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

/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
**
** Alternatively, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
**
**************************************************************************/

#include "texteditor_global.h"

#include "basetextdocument.h"
#include "basetextdocumentlayout.h"
#include "basetexteditor_p.h"
#include "behaviorsettings.h"
#include "codecselector.h"
#include "completionsettings.h"
#include "completionsupport.h"
#include "tabsettings.h"
#include "texteditorconstants.h"
#include "texteditorplugin.h"
#include "syntaxhighlighter.h"
#include "tooltip.h"
#include "tipcontents.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/manhattanstyle.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 <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>

//#define DO_FOO

using namespace TextEditor;
using namespace TextEditor::Internal;

namespace TextEditor {
namespace Internal {

class TextEditExtraArea : public QWidget {
    BaseTextEditor *textEdit;
public:
    TextEditExtraArea(BaseTextEditor *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 wheelEvent(QWheelEvent *event) {
        QCoreApplication::sendEvent(textEdit->viewport(), event);
    }
};

} // namespace Internal
} // namespace TextEditor

ITextEditor *BaseTextEditor::openEditorAt(const QString &fileName, int line, int column,
                                 const QString &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) {
        texteditor->gotoLine(line, column);
        return texteditor;
    }

    return 0;
}

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:
            ;
        }
    }
}

BaseTextEditor::BaseTextEditor(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_requestAutoCompletionTimer = new QTimer(this);
    d->m_requestAutoCompletionTimer->setSingleShot(true);
    d->m_requestAutoCompletionTimer->setInterval(500);
    connect(d->m_requestAutoCompletionTimer, SIGNAL(timeout()), this, SLOT(_q_requestAutoCompletion()));

    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()));

    connect(Core::EditorManager::instance(), SIGNAL(currentEditorChanged(Core::IEditor*)),
            this, SLOT(currentEditorChanged(Core::IEditor*)));

    d->m_moveLineUndoHack = false;
}

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

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

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

void BaseTextEditor::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 *BaseTextEditor::markableInterface() const
{
    return baseTextDocument()->documentMarker();
}

BaseTextEditorEditable *BaseTextEditor::editableInterface() const
{
    if (!d->m_editable) {
        d->m_editable = const_cast<BaseTextEditor*>(this)->createEditableInterface();
        connect(this, SIGNAL(textChanged()),
                d->m_editable, SIGNAL(contentsChanged()));
        connect(this, SIGNAL(changed()),
                d->m_editable, SIGNAL(changed()));
    }
    return d->m_editable;
}


void BaseTextEditor::currentEditorChanged(Core::IEditor *editor)
{
    if (editor == editableInterface()) {
        if (d->m_document->hasDecodingError()) {
            Core::EditorManager::instance()->showEditorInfoBar(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())),
                tr("Select Encoding"),
                this, SLOT(selectEncoding()));
        }
    }
}

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

    switch (codecSelector.exec()) {
    case CodecSelector::Reload:
        doc->reload(codecSelector.selectedCodec());
        setReadOnly(d->m_document->hasDecodingError());
        if (doc->hasDecodingError())
            currentEditorChanged(Core::EditorManager::instance()->currentEditor());
        else
            Core::EditorManager::instance()->hideEditorInfoBar(QLatin1String(Constants::SELECT_ENCODING));
        break;
    case CodecSelector::Save:
        doc->setCodec(codecSelector.selectedCodec());
        Core::EditorManager::instance()->saveEditor(editableInterface());
        break;
    case CodecSelector::Cancel:
        break;
    }
}

void BaseTextEditor::triggerCompletions()
{
    emit requestAutoCompletion(editableInterface(), true);
}

void BaseTextEditor::triggerQuickFix()
{
    emit requestQuickFix(editableInterface());
}

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

bool BaseTextEditor::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;
}

bool BaseTextEditor::open(const QString &fileName)
{
    if (d->m_document->open(fileName)) {
        moveCursor(QTextCursor::Start);
        setReadOnly(d->m_document->hasDecodingError());
        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 &BaseTextEditor::changeSet() const
{
    return d->m_changeSet;
}

void BaseTextEditor::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 *BaseTextEditor::file()
{
    return d->m_document;
}

void BaseTextEditor::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);
        if (!d->m_snippetOverlay->hasCursorInSelection(cursor)) {
            d->m_snippetOverlay->hide();
            d->m_snippetOverlay->clear();
        }
    }

    if (doc->isRedoAvailable())
        emit editableInterface()->contentsChangedBecauseOfUndo();
}

