget {
    BaseTextEditorWidget *textEdit;
public:
    TextEditExtraArea(BaseTextEditorWidget *edit):QWidget(edit) {
        textEdit = edit;
        setAutoFillBackground(true);
    }
public:

    QSize sizeHint() const {
        return QSize(textEdit->extraAreaWidth(), 0);
    }
protected:
    void paintEvent(QPaintEvent *event){
        textEdit->extraAreaPaintEvent(event);
    }
    void mousePressEvent(QMouseEvent *event){
        textEdit->extraAreaMouseEvent(event);
    }
    void mouseMoveEvent(QMouseEvent *event){
        textEdit->extraAreaMouseEvent(event);
    }
    void mouseReleaseEvent(QMouseEvent *event){
        textEdit->extraAreaMouseEvent(event);
    }
    void leaveEvent(QEvent *event){
        textEdit->extraAreaLeaveEvent(event);
    }
    void contextMenuEvent(QContextMenuEvent *event) {
        textEdit->extraAreaContextMenuEvent(event);
    }

    void wheelEvent(QWheelEvent *event) {
        QCoreApplication::sendEvent(textEdit->viewport(), event);
    }
};

} // namespace Internal
} // namespace TextEditor

Core::IEditor *BaseTextEditorWidget::openEditorAt(const QString &fileName, int line, int column,
                                 const Core::Id &editorKind,
                                 Core::EditorManager::OpenEditorFlags flags,
                                 bool *newEditor)
{
    Core::EditorManager *editorManager = Core::EditorManager::instance();
    editorManager->cutForwardNavigationHistory();
    editorManager->addCurrentPositionToNavigationHistory();
    Core::IEditor *editor = editorManager->openEditor(fileName, editorKind,
            flags, newEditor);
    TextEditor::ITextEditor *texteditor = qobject_cast<TextEditor::ITextEditor *>(editor);
    if (texteditor && line != -1) {
        texteditor->gotoLine(line, column);
        return texteditor;
    }

    return editor;
}

static void convertToPlainText(QString &txt)
{
    QChar *uc = txt.data();
    QChar *e = uc + txt.size();

    for (; uc != e; ++uc) {
        switch (uc->unicode()) {
        case 0xfdd0: // QTextBeginningOfFrame
        case 0xfdd1: // QTextEndOfFrame
        case QChar::ParagraphSeparator:
        case QChar::LineSeparator:
            *uc = QLatin1Char('\n');
            break;
        case QChar::Nbsp:
            *uc = QLatin1Char(' ');
            break;
        default:
            ;
        }
    }
}

static bool isModifierKey(int key)
{
    return key == Qt::Key_Shift
            || key == Qt::Key_Control
            || key == Qt::Key_Alt
            || key == Qt::Key_Meta;
}

static const char kTextBlockMimeType[] = "application/vnd.nokia.qtcreator.blocktext";
static const char kVerticalTextBlockMimeType[] = "application/vnd.nokia.qtcreator.vblocktext";


BaseTextEditorWidget::BaseTextEditorWidget(QWidget *parent)
    : QPlainTextEdit(parent)
{
    d = new BaseTextEditorPrivate;
    d->q = this;
    d->m_extraArea = new TextEditExtraArea(this);
    d->m_extraArea->setMouseTracking(true);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);

    d->m_overlay = new TextEditorOverlay(this);
    d->m_snippetOverlay = new TextEditorOverlay(this);
    d->m_searchResultOverlay = new TextEditorOverlay(this);
    d->m_refactorOverlay = new RefactorOverlay(this);

    d->setupDocumentSignals(d->m_document);

    d->m_lastScrollPos = -1;

    // from RESEARCH

    setLayoutDirection(Qt::LeftToRight);
    viewport()->setMouseTracking(true);
    d->extraAreaSelectionAnchorBlockNumber
        = d->extraAreaToggleMarkBlockNumber
        = d->extraAreaHighlightFoldedBlockNumber
        = -1;

    d->visibleFoldedBlockNumber = d->suggestedVisibleFoldedBlockNumber = -1;

    connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(slotUpdateExtraAreaWidth()));
    connect(this, SIGNAL(modificationChanged(bool)), this, SLOT(slotModificationChanged(bool)));
    connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(slotCursorPositionChanged()));
    connect(this, SIGNAL(updateRequest(QRect, int)), this, SLOT(slotUpdateRequest(QRect, int)));
    connect(this, SIGNAL(selectionChanged()), this, SLOT(slotSelectionChanged()));

//     (void) new QShortcut(tr("CTRL+L"), this, SLOT(centerCursor()), 0, Qt::WidgetShortcut);
//     (void) new QShortcut(tr("F9"), this, SLOT(slotToggleMark()), 0, Qt::WidgetShortcut);
//     (void) new QShortcut(tr("F11"), this, SLOT(slotToggleBlockVisible()));

#ifdef DO_FOO
    (void) new QShortcut(tr("CTRL+D"), this, SLOT(doFoo()));
#endif


    // parentheses matcher
    d->m_formatRange = true;
    d->m_matchFormat.setForeground(Qt::red);
    d->m_rangeFormat.setBackground(QColor(0xb4, 0xee, 0xb4));
    d->m_mismatchFormat.setBackground(Qt::magenta);
    d->m_parenthesesMatchingTimer = new QTimer(this);
    d->m_parenthesesMatchingTimer->setSingleShot(true);
    connect(d->m_parenthesesMatchingTimer, SIGNAL(timeout()), this, SLOT(_q_matchParentheses()));

    d->m_highlightBlocksTimer = new QTimer(this);
    d->m_highlightBlocksTimer->setSingleShot(true);
    connect(d->m_highlightBlocksTimer, SIGNAL(timeout()), this, SLOT(_q_highlightBlocks()));

    d->m_animator = 0;

    d->m_searchResultFormat.setBackground(QColor(0xffef0b));

    slotUpdateExtraAreaWidth();
    updateHighlights();
    setFrameStyle(QFrame::NoFrame);

    d->m_delayedUpdateTimer = new QTimer(this);
    d->m_delayedUpdateTimer->setSingleShot(true);
    connect(d->m_delayedUpdateTimer, SIGNAL(timeout()), viewport(), SLOT(update()));

    d->m_moveLineUndoHack = false;
}

BaseTextEditorWidget::~BaseTextEditorWidget()
{
    delete d;
    d = 0;
}

QString BaseTextEditorWidget::mimeType() const
{
    return d->m_document->mimeType();
}

void BaseTextEditorWidget::setMimeType(const QString &mt)
{
    d->m_document->setMimeType(mt);
}

void BaseTextEditorWidget::print(QPrinter *printer)
{
    const bool oldFullPage =  printer->fullPage();
    printer->setFullPage(true);
    QPrintDialog *dlg = new QPrintDialog(printer, this);
    dlg->setWindowTitle(tr("Print Document"));
    if (dlg->exec() == QDialog::Accepted) {
        d->print(printer);
    }
    printer->setFullPage(oldFullPage);
    delete dlg;
}

static int foldBoxWidth(const QFontMetrics &fm)
{
    const int lineSpacing = fm.lineSpacing();
    return lineSpacing + lineSpacing%2 + 1;
}

static void printPage(int index, QPainter *painter, const QTextDocument *doc,
                      const QRectF &body, const QRectF &titleBox,
                      const QString &title)
{
    painter->save();

    painter->translate(body.left(), body.top() - (index - 1) * body.height());
    QRectF view(0, (index - 1) * body.height(), body.width(), body.height());

    QAbstractTextDocumentLayout *layout = doc->documentLayout();
    QAbstractTextDocumentLayout::PaintContext ctx;

    painter->setFont(QFont(doc->defaultFont()));
    QRectF box = titleBox.translated(0, view.top());
    int dpix = painter->device()->logicalDpiX();
    int dpiy = painter->device()->logicalDpiY();
    int mx = 5 * dpix / 72.0;
    int my = 2 * dpiy / 72.0;
    painter->fillRect(box.adjusted(-mx, -my, mx, my), QColor(210, 210, 210));
    if (!title.isEmpty())
        painter->drawText(box, Qt::AlignCenter, title);
    const QString pageString = QString::number(index);
    painter->drawText(box, Qt::AlignRight, pageString);

    painter->setClipRect(view);
    ctx.clip = view;
    // don't use the system palette text as default text color, on HP/UX
    // for example that's white, and white text on white paper doesn't
    // look that nice
    ctx.palette.setColor(QPalette::Text, Qt::black);

    layout->draw(painter, ctx);

    painter->restore();
}

void BaseTextEditorPrivate::print(QPrinter *printer)
{
    QTextDocument *doc = q->document();

    QString title = q->displayName();
    if (title.isEmpty())
        printer->setDocName(title);


    QPainter p(printer);

    // Check that there is a valid device to print to.
    if (!p.isActive())
        return;

    doc = doc->clone(doc);

    QTextOption opt = doc->defaultTextOption();
    opt.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
    doc->setDefaultTextOption(opt);

    (void)doc->documentLayout(); // make sure that there is a layout


    QColor background = q->palette().color(QPalette::Base);
    bool backgroundIsDark = background.value() < 128;

    for (QTextBlock srcBlock = q->document()->firstBlock(), dstBlock = doc->firstBlock();
         srcBlock.isValid() && dstBlock.isValid();
         srcBlock = srcBlock.next(), dstBlock = dstBlock.next()) {


        QList<QTextLayout::FormatRange> formatList = srcBlock.layout()->additionalFormats();
        if (backgroundIsDark) {
            // adjust syntax highlighting colors for better contrast
            for (int i = formatList.count() - 1; i >=0; --i) {
                QTextCharFormat &format = formatList[i].format;
                if (format.background().color() == background) {
                    QBrush brush = format.foreground();
                    QColor color = brush.color();
                    int h,s,v,a;
                    color.getHsv(&h, &s, &v, &a);
                    color.setHsv(h, s, qMin(128, v), a);
                    brush.setColor(color);
                    format.setForeground(brush);
                }
                format.setBackground(Qt::white);
            }
        }

        dstBlock.layout()->setAdditionalFormats(formatList);
    }

    QAbstractTextDocumentLayout *layout = doc->documentLayout();
    layout->setPaintDevice(p.device());

    int dpiy = p.device()->logicalDpiY();
    int margin = (int) ((2/2.54)*dpiy); // 2 cm margins

    QTextFrameFormat fmt = doc->rootFrame()->frameFormat();
    fmt.setMargin(margin);
    doc->rootFrame()->setFrameFormat(fmt);

    QRectF pageRect(printer->pageRect());
    QRectF body = QRectF(0, 0, pageRect.width(), pageRect.height());
    QFontMetrics fontMetrics(doc->defaultFont(), p.device());

    QRectF titleBox(margin,
                    body.top() + margin
                    - fontMetrics.height()
                    - 6 * dpiy / 72.0,
                    body.width() - 2*margin,
                    fontMetrics.height());
    doc->setPageSize(body.size());

    int docCopies;
    int pageCopies;
    if (printer->collateCopies() == true){
        docCopies = 1;
        pageCopies = printer->numCopies();
    } else {
        docCopies = printer->numCopies();
        pageCopies = 1;
    }

    int fromPage = printer->fromPage();
    int toPage = printer->toPage();
    bool ascending = true;

    if (fromPage == 0 && toPage == 0) {
        fromPage = 1;
        toPage = doc->pageCount();
    }
    // paranoia check
    fromPage = qMax(1, fromPage);
    toPage = qMin(doc->pageCount(), toPage);

    if (printer->pageOrder() == QPrinter::LastPageFirst) {
        int tmp = fromPage;
        fromPage = toPage;
        toPage = tmp;
        ascending = false;
    }

    for (int i = 0; i < docCopies; ++i) {

        int page = fromPage;
        while (true) {
            for (int j = 0; j < pageCopies; ++j) {
                if (printer->printerState() == QPrinter::Aborted
                    || printer->printerState() == QPrinter::Error)
                    goto UserCanceled;
                printPage(page, &p, doc, body, titleBox, title);
                if (j < pageCopies - 1)
                    printer->newPage();
            }

            if (page == toPage)
                break;

            if (ascending)
                ++page;
            else
                --page;

            printer->newPage();
        }

        if ( i < docCopies - 1)
            printer->newPage();
    }

UserCanceled:
    delete doc;
}


int BaseTextEditorPrivate::visualIndent(const QTextBlock &block) const
{
    if (!block.isValid())
        return 0;
    const QTextDocument *document = block.document();
    int i = 0;
    while (i < block.length()) {
        if (!document->characterAt(block.position() + i).isSpace()) {
            QTextCursor cursor(block);
            cursor.setPosition(block.position() + i);
            return q->cursorRect(cursor).x();
        }
        ++i;
    }

    return 0;
}

ITextMarkable *BaseTextEditorWidget::markableInterface() const
{
    return baseTextDocument()->documentMarker();
}

BaseTextEditor *BaseTextEditorWidget::editor() const
{
    if (!d->m_editor) {
        d->m_editor = const_cast<BaseTextEditorWidget *>(this)->createEditor();
        d->m_codeAssistant->configure(d->m_editor);
        connect(this, SIGNAL(textChanged()),
                d->m_editor, SIGNAL(contentsChanged()));
        connect(this, SIGNAL(changed()),
                d->m_editor, SIGNAL(changed()));
    }
    return d->m_editor;
}


void BaseTextEditorWidget::selectEncoding()
{
    BaseTextDocument *doc = d->m_document;
    CodecSelector codecSelector(this, doc);

    switch (codecSelector.exec()) {
    case CodecSelector::Reload: {
        QString errorString;
        if (!doc->reload(&errorString, codecSelector.selectedCodec())) {
            QMessageBox::critical(this, tr("File Error"), errorString);
            break;
        }
        break; }
    case CodecSelector::Save:
        doc->setCodec(codecSelector.selectedCodec());
        Core::EditorManager::instance()->saveEditor(editor());
        break;
    case CodecSelector::Cancel:
        break;
    }
}

QString BaseTextEditorWidget::msgTextTooLarge(quint64 size)
{
    return tr("The text is too large to be displayed (%1 MB).").
           arg(size >> 20);
}

bool BaseTextEditorWidget::createNew(const QString &contents)
{
    if (contents.size() > Core::EditorManager::maxTextFileSize()) {
        setPlainText(msgTextTooLarge(contents.size()));
        document()->setModified(false);
        return false;
    }
    setPlainText(contents);
    document()->setModified(false);
    return true;
}

void BaseTextEditorWidget::updateCannotDecodeInfo()
{
    setReadOnly(d->m_document->hasDecodingError());
    if (d->m_document->hasDecodingError()) {
        Core::InfoBarEntry info(
            QLatin1String(Constants::SELECT_ENCODING),
            tr("<b>Error:</b> Could not decode \"%1\" with \"%2\"-encoding. Editing not possible.")
            .arg(displayName()).arg(QString::fromLatin1(d->m_document->codec()->name())));
        info.setCustomButtonInfo(tr("Select Encoding"), this, SLOT(selectEncoding()));
        d->m_document->infoBar()->addInfo(info);
    } else {
        d->m_document->infoBar()->removeInfo(QLatin1String(Constants::SELECT_ENCODING));
    }
}

bool BaseTextEditorWidget::open(QString *errorString, const QString &fileName, const QString &realFileName)
{
    if (d->m_document->open(errorString, fileName, realFileName)) {
        moveCursor(QTextCursor::Start);
        updateCannotDecodeInfo();
        return true;
    }
    return false;
}

/*
  Collapses the first comment in a file, if there is only whitespace above
  */
void BaseTextEditorPrivate::foldLicenseHeader()
{
    QTextDocument *doc = q->document();
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);
    QTextBlock block = doc->firstBlock();
    const TabSettings &ts = m_document->tabSettings();
    while (block.isValid() && block.isVisible()) {
        QString text = block.text();
        if (BaseTextDocumentLayout::canFold(block) && block.next().isVisible()) {
            if (text.trimmed().startsWith(QLatin1String("/*"))) {
                BaseTextDocumentLayout::doFoldOrUnfold(block, false);
                moveCursorVisible();
                documentLayout->requestUpdate();
                documentLayout->emitDocumentSizeChanged();
                break;
            }
        }
        if (ts.firstNonSpace(text) < text.size())
            break;
        block = block.next();
    }
}

const Utils::ChangeSet &BaseTextEditorWidget::changeSet() const
{
    return d->m_changeSet;
}

void BaseTextEditorWidget::setChangeSet(const Utils::ChangeSet &changeSet)
{
    using namespace Utils;

    d->m_changeSet = changeSet;

    foreach (const ChangeSet::EditOp &op, changeSet.operationList()) {
        // ### TODO: process the edit operation

        switch (op.type) {
        case ChangeSet::EditOp::Replace:
            break;

        case ChangeSet::EditOp::Move:
            break;

        case ChangeSet::EditOp::Insert:
            break;

        case ChangeSet::EditOp::Remove:
            break;

        case ChangeSet::EditOp::Flip:
            break;

        case ChangeSet::EditOp::Copy:
            break;

        default:
            break;
        } // switch
    }
}

Core::IFile *BaseTextEditorWidget::file()
{
    return d->m_document;
}

void BaseTextEditorWidget::editorContentsChange(int position, int charsRemoved, int charsAdded)
{
    if (d->m_animator)
        d->m_animator->finish();

    d->m_contentsChanged = true;
    QTextDocument *doc = document();

    // Keep the line numbers and the block information for the text marks updated
    if (charsRemoved != 0) {
        d->updateMarksLineNumber();
        d->updateMarksBlock(document()->findBlock(position));
    } else {
        const QTextBlock posBlock = doc->findBlock(position);
        const QTextBlock nextBlock = doc->findBlock(position + charsAdded);
        if (posBlock != nextBlock) {
            d->updateMarksLineNumber();
            d->updateMarksBlock(posBlock);
            d->updateMarksBlock(nextBlock);
        } else {
            d->updateMarksBlock(posBlock);
        }
    }

    if (d->m_snippetOverlay->isVisible()) {
        QTextCursor cursor = textCursor();
        cursor.setPosition(position);
        d->snippetCheckCursor(cursor);
    }

    if (doc->isRedoAvailable())
        emit editor()->contentsChangedBecauseOfUndo();

    if (charsAdded != 0 && characterAt(position + charsAdded - 1).isPrint())
        d->m_assistRelevantContentAdded = true;
}

void BaseTextEditorWidget::slotSelectionChanged()
{
    if (d->m_inBlockSelectionMode && !textCursor().hasSelection()) {
        d->m_inBlockSelectionMode = false;
        d->m_blockSelection.clear();
        viewport()->update();
    }

    if (!d->m_selectBlockAnchor.isNull() && !textCursor().hasSelection())
        d->m_selectBlockAnchor = QTextCursor();

    // Clear any link which might be showing when the selection changes
    clearLink();
}

void BaseTextEditorWidget::gotoBlockStart()
{
    QTextCursor cursor = textCursor();
    if (TextBlockUserData::findPreviousOpenParenthesis(&cursor, false)) {
        setTextCursor(cursor);
        _q_matchParentheses();
    }
}

void BaseTextEditorWidget::gotoBlockEnd()
{
    QTextCursor cursor = textCursor();
    if (TextBlockUserData::findNextClosingParenthesis(&cursor, false)) {
        setTextCursor(cursor);
        _q_matchParentheses();
    }
}

void BaseTextEditorWidget::gotoBlockStartWithSelection()
{
    QTextCursor cursor = textCursor();
    if (TextBlockUserData::findPreviousOpenParenthesis(&cursor, true)) {
        setTextCursor(cursor);
        _q_matchParentheses();
    }
}

void BaseTextEditorWidget::gotoBlockEndWithSelection()
{
    QTextCursor cursor = textCursor();
    if (TextBlockUserData::findNextClosingParenthesis(&cursor, true)) {
        setTextCursor(cursor);
        _q_matchParentheses();
    }
}


void BaseTextEditorWidget::gotoLineStart()
{
    handleHomeKey(false);
}

void BaseTextEditorWidget::gotoLineStartWithSelection()
{
    handleHomeKey(true);
}

void BaseTextEditorWidget::gotoLineEnd()
{
    moveCursor(QTextCursor::EndOfLine);
}

void BaseTextEditorWidget::gotoLineEndWithSelection()
{
    moveCursor(QTextCursor::EndOfLine, QTextCursor::KeepAnchor);
}

void BaseTextEditorWidget::gotoNextLine()
{
    moveCursor(QTextCursor::Down);
}

void BaseTextEditorWidget::gotoNextLineWithSelection()
{
    moveCursor(QTextCursor::Down, QTextCursor::KeepAnchor);
}

void BaseTextEditorWidget::gotoPreviousLine()
{
    moveCursor(QTextCursor::Up);
}

void BaseTextEditorWidget::gotoPreviousLineWithSelection()
{
    moveCursor(QTextCursor::Up, QTextCursor::KeepAnchor);
}

void BaseTextEditorWidget::gotoPreviousCharacter()
{
    moveCursor(QTextCursor::PreviousCharacter);
}

void BaseTextEditorWidget::gotoPreviousCharacterWithSelection()
{
    moveCursor(QTextCursor::PreviousCharacter, QTextCursor::KeepAnchor);
}

void BaseTextEditorWidget::gotoNextCharacter()
{
    moveCursor(QTextCursor::NextCharacter);
}

void BaseTextEditorWidget::gotoNextCharacterWithSelection()
{
    moveCursor(QTextCursor::NextCharacter, QTextCursor::KeepAnchor);
}

void BaseTextEditorWidget::gotoPreviousWord()
{
    moveCursor(QTextCursor::PreviousWord);
    setTextCursor(textCursor());
}

void BaseTextEditorWidget::gotoPreviousWordWithSelection()
{
    moveCursor(QTextCursor::PreviousWord, QTextCursor::KeepAnchor);
    setTextCursor(textCursor());
}

void BaseTextEditorWidget::gotoNextWord()
{
    moveCursor(QTextCursor::NextWord);
    setTextCursor(textCursor());
}

void BaseTextEditorWidget::gotoNextWordWithSelection()
{
    moveCursor(QTextCursor::NextWord, QTextCursor::KeepAnchor);
    setTextCursor(textCursor());
}

void BaseTextEditorWidget::gotoPreviousWordCamelCase()
{
    QTextCursor c = textCursor();
    camelCaseLeft(c, QTextCursor::MoveAnchor);
    setTextCursor(c);
}

void BaseTextEditorWidget::gotoPreviousWordCamelCaseWithSelection()
{
    QTextCursor c = textCursor();
    camelCaseLeft(c, QTextCursor::KeepAnchor);
    setTextCursor(c);
}

void BaseTextEditorWidget::gotoNextWordCamelCase()
{
    qDebug() << Q_FUNC_INFO;
    QTextCursor c = textCursor();
    camelCaseRight(c, QTextCursor::MoveAnchor);
    setTextCursor(c);
}

void BaseTextEditorWidget::gotoNextWordCamelCaseWithSelection()
{
    QTextCursor c = textCursor();
    camelCaseRight(c, QTextCursor::KeepAnchor);
    setTextCursor(c);
}



static QTextCursor flippedCursor(const QTextCursor &cursor)
{
    QTextCursor flipped = cursor;
    flipped.clearSelection();
    flipped.setPosition(cursor.anchor(), QTextCursor::KeepAnchor);
    return flipped;
}

bool BaseTextEditorWidget::selectBlockUp()
{
    QTextCursor cursor = textCursor();
    if (!cursor.hasSelection())
        d->m_selectBlockAnchor = cursor;
    else
        cursor.setPosition(cursor.selectionStart());

    if (!TextBlockUserData::findPreviousOpenParenthesis(&cursor, false))
        return false;
    if (!TextBlockUserData::findNextClosingParenthesis(&cursor, true))
        return false;

    setTextCursor(flippedCursor(cursor));
    _q_matchParentheses();
    return true;
}

bool BaseTextEditorWidget::selectBlockDown()
{
    QTextCursor tc = textCursor();
    QTextCursor cursor = d->m_selectBlockAnchor;

    if (!tc.hasSelection() || cursor.isNull())
        return false;
    tc.setPosition(tc.selectionStart());

    forever {
        QTextCursor ahead = cursor;
        if (!TextBlockUserData::findPreviousOpenParenthesis(&ahead, false))
            break;
        if (ahead.position() <= tc.position())
            break;
        cursor = ahead;
    }
    if ( cursor != d->m_selectBlockAnchor)
        TextBlockUserData::findNextClosingParenthesis(&cursor, true);

    setTextCursor(flippedCursor(cursor));
    _q_matchParentheses();
    return true;
}

void BaseTextEditorWidget::copyLineUp()
{
    copyLineUpDown(true);
}

void BaseTextEditorWidget::copyLineDown()
{
    copyLineUpDown(false);
}

// @todo: Potential reuse of some code around the following functions...
void BaseTextEditorWidget::copyLineUpDown(bool up)
{
    QTextCursor cursor = textCursor();
    QTextCursor move = cursor;
    move.beginEditBlock();

    bool hasSelection = cursor.hasSelection();

    if (hasSelection) {
        move.setPosition(cursor.selectionStart());
        move.movePosition(QTextCursor::StartOfBlock);
        move.setPosition(cursor.selectionEnd(), QTextCursor::KeepAnchor);
        move.movePosition(move.atBlockStart() ? QTextCursor::Left: QTextCursor::EndOfBlock,
                          QTextCursor::KeepAnchor);
    } else {
        move.movePosition(QTextCursor::StartOfBlock);
        move.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
    }

    QString text = move.selectedText();

    if (up) {
        move.setPosition(cursor.selectionStart());
        move.movePosition(QTextCursor::StartOfBlock);
        move.insertBlock();
        move.movePosition(QTextCursor::Left);
    } else {
        move.movePosition(QTextCursor::EndOfBlock);
        if (move.atBlockStart()) {
            move.movePosition(QTextCursor::NextBlock);
            move.insertBlock();
            move.movePosition(QTextCursor::Left);
        } else {
            move.insertBlock();
        }
    }

    int start = move.position();
    move.clearSelection();
    move.insertText(text);
    int end = move.position();

    move.setPosition(start);
    move.setPosition(end, QTextCursor::KeepAnchor);

    indent(document(), move, QChar::Null);
    move.endEditBlock();

    setTextCursor(move);
}

void BaseTextEditorWidget::joinLines()
{
    QTextCursor cursor = textCursor();
    QTextCursor start = cursor;
    QTextCursor end = cursor;

    start.setPosition(cursor.selectionStart());
    end.setPosition(cursor.selectionEnd() - 1);

    int lineCount = qMax(1, end.blockNumber() - start.blockNumber());

    cursor.beginEditBlock();
    cursor.setPosition(cursor.selectionStart());
    while (lineCount--) {
        cursor.movePosition(QTextCursor::NextBlock);
        cursor.movePosition(QTextCursor::StartOfBlock);
        cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
        QString cutLine = cursor.selectedText();

