Initial import

src/plugins/texteditor/codecselector.cpp

@@ -0,0 +1,179 @@
+/***************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact:  Qt Software Information (qt-info@nokia.com)
+**
+** 
+** Non-Open Source Usage  
+** 
+** Licensees may use this file in accordance with the Qt Beta Version
+** License Agreement, Agreement version 2.2 provided with the Software or,
+** alternatively, in accordance with the terms contained in a written
+** agreement between you and Nokia.  
+** 
+** GNU General Public License Usage 
+** 
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the packaging
+** of this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+**
+** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt GPL Exception version
+** 1.2, included in the file GPL_EXCEPTION.txt in this package.  
+** 
+***************************************************************************/
+#include "codecselector.h"
+#include "basetextdocument.h"
+
+
+#include <QtCore/QDebug>
+#include <QtCore/QFileInfo>
+#include <QtCore/QTextCodec>
+#include <QtGui/QPushButton>
+#include <QtGui/QScrollBar>
+#include <QtGui/QVBoxLayout>
+
+using namespace TextEditor;
+using namespace TextEditor::Internal;
+
+
+namespace TextEditor {
+    namespace Internal {
+
+        /* custom class to make sure the width is wide enough for the
+         * contents. Should be easier with Qt. */
+        class CodecListWidget : public QListWidget {
+        public:
+            CodecListWidget(QWidget *parent):QListWidget(parent){}
+            QSize sizeHint() const {
+                return QListWidget::sizeHint().expandedTo(
+                    QSize(sizeHintForColumn(0) + verticalScrollBar()->sizeHint().width() + 4, 0));
+            }
+        };
+    }
+}
+
+CodecSelector::CodecSelector(QWidget *parent, BaseTextDocument *doc)
+    : QDialog(parent)
+{
+    m_hasDecodingError = doc->hasDecodingError();
+    m_isModified = doc->isModified();
+
+    QByteArray buf;
+    if (m_hasDecodingError)
+        buf = doc->decodingErrorSample();
+
+    setWindowTitle(tr("Text Encoding"));
+    m_label = new QLabel(this);
+    QString decodingErrorHint;
+    if (m_hasDecodingError)
+        decodingErrorHint = tr("\nThe following encodings are likely to fit:");
+    m_label->setText(tr("Select encoding for \"%1\".%2").arg(QFileInfo(doc->fileName()).fileName()).arg(decodingErrorHint));
+
+    m_listWidget = new CodecListWidget(this);
+
+    QStringList encodings;
+
+    QList<int> mibs = QTextCodec::availableMibs();
+    qSort(mibs);
+    QList<int> sortedMibs;
+    foreach(int mib, mibs)
+        if (mib >= 0)
+            sortedMibs += mib;
+    foreach(int mib, mibs)
+        if (mib < 0)
+            sortedMibs += mib;
+
+    int currentIndex = -1;
+    foreach(int mib, sortedMibs) {
+        QTextCodec *c = QTextCodec::codecForMib(mib);
+        if (!buf.isEmpty()) {
+
+            // slow, should use a feature from QTextCodec or QTextDecoder (but those are broken currently)
+            QByteArray verifyBuf = c->fromUnicode(c->toUnicode(buf));
+            // the minSize trick lets us ignore unicode headers
+            int minSize = qMin(verifyBuf.size(), buf.size());
+            if (minSize < buf.size() - 4
+                || memcmp(verifyBuf.constData() + verifyBuf.size() - minSize,
+                          buf.constData() + buf.size() - minSize, minSize))
+                continue;
+        }
+        QString names = QString::fromLatin1(c->name());
+        foreach(QByteArray alias, c->aliases()) {
+            names += QLatin1String(" / ") + QString::fromLatin1(alias);
+        }
+        if (doc->codec() == c)
+            currentIndex = encodings.count();
+        encodings << names;
+    }
+    m_listWidget->addItems(encodings);
+    if (currentIndex >= 0)
+        m_listWidget->setCurrentRow(currentIndex);
+
+    connect(m_listWidget, SIGNAL(itemSelectionChanged()), this, SLOT(updateButtons()));
+
+    m_dialogButtonBox = new QDialogButtonBox(this);
+    m_reloadButton = m_dialogButtonBox->addButton(tr("Reload with Encoding"), QDialogButtonBox::DestructiveRole);
+    m_saveButton =  m_dialogButtonBox->addButton(tr("Save with Encoding"), QDialogButtonBox::DestructiveRole);
+    m_dialogButtonBox->addButton(QDialogButtonBox::Cancel);
+    connect(m_dialogButtonBox, SIGNAL(clicked(QAbstractButton*)), this, SLOT(buttonClicked(QAbstractButton*)));
+
+    QVBoxLayout *vbox = new QVBoxLayout(this);
+    vbox->addWidget(m_label);
+    vbox->addWidget(m_listWidget);
+    vbox->addWidget(m_dialogButtonBox);
+
+    updateButtons();
+}
+
+
+
+CodecSelector::~CodecSelector()
+{
+}
+
+void CodecSelector::updateButtons()
+{
+    bool hasCodec = (selectedCodec() != 0);
+    m_reloadButton->setEnabled(!m_isModified && hasCodec);
+    m_saveButton->setEnabled(!m_hasDecodingError && hasCodec);
+}
+
+QTextCodec *CodecSelector::selectedCodec() const
+{
+    if (QListWidgetItem *item = m_listWidget->currentItem()) {
+        if (!item->isSelected())
+            return 0;
+        QString codecName = item->text();
+        if (codecName.contains(QLatin1String(" / ")))
+            codecName = codecName.left(codecName.indexOf(QLatin1String(" / ")));
+        return QTextCodec::codecForName(codecName.toLatin1());
+    }
+    return 0;
+}
+
+
+CodecSelector::Result CodecSelector::exec()
+{
+    return (Result) QDialog::exec();
+}
+
+
+void CodecSelector::buttonClicked(QAbstractButton *button)
+{
+    Result result =  Cancel;
+    if (button == m_reloadButton)
+        result = Reload;
+    if (button == m_saveButton)
+        result = Save;
+    done(result);
+}
+