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

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

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

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


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

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

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

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

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

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

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

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

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

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

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

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

void BaseTextEditor::gotoPreviousWord()
{
    moveCursor(QTextCursor::PreviousWord);
}

void BaseTextEditor::gotoPreviousWordWithSelection()
{
    moveCursor(QTextCursor::PreviousWord, QTextCursor::KeepAnchor);
}

void BaseTextEditor::gotoNextWord()
{
    moveCursor(QTextCursor::NextWord);
}

void BaseTextEditor::gotoNextWordWithSelection()
{
    moveCursor(QTextCursor::NextWord, QTextCursor::KeepAnchor);
}



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

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


    if (!TextBlockUserData::findPreviousOpenParenthesis(&cursor, false))
        return;
    if (!TextBlockUserData::findNextClosingParenthesis(&cursor, true))
        return;
    setTextCursor(flippedCursor(cursor));
    _q_matchParentheses();
}

void BaseTextEditor::selectBlockDown()
{
    QTextCursor tc = textCursor();
    QTextCursor cursor = d->m_selectBlockAnchor;

    if (!tc.hasSelection() || cursor.isNull())
        return;
    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();
}

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

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

void BaseTextEditor::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(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 BaseTextEditor::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("^\\s*"), " ");
        cursor.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor);
        cursor.removeSelectedText();

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

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

    setTextCursor(cursor);
}

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

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

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

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

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

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

    if (e->key() == Qt::Key_Escape) {
        if (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();

    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();
        cursor.beginEditBlock();

        int extraBlocks = paragraphSeparatorAboutToBeInserted(cursor); // virtual

        if (ts.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();
            cursor.insertText(ts.indentationString(previousBlockText));
        }
        cursor.endEditBlock();
        e->accept();

        if (extraBlocks > 0) {
            QTextCursor ensureVisible = cursor;
            while (extraBlocks > 0) {
                --extraBlocks;
                ensureVisible.movePosition(QTextCursor::NextBlock);
            }
            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->tabSettings().m_autoIndent
               && !textCursor().hasSelection()){
        e->accept();
        QTextCursor c = textCursor();
        int pos = c.position();
        c.movePosition(QTextCursor::PreviousWord);
        int targetpos = c.position();
        forever {
            handleBackspaceKey();
            int cpos = textCursor().position();
            if (cpos == pos || cpos <= targetpos)
                break;
            pos = cpos;
        }
        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->tabSettings().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_WS_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;

    default:
        break;
    }

    if (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 (d->m_snippetOverlay->isVisible()
        && (e->key() == Qt::Key_Delete || e->key() == Qt::Key_Backspace)) {
        d->snippetCheckCursor(textCursor());
    }

    if (ro || e->text().isEmpty() || !e->text().at(0).isPrint()) {
        QPlainTextEdit::keyPressEvent(e);
    } else if ((e->modifiers() & (Qt::ControlModifier|Qt::AltModifier)) != Qt::ControlModifier){
        QTextCursor cursor = textCursor();
        QString text = e->text();
        QString autoText = autoComplete(cursor, text);

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

        if (d->m_snippetOverlay->isVisible())
            d->snippetCheckCursor(cursor);

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

        cursor.insertText(text);

        if (!autoText.isEmpty()) {
            int pos = cursor.position();
            cursor.insertText(autoText);
            cursor.setPosition(pos);
        }
        if (!electricChar.isNull() && contextAllowsElectricCharacters(cursor))
            indent(document(), cursor, electricChar);

        if (doEditBlock)
            cursor.endEditBlock();

        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()) {
        maybeRequestAutoCompletion(e->text().at(0));
    }

}

void BaseTextEditor::maybeRequestAutoCompletion(const QChar &ch)
{
    if (ch.isLetterOrNumber() || ch == QLatin1Char('_')) {
        d->m_requestAutoCompletionRevision = document()->revision();
        d->m_requestAutoCompletionPosition = position();
        d->m_requestAutoCompletionTimer->start();
    } else {
        d->m_requestAutoCompletionTimer->stop();
        emit requestAutoCompletion(editableInterface(), false);
    }
}

void BaseTextEditor::_q_requestAutoCompletion()
{
    d->m_requestAutoCompletionTimer->stop();

    if (CompletionSupport::instance()->isActive())
        return;

    if (d->m_requestAutoCompletionRevision == document()->revision() &&
            d->m_requestAutoCompletionPosition == position())
        emit requestAutoCompletion(editableInterface(), false);
}

void BaseTextEditor::insertCodeSnippet(const QTextCursor &cursor_arg, const QString &snippet)
{
    if ((snippet.count('$') % 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) != QChar::ObjectReplacementCharacter) {
            const int start = pos;
            do { ++pos; }
            while (pos < snippet.size() && snippet.at(pos) != QChar::ObjectReplacementCharacter);
            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) == QChar::ObjectReplacementCharacter)
                    break;
            }