        // Collapse leading whitespaces to one or insert whitespace
        cutLine.replace(QRegExp(QLatin1String("^\\s*")), QLatin1String(" "));
        cursor.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor);
        cursor.removeSelectedText();

        cursor.movePosition(QTextCursor::PreviousBlock);
        cursor.movePosition(QTextCursor::EndOfBlock);

        cursor.insertText(cutLine);
    }
    cursor.endEditBlock();

    setTextCursor(cursor);
}

void BaseTextEditorWidget::insertLineAbove()
{
    QTextCursor cursor = textCursor();
    cursor.beginEditBlock();
    cursor.movePosition(QTextCursor::PreviousBlock, QTextCursor::MoveAnchor);
    cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::MoveAnchor);
    cursor.insertBlock();
    indent(document(), cursor, QChar::Null);
    cursor.endEditBlock();
    setTextCursor(cursor);
}

void BaseTextEditorWidget::insertLineBelow()
{
    QTextCursor cursor = textCursor();
    cursor.beginEditBlock();
    cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::MoveAnchor);
    cursor.insertBlock();
    indent(document(), cursor, QChar::Null);
    cursor.endEditBlock();
    setTextCursor(cursor);
}

void BaseTextEditorWidget::moveLineUp()
{
    moveLineUpDown(true);
}

void BaseTextEditorWidget::moveLineDown()
{
    moveLineUpDown(false);
}

void BaseTextEditorWidget::uppercaseSelection()
{
    transformSelection(&QString::toUpper);
}


void BaseTextEditorWidget::lowercaseSelection()
{
    transformSelection(&QString::toLower);
}

void BaseTextEditorWidget::indent()
{
    indentOrUnindent(true);
}

void BaseTextEditorWidget::unindent()
{
    indentOrUnindent(false);
}

void BaseTextEditorWidget::moveLineUpDown(bool up)
{
    QTextCursor cursor = textCursor();
    QTextCursor move = cursor;

    move.setVisualNavigation(false); // this opens folded items instead of destroying them

    if (d->m_moveLineUndoHack)
        move.joinPreviousEditBlock();
    else
        move.beginEditBlock();

    bool hasSelection = cursor.hasSelection();

    if (cursor.hasSelection()) {
        move.setPosition(cursor.selectionStart());
        move.movePosition(QTextCursor::StartOfBlock);
        move.setPosition(cursor.selectionEnd(), QTextCursor::KeepAnchor);
        move.movePosition(move.atBlockStart() ? QTextCursor::Left: QTextCursor::EndOfBlock,
                          QTextCursor::KeepAnchor);
    } else {
        move.movePosition(QTextCursor::StartOfBlock);
        move.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
    }
    QString text = move.selectedText();

    RefactorMarkers affectedMarkers;
    RefactorMarkers nonAffectedMarkers;
    QList<int> markerOffsets;

    foreach (const RefactorMarker &marker, d->m_refactorOverlay->markers()) {
        //test if marker is part of the selection to be moved
        if ((move.selectionStart() <= marker.cursor.position())
                && (move.selectionEnd() >= marker.cursor.position())) {
            affectedMarkers.append(marker);
            //remember the offset of markers in text
            int offset = marker.cursor.position() - move.selectionStart();
            markerOffsets.append(offset);
        } else {
            nonAffectedMarkers.append(marker);
        }
    }

    move.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor);
    move.removeSelectedText();

    if (up) {
        move.movePosition(QTextCursor::PreviousBlock);
        move.insertBlock();
        move.movePosition(QTextCursor::Left);
    } else {
        move.movePosition(QTextCursor::EndOfBlock);
        if (move.atBlockStart()) { // empty block
            move.movePosition(QTextCursor::NextBlock);
            move.insertBlock();
            move.movePosition(QTextCursor::Left);
        } else {
            move.insertBlock();
        }
    }

    int start = move.position();
    move.clearSelection();
    move.insertText(text);
    int end = move.position();

    if (hasSelection) {
        move.setPosition(start);
        move.setPosition(end, QTextCursor::KeepAnchor);
    }

    //update positions of affectedMarkers
    for (int i=0;i < affectedMarkers.count(); i++) {
        int newPosition = start + markerOffsets.at(i);
        affectedMarkers[i].cursor.setPosition(newPosition);
    }
    d->m_refactorOverlay->setMarkers(nonAffectedMarkers + affectedMarkers);

    reindent(document(), move);
    move.endEditBlock();

    setTextCursor(move);
    d->m_moveLineUndoHack = true;
}

void BaseTextEditorWidget::cleanWhitespace()
{
    d->m_document->cleanWhitespace(textCursor());
}


// could go into QTextCursor...
static QTextLine currentTextLine(const QTextCursor &cursor)
{
    const QTextBlock block = cursor.block();
    if (!block.isValid())
        return QTextLine();

    const QTextLayout *layout = block.layout();
    if (!layout)
        return QTextLine();

    const int relativePos = cursor.position() - block.position();
    return layout->lineForTextPosition(relativePos);
}

bool BaseTextEditorWidget::camelCaseLeft(QTextCursor &cursor, QTextCursor::MoveMode mode)
{
    int state = 0;
    enum Input {
        Input_U,
        Input_l,
        Input_underscore,
        Input_space,
        Input_other
    };

    if (!cursor.movePosition(QTextCursor::Left, mode))
        return false;

    forever {
        QChar c = characterAt(cursor.position());
        Input input = Input_other;
        if (c.isUpper())
            input = Input_U;
        else if (c.isLower() || c.isDigit())
            input = Input_l;
        else if (c == QLatin1Char('_'))
            input = Input_underscore;
        else if (c.isSpace() && c != QChar::ParagraphSeparator)
            input = Input_space;
        else
            input = Input_other;

        switch (state) {
        case 0:
            switch (input) {
            case Input_U:
                state = 1;
                break;
            case Input_l:
                state = 2;
                break;
            case Input_underscore:
                state = 3;
                break;
            case Input_space:
                state = 4;
                break;
            default:
                cursor.movePosition(QTextCursor::Right, mode);
                return cursor.movePosition(QTextCursor::WordLeft, mode);
            }
            break;
        case 1:
            switch (input) {
            case Input_U:
                break;
            default:
                cursor.movePosition(QTextCursor::Right, mode);
                return true;
            }
            break;

        case 2:
            switch (input) {
            case Input_U:
                return true;
            case Input_l:
                break;
            default:
                cursor.movePosition(QTextCursor::Right, mode);
                return true;
            }
            break;
        case 3:
            switch (input) {
            case Input_underscore:
                break;
            case Input_U:
                state = 1;
                break;
            case Input_l:
                state = 2;
                break;
            default:
                cursor.movePosition(QTextCursor::Right, mode);
                return true;
            }
            break;
        case 4:
            switch (input) {
            case Input_space:
                break;
            case Input_U:
                state = 1;
                break;
            case Input_l:
                state = 2;
                break;
            case Input_underscore:
                state = 3;
                break;
            default:
                cursor.movePosition(QTextCursor::Right, mode);
                if (cursor.positionInBlock() == 0)
                    return true;
                return cursor.movePosition(QTextCursor::WordLeft, mode);
            }
        }

        if (!cursor.movePosition(QTextCursor::Left, mode))
            return true;
    }
}

bool BaseTextEditorWidget::camelCaseRight(QTextCursor &cursor, QTextCursor::MoveMode mode)
{
    int state = 0;
    enum Input {
        Input_U,
        Input_l,
        Input_underscore,
        Input_space,
        Input_other
    };

    forever {
        QChar c = characterAt(cursor.position());
        Input input = Input_other;
        if (c.isUpper())
            input = Input_U;
        else if (c.isLower() || c.isDigit())
            input = Input_l;
        else if (c == QLatin1Char('_'))
            input = Input_underscore;
        else if (c.isSpace() && c != QChar::ParagraphSeparator)
            input = Input_space;
        else
            input = Input_other;

        switch (state) {
        case 0:
            switch (input) {
            case Input_U:
                state = 4;
                break;
            case Input_l:
                state = 1;
                break;
            case Input_underscore:
                state = 6;
                break;
            default:
                return cursor.movePosition(QTextCursor::WordRight, mode);
            }
            break;
        case 1:
            switch (input) {
            case Input_U:
                return true;
            case Input_l:
                break;
            case Input_underscore:
                state = 6;
                break;
            case Input_space:
                state = 7;
                break;
            default:
                return true;
            }
            break;
        case 2:
            switch (input) {
            case Input_U:
                break;
            case Input_l:
                cursor.movePosition(QTextCursor::Left, mode);
                return true;
            case Input_underscore:
                state = 6;
                break;
            case Input_space:
                state = 7;
                break;
            default:
                return true;
            }
            break;
        case 4:
            switch (input) {
            case Input_U:
                state = 2;
                break;
            case Input_l:
                state = 1;
                break;
            case Input_underscore:
                state = 6;
                break;
            case Input_space:
                state = 7;
                break;
            default:
                return true;
            }
            break;
        case 6:
            switch (input) {
            case Input_underscore:
                break;
            case Input_space:
                state = 7;
                break;
            default:
                return true;
            }
            break;
        case 7:
            switch (input) {
            case Input_space:
                break;
            default:
                return true;
            }
            break;
        }
        cursor.movePosition(QTextCursor::Right, mode);
    }
}

bool BaseTextEditorWidget::cursorMoveKeyEvent(QKeyEvent *e)
{
    QTextCursor cursor = textCursor();

    QTextCursor::MoveMode mode = QTextCursor::MoveAnchor;
    QTextCursor::MoveOperation op = QTextCursor::NoMove;

    if (e == QKeySequence::MoveToNextChar) {
            op = QTextCursor::Right;
    }
    else if (e == QKeySequence::MoveToPreviousChar) {
            op = QTextCursor::Left;
    }
    else if (e == QKeySequence::SelectNextChar) {
           op = QTextCursor::Right;
           mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectPreviousChar) {
            op = QTextCursor::Left;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectNextWord) {
            op = QTextCursor::WordRight;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectPreviousWord) {
            op = QTextCursor::WordLeft;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectStartOfLine) {
            op = QTextCursor::StartOfLine;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectEndOfLine) {
            op = QTextCursor::EndOfLine;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectStartOfBlock) {
            op = QTextCursor::StartOfBlock;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectEndOfBlock) {
            op = QTextCursor::EndOfBlock;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectStartOfDocument) {
            op = QTextCursor::Start;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectEndOfDocument) {
            op = QTextCursor::End;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectPreviousLine) {
            op = QTextCursor::Up;
            mode = QTextCursor::KeepAnchor;
    }
    else if (e == QKeySequence::SelectNextLine) {
            op = QTextCursor::Down;
            mode = QTextCursor::KeepAnchor;
            {
                QTextBlock block = cursor.block();
                QTextLine line = currentTextLine(cursor);
                if (!block.next().isValid()
                    && line.isValid()
                    && line.lineNumber() == block.layout()->lineCount() - 1)
                    op = QTextCursor::End;
            }
    }
    else if (e == QKeySequence::MoveToNextWord) {
            op = QTextCursor::WordRight;
    }
    else if (e == QKeySequence::MoveToPreviousWord) {
            op = QTextCursor::WordLeft;
    }
    else if (e == QKeySequence::MoveToEndOfBlock) {
            op = QTextCursor::EndOfBlock;
    }
    else if (e == QKeySequence::MoveToStartOfBlock) {
            op = QTextCursor::StartOfBlock;
    }
    else if (e == QKeySequence::MoveToNextLine) {
            op = QTextCursor::Down;
    }
    else if (e == QKeySequence::MoveToPreviousLine) {
            op = QTextCursor::Up;
    }
    else if (e == QKeySequence::MoveToPreviousLine) {
            op = QTextCursor::Up;
    }
    else if (e == QKeySequence::MoveToStartOfLine) {
            op = QTextCursor::StartOfLine;
    }
    else if (e == QKeySequence::MoveToEndOfLine) {
            op = QTextCursor::EndOfLine;
    }
    else if (e == QKeySequence::MoveToStartOfDocument) {
            op = QTextCursor::Start;
    }
    else if (e == QKeySequence::MoveToEndOfDocument) {
            op = QTextCursor::End;
    }
    else {
        return false;
    }


// Except for pageup and pagedown, Mac OS X has very different behavior, we don't do it all, but
// here's the breakdown:
// Shift still works as an anchor, but only one of the other keys can be down Ctrl (Command),
// Alt (Option), or Meta (Control).
// Command/Control + Left/Right -- Move to left or right of the line
//                 + Up/Down -- Move to top bottom of the file. (Control doesn't move the cursor)
// Option + Left/Right -- Move one word Left/right.
//        + Up/Down  -- Begin/End of Paragraph.
// Home/End Top/Bottom of file. (usually don't move the cursor, but will select)

    bool visualNavigation = cursor.visualNavigation();
    cursor.setVisualNavigation(true);

    if (camelCaseNavigationEnabled() && op == QTextCursor::WordRight) {
        camelCaseRight(cursor, mode);
    } else if (camelCaseNavigationEnabled() && op == QTextCursor::WordLeft) {
        camelCaseLeft(cursor, mode);
    } else if (!cursor.movePosition(op, mode) && mode == QTextCursor::MoveAnchor) {
        cursor.clearSelection();
    }
    cursor.setVisualNavigation(visualNavigation);

    setTextCursor(cursor);
    ensureCursorVisible();
    return true;
}


void BaseTextEditorWidget::keyPressEvent(QKeyEvent *e)
{
    viewport()->setCursor(Qt::BlankCursor);
    ToolTip::instance()->hide();

    d->m_moveLineUndoHack = false;
    d->clearVisibleFoldedBlock();

    if (d->m_isCirculatingClipboard
            && !isModifierKey(e->key())) {
        d->m_isCirculatingClipboard = false;
    }

    if (e->key() == Qt::Key_Alt
            && d->m_behaviorSettings.m_keyboardTooltips) {
        d->m_maybeFakeTooltipEvent = true;
    } else {
        d->m_maybeFakeTooltipEvent = false;
        if (e->key() == Qt::Key_Escape
                && d->m_snippetOverlay->isVisible()) {
            e->accept();
            d->m_snippetOverlay->hide();
            d->m_snippetOverlay->clear();
            QTextCursor cursor = textCursor();
            cursor.clearSelection();
            setTextCursor(cursor);
            return;
        }
    }

    bool ro = isReadOnly();
    const bool inOverwriteMode = overwriteMode();

    if (d->m_inBlockSelectionMode) {
        if (e == QKeySequence::Cut) {
            if (!ro) {
                cut();
                e->accept();
                return;
            }
        } else if (e == QKeySequence::Delete || e->key() == Qt::Key_Backspace) {
            if (!ro) {
                d->removeBlockSelection();
                e->accept();
                return;
            }
        } else if (e == QKeySequence::Paste) {
            if (!ro) {
                d->removeBlockSelection();
                // continue
            }
        }
    }


    if (!ro
        && (e == QKeySequence::InsertParagraphSeparator
            || (!d->m_lineSeparatorsAllowed && e == QKeySequence::InsertLineSeparator))) {
        if (d->m_snippetOverlay->isVisible()) {
            e->accept();
            d->m_snippetOverlay->hide();
            d->m_snippetOverlay->clear();
            QTextCursor cursor = textCursor();
            cursor.movePosition(QTextCursor::EndOfBlock);
            setTextCursor(cursor);
            return;
        }

        QTextCursor cursor = textCursor();
        if (d->m_inBlockSelectionMode)
            cursor.clearSelection();
        const TabSettings &ts = d->m_document->tabSettings();
        const TypingSettings &tps = d->m_document->typingSettings();
        cursor.beginEditBlock();

        int extraBlocks =
            d->m_autoCompleter->paragraphSeparatorAboutToBeInserted(cursor, tabSettings());

        QString previousIndentationString;
        if (tps.m_autoIndent) {
            cursor.insertBlock();
            indent(document(), cursor, QChar::Null);
        } else {
            cursor.insertBlock();

            // After inserting the block, to avoid duplicating whitespace on the same line
            const QString &previousBlockText = cursor.block().previous().text();
            previousIndentationString = ts.indentationString(previousBlockText);
            if (!previousIndentationString.isEmpty())
                cursor.insertText(previousIndentationString);
        }
        cursor.endEditBlock();
        e->accept();

        if (extraBlocks > 0) {
            QTextCursor ensureVisible = cursor;
            while (extraBlocks > 0) {
                --extraBlocks;
                ensureVisible.movePosition(QTextCursor::NextBlock);
                if (tps.m_autoIndent)
                    indent(document(), ensureVisible, QChar::Null);
                else if (!previousIndentationString.isEmpty())
                    ensureVisible.insertText(previousIndentationString);
            }
            setTextCursor(ensureVisible);
        }

        setTextCursor(cursor);
        return;
    } else if (!ro
               && (e == QKeySequence::MoveToStartOfBlock
                   || e == QKeySequence::SelectStartOfBlock)){
        if ((e->modifiers() & (Qt::AltModifier | Qt::ShiftModifier)) == (Qt::AltModifier | Qt::ShiftModifier)) {
            e->accept();
            return;
        }
        handleHomeKey(e == QKeySequence::SelectStartOfBlock);
        e->accept();
        return;
    } else if (!ro
               && (e == QKeySequence::MoveToStartOfLine
                   || e == QKeySequence::SelectStartOfLine)){
        if ((e->modifiers() & (Qt::AltModifier | Qt::ShiftModifier)) == (Qt::AltModifier | Qt::ShiftModifier)) {
                e->accept();
                return;
        }
        QTextCursor cursor = textCursor();
        if (QTextLayout *layout = cursor.block().layout()) {
            if (layout->lineForTextPosition(cursor.position() - cursor.block().position()).lineNumber() == 0) {
                handleHomeKey(e == QKeySequence::SelectStartOfLine);
                e->accept();
                return;
            }
        }
    } else if (!ro
               && e == QKeySequence::DeleteStartOfWord
               && d->m_document->typingSettings().m_autoIndent
               && !textCursor().hasSelection()){
        e->accept();
        QTextCursor c = textCursor();
        int pos = c.position();
        if (camelCaseNavigationEnabled())
            camelCaseLeft(c, QTextCursor::MoveAnchor);
        else
            c.movePosition(QTextCursor::StartOfWord, QTextCursor::MoveAnchor);
        int targetpos = c.position();
        forever {
            handleBackspaceKey();
            int cpos = textCursor().position();
            if (cpos == pos || cpos <= targetpos)
                break;
            pos = cpos;
        }
        return;
    } else if (!ro && e == QKeySequence::DeleteStartOfWord && !textCursor().hasSelection()) {
        e->accept();
        QTextCursor c = textCursor();
        if (camelCaseNavigationEnabled())
            camelCaseLeft(c, QTextCursor::KeepAnchor);
        else
            c.movePosition(QTextCursor::StartOfWord, QTextCursor::KeepAnchor);
        c.removeSelectedText();
        return;
    } else if (!ro && e == QKeySequence::DeleteEndOfWord && !textCursor().hasSelection()) {
        e->accept();
        QTextCursor c = textCursor();
        if (camelCaseNavigationEnabled())
            camelCaseRight(c, QTextCursor::KeepAnchor);
        else
            c.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
        c.removeSelectedText();
        return;
    } else switch (e->key()) {


#if 0
    case Qt::Key_Dollar: {
            d->m_overlay->setVisible(!d->m_overlay->isVisible());
            d->m_overlay->setCursor(textCursor());
            e->accept();
        return;

    } break;
#endif
    case Qt::Key_Tab:
    case Qt::Key_Backtab: {
        if (ro) break;
        if (d->m_snippetOverlay->isVisible() && !d->m_snippetOverlay->isEmpty()) {
            d->snippetTabOrBacktab(e->key() == Qt::Key_Tab);
            e->accept();
            return;
        }
        QTextCursor cursor = textCursor();
        int newPosition;
        if (d->m_document->typingSettings().tabShouldIndent(document(), cursor, &newPosition)) {
            if (newPosition != cursor.position() && !cursor.hasSelection()) {
                cursor.setPosition(newPosition);
                setTextCursor(cursor);
            }
            indent(document(), cursor, QChar::Null);
        } else {
            indentOrUnindent(e->key() == Qt::Key_Tab);
        }
        e->accept();
        return;
    } break;
    case Qt::Key_Backspace:
        if (ro) break;
        if ((e->modifiers() & (Qt::ControlModifier
                               | Qt::ShiftModifier
                               | Qt::AltModifier
                               | Qt::MetaModifier)) == Qt::NoModifier
            && !textCursor().hasSelection()) {
            handleBackspaceKey();
            e->accept();
            return;
        }
        break;
    case Qt::Key_Up:
    case Qt::Key_Down:
        if (e->modifiers() & Qt::ControlModifier) {
            verticalScrollBar()->triggerAction(
                    e->key() == Qt::Key_Up ? QAbstractSlider::SliderSingleStepSub :
                                             QAbstractSlider::SliderSingleStepAdd);
            e->accept();
            return;
        }
        // fall through
    case Qt::Key_Right:
    case Qt::Key_Left:
#ifndef Q_OS_MAC
        if ((e->modifiers()
             & (Qt::AltModifier | Qt::ShiftModifier)) == (Qt::AltModifier | Qt::ShiftModifier)) {
            int diff_row = 0;
            int diff_col = 0;
            if (e->key() == Qt::Key_Up)
                diff_row = -1;
            else if (e->key() == Qt::Key_Down)
                diff_row = 1;
            else if (e->key() == Qt::Key_Left)
                diff_col = -1;
            else if (e->key() == Qt::Key_Right)
                diff_col = 1;
            handleBlockSelection(diff_row, diff_col);
            e->accept();
            return;
        } else {
            // leave block selection mode
            if (d->m_inBlockSelectionMode) {
                d->m_inBlockSelectionMode = false;
                d->m_blockSelection.clear();
                viewport()->update();
            }
        }
#endif
        break;
    case Qt::Key_PageUp:
    case Qt::Key_PageDown:
        if (e->modifiers() == Qt::ControlModifier) {
            verticalScrollBar()->triggerAction(
                    e->key() == Qt::Key_PageUp ? QAbstractSlider::SliderPageStepSub :
                                                 QAbstractSlider::SliderPageStepAdd);
            e->accept();
            return;
        }
        break;
    case Qt::Key_Insert:
        if (ro) break;
        if (e->modifiers() == Qt::NoModifier) {
            if (inOverwriteMode) {
                d->m_autoCompleter->setAutoParenthesesEnabled(d->autoParenthesisOverwriteBackup);
                d->m_autoCompleter->setSurroundWithEnabled(d->surroundWithEnabledOverwriteBackup);
                setOverwriteMode(false);
            } else {
                d->autoParenthesisOverwriteBackup = d->m_autoCompleter->isAutoParenthesesEnabled();
                d->surroundWithEnabledOverwriteBackup = d->m_autoCompleter->isSurroundWithEnabled();
                d->m_autoCompleter->setAutoParenthesesEnabled(false);
                d->m_autoCompleter->setSurroundWithEnabled(false);
                setOverwriteMode(true);
            }
            e->accept();
            return;
        }
        break;

    default:
        break;
    }

    if (!ro && d->m_inBlockSelectionMode) {
        QString text = e->text();
        if (!text.isEmpty() && (text.at(0).isPrint() || text.at(0) == QLatin1Char('\t'))) {
            d->removeBlockSelection(text);
            goto skip_event;
        }
    }

    if (e->key() == Qt::Key_H && e->modifiers() ==
#ifdef Q_OS_DARWIN
        Qt::MetaModifier
#else
        Qt::ControlModifier
#endif
        ) {
        universalHelper();
        e->accept();
        return;
    }

    if (ro || e->text().isEmpty() || !e->text().at(0).isPrint()) {
        if (cursorMoveKeyEvent(e))
            ;
        else {
            QTextCursor cursor = textCursor();
            bool cursorWithinSnippet = false;
            if (d->m_snippetOverlay->isVisible()
                && (e->key() == Qt::Key_Delete || e->key() == Qt::Key_Backspace)) {
                cursorWithinSnippet = d->snippetCheckCursor(cursor);
            }
            if (cursorWithinSnippet)
                cursor.beginEditBlock();

            QPlainTextEdit::keyPressEvent(e);

            if (cursorWithinSnippet) {
                cursor.endEditBlock();
                d->m_snippetOverlay->updateEquivalentSelections(textCursor());
            }
        }
    } else if ((e->modifiers() & (Qt::ControlModifier|Qt::AltModifier)) != Qt::ControlModifier){
        QTextCursor cursor = textCursor();
        QString text = e->text();
        const QString &autoText = d->m_autoCompleter->autoComplete(cursor, text);

        QChar electricChar;
        if (d->m_document->typingSettings().m_autoIndent) {
            foreach (QChar c, text) {
                if (d->m_indenter->isElectricCharacter(c)) {
                    electricChar = c;
                    break;
                }
            }
        }

        bool cursorWithinSnippet = false;
        if (d->m_snippetOverlay->isVisible())
            cursorWithinSnippet = d->snippetCheckCursor(cursor);

        bool doEditBlock = !electricChar.isNull() || !autoText.isEmpty() || cursorWithinSnippet;
        if (doEditBlock)
            cursor.beginEditBlock();

        if (inOverwriteMode) {
            if (!doEditBlock)
                cursor.beginEditBlock();
            QTextBlock block = cursor.block();
            int eolPos = block.position() + block.length() - 1;
            int selEndPos = qMin(cursor.position() + text.length(), eolPos);
            cursor.setPosition(selEndPos, QTextCursor::KeepAnchor);
            cursor.insertText(text);
            if (!doEditBlock)
                cursor.endEditBlock();
        } else {
            cursor.insertText(text);
        }

        if (!autoText.isEmpty()) {
            int pos = cursor.position();
            cursor.insertText(autoText);
            //Select the inserted text, to be able to re-indent the inserted text
            cursor.setPosition(pos, QTextCursor::KeepAnchor);
        }
        if (!electricChar.isNull() && d->m_autoCompleter->contextAllowsElectricCharacters(cursor))
            indent(document(), cursor, electricChar);
        if (!autoText.isEmpty()) {
            if (d->m_document->typingSettings().m_autoIndent)
                reindent(document(), cursor);
            cursor.setPosition(autoText.length() == 1 ? cursor.position() : cursor.anchor());
        }

        if (doEditBlock) {
            cursor.endEditBlock();
            if (cursorWithinSnippet)
                d->m_snippetOverlay->updateEquivalentSelections(textCursor());
        }

        setTextCursor(cursor);
    }

    skip_event:
    if (!ro && e->key() == Qt::Key_Delete && d->m_parenthesesMatchingEnabled)
        d->m_parenthesesMatchingTimer->start(50);

    if (!ro && d->m_contentsChanged && !e->text().isEmpty()
            && e->text().at(0).isPrint() && !inOverwriteMode) {
        d->m_codeAssistant->process();
    }
}

void BaseTextEditorWidget::insertCodeSnippet(const QTextCursor &cursor_arg, const QString &snippet)
{
    if ((snippet.count(Snippet::kVariableDelimiter) % 2) != 0) {
        qWarning() << "invalid snippet";
        return;
    }

