Legend items for singleband gray renderer

Author: mhugent

src/core/raster/qgssinglebandgrayrenderer.cpp

@@ -190,3 +190,12 @@ void QgsSingleBandGrayRenderer::writeXML( QDomDocument& doc, QDomElement& parent
   }
   parentElem.appendChild( rasterRendererElem );
 }
+
+void QgsSingleBandGrayRenderer::legendSymbologyItems( QList< QPair< QString, QColor > >& symbolItems ) const
+{
+  if ( mContrastEnhancement && mContrastEnhancement->contrastEnhancementAlgorithm() != QgsContrastEnhancement::NoEnhancement )
+  {
+    symbolItems.push_back( qMakePair( QString::number( mContrastEnhancement->minimumValue() ), QColor( 0, 0, 0 ) ) );
+    symbolItems.push_back( qMakePair( QString::number( mContrastEnhancement->maximumValue() ), QColor( 255, 255, 255 ) ) );
+  }
+}

src/core/raster/qgssinglebandgrayrenderer.h

@@ -41,6 +41,8 @@ class QgsSingleBandGrayRenderer: public QgsRasterRenderer
 
     void writeXML( QDomDocument& doc, QDomElement& parentElem ) const;
 
+    void legendSymbologyItems( QList< QPair< QString, QColor > >& symbolItems ) const;
+
   private:
     int mGrayBand;
     QgsContrastEnhancement* mContrastEnhancement;