Hide color schemes from color button menu if they contain no colors

Author: nyalldawson

python/gui/qgscolorswatchgrid.sip

@@ -53,6 +53,11 @@ class QgsColorSwatchGrid: QWidget
      * @see baseColor
      */
     void setBaseColor( const QColor baseColor );
+    
+    /**Gets the list of colors shown in the grid
+     * @returns list of colors currently shown in the grid
+     */
+    QgsNamedColorList* colors();
 
   public slots:
 

src/gui/qgscolorswatchgrid.cpp

@@ -335,11 +335,15 @@ QgsColorSwatchGridAction::QgsColorSwatchGridAction( QgsColorScheme* scheme, QMen
     , mSuppressRecurse( false )
 {
   mColorSwatchGrid = new QgsColorSwatchGrid( scheme, context, parent );
+
   setDefaultWidget( mColorSwatchGrid );
   connect( mColorSwatchGrid, SIGNAL( colorChanged( QColor ) ), this, SLOT( setColor( QColor ) ) );
 
   connect( this, SIGNAL( hovered() ), this, SLOT( onHover() ) );
   connect( mColorSwatchGrid, SIGNAL( hovered() ), this, SLOT( onHover() ) );
+
+  //hide the action if no colors to be shown
+  setVisible( mColorSwatchGrid->colors()->count() > 0 );
 }
 
 QgsColorSwatchGridAction::~QgsColorSwatchGridAction()
@@ -370,6 +374,8 @@ void QgsColorSwatchGridAction::setContext( const QString context )
 void QgsColorSwatchGridAction::refreshColors()
 {
   mColorSwatchGrid->refreshColors();
+  //hide the action if no colors shown
+  setVisible( mColorSwatchGrid->colors()->count() > 0 );
 }
 
 void QgsColorSwatchGridAction::setColor( const QColor &color )

src/gui/qgscolorswatchgrid.h

@@ -71,6 +71,11 @@ class GUI_EXPORT QgsColorSwatchGrid: public QWidget
      */
     void setBaseColor( const QColor baseColor );
 
+    /**Gets the list of colors shown in the grid
+     * @returns list of colors currently shown in the grid
+     */
+    QgsNamedColorList* colors() { return &mColors; }
+
   public slots:
 
     /**Reload colors from scheme and redraws the widget