    QList<QTextEdit::ExtraSelection> selections;

    QTextCursor cursor = cursor_arg;
    cursor.beginEditBlock();
    cursor.removeSelectedText();
    const int startCursorPosition = cursor.position();

    int pos = 0;
    QMap<int, int> positions;

    while (pos < snippet.size()) {
        if (snippet.at(pos) != Snippet::kVariableDelimiter) {
            const int start = pos;
            do { ++pos; }
            while (pos < snippet.size() && snippet.at(pos) != Snippet::kVariableDelimiter);
            cursor.insertText(snippet.mid(start, pos - start));
        } else {
            // the start of a place holder.
            const int start = ++pos;
            for (; pos < snippet.size(); ++pos) {
                if (snippet.at(pos) == Snippet::kVariableDelimiter)
                    break;
            }

            Q_ASSERT(pos < snippet.size());
            Q_ASSERT(snippet.at(pos) == Snippet::kVariableDelimiter);

            const QString textToInsert = snippet.mid(start, pos - start);

            int cursorPosition = cursor.position();
            cursor.insertText(textToInsert);

            if (textToInsert.isEmpty()) {
                positions.insert(cursorPosition, 0);
            } else {
                positions.insert(cursorPosition, textToInsert.length());
            }

            ++pos;
        }
    }

    QMapIterator<int,int> it(positions);
    while (it.hasNext()) {
        it.next();
        int length = it.value();
        int position = it.key();

        QTextCursor tc(document());
        tc.setPosition(position);
        tc.setPosition(position + length, QTextCursor::KeepAnchor);
        QTextEdit::ExtraSelection selection;
        selection.cursor = tc;
        selection.format = (length ? d->m_occurrencesFormat : d->m_occurrenceRenameFormat);
        selections.append(selection);
    }

    cursor.setPosition(startCursorPosition, QTextCursor::KeepAnchor);
    indent(cursor.document(), cursor, QChar());
    cursor.endEditBlock();

    setExtraSelections(BaseTextEditorWidget::SnippetPlaceholderSelection, selections);

    if (! selections.isEmpty()) {
        const QTextEdit::ExtraSelection &selection = selections.first();

        cursor = textCursor();
        if (selection.cursor.hasSelection()) {
            cursor.setPosition(selection.cursor.selectionStart());
            cursor.setPosition(selection.cursor.selectionEnd(), QTextCursor::KeepAnchor);
        } else {
            cursor.setPosition(selection.cursor.position());
        }
        setTextCursor(cursor);
    }

}

void BaseTextEditorWidget::universalHelper()
{
    // Test function for development. Place your new fangled experiment here to
    // give it proper scrutiny before pushing it onto others.
}

void BaseTextEditorWidget::setTextCursor(const QTextCursor &cursor)
{
    // workaround for QTextControl bug
    bool selectionChange = cursor.hasSelection() || textCursor().hasSelection();
    QTextCursor c = cursor;
    c.setVisualNavigation(true);
    QPlainTextEdit::setTextCursor(c);
    if (selectionChange)
        slotSelectionChanged();
}

void BaseTextEditorWidget::gotoLine(int line, int column)
{
    d->m_lastCursorChangeWasInteresting = false; // avoid adding the previous position to history
    const int blockNumber = line - 1;
    const QTextBlock &block = document()->findBlockByNumber(blockNumber);
    if (block.isValid()) {
        QTextCursor cursor(block);
        if (column > 0) {
            cursor.movePosition(QTextCursor::Right, QTextCursor::MoveAnchor, column);
        } else {
            int pos = cursor.position();
            while (characterAt(pos).category() == QChar::Separator_Space) {
                ++pos;
            }
            cursor.setPosition(pos);
        }
        setTextCursor(cursor);
        centerCursor();
    }
    saveCurrentCursorPositionForNavigation();
}

int BaseTextEditorWidget::position(ITextEditor::PositionOperation posOp, int at) const
{
    QTextCursor tc = textCursor();

    if (at != -1)
        tc.setPosition(at);

    if (posOp == ITextEditor::Current)
        return tc.position();

    switch (posOp) {
    case ITextEditor::EndOfLine:
        tc.movePosition(QTextCursor::EndOfLine);
        return tc.position();
    case ITextEditor::StartOfLine:
        tc.movePosition(QTextCursor::StartOfLine);
        return tc.position();
    case ITextEditor::Anchor:
        if (tc.hasSelection())
            return tc.anchor();
        break;
    case ITextEditor::EndOfDoc:
        tc.movePosition(QTextCursor::End);
        return tc.position();
    default:
        break;
    }

    return -1;
}

void BaseTextEditorWidget::convertPosition(int pos, int *line, int *column) const
{
    Convenience::convertPosition(document(), pos, line, column);
}

QChar BaseTextEditorWidget::characterAt(int pos) const
{
    return document()->characterAt(pos);
}

bool BaseTextEditorWidget::event(QEvent *e)
{
    d->m_contentsChanged = false;
    switch (e->type()) {
    case QEvent::ShortcutOverride:
        if (static_cast<QKeyEvent*>(e)->key() == Qt::Key_Escape && d->m_snippetOverlay->isVisible()) {
            e->accept();
            return true;
        }
        e->ignore(); // we are a really nice citizen
        return true;
        break;
    default:
        break;
    }

    return QPlainTextEdit::event(e);
}

void BaseTextEditorWidget::duplicateFrom(BaseTextEditorWidget *widget)
{
    if (this == widget)
        return;
    setDisplayName(widget->displayName());
    d->m_revisionsVisible = widget->d->m_revisionsVisible;
    if (d->m_document == widget->d->m_document)
        return;
    d->setupDocumentSignals(widget->d->m_document);
    d->m_document = widget->d->m_document;
}

QString BaseTextEditorWidget::displayName() const
{
    return d->m_displayName;
}

void BaseTextEditorWidget::setDisplayName(const QString &title)
{
    d->m_displayName = title;
    emit changed();
}

BaseTextDocument *BaseTextEditorWidget::baseTextDocument() const
{
    return d->m_document;
}


void BaseTextEditorWidget::setBaseTextDocument(BaseTextDocument *doc)
{
    if (doc) {
        d->setupDocumentSignals(doc);
        d->m_document = doc;
    }
}

void BaseTextEditorWidget::documentAboutToBeReloaded()
{
    //memorize cursor position
    d->m_tempState = saveState();

    // remove extra selections (loads of QTextCursor objects)

    for (int i = 0; i < NExtraSelectionKinds; ++i)
        d->m_extraSelections[i].clear();
    QPlainTextEdit::setExtraSelections(QList<QTextEdit::ExtraSelection>());

    // clear all overlays
    d->m_overlay->clear();
    d->m_snippetOverlay->clear();
    d->m_searchResultOverlay->clear();
    d->m_refactorOverlay->clear();
}

void BaseTextEditorWidget::documentReloaded()
{
    // restore cursor position
    restoreState(d->m_tempState);
    updateCannotDecodeInfo();
}

QByteArray BaseTextEditorWidget::saveState() const
{
    QByteArray state;
    QDataStream stream(&state, QIODevice::WriteOnly);
    stream << 1; // version number
    stream << verticalScrollBar()->value();
    stream << horizontalScrollBar()->value();
    int line, column;
    convertPosition(textCursor().position(), &line, &column);
    stream << line;
    stream << column;

    // store code folding state
    QList<int> foldedBlocks;
    QTextBlock block = document()->firstBlock();
    while (block.isValid()) {
        if (block.userData() && static_cast<TextBlockUserData*>(block.userData())->folded()) {
            int number = block.blockNumber();
            foldedBlocks += number;
        }
        block = block.next();
    }
    stream << foldedBlocks;

    return state;
}

bool BaseTextEditorWidget::restoreState(const QByteArray &state)
{
    if (state.isEmpty()) {
        if (d->m_displaySettings.m_autoFoldFirstComment)
            d->foldLicenseHeader();
        return false;
    }
    int version;
    int vval;
    int hval;
    int lval;
    int cval;
    QDataStream stream(state);
    stream >> version;
    stream >> vval;
    stream >> hval;
    stream >> lval;
    stream >> cval;

    if (version >= 1) {
        QList<int> collapsedBlocks;
        stream >> collapsedBlocks;
        QTextDocument *doc = document();
        bool layoutChanged = false;
        foreach(int blockNumber, collapsedBlocks) {
            QTextBlock block = doc->findBlockByNumber(qMax(0, blockNumber));
            if (block.isValid()) {
                BaseTextDocumentLayout::doFoldOrUnfold(block, false);
                layoutChanged = true;
            }
        }
        if (layoutChanged) {
            BaseTextDocumentLayout *documentLayout =
                    qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
            QTC_ASSERT(documentLayout, return false);
            documentLayout->requestUpdate();
            documentLayout->emitDocumentSizeChanged();
        }
    } else {
        if (d->m_displaySettings.m_autoFoldFirstComment)
            d->foldLicenseHeader();
    }

    d->m_lastCursorChangeWasInteresting = false; // avoid adding last position to history
    gotoLine(lval, cval);
    verticalScrollBar()->setValue(vval);
    horizontalScrollBar()->setValue(hval);
    saveCurrentCursorPositionForNavigation();
    return true;
}

void BaseTextEditorWidget::setDefaultPath(const QString &defaultPath)
{
    baseTextDocument()->setDefaultPath(defaultPath);
}

void BaseTextEditorWidget::setSuggestedFileName(const QString &suggestedFileName)
{
    baseTextDocument()->setSuggestedFileName(suggestedFileName);
}

void BaseTextEditorWidget::setParenthesesMatchingEnabled(bool b)
{
    d->m_parenthesesMatchingEnabled = b;
}

bool BaseTextEditorWidget::isParenthesesMatchingEnabled() const
{
    return d->m_parenthesesMatchingEnabled;
}

void BaseTextEditorWidget::setHighlightCurrentLine(bool b)
{
    d->m_highlightCurrentLine = b;
    updateCurrentLineHighlight();
}

bool BaseTextEditorWidget::highlightCurrentLine() const
{
    return d->m_highlightCurrentLine;
}

void BaseTextEditorWidget::setLineNumbersVisible(bool b)
{
    d->m_lineNumbersVisible = b;
    slotUpdateExtraAreaWidth();
}

bool BaseTextEditorWidget::lineNumbersVisible() const
{
    return d->m_lineNumbersVisible;
}

void BaseTextEditorWidget::setMarksVisible(bool b)
{
    d->m_marksVisible = b;
    slotUpdateExtraAreaWidth();
}

bool BaseTextEditorWidget::marksVisible() const
{
    return d->m_marksVisible;
}

void BaseTextEditorWidget::setRequestMarkEnabled(bool b)
{
    d->m_requestMarkEnabled = b;
}

bool BaseTextEditorWidget::requestMarkEnabled() const
{
    return d->m_requestMarkEnabled;
}

void BaseTextEditorWidget::setLineSeparatorsAllowed(bool b)
{
    d->m_lineSeparatorsAllowed = b;
}

bool BaseTextEditorWidget::lineSeparatorsAllowed() const
{
    return d->m_lineSeparatorsAllowed;
}

void BaseTextEditorWidget::updateCodeFoldingVisible()
{
    const bool visible = d->m_codeFoldingSupported && d->m_displaySettings.m_displayFoldingMarkers;
    if (d->m_codeFoldingVisible != visible) {
        d->m_codeFoldingVisible = visible;
        slotUpdateExtraAreaWidth();
    }
}

bool BaseTextEditorWidget::codeFoldingVisible() const
{
    return d->m_codeFoldingVisible;
}

/**
 * Sets whether code folding is supported by the syntax highlighter. When not
 * supported (the default), this makes sure the code folding is not shown.
 *
 * Needs to be called before calling setCodeFoldingVisible.
 */
void BaseTextEditorWidget::setCodeFoldingSupported(bool b)
{
    d->m_codeFoldingSupported = b;
    updateCodeFoldingVisible();
}

bool BaseTextEditorWidget::codeFoldingSupported() const
{
    return d->m_codeFoldingSupported;
}

void BaseTextEditorWidget::setMouseNavigationEnabled(bool b)
{
    d->m_behaviorSettings.m_mouseNavigation = b;
}

bool BaseTextEditorWidget::mouseNavigationEnabled() const
{
    return d->m_behaviorSettings.m_mouseNavigation;
}

void BaseTextEditorWidget::setScrollWheelZoomingEnabled(bool b)
{
    d->m_behaviorSettings.m_scrollWheelZooming = b;
}

bool BaseTextEditorWidget::scrollWheelZoomingEnabled() const
{
    return d->m_behaviorSettings.m_scrollWheelZooming;
}

void BaseTextEditorWidget::setConstrainTooltips(bool b)
{
    d->m_behaviorSettings.m_constrainHoverTooltips = b;
}

bool BaseTextEditorWidget::constrainTooltips() const
{
    return d->m_behaviorSettings.m_constrainHoverTooltips;
}

void BaseTextEditorWidget::setCamelCaseNavigationEnabled(bool b)
{
    d->m_behaviorSettings.m_camelCaseNavigation = b;
}

bool BaseTextEditorWidget::camelCaseNavigationEnabled() const
{
    return d->m_behaviorSettings.m_camelCaseNavigation;
}

void BaseTextEditorWidget::setRevisionsVisible(bool b)
{
    d->m_revisionsVisible = b;
    slotUpdateExtraAreaWidth();
}

bool BaseTextEditorWidget::revisionsVisible() const
{
    return d->m_revisionsVisible;
}

void BaseTextEditorWidget::setVisibleWrapColumn(int column)
{
    d->m_visibleWrapColumn = column;
    viewport()->update();
}

int BaseTextEditorWidget::visibleWrapColumn() const
{
    return d->m_visibleWrapColumn;
}

void BaseTextEditorWidget::setIndenter(Indenter *indenter)
{
    // clear out existing code formatter data
    for (QTextBlock it = document()->begin(); it.isValid(); it = it.next()) {
        TextEditor::TextBlockUserData *userData = BaseTextDocumentLayout::testUserData(it);
        if (userData)
            userData->setCodeFormatterData(0);
    }
    d->m_indenter.reset(indenter);
}

Indenter *BaseTextEditorWidget::indenter() const
{
    return d->m_indenter.data();
}

void BaseTextEditorWidget::setAutoCompleter(AutoCompleter *autoCompleter)
{
    d->m_autoCompleter.reset(autoCompleter);
}

AutoCompleter *BaseTextEditorWidget::autoCompleter() const
{
    return d->m_autoCompleter.data();
}

//--------- BaseTextEditorPrivate -----------

BaseTextEditorPrivate::BaseTextEditorPrivate()
    :
    m_lastScrollPos(-1),
    m_lineNumber(-1),
    q(0),
    m_contentsChanged(false),
    m_lastCursorChangeWasInteresting(false),
    m_document(new BaseTextDocument),
    m_parenthesesMatchingEnabled(false),
    m_updateTimer(0),
    m_formatRange(false),
    m_parenthesesMatchingTimer(0),
    m_extraArea(0),
    m_codeStylePreferences(0),
    extraAreaSelectionAnchorBlockNumber(-1),
    extraAreaToggleMarkBlockNumber(-1),
    extraAreaHighlightFoldedBlockNumber(-1),
    m_overlay(0),
    m_snippetOverlay(0),
    m_searchResultOverlay(0),
    m_refactorOverlay(0),
    visibleFoldedBlockNumber(-1),
    suggestedVisibleFoldedBlockNumber(-1),
    m_mouseOnFoldedMarker(false),
    m_marksVisible(false),
    m_codeFoldingVisible(false),
    m_codeFoldingSupported(false),
    m_revisionsVisible(false),
    m_lineNumbersVisible(true),
    m_highlightCurrentLine(true),
    m_requestMarkEnabled(true),
    m_lineSeparatorsAllowed(false),
    m_maybeFakeTooltipEvent(false),
    m_isCirculatingClipboard(false),
    m_visibleWrapColumn(0),
    m_linkPressed(false),
    m_delayedUpdateTimer(0),
    m_editor(0),
    m_actionHack(0),
    m_inBlockSelectionMode(false),
    m_moveLineUndoHack(false),
    m_findScopeVerticalBlockSelectionFirstColumn(-1),
    m_findScopeVerticalBlockSelectionLastColumn(-1),
    m_highlightBlocksTimer(0),
    m_codeAssistant(new CodeAssistant),
    m_assistRelevantContentAdded(false),
    m_cursorBlockNumber(-1),
    m_autoCompleter(new AutoCompleter),
    m_indenter(new Indenter)
{
}

BaseTextEditorPrivate::~BaseTextEditorPrivate()
{
}

void BaseTextEditorPrivate::setupDocumentSignals(BaseTextDocument *document)
{
    BaseTextDocument *oldDocument = q->baseTextDocument();
    if (oldDocument) {
        q->disconnect(oldDocument->document(), 0, q, 0);
        q->disconnect(oldDocument, 0, q, 0);
    }

    QTextDocument *doc = document->document();
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
    if (!documentLayout) {
        QTextOption opt = doc->defaultTextOption();
        opt.setTextDirection(Qt::LeftToRight);
        opt.setFlags(opt.flags() | QTextOption::IncludeTrailingSpaces
                | QTextOption::AddSpaceForLineAndParagraphSeparators
                );
        doc->setDefaultTextOption(opt);
        documentLayout = new BaseTextDocumentLayout(doc);
        doc->setDocumentLayout(documentLayout);
    }

    q->setDocument(doc);
    q->setCursorWidth(2); // Applies to the document layout

    QObject::connect(documentLayout, SIGNAL(updateBlock(QTextBlock)), q, SLOT(slotUpdateBlockNotify(QTextBlock)));
    QObject::connect(q, SIGNAL(requestBlockUpdate(QTextBlock)), documentLayout, SIGNAL(updateBlock(QTextBlock)));
    QObject::connect(doc, SIGNAL(modificationChanged(bool)), q, SIGNAL(changed()));
    QObject::connect(doc, SIGNAL(contentsChange(int,int,int)), q,
        SLOT(editorContentsChange(int,int,int)), Qt::DirectConnection);
    QObject::connect(document, SIGNAL(changed()), q, SIGNAL(changed()));
    QObject::connect(document, SIGNAL(titleChanged(QString)), q, SLOT(setDisplayName(const QString &)));
    QObject::connect(document, SIGNAL(aboutToReload()), q, SLOT(documentAboutToBeReloaded()));
    QObject::connect(document, SIGNAL(reloaded()), q, SLOT(documentReloaded()));
    q->slotUpdateExtraAreaWidth();
}


bool BaseTextEditorPrivate::snippetCheckCursor(const QTextCursor &cursor)
{
    if (!m_snippetOverlay->isVisible() || m_snippetOverlay->isEmpty())
        return false;

    QTextCursor start = cursor;
    start.setPosition(cursor.selectionStart());
    QTextCursor end = cursor;
    end.setPosition(cursor.selectionEnd());
    if (!m_snippetOverlay->hasCursorInSelection(start)
        || !m_snippetOverlay->hasCursorInSelection(end)
        || m_snippetOverlay->hasFirstSelectionBeginMoved()) {
        m_snippetOverlay->setVisible(false);
        m_snippetOverlay->clear();
        return false;
    }
    return true;
}

void BaseTextEditorPrivate::snippetTabOrBacktab(bool forward)
{
    if (!m_snippetOverlay->isVisible() || m_snippetOverlay->isEmpty())
        return;
    QTextCursor cursor = q->textCursor();
    OverlaySelection final;
    if (forward) {
        for (int i = 0; i < m_snippetOverlay->selections().count(); ++i){
            const OverlaySelection &selection = m_snippetOverlay->selections().at(i);
            if (selection.m_cursor_begin.position() >= cursor.position()
                && selection.m_cursor_end.position() > cursor.position()) {
                final = selection;
                break;
            }
        }
    } else {
        for (int i = m_snippetOverlay->selections().count()-1; i >= 0; --i){
            const OverlaySelection &selection = m_snippetOverlay->selections().at(i);
            if (selection.m_cursor_end.position() < cursor.position()) {
                final = selection;
                break;
            }
        }

    }
    if (final.m_cursor_begin.isNull())
        final = forward ? m_snippetOverlay->selections().first() : m_snippetOverlay->selections().last();

    if (final.m_cursor_begin.position() == final.m_cursor_end.position()) { // empty tab stop
        cursor.setPosition(final.m_cursor_end.position());
    } else {
        cursor.setPosition(final.m_cursor_begin.position());
        cursor.setPosition(final.m_cursor_end.position(), QTextCursor::KeepAnchor);
    }
    q->setTextCursor(cursor);
}

// Calculate global position for a tooltip considering the left extra area.
QPoint BaseTextEditorWidget::toolTipPosition(const QTextCursor &c) const
{
    const QPoint cursorPos = mapToGlobal(cursorRect(c).bottomRight() + QPoint(1,1));
    return cursorPos + QPoint(d->m_extraArea->width(),
#ifdef Q_WS_WIN
    -24
#else
    -16
#endif
    );
}

void BaseTextEditorWidget::processTooltipRequest(const QTextCursor &c)
{
    const QPoint toolTipPoint = toolTipPosition(c);
    bool handled = false;
    BaseTextEditor *ed = editor();
    emit ed->tooltipOverrideRequested(ed, toolTipPoint, c.position(), &handled);
    if (!handled)
        emit ed->tooltipRequested(ed, toolTipPoint, c.position());
}

bool BaseTextEditorWidget::viewportEvent(QEvent *event)
{
    d->m_contentsChanged = false;
    if (event->type() == QEvent::ToolTip) {
        if (QApplication::keyboardModifiers() & Qt::ControlModifier
                || (!(QApplication::keyboardModifiers() & Qt::ShiftModifier)
                    && d->m_behaviorSettings.m_constrainHoverTooltips)) {
            // Tooltips should be eaten when either control is pressed (so they don't get in the
            // way of code navigation) or if they are in constrained mode and shift is not pressed.
            return true;
        }
        const QHelpEvent *he = static_cast<QHelpEvent*>(event);
        const QPoint &pos = he->pos();

        RefactorMarker refactorMarker = d->m_refactorOverlay->markerAt(pos);
        if (refactorMarker.isValid() && !refactorMarker.tooltip.isEmpty()) {
            ToolTip::instance()->show(he->globalPos(),
                                      TextContent(refactorMarker.tooltip),
                                      viewport(),
                                      refactorMarker.rect);
            return true;
        }

        processTooltipRequest(cursorForPosition(pos));
        return true;
    }
    return QPlainTextEdit::viewportEvent(event);
}


void BaseTextEditorWidget::resizeEvent(QResizeEvent *e)
{
    QPlainTextEdit::resizeEvent(e);
    QRect cr = rect();
    d->m_extraArea->setGeometry(
        QStyle::visualRect(layoutDirection(), cr,
                           QRect(cr.left(), cr.top(), extraAreaWidth(), cr.height())));
}

QRect BaseTextEditorWidget::foldBox()
{
    if (d->m_highlightBlocksInfo.isEmpty() || d->extraAreaHighlightFoldedBlockNumber < 0)
        return QRect();

    QTextBlock begin = document()->findBlockByNumber(d->m_highlightBlocksInfo.open.last());

    QTextBlock end = document()->findBlockByNumber(d->m_highlightBlocksInfo.close.first());
    if (!begin.isValid() || !end.isValid())
        return QRect();
    QRectF br = blockBoundingGeometry(begin).translated(contentOffset());
    QRectF er = blockBoundingGeometry(end).translated(contentOffset());

    return QRect(d->m_extraArea->width() - foldBoxWidth(fontMetrics()),
                 int(br.top()),
                 foldBoxWidth(fontMetrics()),
                 er.bottom() - br.top());
}

QTextBlock BaseTextEditorWidget::foldedBlockAt(const QPoint &pos, QRect *box) const
{
    QPointF offset(contentOffset());
    QTextBlock block = firstVisibleBlock();
    qreal top = blockBoundingGeometry(block).translated(offset).top();
    qreal bottom = top + blockBoundingRect(block).height();

    int viewportHeight = viewport()->height();

    while (block.isValid() && top <= viewportHeight) {
        QTextBlock nextBlock = block.next();
        if (block.isVisible() && bottom >= 0) {
            if (nextBlock.isValid() && !nextBlock.isVisible()) {
                QTextLayout *layout = block.layout();
                QTextLine line = layout->lineAt(layout->lineCount()-1);
                QRectF lineRect = line.naturalTextRect().translated(offset.x(), top);
                lineRect.adjust(0, 0, -1, -1);

                QString replacement = QLatin1String(" {") + foldReplacementText(block)
                        + QLatin1String("}; ");

                QRectF collapseRect(lineRect.right() + 12,
                                    lineRect.top(),
                                    fontMetrics().width(replacement),
                                    lineRect.height());
                if (collapseRect.contains(pos)) {
                    QTextBlock result = block;
                    if (box)
                        *box = collapseRect.toAlignedRect();
                    return result;
                } else {
                    block = nextBlock;
                    while (nextBlock.isValid() && !nextBlock.isVisible()) {
                        block = nextBlock;
                        nextBlock = block.next();
                    }
                }
            }
        }

        block = nextBlock;
        top = bottom;
        bottom = top + blockBoundingRect(block).height();
    }
    return QTextBlock();
}

void BaseTextEditorPrivate::highlightSearchResults(const QTextBlock &block,
                                                   TextEditorOverlay *overlay)
{
    if (m_searchExpr.isEmpty())
        return;

    int blockPosition = block.position();

    QTextCursor cursor = q->textCursor();
    QString text = block.text();
    text.replace(QChar::Nbsp, QLatin1Char(' '));
    int idx = -1;
    int l = 1;

    while (idx < text.length()) {
        idx = m_searchExpr.indexIn(text, idx + l);
        if (idx < 0)
            break;
        l = m_searchExpr.matchedLength();
        if (l == 0)
            break;
        if ((m_findFlags & Find::FindWholeWords)
            && ((idx && text.at(idx-1).isLetterOrNumber())
                || (idx + l < text.length() && text.at(idx + l).isLetterOrNumber())))
            continue;

        if (!q->inFindScope(blockPosition + idx, blockPosition + idx + l))
            continue;

        overlay->addOverlaySelection(blockPosition + idx,
                                     blockPosition + idx + l,
                                     m_searchResultFormat.background().color().darker(120),
                                     QColor(),
                                     (idx == cursor.selectionStart() - blockPosition
                                      && idx + l == cursor.selectionEnd() - blockPosition)?
                                     TextEditorOverlay::DropShadow : 0);

