Add DiffEditorController

Change-Id: Ic2f4a38d2ed08426ca7e5229d959b10fa545c129
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

13 files changed, 436 insertions, 141 deletions

diff --git a/src/plugins/diffeditor/diffeditor.cpp b/src/plugins/diffeditor/diffeditor.cpp
index d8a9113935..cbffc01116 100644
--- a/src/plugins/diffeditor/diffeditor.cpp
+++ b/src/plugins/diffeditor/diffeditor.cpp
@@ -49,15 +49,19 @@ namespace DiffEditor {
 ///////////////////////////////// DiffEditor //////////////////////////////////
 
 DiffEditor::DiffEditor(DiffEditorWidget *editorWidget)
-    : IEditor(0),
-      m_toolWidget(0),
-      m_file(new Internal::DiffEditorFile(QLatin1String(Constants::DIFF_EDITOR_MIMETYPE), this)),
-      m_editorWidget(editorWidget),
-      m_entriesComboBox(0)
+    : IEditor(0)
+    , m_toolWidget(0)
+    , m_file(new Internal::DiffEditorFile(QLatin1String(Constants::DIFF_EDITOR_MIMETYPE), this))
+    , m_editorWidget(editorWidget)
+    , m_diffEditorController(0)
+    , m_entriesComboBox(0)
 {
     setWidget(editorWidget);
-    connect(m_editorWidget, SIGNAL(navigatedToDiffFile(int)),
-            this, SLOT(activateEntry(int)));
+    m_diffEditorController = editorWidget ? editorWidget->diffEditorController() : 0;
+    if (m_diffEditorController) {
+        connect(m_diffEditorController, SIGNAL(currentDiffFileIndexChanged(int)),
+                this, SLOT(activateEntry(int)));
+    }
 }
 
 DiffEditor::~DiffEditor()
@@ -123,8 +127,6 @@ QWidget *DiffEditor::toolBar()
     whitespaceButton->setText(tr("Ignore Whitespace"));
     whitespaceButton->setCheckable(true);
     whitespaceButton->setChecked(true);
-    connect(whitespaceButton, SIGNAL(clicked(bool)),
-            m_editorWidget, SLOT(setIgnoreWhitespaces(bool)));
     m_toolWidget->addWidget(whitespaceButton);
 
     QLabel *contextLabel = new QLabel(m_toolWidget);
@@ -137,8 +139,6 @@ QWidget *DiffEditor::toolBar()
     contextSpinBox->setValue(3);
     contextSpinBox->setFrame(false);
     contextSpinBox->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding); // Mac Qt5
-    connect(contextSpinBox, SIGNAL(valueChanged(int)),
-            m_editorWidget, SLOT(setContextLinesNumber(int)));
     m_toolWidget->addWidget(contextSpinBox);
 
     QToolButton *toggleSync = new QToolButton(m_toolWidget);
@@ -146,21 +146,29 @@ QWidget *DiffEditor::toolBar()
     toggleSync->setCheckable(true);
     toggleSync->setChecked(true);
     toggleSync->setToolTip(tr("Synchronize Horizontal Scroll Bars"));
-    connect(toggleSync, SIGNAL(clicked(bool)),
-            m_editorWidget, SLOT(setHorizontalScrollBarSynchronization(bool)));
     m_toolWidget->addWidget(toggleSync);
 
+    if (m_diffEditorController) {
+        connect(whitespaceButton, SIGNAL(clicked(bool)),
+                m_diffEditorController, SLOT(setIgnoreWhitespaces(bool)));
+        connect(contextSpinBox, SIGNAL(valueChanged(int)),
+                m_diffEditorController, SLOT(setContextLinesNumber(int)));
+        connect(toggleSync, SIGNAL(clicked(bool)),
+                m_diffEditorController, SLOT(setHorizontalScrollBarSynchronization(bool)));
+        // TODO: synchronize in opposite direction too
+    }
+
     return m_toolWidget;
 }
 
-void DiffEditor::setDiff(const QList<DiffEditorWidget::DiffFilesContents> &diffFileList,
+void DiffEditor::setDiff(const QList<DiffEditorController::DiffFilesContents> &diffFileList,
                                  const QString &workingDirectory)
 {
     m_entriesComboBox->clear();
     const int count = diffFileList.count();
     for (int i = 0; i < count; i++) {
-        const DiffEditorWidget::DiffFileInfo leftEntry = diffFileList.at(i).leftFileInfo;
-        const DiffEditorWidget::DiffFileInfo rightEntry = diffFileList.at(i).rightFileInfo;
+        const DiffEditorController::DiffFileInfo leftEntry = diffFileList.at(i).leftFileInfo;
+        const DiffEditorController::DiffFileInfo rightEntry = diffFileList.at(i).rightFileInfo;
         const QString leftShortFileName = QFileInfo(leftEntry.fileName).fileName();
         const QString rightShortFileName = QFileInfo(rightEntry.fileName).fileName();
         QString itemText;
@@ -194,14 +202,16 @@ void DiffEditor::setDiff(const QList<DiffEditorWidget::DiffFilesContents> &diffF
         m_entriesComboBox->setItemData(m_entriesComboBox->count() - 1, itemToolTip, Qt::ToolTipRole);
     }
     updateEntryToolTip();
-    m_editorWidget->setDiff(diffFileList, workingDirectory);
+    if (m_diffEditorController)
+        m_diffEditorController->setDiffContents(diffFileList, workingDirectory);
 }
 
 void DiffEditor::clear(const QString &message)
 {
     m_entriesComboBox->clear();
     updateEntryToolTip();
-    m_editorWidget->clear(message);
+    if (m_diffEditorController)
+        m_diffEditorController->clear(message);
 }
 
 void DiffEditor::updateEntryToolTip()
@@ -214,7 +224,8 @@ void DiffEditor::updateEntryToolTip()
 void DiffEditor::entryActivated(int index)
 {
     updateEntryToolTip();
-    m_editorWidget->navigateToDiffFile(index);
+    if (m_diffEditorController)
+        m_diffEditorController->setCurrentDiffFileIndex(index);
 }
 
 void DiffEditor::activateEntry(int index)
diff --git a/src/plugins/diffeditor/diffeditor.h b/src/plugins/diffeditor/diffeditor.h
index daf0b07a67..1a89ceaa74 100644
--- a/src/plugins/diffeditor/diffeditor.h
+++ b/src/plugins/diffeditor/diffeditor.h
@@ -31,7 +31,7 @@
 #define DIFFEDITOR_H
 
