TextEditor: Use more direct approach for fallback IEditor construction

There are still a few places where the EditorWidget is the primary
object, or several of them per "visible" IEditor (e.g. Diff).
Provide a means to streamline setup there, too.

Change-Id: I14cfbd68e555ebc539e707032a0e5bef563e0a36
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/diffeditor/diffeditor.cpp

@@ -83,7 +83,6 @@ public slots:
     void setDisplaySettings(const DisplaySettings &ds);
 
 protected:
-    BaseTextEditor *createEditor() { return new BaseTextEditor; }
     void mouseMoveEvent(QMouseEvent *e);
     void mouseReleaseEvent(QMouseEvent *e);
 
@@ -98,7 +97,8 @@ private:
 DescriptionEditorWidget::DescriptionEditorWidget(QWidget *parent)
     : BaseTextEditorWidget(parent)
 {
-    setSimpleTextDocument("DiffEditor.DescriptionEditor");
+    setupFallBackEditor("DiffEditor.DescriptionEditor");
+
     DisplaySettings settings = displaySettings();
     settings.m_textWrapping = false;
     settings.m_displayLineNumbers = false;

src/plugins/diffeditor/diffeditorplugin.h

@@ -35,7 +35,6 @@
 #include <extensionsystem/iplugin.h>
 
 namespace DiffEditor {
-
 namespace Internal {
 
 class DiffEditorPlugin : public ExtensionSystem::IPlugin

src/plugins/diffeditor/selectabletexteditorwidget.cpp

@@ -38,8 +38,8 @@ namespace DiffEditor {
 SelectableTextEditorWidget::SelectableTextEditorWidget(QWidget *parent)
     : BaseTextEditorWidget(parent)
 {
-    setSimpleTextDocument("DiffEditor.UnifiedDiffEditor");
     setFrameStyle(QFrame::NoFrame);
+    setupFallBackEditor("DiffEditor.UnifiedDiffEditor");
 }
 
 SelectableTextEditorWidget::~SelectableTextEditorWidget()

src/plugins/diffeditor/sidebysidediffeditorwidget.cpp

@@ -69,28 +69,10 @@
 
 using namespace Core;
 using namespace TextEditor;
+using namespace Utils;
 
 namespace DiffEditor {
 
-//////////////////////
-
-class SideDiffEditor : public BaseTextEditor
-{
-    Q_OBJECT
-public:
-    SideDiffEditor()
-    {
-        connect(this, SIGNAL(tooltipRequested(TextEditor::BaseTextEditor*,QPoint,int)),
-                this, SLOT(slotTooltipRequested(TextEditor::BaseTextEditor*,QPoint,int)));
-    }
-
-private slots:
-    void slotTooltipRequested(TextEditor::BaseTextEditor *editor,
-                              const QPoint &globalPoint,
-                              int position);
-
-};
-
 ////////////////////////
 /*
 class MultiHighlighter : public SyntaxHighlighter
@@ -168,7 +150,7 @@ protected:
         return SelectableTextEditorWidget::extraAreaWidth(markWidthPtr);
     }
     void applyFontSettings();
-    BaseTextEditor *createEditor() { return new SideDiffEditor; }
+
     virtual QString lineNumber(int blockNumber) const;
     virtual int lineNumberDigits() const;
     virtual bool selectionVisible(int blockNumber) const;
@@ -209,27 +191,6 @@ private:
 //    MultiHighlighter *m_highlighter;
 };
 
-////////////////////////
-
-void SideDiffEditor::slotTooltipRequested(TextEditor::BaseTextEditor *editor,
-                                          const QPoint &globalPoint,
-                                          int position)
-{
-    SideDiffEditorWidget *ew = qobject_cast<SideDiffEditorWidget *>(editorWidget());
-    if (!ew)
-        return;
-
-    QMap<int, DiffFileInfo> fi = ew->fileInfo();
-    QMap<int, DiffFileInfo>::const_iterator it
-            = fi.constFind(ew->document()->findBlock(position).blockNumber());
-    if (it != fi.constEnd()) {
-        Utils::ToolTip::show(globalPoint, Utils::TextContent(it.value().fileName),
-                                         editor->widget());
-    } else {
-        Utils::ToolTip::hide();
-    }
-}
-
 ////////////////////////
 /*
 MultiHighlighter::MultiHighlighter(SideDiffEditorWidget *editor, QTextDocument *document)
@@ -324,7 +285,8 @@ SideDiffEditorWidget::SideDiffEditorWidget(QWidget *parent)
       m_lineNumberDigits(1),
       m_inPaintEvent(false)
 {
-    textDocument()->setId("DiffEditor.SideDiffEditor");
+    setupFallBackEditor("DiffEditor.SideDiffEditor");
+
     DisplaySettings settings = displaySettings();
     settings.m_textWrapping = false;
     settings.m_displayLineNumbers = true;
@@ -334,6 +296,16 @@ SideDiffEditorWidget::SideDiffEditorWidget(QWidget *parent)
     settings.m_highlightBlocks = false;
     SelectableTextEditorWidget::setDisplaySettings(settings);
 
+    BaseTextEditor *editor = this->editor();
+    connect(editor, &BaseTextEditor::tooltipRequested, [this](BaseTextEditor *, const QPoint &point, int position) {
+        int block = textDocument()->document()->findBlock(position).blockNumber();
+        auto it = m_fileInfo.constFind(block);
+        if (it != m_fileInfo.constEnd())
+            ToolTip::show(point, TextContent(it.value().fileName), this);
+        else
+            ToolTip::hide();
+    });
+
 //    setCodeFoldingSupported(true);
 
 //    m_highlighter = new MultiHighlighter(this, baseTextDocument()->document());

src/plugins/diffeditor/unifieddiffeditorwidget.cpp

@@ -81,6 +81,8 @@ UnifiedDiffEditorWidget::UnifiedDiffEditorWidget(QWidget *parent)
     , m_leftLineNumberDigits(1)
     , m_rightLineNumberDigits(1)
 {
+    setupFallBackEditor(Id());
+
     DisplaySettings settings = displaySettings();
     settings.m_textWrapping = false;
     settings.m_displayLineNumbers = true;
@@ -376,11 +378,6 @@ void UnifiedDiffEditorWidget::patch(int diffFileIndex, int chunkIndex, bool reve
         m_controller->requestReload();
 }
 
-TextEditor::BaseTextEditor *UnifiedDiffEditorWidget::createEditor()
-{
-    return new BaseTextEditor;
-}
-
 void UnifiedDiffEditorWidget::clear(const QString &message)
 {
     m_leftLineNumberDigits = 1;

src/plugins/diffeditor/unifieddiffeditorwidget.h

@@ -68,7 +68,6 @@ public slots:
 protected:
     void mouseDoubleClickEvent(QMouseEvent *e);
     void contextMenuEvent(QContextMenuEvent *e);
-    TextEditor::BaseTextEditor *createEditor();
     QString lineNumber(int blockNumber) const;
     int lineNumberDigits() const;