    }
}


namespace TextEditor {
    namespace Internal {
        struct BlockSelectionData {
            int selectionIndex;
            int selectionStart;
            int selectionEnd;
            int firstColumn;
            int lastColumn;
        };
    }
}

void BaseTextEditorPrivate::clearBlockSelection()
{
    if (m_inBlockSelectionMode) {
        m_inBlockSelectionMode = false;
        m_blockSelection.clear();
        QTextCursor cursor = q->textCursor();
        cursor.clearSelection();
        q->setTextCursor(cursor);
    }
}

QString BaseTextEditorPrivate::copyBlockSelection()
{
    QString selection;
    QTextCursor cursor = q->textCursor();
    if (!m_inBlockSelectionMode)
        return selection;
    const TabSettings &ts = q->tabSettings();
    QTextBlock block = m_blockSelection.firstBlock.block();
    QTextBlock lastBlock = m_blockSelection.lastBlock.block();
    for (;;) {
        QString text = block.text();
        int startOffset = 0;
        int startPos = ts.positionAtColumn(text, m_blockSelection.firstVisualColumn, &startOffset);
        int endOffset = 0;
        int endPos = ts.positionAtColumn(text, m_blockSelection.lastVisualColumn, &endOffset);

        if (startPos == endPos) {
            selection += QString(endOffset - startOffset, QLatin1Char(' '));
        } else {
            if (startOffset < 0)
                selection += QString(-startOffset, QLatin1Char(' '));
            if (endOffset < 0)
                --endPos;
            selection += text.mid(startPos, endPos - startPos);
            if (endOffset < 0) {
                selection += QString(ts.m_tabSize + endOffset, QLatin1Char(' '));
            } else if (endOffset > 0) {
                selection += QString(endOffset, QLatin1Char(' '));
            }
        }
        if (block == lastBlock)
            break;
        selection += QLatin1Char('\n');
        block = block.next();
    }
    return selection;
}

void BaseTextEditorPrivate::removeBlockSelection(const QString &text)
{
    QTextCursor cursor = q->textCursor();
    if (!cursor.hasSelection() || !m_inBlockSelectionMode)
        return;

    int cursorPosition = cursor.selectionStart();
    cursor.clearSelection();
    cursor.beginEditBlock();

    const TabSettings &ts = q->tabSettings();
    QTextBlock block = m_blockSelection.firstBlock.block();
    QTextBlock lastBlock = m_blockSelection.lastBlock.block();
    for (;;) {
        QString text = block.text();
        int startOffset = 0;
        int startPos = ts.positionAtColumn(text, m_blockSelection.firstVisualColumn, &startOffset);
        int endOffset = 0;
        int endPos = ts.positionAtColumn(text, m_blockSelection.lastVisualColumn, &endOffset);

        cursor.setPosition(block.position() + startPos);
        cursor.setPosition(block.position() + endPos, QTextCursor::KeepAnchor);
        cursor.removeSelectedText();

        if (startOffset < 0)
            cursor.insertText(QString(ts.m_tabSize + startOffset, QLatin1Char(' ')));
        if (endOffset < 0)
            cursor.insertText(QString(-endOffset, QLatin1Char(' ')));

        if (block == lastBlock)
            break;
        block = block.next();
    }

    cursor.setPosition(cursorPosition);
    if (!text.isEmpty())
        cursor.insertText(text);
    cursor.endEditBlock();
    q->setTextCursor(cursor);
}

void BaseTextEditorPrivate::moveCursorVisible(bool ensureVisible)
{
    QTextCursor cursor = q->textCursor();
    if (!cursor.block().isVisible()) {
        cursor.setVisualNavigation(true);
        cursor.movePosition(QTextCursor::Up);
        q->setTextCursor(cursor);
    }
    if (ensureVisible)
        q->ensureCursorVisible();
}

static QColor blendColors(const QColor &a, const QColor &b, int alpha)
{
    return QColor((a.red()   * (256 - alpha) + b.red()   * alpha) / 256,
                  (a.green() * (256 - alpha) + b.green() * alpha) / 256,
                  (a.blue()  * (256 - alpha) + b.blue()  * alpha) / 256);
}

static QColor calcBlendColor(const QColor &baseColor, int level, int count)
{
    QColor color80;
    QColor color90;

    if (baseColor.value() > 128) {
        const int f90 = 15;
        const int f80 = 30;
        color80.setRgb(qMax(0, baseColor.red() - f80),
                       qMax(0, baseColor.green() - f80),
                       qMax(0, baseColor.blue() - f80));
        color90.setRgb(qMax(0, baseColor.red() - f90),
                       qMax(0, baseColor.green() - f90),
                       qMax(0, baseColor.blue() - f90));
    } else {
        const int f90 = 20;
        const int f80 = 40;
        color80.setRgb(qMin(255, baseColor.red() + f80),
                       qMin(255, baseColor.green() + f80),
                       qMin(255, baseColor.blue() + f80));
        color90.setRgb(qMin(255, baseColor.red() + f90),
                       qMin(255, baseColor.green() + f90),
                       qMin(255, baseColor.blue() + f90));
    }

    if (level == count)
        return baseColor;
    if (level == 0)
        return color80;
    if (level == count - 1)
        return color90;

    const int blendFactor = level * (256 / (count - 2));

    return blendColors(color80, color90, blendFactor);
}

void BaseTextEditorWidget::paintEvent(QPaintEvent *e)
{
    /*
      Here comes an almost verbatim copy of
      QPlainTextEdit::paintEvent() so we can adjust the extra
      selections dynamically to indicate all search results.
    */
    //begin QPlainTextEdit::paintEvent()

    QPainter painter(viewport());
    QTextDocument *doc = document();
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);

    QPointF offset(contentOffset());
    QTextBlock textCursorBlock = textCursor().block();

    bool hasMainSelection = textCursor().hasSelection();
    bool suppressSyntaxInIfdefedOutBlock = (d->m_ifdefedOutFormat.foreground()
                                           != palette().foreground());

    QRect er = e->rect();
    QRect viewportRect = viewport()->rect();

    qreal lineX = 0;

    if (d->m_visibleWrapColumn > 0) {
        // Don't use QFontMetricsF::averageCharWidth here, due to it returning
        // a fractional size even when this is not supported by the platform.
        lineX = QFontMetricsF(font()).width(QLatin1Char('x')) * d->m_visibleWrapColumn + offset.x() + 4;

        if (lineX < viewportRect.width()) {
            const QBrush background = d->m_ifdefedOutFormat.background();
            painter.fillRect(QRectF(lineX, er.top(), viewportRect.width() - lineX, er.height()),
                             background);

            const QColor col = (palette().base().color().value() > 128) ? Qt::black : Qt::white;
            const QPen pen = painter.pen();
            painter.setPen(blendColors(background.isOpaque() ? background.color() : palette().base().color(),
                                       col, 32));
            painter.drawLine(QPointF(lineX, er.top()), QPointF(lineX, er.bottom()));
            painter.setPen(pen);
        }
    }

    // Set a brush origin so that the WaveUnderline knows where the wave started
    painter.setBrushOrigin(offset);

//    // keep right margin clean from full-width selection
//    int maxX = offset.x() + qMax((qreal)viewportRect.width(), documentLayout->documentSize().width())
//               - doc->documentMargin();
//    er.setRight(qMin(er.right(), maxX));
//    painter.setClipRect(er);

    bool editable = !isReadOnly();
    QTextBlock block = firstVisibleBlock();

    QAbstractTextDocumentLayout::PaintContext context = getPaintContext();

    if (!d->m_highlightBlocksInfo.isEmpty()) {
        const QColor baseColor = palette().base().color();

        // extra pass for the block highlight

        const int margin = 5;
        QTextBlock blockFP = block;
        QPointF offsetFP = offset;
        while (blockFP.isValid()) {
            QRectF r = blockBoundingRect(blockFP).translated(offsetFP);

            int n = blockFP.blockNumber();
            int depth = 0;
            foreach (int i, d->m_highlightBlocksInfo.open)
                if (n >= i)
                    ++depth;
            foreach (int i, d->m_highlightBlocksInfo.close)
                if (n > i)
                    --depth;

            int count = d->m_highlightBlocksInfo.count();
            if (count) {
                for (int i = 0; i <= depth; ++i) {
                    const QColor &blendedColor = calcBlendColor(baseColor, i, count);
                    int vi = i > 0 ? d->m_highlightBlocksInfo.visualIndent.at(i-1) : 0;
                    QRectF oneRect = r;
                    oneRect.setWidth(viewport()->width());
                    oneRect.adjust(vi, 0, -8*i, 0);
                    if (oneRect.left() >= oneRect.right())
                        continue;
                    if (lineX > 0 && oneRect.left() < lineX && oneRect.right() > lineX) {
                        QRectF otherRect = r;
                        otherRect.setLeft(lineX + 1);
                        otherRect.setRight(oneRect.right());
                        oneRect.setRight(lineX - 1);
                        painter.fillRect(otherRect, blendedColor);
                    }
                    painter.fillRect(oneRect, blendedColor);
                }
            }
            offsetFP.ry() += r.height();

            if (offsetFP.y() > viewportRect.height() + margin)
                break;

            blockFP = blockFP.next();
            if (!blockFP.isVisible()) {
                // invisible blocks do have zero line count
                blockFP = doc->findBlockByLineNumber(blockFP.firstLineNumber());
            }
        }
    }

    int blockSelectionIndex = -1;

    if (d->m_inBlockSelectionMode
        && context.selections.count() && context.selections.last().cursor == textCursor()) {
        blockSelectionIndex = context.selections.size()-1;
        context.selections[blockSelectionIndex].format.clearBackground();
    }

    QTextBlock visibleCollapsedBlock;
    QPointF visibleCollapsedBlockOffset;

    QTextLayout *cursor_layout = 0;
    QPointF cursor_offset;
    int cursor_cpos = 0;
    QPen cursor_pen;

    d->m_searchResultOverlay->clear();
    if (!d->m_searchExpr.isEmpty()) { // first pass for the search result overlays

        const int margin = 5;
        QTextBlock blockFP = block;
        QPointF offsetFP = offset;
        while (blockFP.isValid()) {
            QRectF r = blockBoundingRect(blockFP).translated(offsetFP);

            if (r.bottom() >= er.top() - margin && r.top() <= er.bottom() + margin) {
                d->highlightSearchResults(blockFP,
                                          d->m_searchResultOverlay);
            }
            offsetFP.ry() += r.height();

            if (offsetFP.y() > viewportRect.height() + margin)
                break;

            blockFP = blockFP.next();
            if (!blockFP.isVisible()) {
                // invisible blocks do have zero line count
                blockFP = doc->findBlockByLineNumber(blockFP.firstLineNumber());
            }
        }

    } // end first pass


    { // extra pass for ifdefed out blocks
        QTextBlock blockIDO = block;
        QPointF offsetIDO = offset;
        while (blockIDO.isValid()) {

            QRectF r = blockBoundingRect(blockIDO).translated(offsetIDO);

            if (r.bottom() >= er.top() && r.top() <= er.bottom()) {
                if (BaseTextDocumentLayout::ifdefedOut(blockIDO)) {
                    QRectF rr = r;
                    rr.setRight(viewportRect.width() - offset.x());
                    if (lineX > 0)
                        rr.setRight(qMin(lineX, rr.right()));
                    painter.fillRect(rr, d->m_ifdefedOutFormat.background());
                }
            }
            offsetIDO.ry() += r.height();

            if (offsetIDO.y() > viewportRect.height())
                break;

            blockIDO = blockIDO.next();
            if (!blockIDO.isVisible()) {
                // invisible blocks do have zero line count
                blockIDO = doc->findBlockByLineNumber(blockIDO.firstLineNumber());
            }

        }
    }

    // possible extra pass for the block selection find scope
    if (!d->m_findScopeStart.isNull() && d->m_findScopeVerticalBlockSelectionFirstColumn >= 0) {
        QTextBlock blockFS = block;
        QPointF offsetFS = offset;
        while (blockFS.isValid()) {

            QRectF r = blockBoundingRect(blockFS).translated(offsetFS);

            if (r.bottom() >= er.top() && r.top() <= er.bottom()) {

                if (blockFS.position() >= d->m_findScopeStart.block().position()
                        && blockFS.position() <= d->m_findScopeEnd.block().position()) {
                    QTextLayout *layout = blockFS.layout();
                    QString text = blockFS.text();
                    const TabSettings &ts = tabSettings();
                    qreal spacew = QFontMetricsF(font()).width(QLatin1Char(' '));

                    int offset = 0;
                    int relativePos  =  ts.positionAtColumn(text,
                                                            d->m_findScopeVerticalBlockSelectionFirstColumn,
                                                            &offset);
                    QTextLine line = layout->lineForTextPosition(relativePos);
                    qreal x = line.cursorToX(relativePos) + offset * spacew;

                    int eoffset = 0;
                    int erelativePos  =  ts.positionAtColumn(text,
                                                             d->m_findScopeVerticalBlockSelectionLastColumn,
                                                             &eoffset);
                    QTextLine eline = layout->lineForTextPosition(erelativePos);
                    qreal ex = eline.cursorToX(erelativePos) + eoffset * spacew;

                    QRectF rr = line.naturalTextRect();
                    rr.moveTop(rr.top() + r.top());
                    rr.setLeft(r.left() + x);
                    if (line.lineNumber() == eline.lineNumber())  {
                        rr.setRight(r.left() + ex);
                    }
                    painter.fillRect(rr, d->m_searchScopeFormat.background());

                    QColor lineCol = d->m_searchScopeFormat.foreground().color();
                    QPen pen = painter.pen();
                    painter.setPen(lineCol);
                    if (blockFS == d->m_findScopeStart.block())
                        painter.drawLine(rr.topLeft(), rr.topRight());
                    if (blockFS == d->m_findScopeEnd.block())
                        painter.drawLine(rr.bottomLeft(), rr.bottomRight());
                    painter.drawLine(rr.topLeft(), rr.bottomLeft());
                    painter.drawLine(rr.topRight(), rr.bottomRight());
                    painter.setPen(pen);
                }
            }
            offsetFS.ry() += r.height();

            if (offsetFS.y() > viewportRect.height())
                break;

            blockFS = blockFS.next();
            if (!blockFS.isVisible()) {
                // invisible blocks do have zero line count
                blockFS = doc->findBlockByLineNumber(blockFS.firstLineNumber());
            }

        }
    }

    if (!d->m_findScopeStart.isNull() && d->m_findScopeVerticalBlockSelectionFirstColumn < 0) {

        TextEditorOverlay *overlay = new TextEditorOverlay(this);
        overlay->addOverlaySelection(d->m_findScopeStart.position(),
                                     d->m_findScopeEnd.position(),
                                     d->m_searchScopeFormat.foreground().color(),
                                     d->m_searchScopeFormat.background().color(),
                                     TextEditorOverlay::ExpandBegin);
        overlay->setAlpha(false);
        overlay->paint(&painter, e->rect());
        delete overlay;
    }



    d->m_searchResultOverlay->fill(&painter,
                                   d->m_searchResultFormat.background().color(),
                                   e->rect());


    while (block.isValid()) {

        QRectF r = blockBoundingRect(block).translated(offset);

        if (r.bottom() >= er.top() && r.top() <= er.bottom()) {

            QTextLayout *layout = block.layout();

            QTextOption option = layout->textOption();
            if (suppressSyntaxInIfdefedOutBlock && BaseTextDocumentLayout::ifdefedOut(block)) {
                option.setFlags(option.flags() | QTextOption::SuppressColors);
                painter.setPen(d->m_ifdefedOutFormat.foreground().color());
            } else {
                option.setFlags(option.flags() & ~QTextOption::SuppressColors);
                painter.setPen(context.palette.text().color());
            }
            layout->setTextOption(option);
            layout->setFont(doc->defaultFont()); // this really should be in qplaintextedit when creating the layout!

            int blpos = block.position();
            int bllen = block.length();

            QVector<QTextLayout::FormatRange> selections;
            QVector<QTextLayout::FormatRange> prioritySelections;

            for (int i = 0; i < context.selections.size(); ++i) {
                const QAbstractTextDocumentLayout::Selection &range = context.selections.at(i);
                const int selStart = range.cursor.selectionStart() - blpos;
                const int selEnd = range.cursor.selectionEnd() - blpos;
                if (selStart < bllen && selEnd >= 0
                    && selEnd >= selStart) {
                    QTextLayout::FormatRange o;
                    o.start = selStart;
                    o.length = selEnd - selStart;
                    o.format = range.format;
                    if (i == blockSelectionIndex) {
                        QString text = block.text();
                        const TabSettings &ts = tabSettings();
                        o.start = ts.positionAtColumn(text, d->m_blockSelection.firstVisualColumn);
                        o.length = ts.positionAtColumn(text, d->m_blockSelection.lastVisualColumn) - o.start;
                    }
                    if ((hasMainSelection && i == context.selections.size()-1)
                        || (o.format.foreground().style() == Qt::NoBrush
                        && o.format.underlineStyle() != QTextCharFormat::NoUnderline
                        && o.format.background() == Qt::NoBrush))
                        prioritySelections.append(o);
                    else
                        selections.append(o);
                }
#if 0
                // we disable fullwidth selection. It's only used for m_highlightCurrentLine which we
                // do differently now
                else if (!range.cursor.hasSelection() && range.format.hasProperty(QTextFormat::FullWidthSelection)
                    && block.contains(range.cursor.position())) {
                    // for full width selections we don't require an actual selection, just
                    // a position to specify the line. that's more convenience in usage.
                    QTextLayout::FormatRange o;
                    QTextLine l = layout->lineForTextPosition(range.cursor.position() - blpos);
                    o.start = l.textStart();
                    o.length = l.textLength();
                    if (o.start + o.length == bllen - 1)
                        ++o.length; // include newline
                    o.format = range.format;
                    selections.append(o);
                }
#endif
            }
            selections += prioritySelections;

            if (d->m_highlightCurrentLine && block == textCursorBlock) {

                QRectF rr = layout->lineForTextPosition(textCursor().positionInBlock()).rect();
                rr.moveTop(rr.top() + r.top());
                rr.setLeft(0);
                rr.setRight(viewportRect.width() - offset.x());
                QColor color = d->m_currentLineFormat.background().color();
                // set alpha, otherwise we cannot see block highlighting and find scope underneath
                color.setAlpha(128);
                painter.fillRect(rr, color);
            }


            QRectF blockSelectionCursorRect;
            if (d->m_inBlockSelectionMode
                    && block.position() >= d->m_blockSelection.firstBlock.block().position()
                    && block.position() <= d->m_blockSelection.lastBlock.block().position()) {
                QString text = block.text();
                const TabSettings &ts = tabSettings();
                qreal spacew = QFontMetricsF(font()).width(QLatin1Char(' '));

                int offset = 0;
                int relativePos  =  ts.positionAtColumn(text, d->m_blockSelection.firstVisualColumn, &offset);
                QTextLine line = layout->lineForTextPosition(relativePos);
                qreal x = line.cursorToX(relativePos) + offset * spacew;

                int eoffset = 0;
                int erelativePos  =  ts.positionAtColumn(text, d->m_blockSelection.lastVisualColumn, &eoffset);
                QTextLine eline = layout->lineForTextPosition(erelativePos);
                qreal ex = eline.cursorToX(erelativePos) + eoffset * spacew;

                QRectF rr = line.naturalTextRect();
                rr.moveTop(rr.top() + r.top());
                rr.setLeft(r.left() + x);
                if (line.lineNumber() == eline.lineNumber())  {
                    rr.setRight(r.left() + ex);
                }
                painter.fillRect(rr, palette().highlight());
                if ((d->m_blockSelection.anchor == BaseTextBlockSelection::TopLeft
                        && block == d->m_blockSelection.firstBlock.block())
                        || (d->m_blockSelection.anchor == BaseTextBlockSelection::BottomLeft
                            && block == d->m_blockSelection.lastBlock.block())
                        ) {
                    rr.setRight(rr.left()+2);
                    blockSelectionCursorRect = rr;
                }
                for (int i = line.lineNumber() + 1; i < eline.lineNumber(); ++i) {
                    rr = layout->lineAt(i).naturalTextRect();
                    rr.moveTop(rr.top() + r.top());
                    rr.setLeft(r.left() + x);
                    painter.fillRect(rr, palette().highlight());
                }

                rr = eline.naturalTextRect();
                rr.moveTop(rr.top() + r.top());
                rr.setRight(r.left() + ex);
                if (line.lineNumber() != eline.lineNumber())
                    painter.fillRect(rr, palette().highlight());
                if ((d->m_blockSelection.anchor == BaseTextBlockSelection::TopRight
                     && block == d->m_blockSelection.firstBlock.block())
                        || (d->m_blockSelection.anchor == BaseTextBlockSelection::BottomRight
                            && block == d->m_blockSelection.lastBlock.block())) {
                    rr.setLeft(rr.right()-2);
                    blockSelectionCursorRect = rr;
                }
            }


            bool drawCursor = ((editable || true) // we want the cursor in read-only mode
                               && context.cursorPosition >= blpos
                               && context.cursorPosition < blpos + bllen);

            bool drawCursorAsBlock = drawCursor && overwriteMode() ;

            if (drawCursorAsBlock) {
                int relativePos = context.cursorPosition - blpos;
                bool doSelection = true;
                QTextLine line = layout->lineForTextPosition(relativePos);
                qreal x = line.cursorToX(relativePos);
                qreal w = 0;
                if (relativePos < line.textLength() - line.textStart()) {
                    w = line.cursorToX(relativePos + 1) - x;
                    if (doc->characterAt(context.cursorPosition) == QLatin1Char('\t')) {
                        doSelection = false;
                        qreal space = QFontMetricsF(layout->font()).width(QLatin1Char(' '));
                        if (w > space) {
                            x += w-space;
                            w = space;
                        }
                    }
                } else
                    w = QFontMetrics(layout->font()).width(QLatin1Char(' ')); // in sync with QTextLine::draw()

                QRectF rr = line.rect();
                rr.moveTop(rr.top() + r.top());
                rr.moveLeft(r.left() + x);
                rr.setWidth(w);
                painter.fillRect(rr, palette().text());
                if (doSelection) {
                    QTextLayout::FormatRange o;
                    o.start = relativePos;
                    o.length = 1;
                    o.format.setForeground(palette().base());
                    selections.append(o);
                }
            }



            layout->draw(&painter, offset, selections, er);

            if ((drawCursor && !drawCursorAsBlock)
                || (editable && context.cursorPosition < -1
                    && !layout->preeditAreaText().isEmpty())) {
                int cpos = context.cursorPosition;
                if (cpos < -1)
                    cpos = layout->preeditAreaPosition() - (cpos + 2);
                else
                    cpos -= blpos;
                cursor_layout = layout;
                cursor_offset = offset;
                cursor_cpos = cpos;
                cursor_pen = painter.pen();
            }

#ifndef Q_OS_MAC // no visible cursor on mac
            if (blockSelectionCursorRect.isValid())
                painter.fillRect(blockSelectionCursorRect, palette().text());
#endif

        }

        offset.ry() += r.height();

        if (offset.y() > viewportRect.height())
            break;

        block = block.next();

        if (!block.isVisible()) {
            if (block.blockNumber() == d->visibleFoldedBlockNumber) {
                visibleCollapsedBlock = block;
                visibleCollapsedBlockOffset = offset + QPointF(0,1);
            }

            // invisible blocks do have zero line count
            block = doc->findBlockByLineNumber(block.firstLineNumber());
        }
    }
    painter.setPen(context.palette.text().color());

    if (backgroundVisible() && !block.isValid() && offset.y() <= er.bottom()
        && (centerOnScroll() || verticalScrollBar()->maximum() == verticalScrollBar()->minimum())) {
        painter.fillRect(QRect(QPoint((int)er.left(), (int)offset.y()), er.bottomRight()), palette().background());
    }

    //end QPlainTextEdit::paintEvent()

    offset = contentOffset();
    block = firstVisibleBlock();

    qreal top = blockBoundingGeometry(block).translated(offset).top();
    qreal bottom = top + blockBoundingRect(block).height();

    QTextCursor cursor = textCursor();
    bool hasSelection = cursor.hasSelection();
    int selectionStart = cursor.selectionStart();
    int selectionEnd = cursor.selectionEnd();


    while (block.isValid() && top <= e->rect().bottom()) {
        QTextBlock nextBlock = block.next();
        QTextBlock nextVisibleBlock = nextBlock;

        if (!nextVisibleBlock.isVisible()) {
            // invisible blocks do have zero line count
            nextVisibleBlock = doc->findBlockByLineNumber(nextVisibleBlock.firstLineNumber());
            // paranoia in case our code somewhere did not set the line count
            // of the invisible block to 0
            while (nextVisibleBlock.isValid() && !nextVisibleBlock.isVisible())
                nextVisibleBlock = nextVisibleBlock.next();
        }
        if (block.isVisible() && bottom >= e->rect().top()) {
            if (d->m_displaySettings.m_visualizeWhitespace) {
                QTextLayout *layout = block.layout();
                int lineCount = layout->lineCount();
                if (lineCount >= 2 || !nextBlock.isValid()) {
                    painter.save();
                    painter.setPen(Qt::lightGray);
                    for (int i = 0; i < lineCount-1; ++i) { // paint line wrap indicator
                        QTextLine line = layout->lineAt(i);
                        QRectF lineRect = line.naturalTextRect().translated(offset.x(), top);
                        QChar visualArrow((ushort)0x21b5);
                        painter.drawText(QPointF(lineRect.right(),
                                                 lineRect.top() + line.ascent()),
                                         visualArrow);
                    }
                    if (!nextBlock.isValid()) { // paint EOF symbol
                        QTextLine line = layout->lineAt(lineCount-1);
                        QRectF lineRect = line.naturalTextRect().translated(offset.x(), top);
                        int h = 4;
                        lineRect.adjust(0, 0, -1, -1);
                        QPainterPath path;
                        QPointF pos(lineRect.topRight() + QPointF(h+4, line.ascent()));
                        path.moveTo(pos);
                        path.lineTo(pos + QPointF(-h, -h));
                        path.lineTo(pos + QPointF(0, -2*h));
                        path.lineTo(pos + QPointF(h, -h));
                        path.closeSubpath();
                        painter.setBrush(painter.pen().color());
                        painter.drawPath(path);
                    }
                    painter.restore();
                }
            }

            if (nextBlock.isValid() && !nextBlock.isVisible()) {

                bool selectThis = (hasSelection
                                   && nextBlock.position() >= selectionStart
                                   && nextBlock.position() < selectionEnd);
                if (selectThis) {
                    painter.save();
                    painter.setBrush(palette().highlight());
                }

