Automatic update of label and neighboring ranges boundaries

Author: leyan

src/gui/symbology-ng/qgsgraduatedsymbolrendererv2widget.cpp

@@ -417,6 +417,7 @@ QgsGraduatedSymbolRendererV2Widget::QgsGraduatedSymbolRendererV2Widget( QgsVecto
   connect( btnGraduatedDelete, SIGNAL( clicked() ), this, SLOT( deleteClasses() ) );
   connect( btnDeleteAllClasses, SIGNAL( clicked() ), this, SLOT( deleteAllClasses() ) );
   connect( btnGraduatedAdd, SIGNAL( clicked() ), this, SLOT( addClass() ) );
+  connect( cbxLinkBoundaries, SIGNAL( toggled( bool ) ), this, SLOT( toggleBoundariesLink( bool ) ) );
 
   // initialize from previously set renderer
   updateUiFromRenderer();
@@ -702,11 +703,57 @@ void QgsGraduatedSymbolRendererV2Widget::changeRange( int rangeIdx )
   {
     double lowerValue = dialog.lowerValue().toDouble();
     double upperValue = dialog.upperValue().toDouble();
+
+    QString label = createLabel( range.lowerValue(), range.upperValue() );
+    QString newLabel;
+
     mRenderer->updateRangeUpperValue( rangeIdx, upperValue );
     mRenderer->updateRangeLowerValue( rangeIdx, lowerValue );
+
+    //If the label was the label automatically generated, we generate a new one for the new range
+    if ( range.label() == label )
+    {
+      newLabel = createLabel( lowerValue, upperValue );
+      mRenderer->updateRangeLabel( rangeIdx, newLabel );
+    }
+
+    //If the boundaries have to stay linked, we update the ranges above and below, as well as their label if needed
+    if ( cbxLinkBoundaries->isChecked() )
+    {
+      if ( rangeIdx > 0 )
+      {
+        const QgsRendererRangeV2& rangeLower = mRenderer->ranges()[rangeIdx - 1];
+        label = createLabel( rangeLower.lowerValue(), rangeLower.upperValue() );
+        mRenderer->updateRangeUpperValue( rangeIdx - 1, lowerValue );
+
+        if ( label == rangeLower.label() )
+        {
+          newLabel = createLabel( rangeLower.lowerValue(), lowerValue );
+          mRenderer->updateRangeLabel( rangeIdx - 1, newLabel );
+        }
+      }
+
+      if ( rangeIdx < mRenderer->ranges().size() - 1 )
+      {
+        const QgsRendererRangeV2& rangeUpper = mRenderer->ranges()[rangeIdx + 1];
+        label = createLabel( rangeUpper.lowerValue(), rangeUpper.upperValue() );
+        mRenderer->updateRangeLowerValue( rangeIdx + 1, upperValue );
+
+        if ( label == rangeUpper.label() )
+        {
+          newLabel = createLabel( upperValue, rangeUpper.upperValue() );
+          mRenderer->updateRangeLabel( rangeIdx + 1, newLabel );
+        }
+      }
+    }
   }
 }
 
+QString QgsGraduatedSymbolRendererV2Widget::createLabel( double lowerValue, double upperValue )
+{
+  return QString::number( lowerValue , 'f', 4 ) + " - " + QString::number( upperValue, 'f', 4 );
+}
+
 void QgsGraduatedSymbolRendererV2Widget::addClass()
 {
   mModel->addClass( mGraduatedSymbol );
@@ -723,6 +770,20 @@ void QgsGraduatedSymbolRendererV2Widget::deleteAllClasses()
   mModel->removeAllRows();
 }
 
+void QgsGraduatedSymbolRendererV2Widget::toggleBoundariesLink( bool linked )
+{
+  //If the checkbox controlling the link between boundaries was unchecked and we check it, we have to link the boundaries
+  //This is done by updating all lower ranges to the upper value of the range above
+  if ( linked )
+  {
+    for ( int i = 1;i < mRenderer->ranges().size();++i )
+    {
+      mRenderer->updateRangeLowerValue( i, mRenderer->ranges()[i-1].upperValue() );
+    }
+    refreshSymbolView();
+  }
+}
+
 void QgsGraduatedSymbolRendererV2Widget::changeCurrentValue( QStandardItem * item )
 {
   if ( item->column() == 2 )

src/gui/symbology-ng/qgsgraduatedsymbolrendererv2widget.h

@@ -94,6 +94,8 @@ class GUI_EXPORT QgsGraduatedSymbolRendererV2Widget : public QgsRendererV2Widget
     void deleteClasses();
     /**Removes all classes from the classification*/
     void deleteAllClasses();
+    /**Toggle the link between classes boundaries */
+    void toggleBoundariesLink( bool linked );
 
     void rotationFieldChanged( QString fldName );
     void sizeScaleFieldChanged( QString fldName );
@@ -115,6 +117,8 @@ class GUI_EXPORT QgsGraduatedSymbolRendererV2Widget : public QgsRendererV2Widget
     void changeRangeSymbol( int rangeIdx );
     void changeRange( int rangeIdx );
 
+    QString createLabel( double lowerValue, double upperValue );
+
     void changeSelectedSymbols();
 
     QList<QgsSymbolV2*> selectedSymbols();

src/ui/qgsgraduatedsymbolrendererv2widget.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>505</width>
+    <width>615</width>
     <height>339</height>
    </rect>
   </property>
@@ -240,6 +240,16 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QCheckBox" name="cbxLinkBoundaries">
+       <property name="text">
+        <string>Link classes boundaries</string>
+       </property>
+       <property name="checked">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
      <item>
       <spacer>
        <property name="orientation">