Live widget updates in graduated symbol renderer when symbol, breaks,

break type, field, or ramp changes.

Author: NathanW2

src/core/symbology-ng/qgsgraduatedsymbolrendererv2.cpp

@@ -1017,6 +1017,33 @@ void QgsGraduatedSymbolRendererV2::setSourceColorRamp( QgsVectorColorRampV2* ram
   mSourceColorRamp = ramp;
 }
 
+void QgsGraduatedSymbolRendererV2::updateColorRamp( QgsVectorColorRampV2 *ramp )
+{
+  int i = 0;
+  foreach( QgsRendererRangeV2 range, mRanges )
+  {
+    QgsSymbolV2* symbol = range.symbol()->clone();
+    double colorValue = ( mRanges.count() > 1 ? ( double ) i / ( mRanges.count() - 1 ) : 0 );
+    symbol->setColor( ramp->color( colorValue ) );
+    updateRangeSymbol( i, symbol );
+    ++i;
+  }
+  this->setSourceColorRamp( ramp );
+}
+
+void QgsGraduatedSymbolRendererV2::updateSymbols( QgsSymbolV2 *sym )
+{
+  int i = 0;
+  foreach( QgsRendererRangeV2 range, mRanges )
+  {
+    QgsSymbolV2* symbol = sym->clone();
+    symbol->setColor( range.symbol()->color() );
+    updateRangeSymbol( i, symbol );
+    ++i;
+  }
+  this->setSourceSymbol( sym->clone() );
+}
+
 void QgsGraduatedSymbolRendererV2::addClass( QgsSymbolV2* symbol )
 {
   QgsSymbolV2* newSymbol = symbol->clone();

src/core/symbology-ng/qgsgraduatedsymbolrendererv2.h

@@ -114,6 +114,14 @@ class CORE_EXPORT QgsGraduatedSymbolRendererV2 : public QgsFeatureRendererV2
     QgsVectorColorRampV2* sourceColorRamp();
     void setSourceColorRamp( QgsVectorColorRampV2* ramp );
 
+    /** Update the color ramp used. Also updates all symbols colors.
+      * Doesn't alter current breaks.
+      */
+    void updateColorRamp( QgsVectorColorRampV2* ramp );
+
+    /** Update the all symbols but leave breaks and colors. */
+    void updateSymbols( QgsSymbolV2* sym );
+
     //! @note added in 1.6
     void setRotationField( QString fieldName ) { mRotationField = fieldName; }
     //! @note added in 1.6

src/gui/symbology-ng/qgsgraduatedsymbolrendererv2widget.cpp

@@ -65,11 +65,13 @@ QgsGraduatedSymbolRendererV2Widget::QgsGraduatedSymbolRendererV2Widget( QgsVecto
   connect( btnGraduatedDelete, SIGNAL( clicked() ), this, SLOT( deleteCurrentClass() ) );
   connect( btnGraduatedAdd, SIGNAL( clicked() ), this, SLOT( addClass() ) );
 
-
-
   // initialize from previously set renderer
   updateUiFromRenderer();
 
+  connect( spinGraduatedClasses, SIGNAL( valueChanged( int ) ) , this, SLOT( classifyGraduated() ) );
+  connect( cboGraduatedMode, SIGNAL( currentIndexChanged( int ) ) , this, SLOT( classifyGraduated() ) );
+  connect( cboGraduatedColorRamp, SIGNAL( currentIndexChanged( int ) ) , this, SLOT( reapplyColorRamp() ) );
+
   // menus for data-defined rotation/size
   QMenu* advMenu = new QMenu;
 
@@ -145,6 +147,7 @@ void QgsGraduatedSymbolRendererV2Widget::populateColumns()
 void QgsGraduatedSymbolRendererV2Widget::graduatedColumnChanged()
 {
   mRenderer->setClassAttribute( cboGraduatedColumn->currentText() );
+  classifyGraduated();
 }
 
 
@@ -194,13 +197,25 @@ void QgsGraduatedSymbolRendererV2Widget::classifyGraduated()
   populateRanges();
 }
 
+void QgsGraduatedSymbolRendererV2Widget::reapplyColorRamp()
+{
+  QgsVectorColorRampV2* ramp = cboGraduatedColorRamp->currentColorRamp();
+  if ( ramp == NULL )
+    return;
+
+  mRenderer->updateColorRamp( ramp );
+  refreshSymbolView();
+}
+
 void QgsGraduatedSymbolRendererV2Widget::changeGraduatedSymbol()
 {
   QgsSymbolV2SelectorDialog dlg( mGraduatedSymbol, mStyle, mLayer, this );
   if ( !dlg.exec() )
     return;
 
   updateGraduatedSymbolIcon();
+  mRenderer->updateSymbols( mGraduatedSymbol );
+  refreshSymbolView();
 }
 
 void QgsGraduatedSymbolRendererV2Widget::updateGraduatedSymbolIcon()

src/gui/symbology-ng/qgsgraduatedsymbolrendererv2widget.h

@@ -24,6 +24,7 @@ class GUI_EXPORT QgsGraduatedSymbolRendererV2Widget : public QgsRendererV2Widget
     void changeGraduatedSymbol();
     void graduatedColumnChanged();
     void classifyGraduated();
+    void reapplyColorRamp();
     void rangesDoubleClicked( const QModelIndex & idx );
     void rangesClicked( const QModelIndex & idx );
     void changeCurrentValue( QStandardItem * item );