                QTextLayout *layout = block.layout();
                QTextLine line = layout->lineAt(layout->lineCount()-1);
                QRectF lineRect = line.naturalTextRect().translated(offset.x(), top);
                lineRect.adjust(0, 0, -1, -1);

                QString replacement = foldReplacementText(block);
                QString rectReplacement = QLatin1String(" {") + replacement + QLatin1String("}; ");

                QRectF collapseRect(lineRect.right() + 12,
                                    lineRect.top(),
                                    fontMetrics().width(rectReplacement),
                                    lineRect.height());
                painter.setRenderHint(QPainter::Antialiasing, true);
                painter.translate(.5, .5);
                painter.drawRoundedRect(collapseRect.adjusted(0, 0, 0, -1), 3, 3);
                painter.setRenderHint(QPainter::Antialiasing, false);
                painter.translate(-.5, -.5);

                if (TextBlockUserData *nextBlockUserData = BaseTextDocumentLayout::testUserData(nextBlock)) {
                    if (nextBlockUserData->foldingStartIncluded())
                        replacement.prepend(nextBlock.text().trimmed().left(1));
                }

                block = nextVisibleBlock.previous();
                if (!block.isValid())
                    block = doc->lastBlock();

                if (TextBlockUserData *blockUserData = BaseTextDocumentLayout::testUserData(block)) {
                    if (blockUserData->foldingEndIncluded()) {
                        QString right = block.text().trimmed();
                        if (right.endsWith(QLatin1Char(';'))) {
                            right.chop(1);
                            right = right.trimmed();
                            replacement.append(right.right(right.endsWith(QLatin1Char('/')) ? 2 : 1));
                            replacement.append(QLatin1Char(';'));
                        } else {
                            replacement.append(right.right(right.endsWith(QLatin1Char('/')) ? 2 : 1));
                        }
                    }
                }

                if (selectThis)
                    painter.setPen(palette().highlightedText().color());
                painter.drawText(collapseRect, Qt::AlignCenter, replacement);
                if (selectThis)
                    painter.restore();
            }
        }

        block = nextVisibleBlock;
        top = bottom;
        bottom = top + blockBoundingRect(block).height();
    }

    if (d->m_animator && d->m_animator->isRunning()) {
        QTextCursor cursor = textCursor();
        cursor.setPosition(d->m_animator->position());
        d->m_animator->draw(&painter, cursorRect(cursor).topLeft());
    }

    // draw the overlays, but only if we do not have a find scope, otherwise the
    // view becomes too noisy.
    if (d->m_findScopeStart.isNull()) {
        if (d->m_overlay->isVisible())
            d->m_overlay->paint(&painter, e->rect());

        if (d->m_snippetOverlay->isVisible())
            d->m_snippetOverlay->paint(&painter, e->rect());

        if (!d->m_refactorOverlay->isEmpty())
            d->m_refactorOverlay->paint(&painter, e->rect());
    }

    if (!d->m_searchResultOverlay->isEmpty()) {
        d->m_searchResultOverlay->paint(&painter, e->rect());
        d->m_searchResultOverlay->clear();
    }


    // draw the cursor last, on top of everything
    if (cursor_layout && !d->m_inBlockSelectionMode) {
        painter.setPen(cursor_pen);
        cursor_layout->drawCursor(&painter, cursor_offset, cursor_cpos, cursorWidth());
    }

    if (visibleCollapsedBlock.isValid()) {
        drawCollapsedBlockPopup(painter,
                                visibleCollapsedBlock,
                                visibleCollapsedBlockOffset,
                                er);
    }
}

void BaseTextEditorWidget::drawCollapsedBlockPopup(QPainter &painter,
                                             const QTextBlock &block,
                                             QPointF offset,
                                             const QRect &clip)
{
    int margin = block.document()->documentMargin();
    qreal maxWidth = 0;
    qreal blockHeight = 0;
    QTextBlock b = block;

    while (!b.isVisible()) {
        b.setVisible(true); // make sure block bounding rect works
        QRectF r = blockBoundingRect(b).translated(offset);

        QTextLayout *layout = b.layout();
        for (int i = layout->lineCount()-1; i >= 0; --i)
            maxWidth = qMax(maxWidth, layout->lineAt(i).naturalTextWidth() + 2*margin);

        blockHeight += r.height();

        b.setVisible(false); // restore previous state
        b.setLineCount(0); // restore 0 line count for invisible block
        b = b.next();
    }

    painter.save();
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.translate(.5, .5);
    QBrush brush = palette().base();
    if (d->m_ifdefedOutFormat.hasProperty(QTextFormat::BackgroundBrush))
        brush = d->m_ifdefedOutFormat.background();
    painter.setBrush(brush);
    painter.drawRoundedRect(QRectF(offset.x(),
                                   offset.y(),
                                   maxWidth, blockHeight).adjusted(0, 0, 0, 0), 3, 3);
    painter.restore();

    QTextBlock end = b;
    b = block;
    while (b != end) {
        b.setVisible(true); // make sure block bounding rect works
        QRectF r = blockBoundingRect(b).translated(offset);
        QTextLayout *layout = b.layout();
        QVector<QTextLayout::FormatRange> selections;
        layout->draw(&painter, offset, selections, clip);

        b.setVisible(false); // restore previous state
        b.setLineCount(0); // restore 0 line count for invisible block
        offset.ry() += r.height();
        b = b.next();
    }
}

QWidget *BaseTextEditorWidget::extraArea() const
{
    return d->m_extraArea;
}

int BaseTextEditorWidget::extraAreaWidth(int *markWidthPtr) const
{
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(document()->documentLayout());
    if (!documentLayout)
        return 0;

    if (!d->m_marksVisible && documentLayout->hasMarks)
        d->m_marksVisible = true;

    int space = 0;
    const QFontMetrics fm(d->m_extraArea->fontMetrics());

    if (d->m_lineNumbersVisible) {
        QFont fnt = d->m_extraArea->font();
        // this works under the assumption that bold or italic
        // can only make a font wider
        fnt.setBold(d->m_currentLineNumberFormat.font().bold());
        fnt.setItalic(d->m_currentLineNumberFormat.font().italic());
        const QFontMetrics linefm(fnt);

        int digits = 2;
        int max = qMax(1, blockCount());
        while (max >= 100) {
            max /= 10;
            ++digits;
        }
        space += linefm.width(QLatin1Char('9')) * digits;
    }
    int markWidth = 0;

    if (d->m_marksVisible) {
        markWidth += documentLayout->maxMarkWidthFactor * fm.lineSpacing();

//     if (documentLayout->doubleMarkCount)
//         markWidth += fm.lineSpacing() / 3;
        space += markWidth;
    } else {
        space += 2;
    }

    if (markWidthPtr)
        *markWidthPtr = markWidth;

    space += 4;

    if (d->m_codeFoldingVisible)
        space += foldBoxWidth(fm);
    return space;
}

void BaseTextEditorWidget::slotUpdateExtraAreaWidth()
{
    if (isLeftToRight())
        setViewportMargins(extraAreaWidth(), 0, 0, 0);
    else
        setViewportMargins(0, 0, extraAreaWidth(), 0);
}

static void drawRectBox(QPainter *painter, const QRect &rect, bool start, bool end,
                        const QPalette &pal)
{
    painter->save();
    painter->setRenderHint(QPainter::Antialiasing, false);

    QRgb b = pal.base().color().rgb();
    QRgb h = pal.highlight().color().rgb();
    QColor c = Utils::StyleHelper::mergedColors(b,h, 50);

    QLinearGradient grad(rect.topLeft(), rect.topRight());
    grad.setColorAt(0, c.lighter(110));
    grad.setColorAt(1, c.lighter(130));
    QColor outline = c;

    painter->fillRect(rect, grad);
    painter->setPen(outline);
    if (start)
        painter->drawLine(rect.topLeft() + QPoint(1, 0), rect.topRight() -  QPoint(1, 0));
    if (end)
        painter->drawLine(rect.bottomLeft() + QPoint(1, 0), rect.bottomRight() -  QPoint(1, 0));

    painter->drawLine(rect.topRight() + QPoint(0, start ? 1 : 0), rect.bottomRight() - QPoint(0, end ? 1 : 0));
    painter->drawLine(rect.topLeft() + QPoint(0, start ? 1 : 0), rect.bottomLeft() - QPoint(0, end ? 1 : 0));

    painter->restore();
}

void BaseTextEditorWidget::extraAreaPaintEvent(QPaintEvent *e)
{
    QTextDocument *doc = document();
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);

    int selStart = textCursor().selectionStart();
    int selEnd = textCursor().selectionEnd();

    QPalette pal = d->m_extraArea->palette();
    pal.setCurrentColorGroup(QPalette::Active);
    QPainter painter(d->m_extraArea);
    const QFontMetrics fm(d->m_extraArea->font());
    int fmLineSpacing = fm.lineSpacing();

    int markWidth = 0;
    if (d->m_marksVisible)
        markWidth += fm.lineSpacing();

    const int collapseColumnWidth = d->m_codeFoldingVisible ? foldBoxWidth(fm): 0;
    const int extraAreaWidth = d->m_extraArea->width() - collapseColumnWidth;

    painter.fillRect(e->rect(), pal.color(QPalette::Background));

    QTextBlock block = firstVisibleBlock();
    int blockNumber = block.blockNumber();
    qreal top = blockBoundingGeometry(block).translated(contentOffset()).top();
    qreal bottom = top;

    while (block.isValid() && top <= e->rect().bottom()) {

        top = bottom;
        const qreal height = blockBoundingRect(block).height();
        bottom = top + height;
        QTextBlock nextBlock = block.next();

        QTextBlock nextVisibleBlock = nextBlock;
        int nextVisibleBlockNumber = blockNumber + 1;

        if (!nextVisibleBlock.isVisible()) {
            // invisible blocks do have zero line count
            nextVisibleBlock = doc->findBlockByLineNumber(nextVisibleBlock.firstLineNumber());
            nextVisibleBlockNumber = nextVisibleBlock.blockNumber();
        }

        if (bottom < e->rect().top()) {
            block = nextVisibleBlock;
            blockNumber = nextVisibleBlockNumber;
            continue;
        }

        painter.setPen(pal.color(QPalette::Dark));

        if (d->m_codeFoldingVisible || d->m_marksVisible) {
            painter.save();
            painter.setRenderHint(QPainter::Antialiasing, false);

            if (TextBlockUserData *userData = static_cast<TextBlockUserData*>(block.userData())) {
                if (d->m_marksVisible) {
                    int xoffset = 0;
                    foreach (ITextMark *mark, userData->marks()) {
                        if (!mark->visible())
                            continue;
                        const int height = fmLineSpacing - 1;
                        const int width = int(.5 + height * mark->widthFactor());
                        const QRect r(xoffset, top, width, height);
                        mark->paint(&painter, r);
                        xoffset += 2;
                    }
                }
            }

            if (d->m_codeFoldingVisible) {

                int extraAreaHighlightFoldBlockNumber = -1;
                int extraAreaHighlightFoldEndBlockNumber = -1;
                bool endIsVisible = false;
                if (!d->m_highlightBlocksInfo.isEmpty()) {
                    extraAreaHighlightFoldBlockNumber =  d->m_highlightBlocksInfo.open.last();
                    extraAreaHighlightFoldEndBlockNumber =  d->m_highlightBlocksInfo.close.first();
                    endIsVisible = doc->findBlockByNumber(extraAreaHighlightFoldEndBlockNumber).isVisible();

//                    QTextBlock before = doc->findBlockByNumber(extraAreaHighlightCollapseBlockNumber-1);
//                    if (TextBlockUserData::hasCollapseAfter(before)) {
//                        extraAreaHighlightCollapseBlockNumber--;
//                    }
                }

                TextBlockUserData *nextBlockUserData = BaseTextDocumentLayout::testUserData(nextBlock);

                bool drawBox = nextBlockUserData
                               && BaseTextDocumentLayout::foldingIndent(block) < nextBlockUserData->foldingIndent();



                bool active = blockNumber == extraAreaHighlightFoldBlockNumber;

                bool drawStart = active;
                bool drawEnd = blockNumber == extraAreaHighlightFoldEndBlockNumber || (drawStart && !endIsVisible);
                bool hovered = blockNumber >= extraAreaHighlightFoldBlockNumber
                               && blockNumber <= extraAreaHighlightFoldEndBlockNumber;

                int boxWidth = foldBoxWidth(fm);
                if (hovered) {
                    int itop = qRound(top);
                    int ibottom = qRound(bottom);
                    QRect box = QRect(extraAreaWidth + 1, itop, boxWidth - 2, ibottom - itop);
                    drawRectBox(&painter, box, drawStart, drawEnd, pal);
                }

                if (drawBox) {
                    bool expanded = nextBlock.isVisible();
                    int size = boxWidth/4;
                    QRect box(extraAreaWidth + size, top + size,
                              2 * (size) + 1, 2 * (size) + 1);
                    drawFoldingMarker(&painter, pal, box, expanded, active, hovered);
                }
            }

            painter.restore();
        }


        if (d->m_revisionsVisible && block.revision() != documentLayout->lastSaveRevision) {
            painter.save();
            painter.setRenderHint(QPainter::Antialiasing, false);
            if (block.revision() < 0)
                painter.setPen(QPen(Qt::darkGreen, 2));
            else
                painter.setPen(QPen(Qt::red, 2));
            painter.drawLine(extraAreaWidth - 1, top, extraAreaWidth - 1, bottom - 1);
            painter.restore();
        }

        if (d->m_lineNumbersVisible) {
            const QString &number = QString::number(blockNumber + 1);
            bool selected = (
                    (selStart < block.position() + block.length()

                    && selEnd > block.position())
                    || (selStart == selEnd && selStart == block.position())
                    );
            if (selected) {
                painter.save();
                QFont f = painter.font();
                f.setBold(d->m_currentLineNumberFormat.font().bold());
                f.setItalic(d->m_currentLineNumberFormat.font().italic());
                painter.setFont(f);
                painter.setPen(d->m_currentLineNumberFormat.foreground().color());
            }
            painter.drawText(QRectF(markWidth, top, extraAreaWidth - markWidth - 4, height), Qt::AlignRight, number);
            if (selected)
                painter.restore();
        }

        block = nextVisibleBlock;
        blockNumber = nextVisibleBlockNumber;
    }
}

void BaseTextEditorWidget::drawFoldingMarker(QPainter *painter, const QPalette &pal,
                                       const QRect &rect,
                                       bool expanded,
                                       bool active,
                                       bool hovered) const
{
    Q_UNUSED(active)
    Q_UNUSED(hovered)
    QStyle *s = style();
    if (ManhattanStyle *ms = qobject_cast<ManhattanStyle*>(s))
        s = ms->baseStyle();

    if (!qstrcmp(s->metaObject()->className(), "OxygenStyle")) {
        painter->save();
        painter->setPen(Qt::NoPen);
        int size = rect.size().width();
        int sqsize = 2*(size/2);

        QColor textColor = pal.buttonText().color();
        QColor brushColor = textColor;

        textColor.setAlpha(100);
        brushColor.setAlpha(100);

        QPolygon a;
        if (expanded) {
            // down arrow
            a.setPoints(3, 0, sqsize/3,  sqsize/2, sqsize  - sqsize/3,  sqsize, sqsize/3);
        } else {
            // right arrow
            a.setPoints(3, sqsize - sqsize/3, sqsize/2,  sqsize/2 - sqsize/3, 0,  sqsize/2 - sqsize/3, sqsize);
            painter->setBrush(brushColor);
        }
        painter->translate(0.5, 0.5);
        painter->setRenderHint(QPainter::Antialiasing);
        painter->translate(rect.topLeft());
        painter->setPen(textColor);
        painter->setBrush(textColor);
        painter->drawPolygon(a);
        painter->restore();
    } else {
        QStyleOptionViewItemV2 opt;
        opt.rect = rect;
        opt.state = QStyle::State_Active | QStyle::State_Item | QStyle::State_Children;
        if (expanded)
            opt.state |= QStyle::State_Open;
        if (active)
            opt.state |= QStyle::State_MouseOver | QStyle::State_Enabled | QStyle::State_Selected;
        if (hovered)
            opt.palette.setBrush(QPalette::Window, pal.highlight());

         // QGtkStyle needs a small correction to draw the marker in the right place
        if (!qstrcmp(s->metaObject()->className(), "QGtkStyle"))
           opt.rect.translate(-2, 0);
        else if (!qstrcmp(s->metaObject()->className(), "QMacStyle"))
            opt.rect.translate(-1, 0);

        s->drawPrimitive(QStyle::PE_IndicatorBranch, &opt, painter, this);
    }
}

void BaseTextEditorWidget::slotModificationChanged(bool m)
{
    if (m)
        return;

    QTextDocument *doc = document();
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);
    int oldLastSaveRevision = documentLayout->lastSaveRevision;
    documentLayout->lastSaveRevision = doc->revision();

    if (oldLastSaveRevision != documentLayout->lastSaveRevision) {
        QTextBlock block = doc->begin();
        while (block.isValid()) {
            if (block.revision() < 0 || block.revision() != oldLastSaveRevision) {
                block.setRevision(-documentLayout->lastSaveRevision - 1);
            } else {
                block.setRevision(documentLayout->lastSaveRevision);
            }
            block = block.next();
        }
    }
    d->m_extraArea->update();
}

void BaseTextEditorWidget::slotUpdateRequest(const QRect &r, int dy)
{
    if (dy)
        d->m_extraArea->scroll(0, dy);
    else if (r.width() > 4) { // wider than cursor width, not just cursor blinking
        d->m_extraArea->update(0, r.y(), d->m_extraArea->width(), r.height());
        if (!d->m_searchExpr.isEmpty()) {
            const int m = d->m_searchResultOverlay->dropShadowWidth();
            viewport()->update(r.adjusted(-m, -m, m, m));
        }
    }

    if (r.contains(viewport()->rect()))
        slotUpdateExtraAreaWidth();
}

void BaseTextEditorWidget::saveCurrentCursorPositionForNavigation()
{
    d->m_lastCursorChangeWasInteresting = true;
    d->m_tempNavigationState = saveState();
}

void BaseTextEditorWidget::updateCurrentLineHighlight()
{
    QList<QTextEdit::ExtraSelection> extraSelections;

    if (d->m_highlightCurrentLine) {
        QTextEdit::ExtraSelection sel;
        sel.format.setBackground(d->m_currentLineFormat.background());
        sel.format.setProperty(QTextFormat::FullWidthSelection, true);
        sel.cursor = textCursor();
        sel.cursor.clearSelection();
        extraSelections.append(sel);
    }

    setExtraSelections(CurrentLineSelection, extraSelections);


    // the extra area shows information for the entire current block, not just the currentline.
    // This is why we must force a bigger update region.
    int cursorBlockNumber = textCursor().blockNumber();
    if (cursorBlockNumber != d->m_cursorBlockNumber) {
        QPointF offset = contentOffset();
        QTextBlock block = document()->findBlockByNumber(d->m_cursorBlockNumber);
        if (block.isValid())
            d->m_extraArea->update(blockBoundingGeometry(block).translated(offset).toAlignedRect());
        block = document()->findBlockByNumber(cursorBlockNumber);
        if (block.isValid() && block.isVisible())
            d->m_extraArea->update(blockBoundingGeometry(block).translated(offset).toAlignedRect());
        d->m_cursorBlockNumber = cursorBlockNumber;
    }

}

void BaseTextEditorWidget::slotCursorPositionChanged()
{
#if 0
    qDebug() << "block" << textCursor().blockNumber()+1
            << "brace depth:" << BaseTextDocumentLayout::braceDepth(textCursor().block())
            << "indent:" << BaseTextDocumentLayout::userData(textCursor().block())->foldingIndent();
#endif
    if (!d->m_contentsChanged && d->m_lastCursorChangeWasInteresting) {
        Core::EditorManager::instance()->addCurrentPositionToNavigationHistory(editor(), d->m_tempNavigationState);
        d->m_lastCursorChangeWasInteresting = false;
    } else if (d->m_contentsChanged) {
        saveCurrentCursorPositionForNavigation();
    }

    updateHighlights();
}

void BaseTextEditorWidget::updateHighlights()
{
    if (d->m_parenthesesMatchingEnabled && hasFocus()) {
        // Delay update when no matching is displayed yet, to avoid flicker
        if (extraSelections(ParenthesesMatchingSelection).isEmpty()
            && d->m_animator == 0) {
            d->m_parenthesesMatchingTimer->start(50);
        } else {
             // use 0-timer, not direct call, to give the syntax highlighter a chance
            // to update the parantheses information
            d->m_parenthesesMatchingTimer->start(0);
        }
    }

    updateCurrentLineHighlight();

    if (d->m_displaySettings.m_highlightBlocks) {
        QTextCursor cursor = textCursor();
        d->extraAreaHighlightFoldedBlockNumber = cursor.blockNumber();
        d->m_highlightBlocksTimer->start(100);
    }
}

void BaseTextEditorWidget::slotUpdateBlockNotify(const QTextBlock &block)
{
    static bool blockRecursion = false;
    if (blockRecursion)
        return;
    blockRecursion = true;
    if (d->m_overlay->isVisible()) {
        /* an overlay might draw outside the block bounderies, force
           complete viewport update */
        viewport()->update();
    } else {
        if (block.previous().isValid() && block.userState() != block.previous().userState()) {
        /* The syntax highlighting state changes. This opens up for
           the possibility that the paragraph has braces that support
           code folding. In this case, do the save thing and also
           update the previous block, which might contain a fold
           box which now is invalid.*/
            emit requestBlockUpdate(block.previous());
        }
        if (!d->m_findScopeStart.isNull()) {
            if (block.position() < d->m_findScopeEnd.position()
                && block.position()+block.length() >= d->m_findScopeStart.position()) {
                QTextBlock b = block.document()->findBlock(d->m_findScopeStart.position());
                do {
                    emit requestBlockUpdate(b);
                    b = b.next();
                } while (b.isValid() && b.position() < d->m_findScopeEnd.position());
            }
        }
    }
    blockRecursion = false;
}

void BaseTextEditorWidget::timerEvent(QTimerEvent *e)
{
    if (e->timerId() == d->autoScrollTimer.timerId()) {
        const QPoint globalPos = QCursor::pos();
        const QPoint pos = d->m_extraArea->mapFromGlobal(globalPos);
        QRect visible = d->m_extraArea->rect();
        verticalScrollBar()->triggerAction( pos.y() < visible.center().y() ?
                                            QAbstractSlider::SliderSingleStepSub
                                            : QAbstractSlider::SliderSingleStepAdd);
        QMouseEvent ev(QEvent::MouseMove, pos, globalPos, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
        extraAreaMouseEvent(&ev);
        int delta = qMax(pos.y() - visible.top(), visible.bottom() - pos.y()) - visible.height();
        if (delta < 7)
            delta = 7;
        int timeout = 4900 / (delta * delta);
        d->autoScrollTimer.start(timeout, this);

    } else if (e->timerId() == d->foldedBlockTimer.timerId()) {
        d->visibleFoldedBlockNumber = d->suggestedVisibleFoldedBlockNumber;
        d->suggestedVisibleFoldedBlockNumber = -1;
        d->foldedBlockTimer.stop();
        viewport()->update();
    }
    QPlainTextEdit::timerEvent(e);
}


void BaseTextEditorPrivate::clearVisibleFoldedBlock()
{
    if (suggestedVisibleFoldedBlockNumber) {
        suggestedVisibleFoldedBlockNumber = -1;
        foldedBlockTimer.stop();
    }
    if (visibleFoldedBlockNumber >= 0) {
        visibleFoldedBlockNumber = -1;
        q->viewport()->update();
    }
}

void BaseTextEditorWidget::mouseMoveEvent(QMouseEvent *e)
{
    updateLink(e);

    if (e->buttons() == Qt::NoButton) {
        const QTextBlock collapsedBlock = foldedBlockAt(e->pos());
        const int blockNumber = collapsedBlock.next().blockNumber();
        if (blockNumber < 0) {
            d->clearVisibleFoldedBlock();
        } else if (blockNumber != d->visibleFoldedBlockNumber) {
            d->suggestedVisibleFoldedBlockNumber = blockNumber;
            d->foldedBlockTimer.start(40, this);
        }

        const RefactorMarker refactorMarker = d->m_refactorOverlay->markerAt(e->pos());

        // Update the mouse cursor
        if ((collapsedBlock.isValid() || refactorMarker.isValid()) && !d->m_mouseOnFoldedMarker) {
            d->m_mouseOnFoldedMarker = true;
            viewport()->setCursor(Qt::PointingHandCursor);
        } else if (!collapsedBlock.isValid() && !refactorMarker.isValid() && d->m_mouseOnFoldedMarker) {
            d->m_mouseOnFoldedMarker = false;
            viewport()->setCursor(Qt::IBeamCursor);
        }
    } else {
        QPlainTextEdit::mouseMoveEvent(e);

        if (e->modifiers() & Qt::AltModifier) {
            if (!d->m_inBlockSelectionMode) {
                d->m_blockSelection.fromSelection(tabSettings(), textCursor());
                d->m_inBlockSelectionMode = true;
            } else {
                QTextCursor cursor = textCursor();

                // get visual column
                int column = tabSettings().columnAt(cursor.block().text(), cursor.positionInBlock());
                if (cursor.positionInBlock() == cursor.block().length()-1) {
                    column += (e->pos().x() - cursorRect().center().x())/QFontMetricsF(font()).width(QLatin1Char(' '));
                }
                d->m_blockSelection.moveAnchor(cursor.blockNumber(), column);
                setTextCursor(d->m_blockSelection.selection(tabSettings()));
                viewport()->update();
            }
        }
    }
    if (viewport()->cursor().shape() == Qt::BlankCursor)
        viewport()->setCursor(Qt::IBeamCursor);
}

static bool handleForwardBackwardMouseButtons(QMouseEvent *e)
{
    if (e->button() == Qt::XButton1) {
        Core::EditorManager::instance()->goBackInNavigationHistory();
        return true;
    }
    if (e->button() == Qt::XButton2) {
        Core::EditorManager::instance()->goForwardInNavigationHistory();
        return true;
    }

    return false;
}

void BaseTextEditorWidget::mousePressEvent(QMouseEvent *e)
{
    if (e->button() == Qt::LeftButton) {
        d->clearBlockSelection(); // just in case, otherwise we might get strange drag and drop

        QTextBlock foldedBlock = foldedBlockAt(e->pos());
        if (foldedBlock.isValid()) {
            toggleBlockVisible(foldedBlock);
            viewport()->setCursor(Qt::IBeamCursor);
        }