            Q_ASSERT(pos < snippet.size());
            Q_ASSERT(snippet.at(pos) == QChar::ObjectReplacementCharacter);

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

void BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::convertPosition(int pos, int *line, int *column) const
{
    QTextBlock block = document()->findBlock(pos);
    if (!block.isValid()) {
        (*line) = -1;
        (*column) = -1;
    } else {
        (*line) = block.blockNumber() + 1;
        (*column) = pos - block.position();
    }
}

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

bool BaseTextEditor::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 BaseTextEditor::duplicateFrom(BaseTextEditor *editor)
{
    if (this == editor)
        return;
    setDisplayName(editor->displayName());
    d->m_revisionsVisible = editor->d->m_revisionsVisible;
    if (d->m_document == editor->d->m_document)
        return;
    d->setupDocumentSignals(editor->d->m_document);
    d->m_document = editor->d->m_document;
}

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

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

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

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

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

QByteArray BaseTextEditor::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 BaseTextEditor::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();
        foreach(int blockNumber, collapsedBlocks) {
            QTextBlock block = doc->findBlockByNumber(qMax(0, blockNumber));
            if (block.isValid())
                BaseTextDocumentLayout::doFoldOrUnfold(block, false);
        }
    } 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 BaseTextEditor::setDefaultPath(const QString &defaultPath)
{
    baseTextDocument()->setDefaultPath(defaultPath);
}

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

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

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

void BaseTextEditor::setAutoParenthesesEnabled(bool b)
{
    d->m_autoParenthesesEnabled = b;
}

bool BaseTextEditor::isAutoParenthesesEnabled() const
{
    return d->m_autoParenthesesEnabled;
}

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

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

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

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

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

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

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

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

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

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

void BaseTextEditor::setCodeFoldingVisible(bool b)
{
    d->m_codeFoldingVisible = b && d->m_codeFoldingSupported;
    slotUpdateExtraAreaWidth();
}

bool BaseTextEditor::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 BaseTextEditor::setCodeFoldingSupported(bool b)
{
    d->m_codeFoldingSupported = b;
}

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

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

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

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

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

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

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

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

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

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

BaseTextEditorPrivate::BaseTextEditorPrivate()
    :
    m_lastScrollPos(-1),
    m_lineNumber(-1),
    q(0),
    m_contentsChanged(false),
    m_lastCursorChangeWasInteresting(false),
    m_allowSkippingOfBlockEnd(false),
    m_document(new BaseTextDocument),
    m_parenthesesMatchingEnabled(false),
    m_autoParenthesesEnabled(true),
    m_updateTimer(0),
    m_formatRange(false),
    m_parenthesesMatchingTimer(0),
    m_extraArea(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_visibleWrapColumn(0),
    m_linkPressed(false),
    m_delayedUpdateTimer(0),
    m_editable(0),
    m_actionHack(0),
    m_inBlockSelectionMode(false),
    m_moveLineUndoHack(false),
    m_findScopeVerticalBlockSelectionFirstColumn(-1),
    m_findScopeVerticalBlockSelectionLastColumn(-1),
    m_highlightBlocksTimer(0),
    m_requestAutoCompletionRevision(0),
    m_requestAutoCompletionPosition(0),
    m_requestAutoCompletionTimer(0),
    m_cursorBlockNumber(-1)
{
}

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();
}


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

    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->setVisible(false);
        m_snippetOverlay->clear();
    }
}

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->m_selections.count(); ++i){
            const OverlaySelection &selection = m_snippetOverlay->m_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->m_selections.count()-1; i >= 0; --i){
            const OverlaySelection &selection = m_snippetOverlay->m_selections.at(i);
            if (selection.m_cursor_end.position() < cursor.position()) {
                final = selection;
                break;
            }
        }

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


bool BaseTextEditor::viewportEvent(QEvent *event)
{
    d->m_contentsChanged = false;
    if (event->type() == QEvent::ContextMenu) {
        const QContextMenuEvent *ce = static_cast<QContextMenuEvent*>(event);
        if (ce->reason() == QContextMenuEvent::Mouse && !textCursor().hasSelection())
            setTextCursor(cursorForPosition(ce->pos()));
    } else if (event->type() == QEvent::ToolTip) {
        const QHelpEvent *he = static_cast<QHelpEvent*>(event);
        if (QApplication::keyboardModifiers() & Qt::ControlModifier)
            return true; // eat tooltip event when control is pressed
        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;
        }