 #include "diffeditor_global.h"
-#include "diffeditorwidget.h"
+#include "diffeditorcontroller.h"
 
 #include <coreplugin/editormanager/ieditor.h>
 #include <coreplugin/idocument.h>
@@ -42,6 +42,7 @@ class QComboBox;
 QT_END_NAMESPACE
 
 namespace DiffEditor {
+class DiffEditorWidget;
 
 namespace Internal {
 class DiffEditorFile;
@@ -55,7 +56,7 @@ public:
     virtual ~DiffEditor();
 
 public:
-    void setDiff(const QList<DiffEditorWidget::DiffFilesContents> &diffFileList,
+    void setDiff(const QList<DiffEditorController::DiffFilesContents> &diffFileList,
                  const QString &workingDirectory = QString());
     void clear(const QString &message);
 
@@ -81,6 +82,7 @@ private:
 
     Internal::DiffEditorFile *m_file;
     DiffEditorWidget *m_editorWidget;
+    DiffEditorController *m_diffEditorController;
     QComboBox *m_entriesComboBox;
 };
 
diff --git a/src/plugins/diffeditor/diffeditor.pro b/src/plugins/diffeditor/diffeditor.pro
index 2fd47ec939..770f62a1ad 100644
--- a/src/plugins/diffeditor/diffeditor.pro
+++ b/src/plugins/diffeditor/diffeditor.pro
@@ -2,8 +2,9 @@ DEFINES += DIFFEDITOR_LIBRARY
 include(../../qtcreatorplugin.pri)
 
 HEADERS += diffeditor_global.h \
-        diffeditorconstants.h \
         diffeditor.h \
+        diffeditorconstants.h \
+        diffeditorcontroller.h \
         diffeditorfactory.h \
         diffeditorfile.h \
         diffeditorplugin.h \
@@ -13,6 +14,7 @@ HEADERS += diffeditor_global.h \
         diffshoweditorfactory.h
 