        RefactorMarker refactorMarker = d->m_refactorOverlay->markerAt(e->pos());
        if (refactorMarker.isValid()) {
            emit refactorMarkerClicked(refactorMarker);
        } else {
            updateLink(e);

            if (d->m_currentLink.isValid())
                d->m_linkPressed = true;
        }
    } else if (e->button() == Qt::RightButton) {
        int eventCursorPosition = cursorForPosition(e->pos()).position();
        if (eventCursorPosition < textCursor().selectionStart()
                || eventCursorPosition > textCursor().selectionEnd()) {
            setTextCursor(cursorForPosition(e->pos()));
        }
    }

#ifdef Q_OS_LINUX
    if (handleForwardBackwardMouseButtons(e))
        return;
#endif

    QPlainTextEdit::mousePressEvent(e);
}

void BaseTextEditorWidget::mouseReleaseEvent(QMouseEvent *e)
{
    if (mouseNavigationEnabled()
        && d->m_linkPressed
        && e->modifiers() & Qt::ControlModifier
        && !(e->modifiers() & Qt::ShiftModifier)
        && e->button() == Qt::LeftButton
        ) {
        const QTextCursor cursor = cursorForPosition(e->pos());
        if (openLink(findLinkAt(cursor))) {
            clearLink();
            return;
        }
    }

#ifndef Q_OS_LINUX
    if (handleForwardBackwardMouseButtons(e))
        return;
#endif

    QPlainTextEdit::mouseReleaseEvent(e);
}

void BaseTextEditorWidget::mouseDoubleClickEvent(QMouseEvent *e)
{
    QTextCursor cursor = textCursor();
    const int position = cursor.position();
    if (TextBlockUserData::findPreviousOpenParenthesis(&cursor, false, true)) {
        if (position - cursor.position() == 1 && selectBlockUp())
            return;
    }

    QPlainTextEdit::mouseDoubleClickEvent(e);
}

void BaseTextEditorWidget::leaveEvent(QEvent *e)
{
    // Clear link emulation when the mouse leaves the editor
    clearLink();
    QPlainTextEdit::leaveEvent(e);
}

void BaseTextEditorWidget::keyReleaseEvent(QKeyEvent *e)
{
    if (e->key() == Qt::Key_Control) {
        clearLink();
    } else if (e->key() == Qt::Key_Shift
             && d->m_behaviorSettings.m_constrainHoverTooltips
             && ToolTip::instance()->isVisible()) {
        ToolTip::instance()->hide();
    } else if (e->key() == Qt::Key_Alt
               && d->m_maybeFakeTooltipEvent) {
        d->m_maybeFakeTooltipEvent = false;
        processTooltipRequest(textCursor());
    }

    QPlainTextEdit::keyReleaseEvent(e);
}

void BaseTextEditorWidget::dragEnterEvent(QDragEnterEvent *e)
{
    // If the drag event contains URLs, we don't want to insert them as text
    if (e->mimeData()->hasUrls()) {
        e->ignore();
        return;
    }

    QPlainTextEdit::dragEnterEvent(e);
}

void BaseTextEditorWidget::extraAreaLeaveEvent(QEvent *)
{
    // fake missing mouse move event from Qt
    QMouseEvent me(QEvent::MouseMove, QPoint(-1, -1), Qt::NoButton, 0, 0);
    extraAreaMouseEvent(&me);
}

void BaseTextEditorWidget::extraAreaContextMenuEvent(QContextMenuEvent *e)
{
    QTextCursor cursor = cursorForPosition(QPoint(0, e->pos().y()));
    if (d->m_marksVisible) {
        QMenu * contextMenu = new QMenu(this);
        emit editor()->markContextMenuRequested(editor(), cursor.blockNumber() + 1, contextMenu);
        if (!contextMenu->isEmpty())
            contextMenu->exec(e->globalPos());
        delete contextMenu;
        e->accept();
    }
}

void BaseTextEditorWidget::extraAreaMouseEvent(QMouseEvent *e)
{
    QTextCursor cursor = cursorForPosition(QPoint(0, e->pos().y()));

    int markWidth;
    extraAreaWidth(&markWidth);

    if (d->m_codeFoldingVisible
        && e->type() == QEvent::MouseMove && e->buttons() == 0) { // mouse tracking
        // Update which folder marker is highlighted
        const int highlightBlockNumber = d->extraAreaHighlightFoldedBlockNumber;
        d->extraAreaHighlightFoldedBlockNumber = -1;

        if (e->pos().x() > extraArea()->width() - foldBoxWidth(fontMetrics())) {
            d->extraAreaHighlightFoldedBlockNumber = cursor.blockNumber();
        } else if (d->m_displaySettings.m_highlightBlocks) {
            QTextCursor cursor = textCursor();
            d->extraAreaHighlightFoldedBlockNumber = cursor.blockNumber();
        }

        if (highlightBlockNumber != d->extraAreaHighlightFoldedBlockNumber)
            d->m_highlightBlocksTimer->start(d->m_highlightBlocksInfo.isEmpty() ? 120 : 0);
        }

    // Set whether the mouse cursor is a hand or normal arrow
    if (e->type() == QEvent::MouseMove) {
        bool hand = (e->pos().x() <= markWidth);
        if (hand != (d->m_extraArea->cursor().shape() == Qt::PointingHandCursor))
            d->m_extraArea->setCursor(hand ? Qt::PointingHandCursor : Qt::ArrowCursor);
    }

    if (e->type() == QEvent::MouseButtonPress || e->type() == QEvent::MouseButtonDblClick) {
        if (e->button() == Qt::LeftButton) {
            int boxWidth = foldBoxWidth(fontMetrics());
            if (d->m_codeFoldingVisible && e->pos().x() > extraArea()->width() - boxWidth) {
                if (!cursor.block().next().isVisible()) {
                    toggleBlockVisible(cursor.block());
                    d->moveCursorVisible(false);
                } else if (foldBox().contains(e->pos())) {
                    cursor.setPosition(
                            document()->findBlockByNumber(d->m_highlightBlocksInfo.open.last()).position()
                            );
                    QTextBlock c = cursor.block();
                    toggleBlockVisible(c);
                    d->moveCursorVisible(false);
                }
            } else if (d->m_lineNumbersVisible && e->pos().x() > markWidth) {
                QTextCursor selection = cursor;
                selection.setVisualNavigation(true);
                d->extraAreaSelectionAnchorBlockNumber = selection.blockNumber();
                selection.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
                selection.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor);
                setTextCursor(selection);
            } else {
                d->extraAreaToggleMarkBlockNumber = cursor.blockNumber();
            }
        }
    } else if (d->extraAreaSelectionAnchorBlockNumber >= 0) {
        QTextCursor selection = cursor;
        selection.setVisualNavigation(true);
        if (e->type() == QEvent::MouseMove) {
            QTextBlock anchorBlock = document()->findBlockByNumber(d->extraAreaSelectionAnchorBlockNumber);
            selection.setPosition(anchorBlock.position());
            if (cursor.blockNumber() < d->extraAreaSelectionAnchorBlockNumber) {
                selection.movePosition(QTextCursor::EndOfBlock);
                selection.movePosition(QTextCursor::Right);
            }
            selection.setPosition(cursor.block().position(), QTextCursor::KeepAnchor);
            if (cursor.blockNumber() >= d->extraAreaSelectionAnchorBlockNumber) {
                selection.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
                selection.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor);
            }

            if (e->pos().y() >= 0 && e->pos().y() <= d->m_extraArea->height())
                d->autoScrollTimer.stop();
            else if (!d->autoScrollTimer.isActive())
                d->autoScrollTimer.start(100, this);

        } else {
            d->autoScrollTimer.stop();
            d->extraAreaSelectionAnchorBlockNumber = -1;
            return;
        }
        setTextCursor(selection);
    } else if (d->extraAreaToggleMarkBlockNumber >= 0 && d->m_marksVisible && d->m_requestMarkEnabled) {
        if (e->type() == QEvent::MouseButtonRelease && e->button() == Qt::LeftButton) {
            int n = d->extraAreaToggleMarkBlockNumber;
            d->extraAreaToggleMarkBlockNumber = -1;
            if (cursor.blockNumber() == n) {
                int line = n + 1;
                ITextEditor::MarkRequestKind kind;
                if (QApplication::keyboardModifiers() & Qt::ShiftModifier)
                    kind = ITextEditor::BookmarkRequest;
                else
                    kind = ITextEditor::BreakpointRequest;
                emit editor()->markRequested(editor(), line, kind);
            }
        }
    }
}

void BaseTextEditorWidget::ensureCursorVisible()
{
    QTextBlock block = textCursor().block();
    if (!block.isVisible()) {
        while (!block.isVisible() && block.previous().isValid())
            block = block.previous();
        toggleBlockVisible(block);
    }
    QPlainTextEdit::ensureCursorVisible();
}

void BaseTextEditorWidget::toggleBlockVisible(const QTextBlock &block)
{
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(document()->documentLayout());
    QTC_ASSERT(documentLayout, return);

    bool visible = block.next().isVisible();
    BaseTextDocumentLayout::doFoldOrUnfold(block, !visible);
    documentLayout->requestUpdate();
    documentLayout->emitDocumentSizeChanged();
}


const TabSettings &BaseTextEditorWidget::tabSettings() const
{
    return d->m_document->tabSettings();
}

void BaseTextEditorWidget::setLanguageSettingsId(const QString &settingsId)
{
    d->m_tabSettingsId = settingsId;
}

QString BaseTextEditorWidget::languageSettingsId() const
{
    return d->m_tabSettingsId;
}

void BaseTextEditorWidget::setCodeStyle(ICodeStylePreferences *preferences)
{
    indenter()->setCodeStylePreferences(preferences);
    if (d->m_codeStylePreferences) {
        disconnect(d->m_codeStylePreferences, SIGNAL(currentTabSettingsChanged(TextEditor::TabSettings)),
                this, SLOT(setTabSettings(TextEditor::TabSettings)));
        disconnect(d->m_codeStylePreferences, SIGNAL(currentValueChanged(QVariant)),
                this, SLOT(slotCodeStyleSettingsChanged(QVariant)));
        disconnect(d->m_codeStylePreferences, SIGNAL(destroyed()),
                   this, SLOT(onCodeStylePreferencesDestroyed()));
    }
    d->m_codeStylePreferences = preferences;
    if (d->m_codeStylePreferences) {
        connect(d->m_codeStylePreferences, SIGNAL(currentTabSettingsChanged(TextEditor::TabSettings)),
                this, SLOT(setTabSettings(TextEditor::TabSettings)));
        connect(d->m_codeStylePreferences, SIGNAL(currentValueChanged(QVariant)),
                this, SLOT(slotCodeStyleSettingsChanged(QVariant)));
        connect(d->m_codeStylePreferences, SIGNAL(destroyed()),
                this, SLOT(onCodeStylePreferencesDestroyed()));
        setTabSettings(d->m_codeStylePreferences->currentTabSettings());
        slotCodeStyleSettingsChanged(d->m_codeStylePreferences->currentValue());
    }
}

void BaseTextEditorWidget::onCodeStylePreferencesDestroyed()
{
    if (sender() != d->m_codeStylePreferences)
        return;
    // avoid failing disconnects, m_codeStylePreferences has already been reduced to QObject
    d->m_codeStylePreferences = 0;
    setCodeStyle(TextEditorSettings::instance()->codeStyle(languageSettingsId()));
}

void BaseTextEditorWidget::slotCodeStyleSettingsChanged(const QVariant &)
{

}

const DisplaySettings &BaseTextEditorWidget::displaySettings() const
{
    return d->m_displaySettings;
}


void BaseTextEditorWidget::indentOrUnindent(bool doIndent)
{
    const TextEditor::TabSettings &tabSettings = d->m_document->tabSettings();

    QTextCursor cursor = textCursor();
    maybeClearSomeExtraSelections(cursor);
    cursor.beginEditBlock();

    if (cursor.hasSelection()) {
        // Indent or unindent the selected lines
        int pos = cursor.position();
        int anchor = cursor.anchor();
        int start = qMin(anchor, pos);
        int end = qMax(anchor, pos);

        QTextDocument *doc = document();
        QTextBlock startBlock = doc->findBlock(start);
        QTextBlock endBlock = doc->findBlock(end-1).next();

        if (startBlock.next() == endBlock
                && (start > startBlock.position() || end < endBlock.position() - 1)) {
            // Only one line partially selected.
            cursor.removeSelectedText();
        } else {
            for (QTextBlock block = startBlock; block != endBlock; block = block.next()) {
                QString text = block.text();
                int indentPosition = tabSettings.lineIndentPosition(text);
                if (!doIndent && !indentPosition)
                    indentPosition = tabSettings.firstNonSpace(text);
                int targetColumn = tabSettings.indentedColumn(tabSettings.columnAt(text, indentPosition), doIndent);
                cursor.setPosition(block.position() + indentPosition);
                cursor.insertText(tabSettings.indentationString(0, targetColumn, block));
                cursor.setPosition(block.position());
                cursor.setPosition(block.position() + indentPosition, QTextCursor::KeepAnchor);
                cursor.removeSelectedText();
            }
            cursor.endEditBlock();
            return;
        }
    }

    // Indent or unindent at cursor position
    QTextBlock block = cursor.block();
    QString text = block.text();
    int indentPosition = cursor.positionInBlock();
    int spaces = tabSettings.spacesLeftFromPosition(text, indentPosition);
    int startColumn = tabSettings.columnAt(text, indentPosition - spaces);
    int targetColumn = tabSettings.indentedColumn(tabSettings.columnAt(text, indentPosition), doIndent);
    cursor.setPosition(block.position() + indentPosition);
    cursor.setPosition(block.position() + indentPosition - spaces, QTextCursor::KeepAnchor);
    cursor.removeSelectedText();
    cursor.insertText(tabSettings.indentationString(startColumn, targetColumn, block));
    cursor.endEditBlock();
    setTextCursor(cursor);
}

void BaseTextEditorWidget::handleHomeKey(bool anchor)
{
    QTextCursor cursor = textCursor();
    QTextCursor::MoveMode mode = QTextCursor::MoveAnchor;

    if (anchor)
        mode = QTextCursor::KeepAnchor;

    const int initpos = cursor.position();
    int pos = cursor.block().position();
    QChar character = characterAt(pos);
    const QLatin1Char tab = QLatin1Char('\t');

    while (character == tab || character.category() == QChar::Separator_Space) {
        ++pos;
        if (pos == initpos)
            break;
        character = characterAt(pos);
    }

    // Go to the start of the block when we're already at the start of the text
    if (pos == initpos)
        pos = cursor.block().position();

    cursor.setPosition(pos, mode);
    setTextCursor(cursor);
}

void BaseTextEditorWidget::handleBackspaceKey()
{
    QTextCursor cursor = textCursor();
    QTC_ASSERT(!cursor.hasSelection(), return);

    const int pos = cursor.position();
    if (!pos)
        return;

    bool cursorWithinSnippet = false;
    if (d->m_snippetOverlay->isVisible()) {
        QTextCursor snippetCursor = cursor;
        snippetCursor.movePosition(QTextCursor::Left);
        cursorWithinSnippet = d->snippetCheckCursor(snippetCursor);
    }

    const TextEditor::TabSettings &tabSettings = d->m_document->tabSettings();
    const TextEditor::TypingSettings &typingSettings = d->m_document->typingSettings();

    if (typingSettings.m_autoIndent && d->m_autoCompleter->autoBackspace(cursor))
        return;

    bool handled = false;
    if (typingSettings.m_smartBackspaceBehavior == TypingSettings::BackspaceNeverIndents) {
        if (cursorWithinSnippet)
            cursor.beginEditBlock();
        cursor.deletePreviousChar();
        handled = true;
    } else if (typingSettings.m_smartBackspaceBehavior == TypingSettings::BackspaceFollowsPreviousIndents) {
        QTextBlock currentBlock = cursor.block();
        int positionInBlock = pos - currentBlock.position();
        const QString blockText = currentBlock.text();
        if (cursor.atBlockStart() || tabSettings.firstNonSpace(blockText) < positionInBlock) {
            if (cursorWithinSnippet)
                cursor.beginEditBlock();
            cursor.deletePreviousChar();
            handled = true;
        } else {
            if (cursorWithinSnippet) {
                d->m_snippetOverlay->clear();
                cursorWithinSnippet = false;
            }
            int previousIndent = 0;
            const int indent = tabSettings.columnAt(blockText, positionInBlock);
            for (QTextBlock previousNonEmptyBlock = currentBlock.previous();
                 previousNonEmptyBlock.isValid();
                 previousNonEmptyBlock = previousNonEmptyBlock.previous()) {
                QString previousNonEmptyBlockText = previousNonEmptyBlock.text();
                if (previousNonEmptyBlockText.trimmed().isEmpty())
                    continue;
                previousIndent =
                        tabSettings.columnAt(previousNonEmptyBlockText,
                                             tabSettings.firstNonSpace(previousNonEmptyBlockText));
                if (previousIndent < indent) {
                    cursor.beginEditBlock();
                    cursor.setPosition(currentBlock.position(), QTextCursor::KeepAnchor);
                    cursor.insertText(tabSettings.indentationString(previousNonEmptyBlockText));
                    cursor.endEditBlock();
                    handled = true;
                    break;
                }
            }
        }
    } else if (typingSettings.m_smartBackspaceBehavior == TypingSettings::BackspaceUnindents) {
        const QChar &c = characterAt(pos - 1);
        if (!(c == QLatin1Char(' ') || c == QLatin1Char('\t'))) {
            if (cursorWithinSnippet)
                cursor.beginEditBlock();
            cursor.deletePreviousChar();
        } else {
            if (cursorWithinSnippet) {
                d->m_snippetOverlay->clear();
                cursorWithinSnippet = false;
            }
            indentOrUnindent(false);
        }
        handled = true;
    }

    if (!handled) {
        if (cursorWithinSnippet)
            cursor.beginEditBlock();
        cursor.deletePreviousChar();
    }

    if (cursorWithinSnippet) {
        cursor.endEditBlock();
        d->m_snippetOverlay->updateEquivalentSelections(cursor);
    }

    setTextCursor(cursor);
}

void BaseTextEditorWidget::wheelEvent(QWheelEvent *e)
{
    d->clearVisibleFoldedBlock();
    if (scrollWheelZoomingEnabled() && e->modifiers() & Qt::ControlModifier) {
        const int delta = e->delta();
        if (delta < 0)
            zoomOut();
        else if (delta > 0)
            zoomIn();
        return;
    }
    QPlainTextEdit::wheelEvent(e);
}

void BaseTextEditorWidget::zoomIn(int range)
{
    d->clearVisibleFoldedBlock();
    emit requestFontZoom(range*10);
}

void BaseTextEditorWidget::zoomOut(int range)
{
    zoomIn(-range);
}

void BaseTextEditorWidget::zoomReset()
{
    emit requestZoomReset();
}

void BaseTextEditorWidget::indentInsertedText(const QTextCursor &tc)
{
    indent(tc.document(), tc, QChar::Null);
}

void BaseTextEditorWidget::indent(QTextDocument *doc, const QTextCursor &cursor, QChar typedChar)
{
    maybeClearSomeExtraSelections(cursor);
    d->m_indenter->indent(doc, cursor, typedChar, tabSettings());
}

void BaseTextEditorWidget::reindent(QTextDocument *doc, const QTextCursor &cursor)
{
    maybeClearSomeExtraSelections(cursor);
    d->m_indenter->reindent(doc, cursor, tabSettings());
}

BaseTextEditorWidget::Link BaseTextEditorWidget::findLinkAt(const QTextCursor &, bool)
{
    return Link();
}

bool BaseTextEditorWidget::openLink(const Link &link)
{
    if (link.fileName.isEmpty())
        return false;

    if (baseTextDocument()->fileName() == link.fileName) {
        Core::EditorManager *editorManager = Core::EditorManager::instance();
        editorManager->addCurrentPositionToNavigationHistory();
        gotoLine(link.line, link.column);
        setFocus();
        return true;
    }

    return openEditorAt(link.fileName, link.line, link.column, Core::Id(),
                          Core::EditorManager::IgnoreNavigationHistory
                        | Core::EditorManager::ModeSwitch);
}

void BaseTextEditorWidget::updateLink(QMouseEvent *e)
{
    bool linkFound = false;

    if (mouseNavigationEnabled() && e->modifiers() & Qt::ControlModifier) {
        // Link emulation behaviour for 'go to definition'
        const QTextCursor cursor = cursorForPosition(e->pos());

        // Check that the mouse was actually on the text somewhere
        bool onText = cursorRect(cursor).right() >= e->x();
        if (!onText) {
            QTextCursor nextPos = cursor;
            nextPos.movePosition(QTextCursor::Right);
            onText = cursorRect(nextPos).right() >= e->x();
        }

        const Link link = findLinkAt(cursor, false);

        if (onText && link.isValid()) {
            showLink(link);
            linkFound = true;
        }
    }

    if (!linkFound)
        clearLink();
}

void BaseTextEditorWidget::showLink(const Link &link)
{
    if (d->m_currentLink == link)
        return;

    QTextEdit::ExtraSelection sel;
    sel.cursor = textCursor();
    sel.cursor.setPosition(link.begin);
    sel.cursor.setPosition(link.end, QTextCursor::KeepAnchor);
    sel.format = d->m_linkFormat;
    sel.format.setFontUnderline(true);
    setExtraSelections(OtherSelection, QList<QTextEdit::ExtraSelection>() << sel);
    viewport()->setCursor(Qt::PointingHandCursor);
    d->m_currentLink = link;
    d->m_linkPressed = false;
}

void BaseTextEditorWidget::clearLink()
{
    if (!d->m_currentLink.isValid())
        return;

    setExtraSelections(OtherSelection, QList<QTextEdit::ExtraSelection>());
    viewport()->setCursor(Qt::IBeamCursor);
    d->m_currentLink = Link();
    d->m_linkPressed = false;
}

void BaseTextEditorPrivate::updateMarksBlock(const QTextBlock &block)
{
    if (const TextBlockUserData *userData = BaseTextDocumentLayout::testUserData(block))
        foreach (ITextMark *mrk, userData->marks())
            mrk->updateBlock(block);
}

void BaseTextEditorPrivate::updateMarksLineNumber()
{
    QTextDocument *doc = q->document();
    QTextBlock block = doc->begin();
    int blockNumber = 0;
    while (block.isValid()) {
        if (const TextBlockUserData *userData = BaseTextDocumentLayout::testUserData(block))
            foreach (ITextMark *mrk, userData->marks()) {
                mrk->updateLineNumber(blockNumber + 1);
            }
        block = block.next();
        ++blockNumber;
    }
}

void BaseTextEditorWidget::markBlocksAsChanged(QList<int> blockNumbers)
{
    QTextBlock block = document()->begin();
    while (block.isValid()) {
        if (block.revision() < 0)
            block.setRevision(-block.revision() - 1);
        block = block.next();
    }
    foreach (const int blockNumber, blockNumbers) {
        QTextBlock block = document()->findBlockByNumber(blockNumber);
        if (block.isValid())
            block.setRevision(-block.revision() - 1);
    }
}


void BaseTextEditorWidget::highlightSearchResults(const QString &txt, Find::FindFlags findFlags)
{
    QString pattern = txt;
    // highlighting single characters only if you're searching for whole words
    if (pattern.size() < 2 && !(findFlags & Find::FindWholeWords))
        pattern.clear();

    if (d->m_searchExpr.pattern() == pattern)
        return;
    d->m_searchExpr.setPattern(pattern);
    d->m_searchExpr.setPatternSyntax((findFlags & Find::FindRegularExpression) ?
                                     QRegExp::RegExp : QRegExp::FixedString);
    d->m_searchExpr.setCaseSensitivity((findFlags & Find::FindCaseSensitively) ?
                                       Qt::CaseSensitive : Qt::CaseInsensitive);
    d->m_findFlags = findFlags;

    d->m_delayedUpdateTimer->start(50);
}

int BaseTextEditorWidget::verticalBlockSelectionFirstColumn() const
{
    if (d->m_inBlockSelectionMode)
        return d->m_blockSelection.firstVisualColumn;
    return -1;
}

int BaseTextEditorWidget::verticalBlockSelectionLastColumn() const
{
    if (d->m_inBlockSelectionMode)
        return d->m_blockSelection.lastVisualColumn;
    return -1;
}

QRegion BaseTextEditorWidget::translatedLineRegion(int lineStart, int lineEnd) const
{
    QRegion region;
    for (int i = lineStart ; i <= lineEnd; i++) {
        QTextBlock block = document()->findBlockByNumber(i);
        QPoint topLeft = blockBoundingGeometry(block).translated(contentOffset()).topLeft().toPoint();

        if (block.isValid()) {
            QTextLayout *layout = block.layout();

            for (int i = 0; i < layout->lineCount();i++) {
                QTextLine line = layout->lineAt(i);
                region += line.naturalTextRect().translated(topLeft).toRect();
            }
        }
    }
    return region;
}

void BaseTextEditorWidget::setFindScope(const QTextCursor &start, const QTextCursor &end,
                                  int verticalBlockSelectionFirstColumn,
                                  int verticalBlockSelectionLastColumn)
{
    if (start != d->m_findScopeStart
            || end != d->m_findScopeEnd
            || verticalBlockSelectionFirstColumn != d->m_findScopeVerticalBlockSelectionFirstColumn
            || verticalBlockSelectionLastColumn != d->m_findScopeVerticalBlockSelectionLastColumn) {
        d->m_findScopeStart = start;
        d->m_findScopeEnd = end;
        d->m_findScopeVerticalBlockSelectionFirstColumn = verticalBlockSelectionFirstColumn;
        d->m_findScopeVerticalBlockSelectionLastColumn = verticalBlockSelectionLastColumn;
        viewport()->update();
    }
}

void BaseTextEditorWidget::_q_animateUpdate(int position, QPointF lastPos, QRectF rect)
{
    QTextCursor cursor(textCursor());
    cursor.setPosition(position);
    viewport()->update(QRectF(cursorRect(cursor).topLeft() + rect.topLeft(), rect.size()).toAlignedRect());
    if (!lastPos.isNull())
        viewport()->update(QRectF(lastPos + rect.topLeft(), rect.size()).toAlignedRect());
}