        // Allow plugins to show tooltips
        const QTextCursor &c = cursorForPosition(pos);
        QPoint cursorPos = mapToGlobal(cursorRect(c).bottomRight() + QPoint(1,1));
        cursorPos.setX(cursorPos.x() + d->m_extraArea->width());

        emit editableInterface()->tooltipRequested(editableInterface(), cursorPos, c.position());
        return true;
    }
    return QPlainTextEdit::viewportEvent(event);
}


void BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::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);

                QRectF collapseRect(lineRect.right() + 12,
                                    lineRect.top(),
                                    fontMetrics().width(QLatin1String(" {...}; ")),
                                    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 BaseTextEditor::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) {
        lineX = fontMetrics().averageCharWidth() * 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.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) {
                QRectF rr = r;
                rr.setWidth(viewport()->width());
                if (lineX > 0)
                    rr.setRight(qMin(lineX, rr.right()));
                for (int i = 0; i <= depth; ++i) {
                    int vi = i > 0 ? d->m_highlightBlocksInfo.visualIndent.at(i-1) : 0;
                    painter.fillRect(rr.adjusted(vi, 0, -8*i, 0), calcBlendColor(baseColor, i, count));
                }
            }
            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());
            }
        }
    }

    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;
    }

    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


    // 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());
            }

        }
    }



    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()) {

            if (BaseTextDocumentLayout::ifdefedOut(block)) {
                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());
            }

            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_WS_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);

                QRectF collapseRect(lineRect.right() + 12,
                                    lineRect.top(),
                                    fontMetrics().width(QLatin1String(" {...}; ")),
                                    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);

                QString replacement = QLatin1String("...");

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

int BaseTextEditor::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 += 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 BaseTextEditor::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 BaseTextEditor::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::Base));
    painter.fillRect(e->rect().intersected(QRect(0, 0, extraAreaWidth, INT_MAX)),
                     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);

            int previousBraceDepth = block.previous().userState();
            if (previousBraceDepth >= 0)
                previousBraceDepth >>= 8;
            else
                previousBraceDepth = 0;

            int braceDepth = block.userState();
            if (!nextBlock.isVisible()) {
                QTextBlock lastInvisibleBlock = nextVisibleBlock.previous();
                if (!lastInvisibleBlock.isValid())
                    lastInvisibleBlock = doc->lastBlock();
                braceDepth = lastInvisibleBlock.userState();
            }
            if (braceDepth >= 0)
                braceDepth >>= 8;
            else
                braceDepth = 0;

            if (TextBlockUserData *userData = static_cast<TextBlockUserData*>(block.userData())) {
                if (d->m_marksVisible) {
                    int xoffset = 0;
                    foreach (ITextMark *mrk, userData->marks()) {
                        int x = 0;
                        int radius = fmLineSpacing - 1;
                        QRect r(x + xoffset, top, radius, radius);
                        mrk->icon().paint(&painter, r, Qt::AlignCenter);
                        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 BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::saveCurrentCursorPositionForNavigation()
{
    d->m_lastCursorChangeWasInteresting = true;
    d->m_tempNavigationState = saveState();
}

void BaseTextEditor::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 BaseTextEditor::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(editableInterface(), d->m_tempNavigationState);
        d->m_lastCursorChangeWasInteresting = false;
    } else if (d->m_contentsChanged) {
        saveCurrentCursorPositionForNavigation();
    }
    updateHighlights();
}

void BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::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()) {
            qDebug() << "refactorMarkerClicked" << refactorMarker.cursor.position();
            emit refactorMarkerClicked(refactorMarker);
        } else {
            updateLink(e);

            if (d->m_currentLink.isValid())
                d->m_linkPressed = true;
        }
    }

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

    QPlainTextEdit::mousePressEvent(e);
}

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

void BaseTextEditor::keyReleaseEvent(QKeyEvent *e)
{
    // Clear link emulation when Ctrl is released
    if (e->key() == Qt::Key_Control)
        clearLink();

    QPlainTextEdit::keyReleaseEvent(e);
}

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

void BaseTextEditor::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->m_marksVisible && e->button() == Qt::RightButton) {
            QMenu * contextMenu = new QMenu(this);
            emit editableInterface()->markContextMenuRequested(editableInterface(), cursor.blockNumber() + 1, contextMenu);
            if (!contextMenu->isEmpty())
                contextMenu->exec(e->globalPos());
            delete contextMenu;
        }
    } 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;
                emit editableInterface()->markRequested(editableInterface(), line);
            }
        }
    }
}

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

void BaseTextEditor::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 &BaseTextEditor::tabSettings() const
{
    return d->m_document->tabSettings();
}

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


void BaseTextEditor::indentOrUnindent(bool doIndent)
{
    QTextCursor cursor = textCursor();
    maybeClearSomeExtraSelections(cursor);
    cursor.beginEditBlock();

    int pos = cursor.position();
    const TextEditor::TabSettings &tabSettings = d->m_document->tabSettings();