 SOURCES += diffeditor.cpp \
+        diffeditorcontroller.cpp \
         diffeditorfactory.cpp \
         diffeditorfile.cpp \
         diffeditorplugin.cpp \
diff --git a/src/plugins/diffeditor/diffeditor.qbs b/src/plugins/diffeditor/diffeditor.qbs
index 622267fbb5..5e404331e8 100644
--- a/src/plugins/diffeditor/diffeditor.qbs
+++ b/src/plugins/diffeditor/diffeditor.qbs
@@ -15,6 +15,8 @@ QtcPlugin {
         "diffeditor.h",
         "diffeditor_global.h",
         "diffeditorconstants.h",
+        "diffeditorcontroller.cpp",
+        "diffeditorcontroller.h",
         "diffeditorfactory.cpp",
         "diffeditorfactory.h",
         "diffeditorfile.cpp",
diff --git a/src/plugins/diffeditor/diffeditorcontroller.cpp b/src/plugins/diffeditor/diffeditorcontroller.cpp
new file mode 100644
index 0000000000..5aa790e5a6
--- /dev/null
+++ b/src/plugins/diffeditor/diffeditorcontroller.cpp
@@ -0,0 +1,160 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** 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.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "diffeditorcontroller.h"
+
+namespace DiffEditor {
+
+DiffEditorController::DiffEditorController(QObject *parent)
+    : QObject(parent),
+      m_contextLinesNumber(3),
+      m_ignoreWhitespaces(true),
+      m_syncScrollBars(true)
+{
+    clear();
+}
+
+DiffEditorController::~DiffEditorController()
+{
+
+}
+
+QString DiffEditorController::clearMessage() const
+{
+    return m_clearMessage;
+}
+
+QList<DiffEditorController::DiffFilesContents> DiffEditorController::diffContents() const
+{
+    return m_diffFileList;
+}
+
+QString DiffEditorController::workingDirectory() const
+{
+    return m_workingDirectory;
+}
+
+int DiffEditorController::contextLinesNumber() const
+{
+    return m_contextLinesNumber;
+}
+
+bool DiffEditorController::isIgnoreWhitespaces() const
+{
+    return m_ignoreWhitespaces;
+}
+
+bool DiffEditorController::horizontalScrollBarSynchronization() const
+{
+    return m_syncScrollBars;
+}
+
+int DiffEditorController::currentDiffFileIndex() const
+{
+    return m_currentDiffFileIndex;
+}
+
+void DiffEditorController::clear()
+{
+    clear(tr("No difference"));
+}
+
+void DiffEditorController::clear(const QString &message)
+{
+    m_clearMessage = message;
+    m_currentDiffFileIndex = -1;
+    emit cleared(message);
+}
+
+void DiffEditorController::setDiffContents(const QList<DiffFilesContents> &diffFileList, const QString &workingDirectory)
+{
+    m_diffFileList = diffFileList;
+    m_workingDirectory = workingDirectory;
+    m_currentDiffFileIndex = (diffFileList.isEmpty() ? -1 : 0);
+    emit diffContentsChanged(diffFileList, workingDirectory);
+}
+
+void DiffEditorController::setContextLinesNumber(int lines)
+{
+    const int l = qMax(lines, -1);
+    if (m_contextLinesNumber == l)
+        return;
+
+    m_contextLinesNumber = l;
+    emit contextLinesNumberChanged(l);
+}
+
+void DiffEditorController::setIgnoreWhitespaces(bool ignore)
+{
+    if (m_ignoreWhitespaces == ignore)
+        return;
+
+    m_ignoreWhitespaces = ignore;
+    emit ignoreWhitespacesChanged(ignore);
+}
+
+void DiffEditorController::setHorizontalScrollBarSynchronization(bool on)
+{
+    if (m_syncScrollBars == on)
+        return;
+
+    m_syncScrollBars = on;
+    emit horizontalScrollBarSynchronizationChanged(on);
+}
+
+void DiffEditorController::setCurrentDiffFileIndex(int diffFileIndex)
+{
+    if (!m_diffFileList.count())
+        return; // -1 is the only valid value in this case
+
+    const int newIndex = qBound(0, diffFileIndex, m_diffFileList.count() - 1);
+
+    if (m_currentDiffFileIndex == newIndex)
+        return;
+
+    m_currentDiffFileIndex = newIndex;
+    emit currentDiffFileIndexChanged(newIndex);
+}
+
+} // namespace DiffEditor
+
+//QTextCodec *DiffEditorWidget::codec() const
+//{
+//}
+
+//QString DiffEditorWidget::source() const
+//{
+//    return m_source;
+//}
+
+//void DiffEditorWidget::setSource(const QString &source)
+//{
+//    m_source = source;
+//}
+
diff --git a/src/plugins/diffeditor/diffeditorcontroller.h b/src/plugins/diffeditor/diffeditorcontroller.h
new file mode 100644
index 0000000000..a03d54052f
--- /dev/null
+++ b/src/plugins/diffeditor/diffeditorcontroller.h
@@ -0,0 +1,114 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** 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.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef DIFFEDITORCONTROLLER_H
+#define DIFFEDITORCONTROLLER_H
+
+#include "diffeditor_global.h"
+
+#include <QObject>
+
+namespace DiffEditor {
+
+class DIFFEDITOR_EXPORT DiffEditorController : public QObject
+{
+//    Q_PROPERTY(QString source READ source WRITE setSource)
+    Q_OBJECT
+public:
+    class DiffFileInfo {
+    public:
+        DiffFileInfo() {}
+        DiffFileInfo(const QString &file) : fileName(file) {}
+        DiffFileInfo(const QString &file, const QString &type) : fileName(file), typeInfo(type) {}
+        QString fileName;
+        QString typeInfo;
+    };
+
+    class DiffFilesContents {
+    public:
+        DiffFileInfo leftFileInfo;
+        QString leftText;
+        DiffFileInfo rightFileInfo;
+        QString rightText;
+    };
+
+    DiffEditorController(QObject *parent = 0);
+    ~DiffEditorController();
+
+//    QTextCodec *codec() const;
+
+//    QString source() const;
+//    void setSource(const  QString &source);
+
+    QString clearMessage() const;
+
+    QList<DiffFilesContents> diffContents() const;
+    QString workingDirectory() const;
+
+    int contextLinesNumber() const;
+    bool isIgnoreWhitespaces() const;
+    bool horizontalScrollBarSynchronization() const;
+    int currentDiffFileIndex() const;
+
+public slots:
+    void clear();
+    void clear(const QString &message);
+    void setDiffContents(const QList<DiffEditorController::DiffFilesContents> &diffFileList, const QString &workingDirectory = QString());
+
+    void setContextLinesNumber(int lines);
+    void setIgnoreWhitespaces(bool ignore);
+    void setHorizontalScrollBarSynchronization(bool on);
+    void setCurrentDiffFileIndex(int diffFileIndex);
+
+signals:
+    // This sets the current diff file index to -1
+    void cleared(const QString message);
+    // This sets the current diff file index to 0 (unless diffFileList is empty)
+    void diffContentsChanged(const QList<DiffEditorController::DiffFilesContents> &diffFileList, const QString &workingDirectory);
+
+    void contextLinesNumberChanged(int lines);
+    void ignoreWhitespacesChanged(bool ignore);
+    void horizontalScrollBarSynchronizationChanged(bool on);
+    void currentDiffFileIndexChanged(int diffFileIndex);
+
+private:
+    QString m_clearMessage;
+
+    QList<DiffFilesContents> m_diffFileList;
+    QString m_workingDirectory;
+
+    int m_contextLinesNumber;
+    bool m_ignoreWhitespaces;
+    bool m_syncScrollBars;
+    int m_currentDiffFileIndex;
+};
+
+} // namespace DiffEditor
+
+#endif // DIFFEDITORCONTROLLER_H
diff --git a/src/plugins/diffeditor/diffeditorfactory.cpp b/src/plugins/diffeditor/diffeditorfactory.cpp
index 4cd2a1b11f..278377b024 100644
--- a/src/plugins/diffeditor/diffeditorfactory.cpp
+++ b/src/plugins/diffeditor/diffeditorfactory.cpp
@@ -49,6 +49,8 @@ DiffEditorFactory::DiffEditorFactory(QObject *parent)
 Core::IEditor *DiffEditorFactory::createEditor()
 {
     DiffEditorWidget *editorWidget = new DiffEditorWidget();
+    DiffEditorController *editorController = new DiffEditorController(editorWidget);
+    editorWidget->setDiffEditorController(editorController);
     DiffEditor *editor = new DiffEditor(editorWidget);
     return editor;
 }
diff --git a/src/plugins/diffeditor/diffeditorplugin.cpp b/src/plugins/diffeditor/diffeditorplugin.cpp
index 647c197fe0..17b0d632e5 100644
--- a/src/plugins/diffeditor/diffeditorplugin.cpp
+++ b/src/plugins/diffeditor/diffeditorplugin.cpp
@@ -114,12 +114,12 @@ void DiffEditorPlugin::diff()
     const QString text1 = getFileContents(fileName1, codec);
     const QString text2 = getFileContents(fileName2, codec);
 