BaseTextEditorAnimator::BaseTextEditorAnimator(QObject *parent)
        :QObject(parent)
{
    m_value = 0;
    m_timeline = new QTimeLine(256, this);
    m_timeline->setCurveShape(QTimeLine::SineCurve);
    connect(m_timeline, SIGNAL(valueChanged(qreal)), this, SLOT(step(qreal)));
    connect(m_timeline, SIGNAL(finished()), this, SLOT(deleteLater()));
    m_timeline->start();
}


void BaseTextEditorAnimator::setData(QFont f, QPalette pal, const QString &text)
{
    m_font = f;
    m_palette = pal;
    m_text = text;
    QFontMetrics fm(m_font);
    m_size = QSizeF(fm.width(m_text), fm.height());
}

void BaseTextEditorAnimator::draw(QPainter *p, const QPointF &pos)
{
    m_lastDrawPos = pos;
    p->setPen(m_palette.text().color());
    QFont f = m_font;
    f.setPointSizeF(f.pointSizeF() * (1.0 + m_value/2));
    QFontMetrics fm(f);
    int width = fm.width(m_text);
    QRectF r((m_size.width()-width)/2, (m_size.height() - fm.height())/2, width, fm.height());
    r.translate(pos);
    p->fillRect(r, m_palette.base());
    p->setFont(f);
    p->drawText(r, m_text);
}

bool BaseTextEditorAnimator::isRunning() const
{
    return m_timeline->state() == QTimeLine::Running;
}

QRectF BaseTextEditorAnimator::rect() const
{
    QFont f = m_font;
    f.setPointSizeF(f.pointSizeF() * (1.0 + m_value/2));
    QFontMetrics fm(f);
    int width = fm.width(m_text);
    return QRectF((m_size.width()-width)/2, (m_size.height() - fm.height())/2, width, fm.height());
}

void BaseTextEditorAnimator::step(qreal v)
{
    QRectF before = rect();
    m_value = v;
    QRectF after = rect();
    emit updateRequest(m_position, m_lastDrawPos, before.united(after));
}

void BaseTextEditorAnimator::finish()
{
    m_timeline->stop();
    step(0);
    deleteLater();
}

void BaseTextEditorWidget::_q_matchParentheses()
{
    if (isReadOnly())
        return;

    QTextCursor backwardMatch = textCursor();
    QTextCursor forwardMatch = textCursor();
    const TextBlockUserData::MatchType backwardMatchType = TextBlockUserData::matchCursorBackward(&backwardMatch);
    const TextBlockUserData::MatchType forwardMatchType = TextBlockUserData::matchCursorForward(&forwardMatch);

    QList<QTextEdit::ExtraSelection> extraSelections;

    if (backwardMatchType == TextBlockUserData::NoMatch && forwardMatchType == TextBlockUserData::NoMatch) {
        setExtraSelections(ParenthesesMatchingSelection, extraSelections); // clear
        return;
    }

    int animatePosition = -1;
    if (backwardMatch.hasSelection()) {
        QTextEdit::ExtraSelection sel;
        if (backwardMatchType == TextBlockUserData::Mismatch) {
            sel.cursor = backwardMatch;
            sel.format = d->m_mismatchFormat;
        } else {

            if (d->m_displaySettings.m_animateMatchingParentheses) {
                animatePosition = backwardMatch.selectionStart();
            } else if (d->m_formatRange) {
                sel.cursor = backwardMatch;
                sel.format = d->m_rangeFormat;
                extraSelections.append(sel);
            }

            sel.cursor = backwardMatch;
            sel.format = d->m_matchFormat;

            sel.cursor.setPosition(backwardMatch.selectionStart());
            sel.cursor.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor);
            extraSelections.append(sel);

            sel.cursor.setPosition(backwardMatch.selectionEnd());
            sel.cursor.movePosition(QTextCursor::PreviousCharacter, QTextCursor::KeepAnchor);
        }
        extraSelections.append(sel);
    }

    if (forwardMatch.hasSelection()) {
        QTextEdit::ExtraSelection sel;
        if (forwardMatchType == TextBlockUserData::Mismatch) {
            sel.cursor = forwardMatch;
            sel.format = d->m_mismatchFormat;
        } else {

            if (d->m_displaySettings.m_animateMatchingParentheses) {
                animatePosition = forwardMatch.selectionEnd()-1;
            } else if (d->m_formatRange) {
                sel.cursor = forwardMatch;
                sel.format = d->m_rangeFormat;
                extraSelections.append(sel);
            }

            sel.cursor = forwardMatch;
            sel.format = d->m_matchFormat;

            sel.cursor.setPosition(forwardMatch.selectionStart());
            sel.cursor.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor);
            extraSelections.append(sel);

            sel.cursor.setPosition(forwardMatch.selectionEnd());
            sel.cursor.movePosition(QTextCursor::PreviousCharacter, QTextCursor::KeepAnchor);
        }
        extraSelections.append(sel);
    }


    if (animatePosition >= 0) {
        foreach (const QTextEdit::ExtraSelection &sel, BaseTextEditorWidget::extraSelections(ParenthesesMatchingSelection)) {
            if (sel.cursor.selectionStart() == animatePosition
                || sel.cursor.selectionEnd() - 1 == animatePosition) {
                animatePosition = -1;
                break;
            }
        }
    }

    if (animatePosition >= 0) {
        if (d->m_animator)
            d->m_animator->finish();  // one animation is enough
        d->m_animator = new BaseTextEditorAnimator(this);
        d->m_animator->setPosition(animatePosition);
        QPalette pal;
        pal.setBrush(QPalette::Text, d->m_matchFormat.foreground());
        pal.setBrush(QPalette::Base, d->m_rangeFormat.background());
        d->m_animator->setData(font(), pal, characterAt(d->m_animator->position()));
        connect(d->m_animator, SIGNAL(updateRequest(int,QPointF,QRectF)),
                this, SLOT(_q_animateUpdate(int,QPointF,QRectF)));
    }

    setExtraSelections(ParenthesesMatchingSelection, extraSelections);
}

void BaseTextEditorWidget::_q_highlightBlocks()
{
    BaseTextEditorPrivateHighlightBlocks highlightBlocksInfo;

    QTextBlock block;
    if (d->extraAreaHighlightFoldedBlockNumber >= 0) {
        block = document()->findBlockByNumber(d->extraAreaHighlightFoldedBlockNumber);
        if (block.isValid()
            && block.next().isValid()
            && BaseTextDocumentLayout::foldingIndent(block.next())
            > BaseTextDocumentLayout::foldingIndent(block))
            block = block.next();
    }

    QTextBlock closeBlock = block;
    while (block.isValid()) {
        int foldingIndent = BaseTextDocumentLayout::foldingIndent(block);

        while (block.previous().isValid() && BaseTextDocumentLayout::foldingIndent(block) >= foldingIndent)
            block = block.previous();
        int nextIndent = BaseTextDocumentLayout::foldingIndent(block);
        if (nextIndent == foldingIndent)
            break;
        highlightBlocksInfo.open.prepend(block.blockNumber());
        while (closeBlock.next().isValid()
            && BaseTextDocumentLayout::foldingIndent(closeBlock.next()) >= foldingIndent )
            closeBlock = closeBlock.next();
        highlightBlocksInfo.close.append(closeBlock.blockNumber());
        int visualIndent = qMin(d->visualIndent(block), d->visualIndent(closeBlock));
        highlightBlocksInfo.visualIndent.prepend(visualIndent);
    }

#if 0
    if (block.isValid()) {
        QTextCursor cursor(block);
        if (d->extraAreaHighlightCollapseColumn >= 0)
            cursor.setPosition(cursor.position() + qMin(d->extraAreaHighlightCollapseColumn,
                                                        block.length()-1));
        QTextCursor closeCursor;
        bool firstRun = true;
        while (TextBlockUserData::findPreviousBlockOpenParenthesis(&cursor, firstRun)) {
            firstRun = false;
            highlightBlocksInfo.open.prepend(cursor.blockNumber());
            int visualIndent = d->visualIndent(cursor.block());
            if (closeCursor.isNull())
                closeCursor = cursor;
            if (TextBlockUserData::findNextBlockClosingParenthesis(&closeCursor)) {
                highlightBlocksInfo.close.append(closeCursor.blockNumber());
                visualIndent = qMin(visualIndent, d->visualIndent(closeCursor.block()));
            }
            highlightBlocksInfo.visualIndent.prepend(visualIndent);
        }
    }
#endif
    if (d->m_highlightBlocksInfo != highlightBlocksInfo) {
        d->m_highlightBlocksInfo = highlightBlocksInfo;
        viewport()->update();
        d->m_extraArea->update();
    }
}

void BaseTextEditorWidget::setActionHack(QObject *hack)
{
    d->m_actionHack = hack;
}

QObject *BaseTextEditorWidget::actionHack() const
{
    return d->m_actionHack;
}

void BaseTextEditorWidget::changeEvent(QEvent *e)
{
    QPlainTextEdit::changeEvent(e);
    if (e->type() == QEvent::ApplicationFontChange
        || e->type() == QEvent::FontChange) {
        if (d->m_extraArea) {
            QFont f = d->m_extraArea->font();
            f.setPointSizeF(font().pointSizeF());
            d->m_extraArea->setFont(f);
            slotUpdateExtraAreaWidth();
            d->m_extraArea->update();
        }
    }
}

void BaseTextEditorWidget::focusInEvent(QFocusEvent *e)
{
    QPlainTextEdit::focusInEvent(e);
    updateHighlights();
}

void BaseTextEditorWidget::focusOutEvent(QFocusEvent *e)
{
    QPlainTextEdit::focusOutEvent(e);
    if (viewport()->cursor().shape() == Qt::BlankCursor)
        viewport()->setCursor(Qt::IBeamCursor);
}


void BaseTextEditorWidget::maybeSelectLine()
{
    QTextCursor cursor = textCursor();
    if (!cursor.hasSelection()) {
        const QTextBlock &block = cursor.block();
        if (block.next().isValid()) {
            cursor.setPosition(block.position());
            cursor.setPosition(block.next().position(), QTextCursor::KeepAnchor);
        } else {
            cursor.movePosition(QTextCursor::EndOfBlock);
            cursor.movePosition(QTextCursor::StartOfBlock, QTextCursor::KeepAnchor);
            cursor.movePosition(QTextCursor::PreviousCharacter, QTextCursor::KeepAnchor);
        }
        setTextCursor(cursor);
    }
}

// shift+del
void BaseTextEditorWidget::cutLine()
{
    maybeSelectLine();
    cut();
}

// ctrl+ins
void BaseTextEditorWidget::copyLine()
{
    QTextCursor prevCursor = textCursor();
    maybeSelectLine();
    copy();
    setTextCursor(prevCursor);
}

void BaseTextEditorWidget::deleteLine()
{
    maybeSelectLine();
    textCursor().removeSelectedText();
}

void BaseTextEditorWidget::deleteEndOfWord()
{
    moveCursor(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
    textCursor().removeSelectedText();
    setTextCursor(textCursor());
}

void BaseTextEditorWidget::deleteEndOfWordCamelCase()
{
    QTextCursor c = textCursor();
    camelCaseRight(c, QTextCursor::KeepAnchor);
    c.removeSelectedText();
    setTextCursor(c);
}

void BaseTextEditorWidget::deleteStartOfWord()
{
    moveCursor(QTextCursor::StartOfWord, QTextCursor::KeepAnchor);
    textCursor().removeSelectedText();
    setTextCursor(textCursor());
}

void BaseTextEditorWidget::deleteStartOfWordCamelCase()
{
    QTextCursor c = textCursor();
    camelCaseLeft(c, QTextCursor::KeepAnchor);
    c.removeSelectedText();
    setTextCursor(c);
}

void BaseTextEditorWidget::setExtraSelections(ExtraSelectionKind kind, const QList<QTextEdit::ExtraSelection> &selections)
{
    if (selections.isEmpty() && d->m_extraSelections[kind].isEmpty())
        return;
    d->m_extraSelections[kind] = selections;

    if (kind == CodeSemanticsSelection) {
        d->m_overlay->clear();
        foreach (const QTextEdit::ExtraSelection &selection, d->m_extraSelections[kind]) {
            d->m_overlay->addOverlaySelection(selection.cursor,
                                              selection.format.background().color(),
                                              selection.format.background().color(),
                                              TextEditorOverlay::LockSize);
        }
        d->m_overlay->setVisible(!d->m_overlay->isEmpty());
    } else if (kind == SnippetPlaceholderSelection) {
        d->m_snippetOverlay->clear();
        foreach (const QTextEdit::ExtraSelection &selection, d->m_extraSelections[kind]) {
            d->m_snippetOverlay->addOverlaySelection(selection.cursor,
                                              selection.format.background().color(),
                                              selection.format.background().color(),
                                              TextEditorOverlay::ExpandBegin);
        }
        d->m_snippetOverlay->mapEquivalentSelections();
        d->m_snippetOverlay->setVisible(!d->m_snippetOverlay->isEmpty());
    } else {
        QList<QTextEdit::ExtraSelection> all;
        for (int i = 0; i < NExtraSelectionKinds; ++i) {
            if (i == CodeSemanticsSelection || i == SnippetPlaceholderSelection)
                continue;
            all += d->m_extraSelections[i];
        }
        QPlainTextEdit::setExtraSelections(all);
    }
}

QList<QTextEdit::ExtraSelection> BaseTextEditorWidget::extraSelections(ExtraSelectionKind kind) const
{
    return d->m_extraSelections[kind];
}

void BaseTextEditorWidget::maybeClearSomeExtraSelections(const QTextCursor &cursor)
{
    const int smallSelectionSize = 50 * 50;
    if (cursor.selectionEnd() - cursor.selectionStart() < smallSelectionSize)
        return;

    d->m_extraSelections[UndefinedSymbolSelection].clear();
    d->m_extraSelections[ObjCSelection].clear();
    d->m_extraSelections[CodeWarningsSelection].clear();

    QList<QTextEdit::ExtraSelection> all;
    for (int i = 0; i < NExtraSelectionKinds; ++i) {
        if (i == CodeSemanticsSelection || i == SnippetPlaceholderSelection)
            continue;
        all += d->m_extraSelections[i];
    }
    QPlainTextEdit::setExtraSelections(all);
}

QString BaseTextEditorWidget::extraSelectionTooltip(int pos) const
{
    QList<QTextEdit::ExtraSelection> all;
    for (int i = 0; i < NExtraSelectionKinds; ++i) {
        const QList<QTextEdit::ExtraSelection> &sel = d->m_extraSelections[i];
        for (int j = 0; j < sel.size(); ++j) {
            const QTextEdit::ExtraSelection &s = sel.at(j);
            if (s.cursor.selectionStart() <= pos
                && s.cursor.selectionEnd() >= pos
                && !s.format.toolTip().isEmpty())
                return s.format.toolTip();
        }
    }
    return QString();
}

// the blocks list must be sorted
void BaseTextEditorWidget::setIfdefedOutBlocks(const QList<BaseTextEditorWidget::BlockRange> &blocks)
{
    QTextDocument *doc = document();
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);

    bool needUpdate = false;

    QTextBlock block = doc->firstBlock();

    int rangeNumber = 0;
    int braceDepthDelta = 0;
    while (block.isValid()) {
        bool cleared = false;
        bool set = false;
        if (rangeNumber < blocks.size()) {
            const BlockRange &range = blocks.at(rangeNumber);
            if (block.position() >= range.first && ((block.position() + block.length() - 1) <= range.last || !range.last)) {
                set = BaseTextDocumentLayout::setIfdefedOut(block);
            } else {
                cleared = BaseTextDocumentLayout::clearIfdefedOut(block);
            }
            if (block.contains(range.last))
                ++rangeNumber;
        } else {
            cleared = BaseTextDocumentLayout::clearIfdefedOut(block);
        }

        if (cleared || set) {
            needUpdate = true;
            int delta = BaseTextDocumentLayout::braceDepthDelta(block);
            if (cleared)
                braceDepthDelta += delta;
            else if (set)
                braceDepthDelta -= delta;
        }

        if (braceDepthDelta) {
            BaseTextDocumentLayout::changeBraceDepth(block,braceDepthDelta);
            BaseTextDocumentLayout::changeFoldingIndent(block, braceDepthDelta); // ### C++ only, refactor!
        }

        block = block.next();
    }

    if (needUpdate)
        documentLayout->requestUpdate();
}

void BaseTextEditorWidget::format()
{
    QTextCursor cursor = textCursor();
    cursor.beginEditBlock();
    indent(document(), cursor, QChar::Null);
    cursor.endEditBlock();
}

void BaseTextEditorWidget::rewrapParagraph()
{
    const int paragraphWidth = displaySettings().m_wrapColumn;
    const QRegExp anyLettersOrNumbers = QRegExp(QLatin1String("\\w"));
    const int tabSize = tabSettings().m_tabSize;

    QTextCursor cursor = textCursor();
    cursor.beginEditBlock();

    // Find start of paragraph.

    while (cursor.movePosition(QTextCursor::PreviousBlock, QTextCursor::MoveAnchor)) {
        QTextBlock block = cursor.block();
        QString text = block.text();

        // If this block is empty, move marker back to previous and terminate.
        if (!text.contains(anyLettersOrNumbers)) {
            cursor.movePosition(QTextCursor::NextBlock, QTextCursor::MoveAnchor);
            break;
        }
    }

    cursor.movePosition(QTextCursor::StartOfBlock, QTextCursor::MoveAnchor);

    // Find indent level of current block.

    int indentLevel = 0;
    QString text = cursor.block().text();

    for (int i = 0; i < text.length(); i++) {
        const QChar ch = text.at(i);

        if (ch == QLatin1Char(' '))
            indentLevel++;
        else if (ch == QLatin1Char('\t'))
            indentLevel += tabSize - (indentLevel % tabSize);
        else
            break;
    }

    // If there is a common prefix, it should be kept and expanded to all lines.
    // this allows nice reflowing of doxygen style comments.
    QTextCursor nextBlock = cursor;
    QString commonPrefix;

    if (nextBlock.movePosition(QTextCursor::NextBlock))
    {
         QString nText = nextBlock.block().text();
         int maxLength = qMin(text.length(), nText.length());

         for (int i = 0; i < maxLength; ++i) {
             const QChar ch = text.at(i);

             if (ch != nText[i] || ch.isLetterOrNumber())
                 break;
             commonPrefix.append(ch);
         }
    }


    // Find end of paragraph.
    while (cursor.movePosition(QTextCursor::NextBlock, QTextCursor::KeepAnchor)) {
        QString text = cursor.block().text();

        if (!text.contains(anyLettersOrNumbers))
            break;
    }


    QString selectedText = cursor.selectedText();

    // Preserve initial indent level.or common prefix.
    QString spacing;

    if (commonPrefix.isEmpty()) {
        spacing = tabSettings().indentationString(0, indentLevel, textCursor().block());
    } else {
        spacing = commonPrefix;
        indentLevel = commonPrefix.length();
    }

    int currentLength = indentLevel;
    QString result;
    result.append(spacing);

    // Remove existing instances of any common prefix from paragraph to
    // reflow.
    selectedText.remove(0, commonPrefix.length());
    commonPrefix.prepend(QChar::ParagraphSeparator);
    selectedText.replace(commonPrefix, QLatin1String("\n"));

    // remove any repeated spaces, trim lines to PARAGRAPH_WIDTH width and
    // keep the same indentation level as first line in paragraph.
    QString currentWord;

    for (int i = 0; i < selectedText.length(); ++i) {
        QChar ch = selectedText.at(i);
        if (ch.isSpace()) {
            if (!currentWord.isEmpty()) {
                currentLength += currentWord.length() + 1;

                if (currentLength > paragraphWidth) {
                    currentLength = currentWord.length() + 1 + indentLevel;
                    result.chop(1); // remove trailing space
                    result.append(QChar::ParagraphSeparator);
                    result.append(spacing);
                }

                result.append(currentWord);
                result.append(QLatin1Char(' '));
                currentWord.clear();
            }

            continue;
        }

        currentWord.append(ch);
    }
    result.chop(1);
    result.append(QChar::ParagraphSeparator);

    cursor.insertText(result);
    cursor.endEditBlock();
}

void BaseTextEditorWidget::unCommentSelection()
{
}

void BaseTextEditorWidget::showEvent(QShowEvent* e)
{
    if (!d->m_fontSettings.isEmpty()) {
        setFontSettings(d->m_fontSettings);
        d->m_fontSettings.clear();
    }
    QPlainTextEdit::showEvent(e);
}


void BaseTextEditorWidget::setFontSettingsIfVisible(const TextEditor::FontSettings &fs)
{
    if (!isVisible()) {
        d->m_fontSettings = fs;
        return;
    }
    setFontSettings(fs);
}

void BaseTextEditorWidget::setFontSettings(const TextEditor::FontSettings &fs)
{
    const QTextCharFormat textFormat = fs.toTextCharFormat(QLatin1String(Constants::C_TEXT));
    const QTextCharFormat selectionFormat = fs.toTextCharFormat(QLatin1String(Constants::C_SELECTION));
    const QTextCharFormat lineNumberFormat = fs.toTextCharFormat(QLatin1String(Constants::C_LINE_NUMBER));
    const QTextCharFormat searchResultFormat = fs.toTextCharFormat(QLatin1String(Constants::C_SEARCH_RESULT));
    d->m_searchScopeFormat = fs.toTextCharFormat(QLatin1String(Constants::C_SEARCH_SCOPE));
    const QTextCharFormat parenthesesFormat = fs.toTextCharFormat(QLatin1String(Constants::C_PARENTHESES));
    d->m_currentLineFormat = fs.toTextCharFormat(QLatin1String(Constants::C_CURRENT_LINE));
    d->m_currentLineNumberFormat = fs.toTextCharFormat(QLatin1String(Constants::C_CURRENT_LINE_NUMBER));
    d->m_linkFormat = fs.toTextCharFormat(QLatin1String(TextEditor::Constants::C_LINK));
    d->m_ifdefedOutFormat = fs.toTextCharFormat(QLatin1String(Constants::C_DISABLED_CODE));
    QFont font(textFormat.font());

    const QColor foreground = textFormat.foreground().color();
    const QColor background = textFormat.background().color();
    QPalette p = palette();
    p.setColor(QPalette::Text, foreground);
    p.setColor(QPalette::Foreground, foreground);
    p.setColor(QPalette::Base, background);
    p.setColor(QPalette::Highlight, (selectionFormat.background().style() != Qt::NoBrush) ?
               selectionFormat.background().color() :
               QApplication::palette().color(QPalette::Highlight));

    p.setBrush(QPalette::HighlightedText, selectionFormat.foreground());

    p.setBrush(QPalette::Inactive, QPalette::Highlight, p.highlight());
    p.setBrush(QPalette::Inactive, QPalette::HighlightedText, p.highlightedText());
    setPalette(p);
    setFont(font);
    setTabSettings(d->m_document->tabSettings()); // update tabs, they depend on the font

    // Line numbers
    QPalette ep = d->m_extraArea->palette();
    ep.setColor(QPalette::Dark, lineNumberFormat.foreground().color());
    ep.setColor(QPalette::Background, lineNumberFormat.background().style() != Qt::NoBrush ?
                lineNumberFormat.background().color() : background);
    d->m_extraArea->setPalette(ep);

    // Search results
    d->m_searchResultFormat.setBackground(searchResultFormat.background());

    // Matching braces
    d->m_matchFormat.setForeground(parenthesesFormat.foreground());
    d->m_rangeFormat.setBackground(parenthesesFormat.background());


    // snippests
    d->m_occurrencesFormat = fs.toTextCharFormat(QLatin1String(TextEditor::Constants::C_OCCURRENCES));
    d->m_occurrencesFormat.clearForeground();
    d->m_occurrenceRenameFormat = fs.toTextCharFormat(QLatin1String(TextEditor::Constants::C_OCCURRENCES_RENAME));
    d->m_occurrenceRenameFormat.clearForeground();

    slotUpdateExtraAreaWidth();   // Adjust to new font width
    updateCurrentLineHighlight(); // Make sure it takes the new color
}

void BaseTextEditorWidget::setTabSettings(const TabSettings &ts)
{
    d->m_document->setTabSettings(ts);

    // Although the tab stop is stored as qreal the API from QPlainTextEdit only allows it
    // to be set as an int. A work around is to access directly the QTextOption.
    qreal charWidth = QFontMetricsF(font()).width(QLatin1Char(' '));
    QTextOption option = document()->defaultTextOption();
    option.setTabStop(charWidth * ts.m_tabSize);
    document()->setDefaultTextOption(option);
}

void BaseTextEditorWidget::setDisplaySettings(const DisplaySettings &ds)
{
    setLineWrapMode(ds.m_textWrapping ? QPlainTextEdit::WidgetWidth : QPlainTextEdit::NoWrap);
    setLineNumbersVisible(ds.m_displayLineNumbers);
    setVisibleWrapColumn(ds.m_showWrapColumn ? ds.m_wrapColumn : 0);
    setHighlightCurrentLine(ds.m_highlightCurrentLine);
    setRevisionsVisible(ds.m_markTextChanges);
    setCenterOnScroll(ds.m_centerCursorOnScroll);

    if (d->m_displaySettings.m_visualizeWhitespace != ds.m_visualizeWhitespace) {
        if (SyntaxHighlighter *highlighter = baseTextDocument()->syntaxHighlighter())
            highlighter->rehighlight();
        QTextOption option =  document()->defaultTextOption();
        if (ds.m_visualizeWhitespace)
            option.setFlags(option.flags() | QTextOption::ShowTabsAndSpaces);
        else
            option.setFlags(option.flags() & ~QTextOption::ShowTabsAndSpaces);
        option.setFlags(option.flags() | QTextOption::AddSpaceForLineAndParagraphSeparators);
        document()->setDefaultTextOption(option);
    }

    d->m_displaySettings = ds;
    if (!ds.m_highlightBlocks) {
        d->extraAreaHighlightFoldedBlockNumber = -1;
        d->m_highlightBlocksInfo = BaseTextEditorPrivateHighlightBlocks();
    }

    updateCodeFoldingVisible();
    updateHighlights();
    viewport()->update();
    extraArea()->update();
}

void BaseTextEditorWidget::setBehaviorSettings(const TextEditor::BehaviorSettings &bs)
{
    d->m_behaviorSettings = bs;
}

void BaseTextEditorWidget::setTypingSettings(const TypingSettings &typingSettings)
{
    d->m_document->setTypingSettings(typingSettings);
}

void BaseTextEditorWidget::setStorageSettings(const StorageSettings &storageSettings)
{
    d->m_document->setStorageSettings(storageSettings);
}

void BaseTextEditorWidget::setCompletionSettings(const TextEditor::CompletionSettings &completionSettings)
{
    d->m_autoCompleter->setAutoParenthesesEnabled(completionSettings.m_autoInsertBrackets);
    d->m_autoCompleter->setSurroundWithEnabled(completionSettings.m_autoInsertBrackets
                                               && completionSettings.m_surroundingAutoBrackets);
}

void BaseTextEditorWidget::setExtraEncodingSettings(const ExtraEncodingSettings &extraEncodingSettings)
{
    d->m_document->setExtraEncodingSettings(extraEncodingSettings);
}

void BaseTextEditorWidget::fold()
{
    QTextDocument *doc = document();
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);
    QTextBlock block = textCursor().block();
    if (!(BaseTextDocumentLayout::canFold(block) && block.next().isVisible())) {
        // find the closest previous block which can fold
        int indent = BaseTextDocumentLayout::foldingIndent(block);
        while (block.isValid() && (BaseTextDocumentLayout::foldingIndent(block) >= indent || !block.isVisible()))
            block = block.previous();
    }
    if (block.isValid()) {
        BaseTextDocumentLayout::doFoldOrUnfold(block, false);
        d->moveCursorVisible();
        documentLayout->requestUpdate();
        documentLayout->emitDocumentSizeChanged();
    }
}

void BaseTextEditorWidget::unfold()
{
    QTextDocument *doc = document();
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);
    QTextBlock block = textCursor().block();
    while (block.isValid() && !block.isVisible())
        block = block.previous();
    BaseTextDocumentLayout::doFoldOrUnfold(block, true);
    d->moveCursorVisible();
    documentLayout->requestUpdate();
    documentLayout->emitDocumentSizeChanged();
}

void BaseTextEditorWidget::unfoldAll()
{
    QTextDocument *doc = document();
    BaseTextDocumentLayout *documentLayout = qobject_cast<BaseTextDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);