    QTextDocument *doc = document();

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

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

        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();
        }
    } else {
        // 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();
}

void BaseTextEditor::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);
}


#define SET_AND_RETURN(cursor) setTextCursor(cursor); return  // make cursor visible and reset vertical x movement
void BaseTextEditor::handleBackspaceKey()
{
    QTextCursor cursor = textCursor();
    int pos = cursor.position();
    QTC_ASSERT(!cursor.hasSelection(), return);

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

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

    if (tabSettings.m_autoIndent && autoBackspace(cursor))
        return;

    if (!tabSettings.m_smartBackspace) {
        cursor.deletePreviousChar();
        SET_AND_RETURN(cursor);
    }

    QTextBlock currentBlock = cursor.block();
    int positionInBlock = pos - currentBlock.position();
    const QString blockText = currentBlock.text();
    if (cursor.atBlockStart() || tabSettings.firstNonSpace(blockText) < positionInBlock) {
        cursor.deletePreviousChar();
        SET_AND_RETURN(cursor);
    }

    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();
            SET_AND_RETURN(cursor);
        }
    }
    cursor.deletePreviousChar();
    SET_AND_RETURN(cursor);
}

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

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

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

bool BaseTextEditor::isElectricCharacter(QChar) const
{
    return false;
}

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

void BaseTextEditor::countBracket(QChar open, QChar close, QChar c, int *errors, int *stillopen)
{
    if (c == open)
        ++*stillopen;
    else if (c == close)
        --*stillopen;

    if (*stillopen < 0) {
        *errors += -1 * (*stillopen);
        *stillopen = 0;
    }
}

void BaseTextEditor::countBrackets(QTextCursor cursor, int from, int end, QChar open, QChar close, int *errors, int *stillopen)
{
    cursor.setPosition(from);
    QTextBlock block = cursor.block();
    while (block.isValid() && block.position() < end) {
        TextEditor::Parentheses parenList = TextEditor::BaseTextDocumentLayout::parentheses(block);
        if (!parenList.isEmpty() && !TextEditor::BaseTextDocumentLayout::ifdefedOut(block)) {
            for (int i = 0; i < parenList.count(); ++i) {
                TextEditor::Parenthesis paren = parenList.at(i);
                int position = block.position() + paren.pos;
                if (position < from || position >= end)
                    continue;
                countBracket(open, close, paren.chr, errors, stillopen);
            }
        }
        block = block.next();
    }
}

bool BaseTextEditor::contextAllowsAutoParentheses(const QTextCursor &cursor,
                                                  const QString &textToInsert) const
{
    Q_UNUSED(cursor);
    Q_UNUSED(textToInsert);
    return false;
}

bool BaseTextEditor::contextAllowsElectricCharacters(const QTextCursor &cursor) const
{
    return contextAllowsAutoParentheses(cursor);
}

bool BaseTextEditor::isInComment(const QTextCursor &cursor) const
{
    Q_UNUSED(cursor);
    return false;
}

QString BaseTextEditor::insertMatchingBrace(const QTextCursor &tc, const QString &text,
                                            QChar la, int *skippedChars) const
{
    Q_UNUSED(tc);
    Q_UNUSED(text);
    Q_UNUSED(la);
    Q_UNUSED(skippedChars);
    return QString();
}

QString BaseTextEditor::insertParagraphSeparator(const QTextCursor &tc) const
{
    Q_UNUSED(tc);
    return QString();
}

QString BaseTextEditor::autoComplete(QTextCursor &cursor, const QString &textToInsert) const
{
    const bool checkBlockEnd = d->m_allowSkippingOfBlockEnd;
    d->m_allowSkippingOfBlockEnd = false; // consume blockEnd.

    if (!d->m_autoParenthesesEnabled)
        return QString();

    if (!contextAllowsAutoParentheses(cursor, textToInsert))
        return QString();

    const QString text = textToInsert;
    const QChar lookAhead = characterAt(cursor.selectionEnd());

    const QChar character = textToInsert.at(0);
    const QString parentheses = QLatin1String("()");
    const QString brackets = QLatin1String("[]");
    if (parentheses.contains(character) || brackets.contains(character)) {
        QTextCursor tmp= cursor;
        bool foundBlockStart = TextEditor::TextBlockUserData::findPreviousBlockOpenParenthesis(&tmp);
        int blockStart = foundBlockStart ? tmp.position() : 0;
        tmp = cursor;
        bool foundBlockEnd = TextEditor::TextBlockUserData::findNextBlockClosingParenthesis(&tmp);
        int blockEnd = foundBlockEnd ? tmp.position() : (cursor.document()->characterCount() - 1);
        const QChar openChar = parentheses.contains(character) ? QLatin1Char('(') : QLatin1Char('[');
        const QChar closeChar = parentheses.contains(character) ? QLatin1Char(')') : QLatin1Char(']');

