Editor: add specialized snippet overlay

Split out the snippet functionality into a new derived
overlay implementation.

Change-Id: I2d7fffabe16ce6348ed067eb52ff221420a23285
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/texteditor/texteditor.cpp

@@ -665,7 +665,7 @@ public:
     int extraAreaPreviousMarkTooltipRequestedLine = -1;
 
     TextEditorOverlay *m_overlay = nullptr;
-    TextEditorOverlay *m_snippetOverlay = nullptr;
+    SnippetOverlay *m_snippetOverlay = nullptr;
     TextEditorOverlay *m_searchResultOverlay = nullptr;
     bool snippetCheckCursor(const QTextCursor &cursor);
     void snippetTabOrBacktab(bool forward);
@@ -1004,7 +1004,7 @@ void TextEditorWidgetPrivate::ctor(const QSharedPointer<TextDocument> &doc)
     q->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 
     m_overlay = new TextEditorOverlay(q);
-    m_snippetOverlay = new TextEditorOverlay(q);
+    m_snippetOverlay = new SnippetOverlay(q);
     m_searchResultOverlay = new TextEditorOverlay(q);
     m_refactorOverlay = new RefactorOverlay(q);
 

src/plugins/texteditor/texteditoroverlay.cpp

@@ -72,8 +72,6 @@ void TextEditorOverlay::clear()
         return;
     m_selections.clear();
     m_firstSelectionOriginalBegin = -1;
-    m_equivalentSelections.clear();
-    m_manglers.clear();
     update();
 }
 
@@ -481,13 +479,27 @@ QTextCursor TextEditorOverlay::assembleCursorForSelection(int selectionIndex) co
     return cursor;
 }
 
-void TextEditorOverlay::mapEquivalentSelections()
+bool TextEditorOverlay::hasFirstSelectionBeginMoved() const
+{
+    if (m_firstSelectionOriginalBegin == -1 || m_selections.isEmpty())
+        return false;
+    return m_selections.at(0).m_cursor_begin.position() != m_firstSelectionOriginalBegin;
+}
+
+void SnippetOverlay::clear()
+{
+    TextEditorOverlay::clear();
+    m_equivalentSelections.clear();
+    m_manglers.clear();
+}
+
+void SnippetOverlay::mapEquivalentSelections()
 {
     m_equivalentSelections.clear();
-    m_equivalentSelections.resize(m_selections.size());
+    m_equivalentSelections.resize(selections().size());
 
     QMultiMap<QString, int> all;
-    for (int i = 0; i < m_selections.size(); ++i)
+    for (int i = 0; i < selections().size(); ++i)
         all.insert(selectionText(i).toLower(), i);
 
     const QList<QString> &uniqueKeys = all.uniqueKeys();
@@ -506,7 +518,7 @@ void TextEditorOverlay::mapEquivalentSelections()
     }
 }
 
-void TextEditorOverlay::updateEquivalentSelections(const QTextCursor &cursor)
+void SnippetOverlay::updateEquivalentSelections(const QTextCursor &cursor)
 {
     int selectionIndex = selectionIndexForCursor(cursor);
     if (selectionIndex == -1)
@@ -528,12 +540,12 @@ void TextEditorOverlay::updateEquivalentSelections(const QTextCursor &cursor)
     }
 }
 
-void TextEditorOverlay::setNameMangler(const QList<NameMangler *> &manglers)
+void SnippetOverlay::setNameMangler(const QList<NameMangler *> &manglers)
 {
     m_manglers = manglers;
 }
 
-void TextEditorOverlay::mangle()
+void SnippetOverlay::mangle()
 {
     for (int i = 0; i < m_manglers.count(); ++i) {
         if (!m_manglers.at(i))
@@ -550,10 +562,3 @@ void TextEditorOverlay::mangle()
         }
     }
 }
-
-bool TextEditorOverlay::hasFirstSelectionBeginMoved() const
-{
-    if (m_firstSelectionOriginalBegin == -1 || m_selections.isEmpty())
-        return false;
-    return m_selections.at(0).m_cursor_begin.position() != m_firstSelectionOriginalBegin;
-}

src/plugins/texteditor/texteditoroverlay.h

@@ -74,7 +74,7 @@ public:
 
     void setAlpha(bool enabled) { m_alpha = enabled; }
 
-    void clear();
+    virtual void clear();
 
     enum OverlaySelectionFlags {
         LockSize = 1,
@@ -95,20 +95,17 @@ public:
 
     bool hasCursorInSelection(const QTextCursor &cursor) const;
 
-    void mapEquivalentSelections();
-    void updateEquivalentSelections(const QTextCursor &cursor);
-    void setNameMangler(const QList<NameMangler *> &manglers);
-    void mangle();
-
     bool hasFirstSelectionBeginMoved() const;
 
+protected:
+    int selectionIndexForCursor(const QTextCursor &cursor) const;
+    QString selectionText(int selectionIndex) const;
+    QTextCursor assembleCursorForSelection(int selectionIndex) const;
+
 private:
     QPainterPath createSelectionPath(const QTextCursor &begin, const QTextCursor &end, const QRect& clip);
     void paintSelection(QPainter *painter, const OverlaySelection &selection);
     void fillSelection(QPainter *painter, const OverlaySelection &selection, const QColor &color);
-    int selectionIndexForCursor(const QTextCursor &cursor) const;
-    QString selectionText(int selectionIndex) const;
-    QTextCursor assembleCursorForSelection(int selectionIndex) const;
 
     bool m_visible;
     bool m_alpha;
@@ -118,6 +115,21 @@ private:
     TextEditorWidget *m_editor;
     QWidget *m_viewport;
     QList<OverlaySelection> m_selections;
+};
+
+class SnippetOverlay : public TextEditorOverlay
+{
+public:
+    using TextEditorOverlay::TextEditorOverlay;
+
+    void clear() override;
+
+    void mapEquivalentSelections();
+    void updateEquivalentSelections(const QTextCursor &cursor);
+    void setNameMangler(const QList<NameMangler *> &manglers);
+    void mangle();
+
+private:
     QVector<QList<int> > m_equivalentSelections;
     QList<NameMangler *> m_manglers;
 };