    QTextBlock block = doc->firstBlock();
    bool makeVisible = true;
    while (block.isValid()) {
        if (block.isVisible() && BaseTextDocumentLayout::canFold(block) && block.next().isVisible()) {
            makeVisible = false;
            break;
        }
        block = block.next();
    }

    block = doc->firstBlock();

    while (block.isValid()) {
        if (BaseTextDocumentLayout::canFold(block))
            BaseTextDocumentLayout::doFoldOrUnfold(block, makeVisible);
        block = block.next();
    }

    d->moveCursorVisible();
    documentLayout->requestUpdate();
    documentLayout->emitDocumentSizeChanged();
    centerCursor();
}

void BaseTextEditorWidget::setTextCodec(QTextCodec *codec)
{
    baseTextDocument()->setCodec(codec);
}

QTextCodec *BaseTextEditorWidget::textCodec() const
{
    // TODO: Fix all QTextCodec usages to be const *.
    return const_cast<QTextCodec *>(baseTextDocument()->codec());
}

void BaseTextEditorWidget::setReadOnly(bool b)
{
    QPlainTextEdit::setReadOnly(b);
    if (b)
        setTextInteractionFlags(textInteractionFlags() | Qt::TextSelectableByKeyboard);
}

void BaseTextEditorWidget::cut()
{
    if (d->m_inBlockSelectionMode) {
        copy();
        d->removeBlockSelection();
        return;
    }
    QPlainTextEdit::cut();
}

void BaseTextEditorWidget::selectAll()
{
    d->clearBlockSelection();
    QPlainTextEdit::selectAll();
}

void BaseTextEditorWidget::copy()
{
    if (!textCursor().hasSelection())
        return;

    QPlainTextEdit::copy();

    const QMimeData *mimeData = QApplication::clipboard()->mimeData();
    if (mimeData) {
        CircularClipboard *circularClipBoard = CircularClipboard::instance();
        circularClipBoard->collect(duplicateMimeData(mimeData));
        // We want the latest copied content to be the first one to appear on circular paste.
        circularClipBoard->toLastCollect();
    }
}

void BaseTextEditorWidget::paste()
{
    if (d->m_inBlockSelectionMode) {
        d->removeBlockSelection();
    }
    QPlainTextEdit::paste();
}

void BaseTextEditorWidget::circularPaste()
{
    const QMimeData *mimeData = CircularClipboard::instance()->next();
    if (!mimeData)
        return;

    QTextCursor cursor = textCursor();
    if (!d->m_isCirculatingClipboard) {
        cursor.beginEditBlock();
        d->m_isCirculatingClipboard = true;
    } else {
        cursor.joinPreviousEditBlock();
    }
    const int selectionStart = qMin(cursor.position(), cursor.anchor());
    insertFromMimeData(mimeData);
    cursor.setPosition(selectionStart, QTextCursor::KeepAnchor);
    cursor.endEditBlock();

    setTextCursor(flippedCursor(cursor));

    // We want to latest pasted content to replace the system's current clipboard.
    QPlainTextEdit::copy();
}

QMimeData *BaseTextEditorWidget::createMimeDataFromSelection() const
{
    if (d->m_inBlockSelectionMode) {
        QMimeData *mimeData = new QMimeData;
        QString text = d->copyBlockSelection();
        mimeData->setData(QLatin1String(kVerticalTextBlockMimeType), text.toUtf8());
        mimeData->setText(text); // for exchangeability
        return mimeData;
    } else if (textCursor().hasSelection()) {
        QTextCursor cursor = textCursor();
        QMimeData *mimeData = new QMimeData;

        // Copy the selected text as plain text
        QString text = cursor.selectedText();
        convertToPlainText(text);
        mimeData->setText(text);

        // Copy the selected text as HTML
        {
            // Create a new document from the selected text document fragment
            QTextDocument *tempDocument = new QTextDocument;
            QTextCursor tempCursor(tempDocument);
            tempCursor.insertFragment(cursor.selection());

            // Apply the additional formats set by the syntax highlighter
            QTextBlock start = document()->findBlock(cursor.selectionStart());
            QTextBlock end = document()->findBlock(cursor.selectionEnd());
            end = end.next();

            const int selectionStart = cursor.selectionStart();
            const int endOfDocument = tempDocument->characterCount() - 1;
            for (QTextBlock current = start; current.isValid() && current != end; current = current.next()) {
                const QTextLayout *layout = current.layout();
                foreach (const QTextLayout::FormatRange &range, layout->additionalFormats()) {
                    const int start = current.position() + range.start - selectionStart;
                    const int end = start + range.length;
                    if (end <= 0 || start >= endOfDocument)
                        continue;
                    tempCursor.setPosition(qMax(start, 0));
                    tempCursor.setPosition(qMin(end, endOfDocument), QTextCursor::KeepAnchor);
                    tempCursor.setCharFormat(range.format);
                }
            }

            // Reset the user states since they are not interesting
            for (QTextBlock block = tempDocument->begin(); block.isValid(); block = block.next())
                block.setUserState(-1);

            // Make sure the text appears pre-formatted
            tempCursor.setPosition(0);
            tempCursor.movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
            QTextBlockFormat blockFormat = tempCursor.blockFormat();
            blockFormat.setNonBreakableLines(true);
            tempCursor.setBlockFormat(blockFormat);

            mimeData->setHtml(tempCursor.selection().toHtml());
            delete tempDocument;
        }

        /*
          Try to figure out whether we are copying an entire block, and store the complete block
          including indentation in the qtcreator.blocktext mimetype.
        */
        QTextCursor selstart = cursor;
        selstart.setPosition(cursor.selectionStart());
        QTextCursor selend = cursor;
        selend.setPosition(cursor.selectionEnd());
        const TabSettings &ts = d->m_document->tabSettings();

        bool startOk = ts.cursorIsAtBeginningOfLine(selstart);
        bool multipleBlocks = (selend.block() != selstart.block());

        if (startOk && multipleBlocks) {
            selstart.movePosition(QTextCursor::StartOfBlock);
            if (ts.cursorIsAtBeginningOfLine(selend))
                selend.movePosition(QTextCursor::StartOfBlock);
            cursor.setPosition(selstart.position());
            cursor.setPosition(selend.position(), QTextCursor::KeepAnchor);
            text = cursor.selectedText();
            mimeData->setData(QLatin1String(kTextBlockMimeType), text.toUtf8());
        }
        return mimeData;
    }
    return 0;
}

bool BaseTextEditorWidget::canInsertFromMimeData(const QMimeData *source) const
{
    return QPlainTextEdit::canInsertFromMimeData(source);
}

void BaseTextEditorWidget::insertFromMimeData(const QMimeData *source)
{
    if (isReadOnly())
        return;

    if (source->hasFormat(QLatin1String(kVerticalTextBlockMimeType))) {
        QString text = QString::fromUtf8(source->data(QLatin1String(kVerticalTextBlockMimeType)));
        if (text.isEmpty())
            return;

        if (d->m_codeAssistant->hasContext())
            d->m_codeAssistant->destroyContext();

        QStringList lines = text.split(QLatin1Char('\n'));
        QTextCursor cursor = textCursor();
        cursor.beginEditBlock();
        const TabSettings &ts = d->m_document->tabSettings();
        int initialCursorPosition = cursor.position();
        int column = ts.columnAt(cursor.block().text(), cursor.positionInBlock());
        cursor.insertText(lines.first());
        for (int i = 1; i < lines.count(); ++i) {
            QTextBlock next = cursor.block().next();
            if (next.isValid()) {
                cursor.setPosition(next.position());
            } else {
                cursor.movePosition(QTextCursor::EndOfBlock);
                cursor.insertBlock();
            }
            int offset = 0;
            int position = ts.positionAtColumn(cursor.block().text(), column, &offset);
            cursor.setPosition(cursor.block().position() + position);
            if (offset < 0) {
                cursor.deleteChar();
                cursor.insertText(QString(-offset, QLatin1Char(' ')));
            } else {
                cursor.insertText(QString(offset, QLatin1Char(' ')));
            }
            cursor.insertText(lines.at(i));
        }
        cursor.setPosition(initialCursorPosition);
        cursor.endEditBlock();
        setTextCursor(cursor);
        ensureCursorVisible();

        if (d->m_snippetOverlay->isVisible() && lines.count() > 1) {
            d->m_snippetOverlay->hide();
            d->m_snippetOverlay->clear();
        }

        return;
    }

    QString text = source->text();
    if (text.isEmpty())
        return;

    if (d->m_codeAssistant->hasContext())
        d->m_codeAssistant->destroyContext();

    if (d->m_snippetOverlay->isVisible() && (text.contains(QLatin1Char('\n'))
                                             || text.contains(QLatin1Char('\t')))) {
        d->m_snippetOverlay->hide();
        d->m_snippetOverlay->clear();
    }

    const TabSettings &ts = d->m_document->tabSettings();
    const TypingSettings &tps = d->m_document->typingSettings();
    QTextCursor cursor = textCursor();
    if (!tps.m_autoIndent) {
        cursor.beginEditBlock();
        cursor.insertText(text);
        cursor.endEditBlock();
        setTextCursor(cursor);
        return;
    }

    cursor.beginEditBlock();
    cursor.removeSelectedText();

    bool insertAtBeginningOfLine = ts.cursorIsAtBeginningOfLine(cursor);

    if (insertAtBeginningOfLine
        && source->hasFormat(QLatin1String(kTextBlockMimeType))) {
        text = QString::fromUtf8(source->data(QLatin1String(kTextBlockMimeType)));
        if (text.isEmpty())
            return;
    }

    int reindentBlockStart = cursor.blockNumber() + (insertAtBeginningOfLine?0:1);

    bool hasFinalNewline = (text.endsWith(QLatin1Char('\n'))
                            || text.endsWith(QChar::ParagraphSeparator)
                            || text.endsWith(QLatin1Char('\r')));

    if (insertAtBeginningOfLine
        && hasFinalNewline) // since we'll add a final newline, preserve current line's indentation
        cursor.setPosition(cursor.block().position());

    int cursorPosition = cursor.position();
    cursor.insertText(text);

    int reindentBlockEnd = cursor.blockNumber() - (hasFinalNewline?1:0);

    if (reindentBlockStart < reindentBlockEnd
        || (reindentBlockStart == reindentBlockEnd
            && (!insertAtBeginningOfLine || hasFinalNewline))) {
        if (insertAtBeginningOfLine && !hasFinalNewline) {
            QTextCursor unnecessaryWhitespace = cursor;
            unnecessaryWhitespace.setPosition(cursorPosition);
            unnecessaryWhitespace.movePosition(QTextCursor::StartOfBlock, QTextCursor::KeepAnchor);
            unnecessaryWhitespace.removeSelectedText();
        }
        QTextCursor c = cursor;
        c.setPosition(cursor.document()->findBlockByNumber(reindentBlockStart).position());
        c.setPosition(cursor.document()->findBlockByNumber(reindentBlockEnd).position(),
                      QTextCursor::KeepAnchor);
        reindent(document(), c);
    }

    cursor.endEditBlock();
    setTextCursor(cursor);
}

QMimeData *BaseTextEditorWidget::duplicateMimeData(const QMimeData *source) const
{
    Q_ASSERT(source);

    QMimeData *mimeData = new QMimeData;
    mimeData->setText(source->text());
    mimeData->setHtml(source->html());
    if (source->hasFormat(QLatin1String(kVerticalTextBlockMimeType))) {
        mimeData->setData(QLatin1String(kVerticalTextBlockMimeType),
                          source->data(QLatin1String(kVerticalTextBlockMimeType)));
    } else if (source->hasFormat(QLatin1String(kTextBlockMimeType))) {
        mimeData->setData(QLatin1String(kTextBlockMimeType),
                          source->data(QLatin1String(kTextBlockMimeType)));
    }

    return mimeData;
}

void BaseTextEditorWidget::appendStandardContextMenuActions(QMenu *menu)
{
    menu->addSeparator();
    Core::ActionManager *am = Core::ICore::actionManager();

    QAction *a = am->command(Core::Constants::CUT)->action();
    if (a && a->isEnabled())
        menu->addAction(a);
    a = am->command(Core::Constants::COPY)->action();
    if (a && a->isEnabled())
        menu->addAction(a);
    a = am->command(Core::Constants::PASTE)->action();
    if (a && a->isEnabled())
        menu->addAction(a);
    a = am->command(Constants::CIRCULAR_PASTE)->action();
    if (a && a->isEnabled())
        menu->addAction(a);
}


BaseTextEditor::BaseTextEditor(BaseTextEditorWidget *editor)
  : e(editor)
{
    setWidget(e);
    using namespace Find;
    Aggregation::Aggregate *aggregate = new Aggregation::Aggregate;
    BaseTextFind *baseTextFind = new BaseTextFind(editor);
    connect(baseTextFind, SIGNAL(highlightAll(QString,Find::FindFlags)),
            editor, SLOT(highlightSearchResults(QString,Find::FindFlags)));
    connect(baseTextFind, SIGNAL(findScopeChanged(QTextCursor,QTextCursor,int,int)),
            editor, SLOT(setFindScope(QTextCursor,QTextCursor,int,int)));
    aggregate->add(baseTextFind);
    aggregate->add(editor);

    m_cursorPositionLabel = new Utils::LineColumnLabel;

    m_stretchWidget = new QWidget;
    m_stretchWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);

    m_toolBar = new QToolBar;
    m_toolBar->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Minimum);
    m_toolBar->addWidget(m_stretchWidget);
    m_cursorPositionLabelAction = m_toolBar->addWidget(m_cursorPositionLabel);

    connect(editor, SIGNAL(cursorPositionChanged()), this, SLOT(updateCursorPosition()));
}

BaseTextEditor::~BaseTextEditor()
{
    delete m_toolBar;
    delete e;
}

QWidget *BaseTextEditor::toolBar()
{
    return m_toolBar;
}

void BaseTextEditor::insertExtraToolBarWidget(BaseTextEditor::Side side,
                                              QWidget *widget)
{
    if (widget->sizePolicy().horizontalPolicy() & QSizePolicy::ExpandFlag) {
        if (m_stretchWidget)
            m_stretchWidget->deleteLater();
        m_stretchWidget = 0;
    }

    if (side == Right)
        m_toolBar->insertWidget(m_cursorPositionLabelAction, widget);
    else
        m_toolBar->insertWidget(m_toolBar->actions().first(), widget);
}

int BaseTextEditor::find(const QString &) const
{
    return 0;
}

int BaseTextEditor::currentLine() const
{
    return e->textCursor().blockNumber() + 1;
}

int BaseTextEditor::currentColumn() const
{
    QTextCursor cursor = e->textCursor();
    return cursor.position() - cursor.block().position() + 1;
}

int BaseTextEditor::columnCount() const
{
    return e->columnCount();
}

int BaseTextEditor::rowCount() const
{
    return e->rowCount();
}

QRect BaseTextEditor::cursorRect(int pos) const
{
    QTextCursor tc = e->textCursor();
    if (pos >= 0)
        tc.setPosition(pos);
    QRect result = e->cursorRect(tc);
    result.moveTo(e->viewport()->mapToGlobal(result.topLeft()));
    return result;
}

QString BaseTextEditor::contents() const
{
    return e->toPlainText();
}

QString BaseTextEditor::selectedText() const
{
    if (e->textCursor().hasSelection())
        return e->textCursor().selectedText();
    return QString();
}

QString BaseTextEditor::textAt(int pos, int length) const
{
    return Convenience::textAt(e->textCursor(), pos, length);
}

void BaseTextEditor::remove(int length)
{
    QTextCursor tc = e->textCursor();
    tc.setPosition(tc.position() + length, QTextCursor::KeepAnchor);
    tc.removeSelectedText();
}

void BaseTextEditor::insert(const QString &string)
{
    QTextCursor tc = e->textCursor();
    tc.insertText(string);
}

void BaseTextEditor::replace(int length, const QString &string)
{
    QTextCursor tc = e->textCursor();
    tc.setPosition(tc.position() + length, QTextCursor::KeepAnchor);
    tc.insertText(string);
}

void BaseTextEditor::setCursorPosition(int pos)
{
    QTextCursor tc = e->textCursor();
    tc.setPosition(pos);
    e->setTextCursor(tc);
}

void BaseTextEditor::select(int toPos)
{
    QTextCursor tc = e->textCursor();
    tc.setPosition(toPos, QTextCursor::KeepAnchor);
    e->setTextCursor(tc);
}

void BaseTextEditor::updateCursorPosition()
{
    const QTextCursor cursor = e->textCursor();
    const QTextBlock block = cursor.block();
    const int line = block.blockNumber() + 1;
    const int column = cursor.position() - block.position();
    m_cursorPositionLabel->setText(tr("Line: %1, Col: %2").arg(line).arg(e->tabSettings().columnAt(block.text(), column)+1),
                                   tr("Line: 9999, Col: 999"));
    m_contextHelpId.clear();

    if (!block.isVisible())
        e->ensureCursorVisible();

}

QString BaseTextEditor::contextHelpId() const
{
    if (m_contextHelpId.isEmpty())
        emit const_cast<BaseTextEditor*>(this)->contextHelpIdRequested(e->editor(),
                                                                               e->textCursor().position());
    return m_contextHelpId;
}

Internal::RefactorMarkers BaseTextEditorWidget::refactorMarkers() const
{
    return d->m_refactorOverlay->markers();
}

void BaseTextEditorWidget::setRefactorMarkers(const Internal::RefactorMarkers &markers)
{
    foreach (const RefactorMarker &marker, d->m_refactorOverlay->markers())
        requestBlockUpdate(marker.cursor.block());
    d->m_refactorOverlay->setMarkers(markers);
    foreach (const RefactorMarker &marker, markers)
        requestBlockUpdate(marker.cursor.block());
}

void BaseTextEditorWidget::doFoo() {
#ifdef DO_FOO
    qDebug() << Q_FUNC_INFO;
    RefactorMarkers markers = d->m_refactorOverlay->markers();
    RefactorMarker marker;
    marker.tooltip = "Hello World";
    marker.cursor = textCursor();
    markers += marker;
    setRefactorMarkers(markers);
#endif
}

void Internal::BaseTextBlockSelection::moveAnchor(int blockNumber, int visualColumn)
{
    if (visualColumn >= 0) {
        if (anchor % 2) {
            lastVisualColumn = visualColumn;
            if (lastVisualColumn < firstVisualColumn) {
                qSwap(firstVisualColumn, lastVisualColumn);
                anchor = (Anchor) (anchor - 1);
            }
        } else {
            firstVisualColumn = visualColumn;
            if (firstVisualColumn > lastVisualColumn) {
                qSwap(firstVisualColumn, lastVisualColumn);
                anchor = (Anchor) (anchor + 1);
            }
        }
    }

    if (blockNumber >= 0 && blockNumber < firstBlock.document()->blockCount()) {
        if (anchor <= TopRight) {
            firstBlock.setPosition(firstBlock.document()->findBlockByNumber(blockNumber).position());
            if (firstBlock.blockNumber() > lastBlock.blockNumber()) {
                qSwap(firstBlock, lastBlock);
                anchor = (Anchor) (anchor + 2);
            }
        } else {
            lastBlock.setPosition(firstBlock.document()->findBlockByNumber(blockNumber).position());
            if (lastBlock.blockNumber() < firstBlock.blockNumber()) {
                qSwap(firstBlock, lastBlock);
                anchor = (Anchor) (anchor - 2);
            }
        }
    }
    firstBlock.movePosition(QTextCursor::StartOfBlock);
    lastBlock.movePosition(QTextCursor::EndOfBlock);
}

QTextCursor Internal::BaseTextBlockSelection::selection(const TabSettings &ts) const
{
    QTextCursor cursor = firstBlock;
    if (anchor <= TopRight) {
        cursor.setPosition(lastBlock.block().position() + ts.positionAtColumn(lastBlock.block().text(), lastVisualColumn));
        cursor.setPosition(firstBlock.block().position() + ts.positionAtColumn(firstBlock.block().text(), firstVisualColumn),
                           QTextCursor::KeepAnchor);
    } else {
        cursor.setPosition(firstBlock.block().position() + ts.positionAtColumn(firstBlock.block().text(), firstVisualColumn));
        cursor.setPosition(lastBlock.block().position() + ts.positionAtColumn(lastBlock.block().text(), lastVisualColumn),
                           QTextCursor::KeepAnchor);
    }
    return cursor;
}

void Internal::BaseTextBlockSelection::fromSelection(const TabSettings &ts, const QTextCursor &selection)
{
    firstBlock = selection;
    firstBlock.setPosition(selection.selectionStart());
    firstVisualColumn = ts.columnAt(firstBlock.block().text(), firstBlock.positionInBlock());
    lastBlock = selection;
    lastBlock.setPosition(selection.selectionEnd());
    lastVisualColumn = ts.columnAt(lastBlock.block().text(), lastBlock.positionInBlock());
    if (selection.anchor() > selection.position())
        anchor = TopLeft;
    else
        anchor = BottomRight;

    firstBlock.movePosition(QTextCursor::StartOfBlock);
    lastBlock.movePosition(QTextCursor::EndOfBlock);
}
bool BaseTextEditorWidget::inFindScope(const QTextCursor &cursor)
{
    if (cursor.isNull())
        return false;
    return inFindScope(cursor.selectionStart(), cursor.selectionEnd());
}

bool BaseTextEditorWidget::inFindScope(int selectionStart, int selectionEnd)
{
    if (d->m_findScopeStart.isNull())
        return true; // no scope, everything is included
    if (selectionStart < d->m_findScopeStart.position())
        return false;
    if (selectionEnd > d->m_findScopeEnd.position())
        return false;
    if (d->m_findScopeVerticalBlockSelectionFirstColumn < 0)
        return true;
    QTextBlock block = document()->findBlock(selectionStart);
    if (block != document()->findBlock(selectionEnd))
        return false;
    QString text = block.text();
    const TabSettings &ts = tabSettings();
    int startPosition = ts.positionAtColumn(text, d->m_findScopeVerticalBlockSelectionFirstColumn);
    int endPosition = ts.positionAtColumn(text, d->m_findScopeVerticalBlockSelectionLastColumn);
    if (selectionStart - block.position() < startPosition)
        return false;
    if (selectionEnd - block.position() > endPosition)
        return false;
    return true;
}

void BaseTextEditorWidget::setBlockSelection(bool on)
{
    if (d->m_inBlockSelectionMode != on) {
        d->m_inBlockSelectionMode = on;
        if (on)
            d->m_blockSelection.fromSelection(tabSettings(), textCursor());
    }
    viewport()->update();
}

bool BaseTextEditorWidget::hasBlockSelection() const
{
    return d->m_inBlockSelectionMode;
}

void BaseTextEditorWidget::handleBlockSelection(int diff_row, int diff_col)
{

    if (!d->m_inBlockSelectionMode) {
        d->m_blockSelection.fromSelection(tabSettings(), textCursor());
        d->m_inBlockSelectionMode = true;
    }

    d->m_blockSelection.moveAnchor(d->m_blockSelection.anchorBlockNumber() + diff_row,
                                   d->m_blockSelection.anchorColumnNumber() + diff_col);
    setTextCursor(d->m_blockSelection.selection(tabSettings()));

    viewport()->update();

// ### TODO ensure horizontal visibility
//    const bool rtl = q->isRightToLeft();
//    if (cr.left() < visible.left() || cr.right() > visible.right()) {
//        int x = cr.center().x() + horizontalOffset() - visible.width()/2;
//        hbar->setValue(rtl ? hbar->maximum() - x : x);
//    }

}

int BaseTextEditorWidget::columnCount() const
{
    QFontMetricsF fm(font());
    return viewport()->rect().width() / fm.width(QLatin1Char('x'));
}

int BaseTextEditorWidget::rowCount() const
{
    QFontMetricsF fm(font());
    return viewport()->rect().height() / fm.lineSpacing();
}

/**
  Helper method to transform a selected text. If nothing is selected at the moment
  the word under the cursor is used.
  The type of the transformation is determined by the method pointer given.

  @param method     pointer to the QString method to use for the transformation

  @see uppercaseSelection, lowercaseSelection
*/
void BaseTextEditorWidget::transformSelection(Internal::TransformationMethod method)
{
    QTextCursor cursor = textCursor();

    int pos    = cursor.position();
    int anchor = cursor.anchor();

    if (!cursor.hasSelection()) {
        // if nothing is selected, select the word over the cursor
        cursor.select(QTextCursor::WordUnderCursor);
    }

    QString text = cursor.selectedText();
    QString transformedText = (text.*method)();

    if (transformedText == text) {
        // if the transformation does not do anything to the selection, do no create an undo step
        return;
    }

    cursor.insertText(transformedText);

    // (re)select the changed text
    // Note: this assumes the transformation did not change the length,
    cursor.setPosition(anchor);
    cursor.setPosition(pos, QTextCursor::KeepAnchor);
    setTextCursor(cursor);
}

void BaseTextEditorWidget::inSnippetMode(bool *active)
{
    *active = d->m_snippetOverlay->isVisible();
}

void BaseTextEditorWidget::invokeAssist(AssistKind kind, IAssistProvider *provider)
{
    if (overwriteMode())
        return;
    ensureCursorVisible();
    d->m_codeAssistant->invoke(kind, provider);
}

IAssistInterface *BaseTextEditorWidget::createAssistInterface(AssistKind kind,
                                                              AssistReason reason) const
{
    Q_UNUSED(kind);
    return new DefaultAssistInterface(document(), position(), d->m_document, reason);
}

QString TextEditor::BaseTextEditorWidget::foldReplacementText(const QTextBlock &) const
{
    return QLatin1String("...");
}