        int errors = 0;
        int stillopen = 0;
        countBrackets(cursor, blockStart, blockEnd, openChar, closeChar, &errors, &stillopen);
        int errorsBeforeInsertion = errors + stillopen;
        errors = 0;
        stillopen = 0;
        countBrackets(cursor, blockStart, cursor.position(), openChar, closeChar, &errors, &stillopen);
        countBracket(openChar, closeChar, character, &errors, &stillopen);
        countBrackets(cursor, cursor.position(), blockEnd, openChar, closeChar, &errors, &stillopen);
        int errorsAfterInsertion = errors + stillopen;
        if (errorsAfterInsertion < errorsBeforeInsertion)
            return QString(); // insertion fixes parentheses or bracket errors, do not auto complete
    }

    int skippedChars = 0;
    const QString autoText = insertMatchingBrace(cursor, text, lookAhead, &skippedChars);

    if (checkBlockEnd && textToInsert.at(0) == QLatin1Char('}')) {
        if (textToInsert.length() > 1)
            qWarning() << "*** handle event compression";

        int startPos = cursor.selectionEnd(), pos = startPos;
        while (characterAt(pos).isSpace())
            ++pos;

        if (characterAt(pos) == QLatin1Char('}'))
            skippedChars += (pos - startPos) + 1;
    }

    if (skippedChars) {
        const int pos = cursor.position();
        cursor.setPosition(pos + skippedChars);
        cursor.setPosition(pos, QTextCursor::KeepAnchor);
    }

    return autoText;
}

bool BaseTextEditor::autoBackspace(QTextCursor &cursor)
{
    d->m_allowSkippingOfBlockEnd = false;

    if (!d->m_autoParenthesesEnabled)
        return false;

    int pos = cursor.position();
    if (pos == 0)
        return false;
    QTextCursor c = cursor;
    c.setPosition(pos - 1);

    const QChar lookAhead = characterAt(pos);
    const QChar lookBehind = characterAt(pos - 1);
    const QChar lookFurtherBehind = characterAt(pos - 2);

    const QChar character = lookBehind;
    if (character == QLatin1Char('(') || character == QLatin1Char('[')) {
        QTextCursor tmp = cursor;
        TextEditor::TextBlockUserData::findPreviousBlockOpenParenthesis(&tmp);
        int blockStart = tmp.isNull() ? 0 : tmp.position();
        tmp = cursor;
        TextEditor::TextBlockUserData::findNextBlockClosingParenthesis(&tmp);
        int blockEnd = tmp.isNull() ? (cursor.document()->characterCount()-1) : tmp.position();
        QChar openChar = character;
        QChar closeChar = (character == QLatin1Char('(')) ? QLatin1Char(')') : QLatin1Char(']');

        int errors = 0;
        int stillopen = 0;
        countBrackets(cursor, blockStart, blockEnd, openChar, closeChar, &errors, &stillopen);
        int errorsBeforeDeletion = errors + stillopen;
        errors = 0;
        stillopen = 0;
        countBrackets(cursor, blockStart, pos - 1, openChar, closeChar, &errors, &stillopen);
        countBrackets(cursor, pos, blockEnd, openChar, closeChar, &errors, &stillopen);
        int errorsAfterDeletion = errors + stillopen;

        if (errorsAfterDeletion < errorsBeforeDeletion)
            return false; // insertion fixes parentheses or bracket errors, do not auto complete
    }

    // ### this code needs to be generalized
    if    ((lookBehind == QLatin1Char('(') && lookAhead == QLatin1Char(')'))
        || (lookBehind == QLatin1Char('[') && lookAhead == QLatin1Char(']'))
        || (lookBehind == QLatin1Char('"') && lookAhead == QLatin1Char('"')
            && lookFurtherBehind != QLatin1Char('\\'))
        || (lookBehind == QLatin1Char('\'') && lookAhead == QLatin1Char('\'')
            && lookFurtherBehind != QLatin1Char('\\'))) {
        if (! isInComment(c)) {
            cursor.beginEditBlock();
            cursor.deleteChar();
            cursor.deletePreviousChar();
            cursor.endEditBlock();
            return true;
        }
    }
    return false;
}

int BaseTextEditor::paragraphSeparatorAboutToBeInserted(QTextCursor &cursor)
{
    if (!d->m_autoParenthesesEnabled)
        return 0;

    if (characterAt(cursor.position() - 1) != QLatin1Char('{'))
        return 0;

    if (!contextAllowsAutoParentheses(cursor))
        return 0;

