Show checkboard pattern behind semi-transparent colors in swatch grid

qgis · Aug 14, 2014 · 0954789 · 0954789
1 parent 8a2f150
commit 0954789
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diff --git a/src/gui/qgscolorswatchgrid.cpp b/src/gui/qgscolorswatchgrid.cpp
@@ -279,7 +279,21 @@ void QgsColorSwatchGrid::draw( QPainter &painter )
 
     if ( mCurrentHoverBox == index )
     {
+      //hovered boxes are slightly larger
       swatchRect.adjust( -1, -1, 1, 1 );
+    }
+
+    //start with checkboard pattern for semi-transparent colors
+    if (( *colorIt ).first.alpha() != 255 )
+    {
+      QBrush checkBrush = QBrush( transparentBackground() );
+      painter.setPen( Qt::NoPen );
+      painter.setBrush( checkBrush );
+      painter.drawRect( swatchRect );
+    }
+
+    if ( mCurrentHoverBox == index )
+    {
       if ( mDrawBoxDepressed )
       {
         painter.setPen( QColor( 100, 100, 100 ) );
@@ -306,6 +320,16 @@ void QgsColorSwatchGrid::draw( QPainter &painter )
   }
 }
 
+const QPixmap& QgsColorSwatchGrid::transparentBackground()
+{
+  static QPixmap transpBkgrd;
+
+  if ( transpBkgrd.isNull() )
+    transpBkgrd = QgsApplication::getThemePixmap( "/transp-background_8x8.png" );
+
+  return transpBkgrd;
+}
+
 int QgsColorSwatchGrid::swatchForPosition( const QPoint &position ) const
 {
   //calculate box for position

diff --git a/src/gui/qgscolorswatchgrid.h b/src/gui/qgscolorswatchgrid.h
@@ -140,6 +140,11 @@ class GUI_EXPORT QgsColorSwatchGrid: public QWidget
      * @param colorIdx color index to use for calculating tooltip
      */
     void updateTooltip( const int colorIdx );
+
+    /**Generates a checkboard pattern for transparent color backgrounds
+     * @returns checkboard pixmap
+     */
+    const QPixmap &transparentBackground();
 };