-    DiffEditorWidget::DiffFilesContents dfc;
+    DiffEditorController::DiffFilesContents dfc;
     dfc.leftFileInfo = fileName1;
     dfc.leftText = text1;
     dfc.rightFileInfo = fileName2;
     dfc.rightText = text2;
-    QList<DiffEditorWidget::DiffFilesContents> list;
+    QList<DiffEditorController::DiffFilesContents> list;
     list.append(dfc);
 
     editor->setDiff(list);
diff --git a/src/plugins/diffeditor/diffeditorwidget.cpp b/src/plugins/diffeditor/diffeditorwidget.cpp
index 7162e58bb6..8561f9f8e1 100644
--- a/src/plugins/diffeditor/diffeditorwidget.cpp
+++ b/src/plugins/diffeditor/diffeditorwidget.cpp
@@ -64,7 +64,8 @@ using namespace TextEditor;
 
 namespace DiffEditor {
 
-struct TextLineData {
+class TextLineData {
+public:
     enum TextLineType {
         TextLine,
         Separator,
@@ -77,7 +78,8 @@ struct TextLineData {
     QString text;
 };
 
-struct RowData {
+class RowData {
+public:
     RowData() : equal(true) {}
     RowData(const TextLineData &l)
         : leftLine(l), rightLine(l), equal(true) {}
@@ -88,7 +90,8 @@ struct RowData {
     bool equal; // true if left and right lines are equal, taking whitespaces into account (or both invalid)
 };
 
-struct ChunkData {
+class ChunkData {
+public:
     ChunkData() : contextChunk(false) {}
     QList<RowData> rows;
     bool contextChunk;
@@ -96,12 +99,13 @@ struct ChunkData {
     QMap<int, int> changedRightPositions; // counting from the beginning of the chunk
 };
 
-struct FileData {
+class FileData {
+public:
     FileData() {}
     FileData(const ChunkData &chunkData) { chunks.append(chunkData); }
     QList<ChunkData> chunks;
-    DiffEditorWidget::DiffFileInfo leftFileInfo;
-    DiffEditorWidget::DiffFileInfo rightFileInfo;
+    DiffEditorController::DiffFileInfo leftFileInfo;
+    DiffEditorController::DiffFileInfo rightFileInfo;
 };
 
 //////////////////////
@@ -132,7 +136,7 @@ public:
     ~MultiHighlighter();
 
     virtual void setFontSettings(const TextEditor::FontSettings &fontSettings);
-    void setDocuments(const QList<QPair<DiffEditorWidget::DiffFileInfo, QString> > &documents);
+    void setDocuments(const QList<QPair<DiffEditorController::DiffFileInfo, QString> > &documents);
 
 protected:
     virtual void highlightBlock(const QString &text);
@@ -150,9 +154,9 @@ class DiffViewEditorWidget : public BaseTextEditorWidget
 {
     Q_OBJECT
 public:
-    struct ExtendedFileInfo
-    {
-        DiffEditorWidget::DiffFileInfo fileInfo;
+    class ExtendedFileInfo {
+    public:
+        DiffEditorController::DiffFileInfo fileInfo;
         TextEditor::SyntaxHighlighter *highlighter;
     };
 
@@ -164,21 +168,20 @@ public:
     }
 
     // block number, file info
-    QMap<int, DiffEditorWidget::DiffFileInfo> fileInfo() const { return m_fileInfo; }
+    QMap<int, DiffEditorController::DiffFileInfo> fileInfo() const { return m_fileInfo; }
 
     void setLineNumber(int blockNumber, int lineNumber);
-    void setFileInfo(int blockNumber, const DiffEditorWidget::DiffFileInfo &fileInfo);
+    void setFileInfo(int blockNumber, const DiffEditorController::DiffFileInfo &fileInfo);
     void setSkippedLines(int blockNumber, int skippedLines) { m_skippedLines[blockNumber] = skippedLines; setSeparator(blockNumber, true); }
     void setSeparator(int blockNumber, bool separator) { m_separators[blockNumber] = separator; }
     bool isFileLine(int blockNumber) const { return m_fileInfo.contains(blockNumber); }
     int blockNumberForFileIndex(int fileIndex) const;
     int fileIndexForBlockNumber(int blockNumber) const;
     bool isChunkLine(int blockNumber) const { return m_skippedLines.contains(blockNumber); }
-    void clearAll();
     void clearAll(const QString &message);
     void clearAllData();
     QTextBlock firstVisibleBlock() const { return BaseTextEditorWidget::firstVisibleBlock(); }
-    void setDocuments(const QList<QPair<DiffEditorWidget::DiffFileInfo, QString> > &documents);
+    void setDocuments(const QList<QPair<DiffEditorController::DiffFileInfo, QString> > &documents);
 
 public slots:
     void setDisplaySettings(const DisplaySettings &ds);
@@ -216,7 +219,7 @@ private:
     QMap<int, int> m_lineNumbers;
     int m_lineNumberDigits;
     // block number, fileInfo. Set for file lines only.
-    QMap<int, DiffEditorWidget::DiffFileInfo> m_fileInfo;
+    QMap<int, DiffEditorController::DiffFileInfo> m_fileInfo;
     // block number, skipped lines. Set for chunk lines only.
     QMap<int, int> m_skippedLines;
     // block number, separator. Set for file, chunk or span line.
@@ -243,7 +246,7 @@ MultiHighlighter::MultiHighlighter(DiffViewEditorWidget *editor, QTextDocument *
 
 MultiHighlighter::~MultiHighlighter()
 {
-    setDocuments(QList<QPair<DiffEditorWidget::DiffFileInfo, QString> >());
+    setDocuments(QList<QPair<DiffEditorController::DiffFileInfo, QString> >());
 }
 
 void MultiHighlighter::setFontSettings(const TextEditor::FontSettings &fontSettings)
@@ -256,7 +259,7 @@ void MultiHighlighter::setFontSettings(const TextEditor::FontSettings &fontSetti
     }
 }
 
