Double-click to select current block

This is a Eclipse-like feature, for select enclosing element.
e.g.
int test() {| // Here is the cursor position
    ...
}
When Double-click, we can select the block: {...}
I think this is a useful feature.

Change-Id: I4ca7ed04056176195d1622714effda9079ae0e44
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>

src/plugins/texteditor/basetextdocumentlayout.cpp

@@ -201,7 +201,7 @@ TextBlockUserData::MatchType TextBlockUserData::checkClosedParenthesis(QTextCurs
     }
 }
 
-bool TextBlockUserData::findPreviousOpenParenthesis(QTextCursor *cursor, bool select)
+bool TextBlockUserData::findPreviousOpenParenthesis(QTextCursor *cursor, bool select, bool onlyInCurrentBlock)
 {
     QTextBlock block = cursor->block();
     int position = cursor->position();
@@ -224,6 +224,8 @@ bool TextBlockUserData::findPreviousOpenParenthesis(QTextCursor *cursor, bool se
                 }
             }
         }
+        if (onlyInCurrentBlock)
+            return false;
         block = block.previous();
     }
     return false;

src/plugins/texteditor/basetextdocumentlayout.h

@@ -104,7 +104,8 @@ public:
     static MatchType checkClosedParenthesis(QTextCursor *cursor, QChar c);
     static MatchType matchCursorBackward(QTextCursor *cursor);
     static MatchType matchCursorForward(QTextCursor *cursor);
-    static bool findPreviousOpenParenthesis(QTextCursor *cursor, bool select = false);
+    static bool findPreviousOpenParenthesis(QTextCursor *cursor, bool select = false,
+                                            bool onlyInCurrentBlock = false);
     static bool findNextClosingParenthesis(QTextCursor *cursor, bool select = false);
 
     static bool findPreviousBlockOpenParenthesis(QTextCursor *cursor, bool checkStartPosition = false);

src/plugins/texteditor/basetexteditor.cpp

@@ -865,7 +865,7 @@ static QTextCursor flippedCursor(const QTextCursor &cursor)
     return flipped;
 }
 
-void BaseTextEditorWidget::selectBlockUp()
+bool BaseTextEditorWidget::selectBlockUp()
 {
     QTextCursor cursor = textCursor();
     if (!cursor.hasSelection())
@@ -873,22 +873,23 @@ void BaseTextEditorWidget::selectBlockUp()
     else
         cursor.setPosition(cursor.selectionStart());
 
-
     if (!TextBlockUserData::findPreviousOpenParenthesis(&cursor, false))
-        return;
+        return false;
     if (!TextBlockUserData::findNextClosingParenthesis(&cursor, true))
-        return;
+        return false;
+
     setTextCursor(flippedCursor(cursor));
     _q_matchParentheses();
+    return true;
 }
 
-void BaseTextEditorWidget::selectBlockDown()
+bool BaseTextEditorWidget::selectBlockDown()
 {
     QTextCursor tc = textCursor();
     QTextCursor cursor = d->m_selectBlockAnchor;
 
     if (!tc.hasSelection() || cursor.isNull())
-        return;
+        return false;
     tc.setPosition(tc.selectionStart());
 
     forever {
@@ -904,6 +905,7 @@ void BaseTextEditorWidget::selectBlockDown()
 
     setTextCursor(flippedCursor(cursor));
     _q_matchParentheses();
+    return true;
 }
 
 void BaseTextEditorWidget::copyLineUp()
@@ -4214,6 +4216,18 @@ void BaseTextEditorWidget::mouseReleaseEvent(QMouseEvent *e)
     QPlainTextEdit::mouseReleaseEvent(e);
 }
 
+void BaseTextEditorWidget::mouseDoubleClickEvent(QMouseEvent *e)
+{
+    QTextCursor cursor = textCursor();
+    const int position = cursor.position();
+    if (TextBlockUserData::findPreviousOpenParenthesis(&cursor, false, true)) {
+        if (position - cursor.position() == 1 && selectBlockUp())
+            return;
+    }
+
+    QPlainTextEdit::mouseDoubleClickEvent(e);
+}
+
 void BaseTextEditorWidget::leaveEvent(QEvent *e)
 {
     // Clear link emulation when the mouse leaves the editor

src/plugins/texteditor/basetexteditor.h

@@ -298,8 +298,8 @@ public slots:
     void gotoNextWordCamelCase();
     void gotoNextWordCamelCaseWithSelection();
 
-    void selectBlockUp();
-    void selectBlockDown();
+    bool selectBlockUp();
+    bool selectBlockDown();
 
     void moveLineUp();
     void moveLineDown();
@@ -454,6 +454,7 @@ protected:
     void mouseMoveEvent(QMouseEvent *);
     void mousePressEvent(QMouseEvent *);
     void mouseReleaseEvent(QMouseEvent *);
+    void mouseDoubleClickEvent(QMouseEvent *);
     void leaveEvent(QEvent *);
     void keyReleaseEvent(QKeyEvent *);