    // verify that we indeed do have an extra opening brace in the document
    int braceDepth = BaseTextDocumentLayout::braceDepth(document()->lastBlock());

    if (braceDepth <= 0)
        return 0; // braces are all balanced or worse, no need to do anything

    // we have an extra brace , let's see if we should close it


    /* verify that the next block is not further intended compared to the current block.
       This covers the following case:

            if (condition) {|
                statement;
    */
    const TabSettings &ts = tabSettings();
    QTextBlock block = cursor.block();
    int indentation = ts.indentationColumn(block.text());

    if (block.next().isValid()) { // not the last block
        block = block.next();
        //skip all empty blocks
        while (block.isValid() && ts.onlySpace(block.text()))
            block = block.next();
        if (block.isValid()
                && ts.indentationColumn(block.text()) > indentation)
            return 0;
    }

    int pos = cursor.position();

    const QString textToInsert = insertParagraphSeparator(cursor);

    cursor.insertText(textToInsert);
    cursor.setPosition(pos);
    if (ts.m_autoIndent) {
        cursor.insertBlock();
        indent(document(), cursor, QChar::Null);
    } else {
        QString previousBlockText = cursor.block().text();
        cursor.insertBlock();
        cursor.insertText(ts.indentationString(previousBlockText));
    }
    cursor.setPosition(pos);
    d->m_allowSkippingOfBlockEnd = true;
    return 1;
}

void BaseTextEditor::indentBlock(QTextDocument *, QTextBlock, QChar)
{
}

void BaseTextEditor::indent(QTextDocument *doc, const QTextCursor &cursor, QChar typedChar)
{
    maybeClearSomeExtraSelections(cursor);
    if (cursor.hasSelection()) {
        QTextBlock block = doc->findBlock(cursor.selectionStart());
        const QTextBlock end = doc->findBlock(cursor.selectionEnd()).next();
        do {
            indentBlock(doc, block, typedChar);
            block = block.next();
        } while (block.isValid() && block != end);
    } else {
        indentBlock(doc, cursor.block(), typedChar);
    }
}

void BaseTextEditor::reindent(QTextDocument *doc, const QTextCursor &cursor)
{
    maybeClearSomeExtraSelections(cursor);
    if (cursor.hasSelection()) {
        QTextBlock block = doc->findBlock(cursor.selectionStart());
        const QTextBlock end = doc->findBlock(cursor.selectionEnd()).next();

        const TabSettings &ts = d->m_document->tabSettings();

        // skip empty blocks
        while (block.isValid() && block != end) {
            QString bt = block.text();
            if (ts.firstNonSpace(bt) < bt.size())
                break;
            indentBlock(doc, block, QChar::Null);
            block = block.next();
        }

        int previousIndentation = ts.indentationColumn(block.text());
        indentBlock(doc, block, QChar::Null);
        int currentIndentation = ts.indentationColumn(block.text());
        int delta = currentIndentation - previousIndentation;

        block = block.next();
        while (block.isValid() && block != end) {
            ts.reindentLine(block, delta);
            block = block.next();
        }
    } else {
        indentBlock(doc, cursor.block(), QChar::Null);
    }
}


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

bool BaseTextEditor::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, QString(),
                          Core::EditorManager::IgnoreNavigationHistory
                        | Core::EditorManager::ModeSwitch);
}

void BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::highlightSearchResults(const QString &txt, Find::FindFlags findFlags)
{
    QString pattern = txt;
    if (pattern.size() < 2)
        pattern.clear(); // highlighting single characters is a bit pointless

    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(10);
}

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

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

QRegion BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::_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 BaseTextEditor::_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, BaseTextEditor::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 BaseTextEditor::_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 BaseTextEditor::setActionHack(QObject *hack)
{
    d->m_actionHack = hack;
}

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

void BaseTextEditor::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.setPointSize(font().pointSize());
            d->m_extraArea->setFont(f);
            slotUpdateExtraAreaWidth();
            d->m_extraArea->update();
        }
    }
}

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

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


void BaseTextEditor::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 BaseTextEditor::cutLine()
{
    maybeSelectLine();
    cut();
}