-void MultiHighlighter::setDocuments(const QList<QPair<DiffEditorWidget::DiffFileInfo, QString> > &documents)
+void MultiHighlighter::setDocuments(const QList<QPair<DiffEditorController::DiffFileInfo, QString> > &documents)
 {
     // clear old documents
     qDeleteAll(m_documents);
@@ -266,7 +269,7 @@ void MultiHighlighter::setDocuments(const QList<QPair<DiffEditorWidget::DiffFile
 
     // create new documents
     for (int i = 0; i < documents.count(); i++) {
-        DiffEditorWidget::DiffFileInfo fileInfo = documents.at(i).first;
+        DiffEditorController::DiffFileInfo fileInfo = documents.at(i).first;
         const QString contents = documents.at(i).second;
         QTextDocument *document = new QTextDocument(contents);
         const MimeType mimeType = MimeDatabase::findByFile(QFileInfo(fileInfo.fileName));
@@ -316,8 +319,8 @@ void DiffViewEditorEditable::slotTooltipRequested(TextEditor::ITextEditor *edito
     if (!ew)
         return;
 
-    QMap<int, DiffEditorWidget::DiffFileInfo> fi = ew->fileInfo();
-    QMap<int, DiffEditorWidget::DiffFileInfo>::const_iterator it
+    QMap<int, DiffEditorController::DiffFileInfo> fi = ew->fileInfo();
+    QMap<int, DiffEditorController::DiffFileInfo>::const_iterator it
             = fi.constFind(ew->document()->findBlock(position).blockNumber());
     if (it != fi.constEnd()) {
         Utils::ToolTip::show(globalPoint, Utils::TextContent(it.value().fileName),
@@ -433,7 +436,7 @@ void DiffViewEditorWidget::setLineNumber(int blockNumber, int lineNumber)
     m_lineNumberDigits = qMax(m_lineNumberDigits, lineNumberString.count());
 }
 
-void DiffViewEditorWidget::setFileInfo(int blockNumber, const DiffEditorWidget::DiffFileInfo &fileInfo)
+void DiffViewEditorWidget::setFileInfo(int blockNumber, const DiffEditorController::DiffFileInfo &fileInfo)
 {
     m_fileInfo[blockNumber] = fileInfo;
     setSeparator(blockNumber, true);
@@ -444,7 +447,7 @@ int DiffViewEditorWidget::blockNumberForFileIndex(int fileIndex) const
     if (fileIndex < 0 || fileIndex >= m_fileInfo.count())
         return -1;
 
-    QMap<int, DiffEditorWidget::DiffFileInfo>::const_iterator it
+    QMap<int, DiffEditorController::DiffFileInfo>::const_iterator it
             = m_fileInfo.constBegin();
     for (int i = 0; i < fileIndex; i++)
         ++it;
@@ -454,9 +457,9 @@ int DiffViewEditorWidget::blockNumberForFileIndex(int fileIndex) const
 
 int DiffViewEditorWidget::fileIndexForBlockNumber(int blockNumber) const
 {
-    QMap<int, DiffEditorWidget::DiffFileInfo>::const_iterator it
+    QMap<int, DiffEditorController::DiffFileInfo>::const_iterator it
             = m_fileInfo.constBegin();
-    QMap<int, DiffEditorWidget::DiffFileInfo>::const_iterator itEnd
+    QMap<int, DiffEditorController::DiffFileInfo>::const_iterator itEnd
             = m_fileInfo.constEnd();
 
     int i = -1;
@@ -469,18 +472,13 @@ int DiffViewEditorWidget::fileIndexForBlockNumber(int blockNumber) const
     return i;
 }
 
-void DiffViewEditorWidget::clearAll()
-{
-    clearAll(tr("No difference"));
-}
-
 void DiffViewEditorWidget::clearAll(const QString &message)
 {
     setBlockSelection(false);
     clear();
     clearAllData();
     setPlainText(message);
-    m_highlighter->setDocuments(QList<QPair<DiffEditorWidget::DiffFileInfo, QString> >());
+    m_highlighter->setDocuments(QList<QPair<DiffEditorController::DiffFileInfo, QString> >());
 }
 
 void DiffViewEditorWidget::clearAllData()
@@ -492,7 +490,7 @@ void DiffViewEditorWidget::clearAllData()
     m_separators.clear();
 }
 
-void  DiffViewEditorWidget::setDocuments(const QList<QPair<DiffEditorWidget::DiffFileInfo, QString> > &documents)
+void  DiffViewEditorWidget::setDocuments(const QList<QPair<DiffEditorController::DiffFileInfo, QString> > &documents)
 {
     m_highlighter->setDocuments(documents);
 }
@@ -597,7 +595,7 @@ void DiffViewEditorWidget::paintEvent(QPaintEvent *e)
                                    skippedRowsText, currentBlock, top);
                 }
 
-                const DiffEditorWidget::DiffFileInfo fileInfo = m_fileInfo.value(blockNumber);
+                const DiffEditorController::DiffFileInfo fileInfo = m_fileInfo.value(blockNumber);
                 if (!fileInfo.fileName.isEmpty()) {
                     const QString fileNameText = fileInfo.typeInfo.isEmpty()
                             ? fileInfo.fileName
@@ -716,11 +714,9 @@ void DiffViewEditorWidget::drawCollapsedBlockPopup(QPainter &painter,
 //////////////////
 
 DiffEditorWidget::DiffEditorWidget(QWidget *parent)
-    : QWidget(parent),
-      m_contextLinesNumber(3),
-      m_ignoreWhitespaces(true),
-      m_syncScrollBars(true),
-      m_foldingBlocker(false)
+    : QWidget(parent)
+    , m_controller(0)
+    , m_foldingBlocker(false)
 {
     m_leftEditor = new DiffViewEditorWidget(this);
     m_leftEditor->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
@@ -785,7 +781,7 @@ DiffEditorWidget::DiffEditorWidget(QWidget *parent)
     l->setMargin(0);
     l->addWidget(m_splitter);
 
