Add a colorSelected signal to QgsColorSchemeList

Author: nyalldawson

python/gui/qgscolorschemelist.sip

@@ -169,10 +169,21 @@ class QgsColorSchemeList: QTreeView
      * @see pasteColors
      */
     void copyColors();
+    
+  signals:
+
+    /**Emitted when a color is selected from the list
+     * @param color color selected
+     */
+    void colorSelected( const QColor color );
 
   protected:
 
     void keyPressEvent( QKeyEvent* event );
 
+    void mousePressEvent( QMouseEvent* event );
+
+    void mouseReleaseEvent( QMouseEvent* event );
+    
 };
 

src/gui/qgscolorschemelist.cpp

@@ -157,6 +157,35 @@ void QgsColorSchemeList::keyPressEvent( QKeyEvent *event )
   QTreeView::keyPressEvent( event );
 }
 
+void QgsColorSchemeList::mousePressEvent( QMouseEvent *event )
+{
+  if ( event->button() == Qt::LeftButton )
+  {
+    //record press start position
+    mDragStartPosition = event->pos();
+  }
+  QTreeView::mousePressEvent( event );
+}
+
+void QgsColorSchemeList::mouseReleaseEvent( QMouseEvent *event )
+{
+  if (( event->button() == Qt::LeftButton ) &&
+      ( event->pos() - mDragStartPosition ).manhattanLength() <= QApplication::startDragDistance() )
+  {
+    //just a click, not a drag
+
+    //if only one item is selected, emit color changed signal
+    //(if multiple are selected, user probably was interacting with color list rather than trying to pick a color)
+    if ( selectedIndexes().length() == mModel->columnCount() )
+    {
+      QModelIndex selectedColor = selectedIndexes().at( 0 );
+      emit colorSelected( mModel->colors().at( selectedColor.row() ).first );
+    }
+  }
+
+  QTreeView::mouseReleaseEvent( event );
+}
+
 bool QgsColorSchemeList::importColorsFromGpl( QFile &file )
 {
   QgsNamedColorList importedColors;

src/gui/qgscolorschemelist.h

@@ -211,15 +211,28 @@ class GUI_EXPORT QgsColorSchemeList: public QTreeView
      */
     void copyColors();
 
+  signals:
+
+    /**Emitted when a color is selected from the list
+     * @param color color selected
+     */
+    void colorSelected( const QColor color );
+
   protected:
 
     void keyPressEvent( QKeyEvent* event );
 
+    void mousePressEvent( QMouseEvent* event );
+
+    void mouseReleaseEvent( QMouseEvent* event );
+
   private:
     QgsColorScheme* mScheme;
     QgsColorSchemeModel* mModel;
     QgsColorSwatchDelegate* mSwatchDelegate;
 
+    QPoint mDragStartPosition;
+
 };
 
 #endif