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

void BaseTextEditor::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->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> BaseTextEditor::extraSelections(ExtraSelectionKind kind) const
{
    return d->m_extraSelections[kind];
}

void BaseTextEditor::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 BaseTextEditor::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 BaseTextEditor::setIfdefedOutBlocks(const QList<BaseTextEditor::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 BaseTextEditor::format()
{
    QTextCursor cursor = textCursor();
    cursor.beginEditBlock();
    indent(document(), cursor, QChar::Null);
    cursor.endEditBlock();
}

void BaseTextEditor::rewrapParagraph()
{
    const int paragraphWidth = displaySettings().m_wrapColumn;
    const QRegExp anyLettersOrNumbers = QRegExp("\\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 BaseTextEditor::unCommentSelection()
{
}

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


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

void BaseTextEditor::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 BaseTextEditor::setTabSettings(const TabSettings &ts)
{
    d->m_document->setTabSettings(ts);
    int charWidth = QFontMetrics(font()).width(QChar(' '));
    setTabStopWidth(charWidth * ts.m_tabSize);
}

void BaseTextEditor::setDisplaySettings(const DisplaySettings &ds)
{
    setLineWrapMode(ds.m_textWrapping ? QPlainTextEdit::WidgetWidth : QPlainTextEdit::NoWrap);
    setLineNumbersVisible(ds.m_displayLineNumbers);
    setVisibleWrapColumn(ds.m_showWrapColumn ? ds.m_wrapColumn : 0);
    setCodeFoldingVisible(ds.m_displayFoldingMarkers);
    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();
    }

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

void BaseTextEditor::setBehaviorSettings(const TextEditor::BehaviorSettings &bs)
{
    setMouseNavigationEnabled(bs.m_mouseNavigation);
    setScrollWheelZoomingEnabled(bs.m_scrollWheelZooming);
}

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

void BaseTextEditor::setCompletionSettings(const TextEditor::CompletionSettings &completionSettings)
{
    setAutoParenthesesEnabled(completionSettings.m_autoInsertBrackets);
}

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

QTextCodec *BaseTextEditor::textCodec() const
{
    return baseTextDocument()->codec();
}

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

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

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

QMimeData *BaseTextEditor::createMimeDataFromSelection() const
{
    if (d->m_inBlockSelectionMode) {
        QMimeData *mimeData = new QMimeData;
        QString text = d->copyBlockSelection();
        mimeData->setData(QLatin1String("application/vnd.nokia.qtcreator.vblocktext"), 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("application/vnd.nokia.qtcreator.blocktext"), text.toUtf8());
        }
        return mimeData;
    }
    return 0;
}

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

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

    if (source->hasFormat(QLatin1String("application/vnd.nokia.qtcreator.vblocktext"))) {
        QString text = QString::fromUtf8(source->data(QLatin1String("application/vnd.nokia.qtcreator.vblocktext")));
        if (text.isEmpty())
            return;

        if (CompletionSupport::instance()->isActive())
            setFocus();

        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 (CompletionSupport::instance()->isActive())
        setFocus();

    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();
    QTextCursor cursor = textCursor();
    if (!ts.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("application/vnd.nokia.qtcreator.blocktext"))) {
        text = QString::fromUtf8(source->data(QLatin1String("application/vnd.nokia.qtcreator.blocktext")));
        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);
}

void BaseTextEditor::appendStandardContextMenuActions(QMenu *menu)
{
    menu->addSeparator();
    Core::ActionManager *am = Core::ICore::instance()->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);
}


BaseTextEditorEditable::BaseTextEditorEditable(BaseTextEditor *editor)
  : e(editor)
{
    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;

    QHBoxLayout *l = new QHBoxLayout;
    QWidget *w = new QWidget;
    l->setMargin(0);
    l->setContentsMargins(5, 0, 5, 0);
    l->addStretch(0);
    l->addWidget(m_cursorPositionLabel);
    w->setLayout(l);

    m_toolBar = new QToolBar;
    m_toolBar->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    m_toolBar->addWidget(w);

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

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

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

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

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

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

QRect BaseTextEditorEditable::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 BaseTextEditorEditable::contents() const
{
    return e->toPlainText();
}

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

QString BaseTextEditorEditable::textAt(int pos, int length) const
{
    QTextCursor c = e->textCursor();

    if (pos < 0)
        pos = 0;
    c.movePosition(QTextCursor::End);
    if (pos + length > c.position())
        length = c.position() - pos;

    c.setPosition(pos);
    c.setPosition(pos + length, QTextCursor::KeepAnchor);

    return c.selectedText();
}

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

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

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

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

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

void BaseTextEditorEditable::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: %1, Col: 999").arg(e->blockCount()));
    m_contextHelpId.clear();

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

}

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


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

void BaseTextEditor::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 BaseTextEditor::inFindScope(const QTextCursor &cursor)
{
    if (cursor.isNull())
        return false;
    return inFindScope(cursor.selectionStart(), cursor.selectionEnd());
}

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

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

void BaseTextEditor::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);
//    }

}