-    clear();
+    clear(tr("No controller"));
 }
 
 DiffEditorWidget::~DiffEditorWidget()
@@ -793,10 +789,40 @@ DiffEditorWidget::~DiffEditorWidget()
 
 }
 
-void DiffEditorWidget::clear()
+void DiffEditorWidget::setDiffEditorController(DiffEditorController *controller)
 {
-    m_leftEditor->clearAll();
-    m_rightEditor->clearAll();
+    if (m_controller) {
+        disconnect(m_controller, SIGNAL(cleared(QString)), this, SLOT(clear(QString)));
+        disconnect(m_controller, SIGNAL(diffContentsChanged(QList<DiffEditorController::DiffFilesContents>,QString)),
+                this, SLOT(setDiff(QList<DiffEditorController::DiffFilesContents>,QString)));
+        disconnect(m_controller, SIGNAL(contextLinesNumberChanged(int)),
+                this, SLOT(setContextLinesNumber(int)));
+        disconnect(m_controller, SIGNAL(ignoreWhitespacesChanged(bool)),
+                this, SLOT(setIgnoreWhitespaces(bool)));
+        disconnect(m_controller, SIGNAL(currentDiffFileIndexChanged(int)),
+                this, SLOT(setCurrentDiffFileIndex(int)));
+
+        clear(tr("No controller"));
+    }
+    m_controller = controller;
+    if (m_controller) {
+        connect(m_controller, SIGNAL(cleared(QString)), this, SLOT(clear(QString)));
+        connect(m_controller, SIGNAL(diffContentsChanged(QList<DiffEditorController::DiffFilesContents>,QString)),
+                this, SLOT(setDiff(QList<DiffEditorController::DiffFilesContents>,QString)));
+        connect(m_controller, SIGNAL(contextLinesNumberChanged(int)),
+                this, SLOT(setContextLinesNumber(int)));
+        connect(m_controller, SIGNAL(ignoreWhitespacesChanged(bool)),
+                this, SLOT(setIgnoreWhitespaces(bool)));
+        connect(m_controller, SIGNAL(currentDiffFileIndexChanged(int)),
+                this, SLOT(setCurrentDiffFileIndex(int)));
+
+        setDiff(m_controller->diffContents(), m_controller->workingDirectory());
+    }
+}
+
+DiffEditorController *DiffEditorWidget::diffEditorController() const
+{
+    return m_controller;
 }
 
 void DiffEditorWidget::clear(const QString &message)
@@ -805,13 +831,14 @@ void DiffEditorWidget::clear(const QString &message)
     m_rightEditor->clearAll(message);
 }
 
-void DiffEditorWidget::setDiff(const QList<DiffFilesContents> &diffFileList, const QString &workingDirectory)
+void DiffEditorWidget::setDiff(const QList<DiffEditorController::DiffFilesContents> &diffFileList, const QString &workingDirectory)
 {
-    m_workingDirectory = workingDirectory;
+    Q_UNUSED(workingDirectory)
+
     Differ differ;
     QList<DiffList> diffList;
     for (int i = 0; i < diffFileList.count(); i++) {
-        DiffFilesContents dfc = diffFileList.at(i);
+        DiffEditorController::DiffFilesContents dfc = diffFileList.at(i);
         DiffList dl;
         dl.leftFileInfo = dfc.leftFileInfo;
         dl.rightFileInfo = dfc.rightFileInfo;
@@ -841,10 +868,8 @@ void DiffEditorWidget::setDiff(const QList<DiffList> &diffList)
 
 void DiffEditorWidget::setContextLinesNumber(int lines)
 {
-    if (m_contextLinesNumber == lines)
-        return;
+    Q_UNUSED(lines)
 
-    m_contextLinesNumber = lines;
     for (int i = 0; i < m_diffList.count(); i++) {
         const FileData oldFileData = m_contextFileData.at(i);
         FileData newFileData = calculateContextData(m_originalChunkData.at(i));
@@ -858,14 +883,12 @@ void DiffEditorWidget::setContextLinesNumber(int lines)
 
 void DiffEditorWidget::setIgnoreWhitespaces(bool ignore)
 {
-    if (m_ignoreWhitespaces == ignore)
-        return;
+    Q_UNUSED(ignore)
 
-    m_ignoreWhitespaces = ignore;
     setDiff(m_diffList);
 }
 
-void DiffEditorWidget::navigateToDiffFile(int diffFileIndex)
+void DiffEditorWidget::setCurrentDiffFileIndex(int diffFileIndex)
 {
     const int blockNumber = m_leftEditor->blockNumberForFileIndex(diffFileIndex);
 
@@ -888,16 +911,6 @@ QTextCodec *DiffEditorWidget::codec() const
     return const_cast<QTextCodec *>(m_leftEditor->codec());
 }
 
-BaseTextEditorWidget *DiffEditorWidget::leftEditor() const
-{
-    return m_leftEditor;
-}
-
-BaseTextEditorWidget *DiffEditorWidget::rightEditor() const
-{
-    return m_rightEditor;
-}
-
 bool DiffEditorWidget::isWhitespace(const QChar &c) const
 {
     if (c == QLatin1Char(' ') || c == QLatin1Char('\t'))
@@ -926,7 +939,7 @@ bool DiffEditorWidget::isEqual(const QList<Diff> &diffList, int diffNumber) cons
     if (diff.text.count() == 0)
         return true;
 
-    if (!m_ignoreWhitespaces)
+    if (m_controller && !m_controller->isIgnoreWhitespaces())
         return false;
 
     if (isWhitespace(diff) == false)
@@ -1177,7 +1190,8 @@ ChunkData DiffEditorWidget::calculateOriginalData(const QList<Diff> &diffList) c
 
 FileData DiffEditorWidget::calculateContextData(const ChunkData &originalData) const
 {
-    if (m_contextLinesNumber < 0)
+    const int contextLinesNumber = m_controller ? m_controller->contextLinesNumber() : 3;
+    if (contextLinesNumber < 0)
         return FileData(originalData);
 
     const int joinChunkThreshold = 1;
@@ -1199,8 +1213,8 @@ FileData DiffEditorWidget::calculateContextData(const ChunkData &originalData) c
             const bool first = equalRowStart == 0; // includes first line?
             const bool last = i == originalData.rows.count(); // includes last line?
 
-            const int firstLine = first ? 0 : equalRowStart + m_contextLinesNumber;
-            const int lastLine = last ? originalData.rows.count() : i - m_contextLinesNumber;
+            const int firstLine = first ? 0 : equalRowStart + contextLinesNumber;
+            const int lastLine = last ? originalData.rows.count() : i - contextLinesNumber;
 
             if (firstLine < lastLine - joinChunkThreshold) {
                 for (int j = firstLine; j < lastLine; j++) {
@@ -1280,9 +1294,9 @@ void DiffEditorWidget::showDiff()
     const int leftHorizontalValue = m_leftEditor->horizontalScrollBar()->value();
     const int rightHorizontalValue = m_rightEditor->horizontalScrollBar()->value();
 
-    clear();
+    clear(tr("No difference"));
 
-    QList<QPair<DiffEditorWidget::DiffFileInfo, QString> > leftDocs, rightDocs;
+    QList<QPair<DiffEditorController::DiffFileInfo, QString> > leftDocs, rightDocs;
     QString leftTexts, rightTexts;
     int blockNumber = 0;
     QChar separator = QLatin1Char('\n');
@@ -1629,7 +1643,10 @@ void DiffEditorWidget::slotRightJumpToOriginalFileRequested(int diffFileIndex,
 void DiffEditorWidget::jumpToOriginalFile(const QString &fileName,
                                           int lineNumber, int columnNumber)
 {
-    const QDir dir(m_workingDirectory);
+    if (!m_controller)
+        return;
+
+    const QDir dir(m_controller->workingDirectory());
     const QString absoluteFileName = dir.absoluteFilePath(fileName);
     Core::EditorManager::openEditorAt(absoluteFileName, lineNumber, columnNumber);
 }
@@ -1646,13 +1663,13 @@ void DiffEditorWidget::rightVSliderChanged()
 
 void DiffEditorWidget::leftHSliderChanged()
 {
-    if (m_syncScrollBars)
+    if (!m_controller || m_controller->horizontalScrollBarSynchronization())
         m_rightEditor->horizontalScrollBar()->setValue(m_leftEditor->horizontalScrollBar()->value());
 }
 
 void DiffEditorWidget::rightHSliderChanged()
 {
-    if (m_syncScrollBars)
+    if (!m_controller || m_controller->horizontalScrollBarSynchronization())
         m_leftEditor->horizontalScrollBar()->setValue(m_rightEditor->horizontalScrollBar()->value());
 }
 
@@ -1660,14 +1677,22 @@ void DiffEditorWidget::leftCursorPositionChanged()
 {
     leftVSliderChanged();
     leftHSliderChanged();
-    emit navigatedToDiffFile(m_leftEditor->fileIndexForBlockNumber(m_leftEditor->textCursor().blockNumber()));
+
+    if (!m_controller)
+        return;
+
+    m_controller->setCurrentDiffFileIndex(m_leftEditor->fileIndexForBlockNumber(m_leftEditor->textCursor().blockNumber()));
 }
 
 void DiffEditorWidget::rightCursorPositionChanged()
 {
     rightVSliderChanged();
     rightHSliderChanged();
-    emit navigatedToDiffFile(m_rightEditor->fileIndexForBlockNumber(m_rightEditor->textCursor().blockNumber()));
+
+    if (!m_controller)
+        return;
+
+    m_controller->setCurrentDiffFileIndex(m_rightEditor->fileIndexForBlockNumber(m_rightEditor->textCursor().blockNumber()));
 }
 
 void DiffEditorWidget::leftDocumentSizeChanged()
@@ -1680,11 +1705,6 @@ void DiffEditorWidget::rightDocumentSizeChanged()
     synchronizeFoldings(m_rightEditor, m_leftEditor);
 }
 
-void DiffEditorWidget::setHorizontalScrollBarSynchronization(bool on)
-{
-    m_syncScrollBars = on;
-}
-
 /* Special version of that method (original: TextEditor::BaseTextDocumentLayout::doFoldOrUnfold())
    The hack lies in fact, that when unfolding all direct sub-blocks are made visible,
    while some of them need to stay invisible (i.e. unfolded chunk lines)
diff --git a/src/plugins/diffeditor/diffeditorwidget.h b/src/plugins/diffeditor/diffeditorwidget.h
index 97c131dccb..8fde0bd5c6 100644
--- a/src/plugins/diffeditor/diffeditorwidget.h
+++ b/src/plugins/diffeditor/diffeditorwidget.h
@@ -32,6 +32,7 @@
 
 #include "diffeditor_global.h"
 #include "differ.h"
+#include "diffeditorcontroller.h"
 
 #include <QTextEdit>
 
@@ -60,47 +61,26 @@ class DIFFEDITOR_EXPORT DiffEditorWidget : public QWidget
 {
     Q_OBJECT
 public:
-    struct DiffFileInfo {
-        DiffFileInfo() {}
-        DiffFileInfo(const QString &file) : fileName(file) {}
-        DiffFileInfo(const QString &file, const QString &type) : fileName(file), typeInfo(type) {}
-        QString fileName;
-        QString typeInfo;
-    };
-
-    struct DiffFilesContents {
-        DiffFileInfo leftFileInfo;
-        QString leftText;
-        DiffFileInfo rightFileInfo;
-        QString rightText;
-    };
-
     DiffEditorWidget(QWidget *parent = 0);
     ~DiffEditorWidget();
 
-    void clear();
-    void clear(const QString &message);
-    void setDiff(const QList<DiffFilesContents> &diffFileList, const QString &workingDirectory = QString());
+    void setDiffEditorController(DiffEditorController *controller);
+    DiffEditorController *diffEditorController() const;
+
     QTextCodec *codec() const;
 
 #ifdef WITH_TESTS
     void testAssemblyRows();
 #endif // WITH_TESTS
 
-public slots:
+private slots:
+    void clear(const QString &message = QString());
+    void setDiff(const QList<DiffEditorController::DiffFilesContents> &diffFileList, const QString &workingDirectory);
+
     void setContextLinesNumber(int lines);
     void setIgnoreWhitespaces(bool ignore);
-    void setHorizontalScrollBarSynchronization(bool on);
-    void navigateToDiffFile(int diffFileIndex);
-
-signals:
-    void navigatedToDiffFile(int diffFileIndex);
+    void setCurrentDiffFileIndex(int diffFileIndex);
 
-protected:
-    TextEditor::BaseTextEditorWidget *leftEditor() const;
-    TextEditor::BaseTextEditorWidget *rightEditor() const;
-
-private slots:
     void setFontSettings(const TextEditor::FontSettings &fontSettings);
     void slotLeftJumpToOriginalFileRequested(int diffFileIndex, int lineNumber, int columnNumber);
     void slotRightJumpToOriginalFileRequested(int diffFileIndex, int lineNumber, int columnNumber);
@@ -114,9 +94,10 @@ private slots:
     void rightDocumentSizeChanged();
 
 private:
-    struct DiffList {
-        DiffFileInfo leftFileInfo;
-        DiffFileInfo rightFileInfo;
+    class DiffList {
+    public:
+        DiffEditorController::DiffFileInfo leftFileInfo;
+        DiffEditorController::DiffFileInfo rightFileInfo;
         QList<Diff> diffList;
     };
 
@@ -138,6 +119,7 @@ private:
     void synchronizeFoldings(DiffViewEditorWidget *source, DiffViewEditorWidget *destination);
     void jumpToOriginalFile(const QString &fileName, int lineNumber, int columnNumber);
 
+    DiffEditorController *m_controller;
     DiffViewEditorWidget *m_leftEditor;
     DiffViewEditorWidget *m_rightEditor;
     QSplitter *m_splitter;
@@ -145,10 +127,6 @@ private:
     QList<DiffList> m_diffList; // list of original outputs from differ
     QList<ChunkData> m_originalChunkData; // one big chunk for every file, ignoreWhitespaces taken into account
     QList<FileData> m_contextFileData; // ultimate data to be shown, contextLinesNumber taken into account
-    QString m_workingDirectory;
-    int m_contextLinesNumber;
-    bool m_ignoreWhitespaces;
-    bool m_syncScrollBars;
 
     bool m_foldingBlocker;
     QString m_source;
diff --git a/src/plugins/diffeditor/diffshoweditor.cpp b/src/plugins/diffeditor/diffshoweditor.cpp
index b8d732d0cb..520862c881 100644
--- a/src/plugins/diffeditor/diffshoweditor.cpp
+++ b/src/plugins/diffeditor/diffshoweditor.cpp
@@ -29,6 +29,7 @@
 
 #include "diffshoweditor.h"
 #include "diffeditorconstants.h"
+#include "diffeditorwidget.h"
 
 #include <QToolBar>
 #include <QToolButton>
diff --git a/src/plugins/diffeditor/diffshoweditor.h b/src/plugins/diffeditor/diffshoweditor.h
index 0cd05191b3..78bc185160 100644
--- a/src/plugins/diffeditor/diffshoweditor.h
+++ b/src/plugins/diffeditor/diffshoweditor.h
@@ -40,6 +40,8 @@ QT_BEGIN_NAMESPACE
 class QToolButton;
 QT_END_NAMESPACE
 
+namespace TextEditor { class BaseTextEditorWidget; }
+
 namespace DiffEditor {
 
 class DIFFEDITOR_EXPORT DiffShowEditor : public DiffEditor
diff --git a/src/plugins/git/gitclient.cpp b/src/plugins/git/gitclient.cpp
index 9bb2f86678..8e916982bc 100644
--- a/src/plugins/git/gitclient.cpp
+++ b/src/plugins/git/gitclient.cpp
@@ -60,6 +60,7 @@
 #include <vcsbase/vcsbaseplugin.h>
 
 #include <diffeditor/diffeditor.h>
+#include <diffeditor/diffeditorwidget.h>
 #include <diffeditor/diffshoweditor.h>
 #include <diffeditor/diffeditorconstants.h>
 
@@ -512,7 +513,7 @@ void GitDiffHandler::slotFileContentsReceived(const QString &contents)
 
 void GitDiffHandler::feedEditor()
 {
-    QList<DiffEditor::DiffEditorWidget::DiffFilesContents> list;
+    QList<DiffEditor::DiffEditorController::DiffFilesContents> list;
 
     QMap<QString, QList<RevisionRange> >::const_iterator itFile
             = m_requestedRevisionRanges.constBegin();
@@ -525,10 +526,10 @@ void GitDiffHandler::feedEditor()
             const Revision leftRevision = ranges.at(i).begin;
             const Revision rightRevision = ranges.at(i).end;
 
-            DiffEditor::DiffEditorWidget::DiffFilesContents dfc;
-            dfc.leftFileInfo = DiffEditor::DiffEditorWidget::DiffFileInfo(fileName, leftRevision.infoText());
+            DiffEditor::DiffEditorController::DiffFilesContents dfc;
+            dfc.leftFileInfo = DiffEditor::DiffEditorController::DiffFileInfo(fileName, leftRevision.infoText());
             dfc.leftText = m_collectedRevisions[fileName][leftRevision];
-            dfc.rightFileInfo = DiffEditor::DiffEditorWidget::DiffFileInfo(fileName, rightRevision.infoText());
+            dfc.rightFileInfo = DiffEditor::DiffEditorController::DiffFileInfo(fileName, rightRevision.infoText());
             dfc.rightText = m_collectedRevisions[fileName][rightRevision];
             list.append(dfc);
         }