Update rubber band after editing nodes

It has to be done this way. Just adding updateSelectFeature() in a few places
is not enough, because then the rubber band will still not be updated after
an undo operation.

Author: dgoedkoop

src/app/nodetool/qgsmaptoolnodetool.cpp

@@ -121,6 +121,13 @@ void QgsMapToolNodeTool::canvasMoveEvent( QgsMapMouseEvent* e )
   {
     if ( mMoveRubberBands.empty() )
     {
+      QSettings settings;
+      bool ghostLine = settings.value( "/qgis/digitizing/line_ghost", false ).toBool();
+      if ( !ghostLine )
+      {
+        delete mSelectRubberBand;
+        mSelectRubberBand = nullptr;
+      }
       QgsGeometryRubberBand* rb = new QgsGeometryRubberBand( mCanvas, mSelectedFeature->geometry()->type() );
       QSettings settings;
       QColor color(
@@ -242,6 +249,7 @@ void QgsMapToolNodeTool::canvasPressEvent( QgsMapMouseEvent* e )
     }
     connect( QgisApp::instance()->layerTreeView(), SIGNAL( currentLayerChanged( QgsMapLayer* ) ), this, SLOT( currentLayerChanged( QgsMapLayer* ) ) );
     connect( mSelectedFeature, SIGNAL( destroyed() ), this, SLOT( selectedFeatureDestroyed() ) );
+    connect( vlayer, SIGNAL( geometryChanged( QgsFeatureId, QgsGeometry & ) ), this, SLOT( geometryChanged( QgsFeatureId, QgsGeometry & ) ) );
     connect( vlayer, SIGNAL( editingStopped() ), this, SLOT( editingToggled() ) );
     mIsPoint = vlayer->geometryType() == QGis::Point;
     mNodeEditor = new QgsNodeEditor( vlayer, mSelectedFeature, mCanvas );
@@ -370,25 +378,37 @@ void QgsMapToolNodeTool::canvasPressEvent( QgsMapMouseEvent* e )
 
 void QgsMapToolNodeTool::updateSelectFeature()
 {
-  delete mSelectRubberBand;
+  updateSelectFeature( *mSelectedFeature->geometry() );
+}
 
-  mSelectRubberBand = new QgsGeometryRubberBand( mCanvas, mSelectedFeature->geometry()->type() );
-  mSelectRubberBand->setBrushStyle( Qt::SolidPattern );
+void QgsMapToolNodeTool::updateSelectFeature( QgsGeometry &geom )
+{
+  delete mSelectRubberBand;
 
-  QSettings settings;
-  QColor color(
-    settings.value( "/qgis/digitizing/fill_color_red", 255 ).toInt(),
-    settings.value( "/qgis/digitizing/fill_color_green", 0 ).toInt(),
-    settings.value( "/qgis/digitizing/fill_color_blue", 0 ).toInt() );
-  double myAlpha = settings.value( "/qgis/digitizing/fill_color_alpha", 30 ).toInt() / 255.0 ;
-  color.setAlphaF( myAlpha );
-  mSelectRubberBand->setFillColor( color );
-
-  QgsAbstractGeometryV2* rbGeom = mSelectedFeature->geometry()->geometry()->clone();
-  QgsVectorLayer *vlayer = mSelectedFeature->vlayer();
-  if ( mCanvas->mapSettings().layerTransform( vlayer ) )
-    rbGeom->transform( *mCanvas->mapSettings().layerTransform( vlayer ) );
-  mSelectRubberBand->setGeometry( rbGeom );
+  if ( geom.geometry() )
+  {
+    mSelectRubberBand = new QgsGeometryRubberBand( mCanvas, mSelectedFeature->geometry()->type() );
+    mSelectRubberBand->setBrushStyle( Qt::SolidPattern );
+
+    QSettings settings;
+    QColor color(
+      settings.value( "/qgis/digitizing/fill_color_red", 255 ).toInt(),
+      settings.value( "/qgis/digitizing/fill_color_green", 0 ).toInt(),
+      settings.value( "/qgis/digitizing/fill_color_blue", 0 ).toInt() );
+    double myAlpha = settings.value( "/qgis/digitizing/fill_color_alpha", 30 ).toInt() / 255.0 ;
+    color.setAlphaF( myAlpha );
+    mSelectRubberBand->setFillColor( color );
+
+    QgsAbstractGeometryV2* rbGeom = geom.geometry()->clone();
+    QgsVectorLayer *vlayer = mSelectedFeature->vlayer();
+    if ( mCanvas->mapSettings().layerTransform( vlayer ) )
+      rbGeom->transform( *mCanvas->mapSettings().layerTransform( vlayer ) );
+    mSelectRubberBand->setGeometry( rbGeom );
+  }
+  else
+  {
+    mSelectRubberBand = nullptr;
+  }
 }
 
 void QgsMapToolNodeTool::selectedFeatureDestroyed()
@@ -397,6 +417,16 @@ void QgsMapToolNodeTool::selectedFeatureDestroyed()
   cleanTool( false );
 }
 
+void QgsMapToolNodeTool::geometryChanged( QgsFeatureId fid, QgsGeometry &geom )
+{
+  QSettings settings;
+  bool ghostLine = settings.value( "/qgis/digitizing/line_ghost", false ).toBool();
+  if ( !ghostLine && mSelectedFeature && ( mSelectedFeature->featureId() == fid ) )
+  {
+    updateSelectFeature( geom );
+  }
+}
+
 void QgsMapToolNodeTool::currentLayerChanged( QgsMapLayer *layer )
 {
   if ( mSelectedFeature && layer != mSelectedFeature->vlayer() )
@@ -512,8 +542,6 @@ void QgsMapToolNodeTool::canvasReleaseEvent( QgsMapMouseEvent* e )
 
     mDeselectOnRelease = -1;
   }
-
-  updateSelectFeature();
 }
 
 void QgsMapToolNodeTool::deactivate()

src/app/nodetool/qgsmaptoolnodetool.h

@@ -50,6 +50,11 @@ class QgsMapToolNodeTool: public QgsMapToolEdit
   public slots:
     void selectedFeatureDestroyed();
 
+    /*
+     * the geometry for the selected feature has changed
+     */
+    void geometryChanged( QgsFeatureId fid, QgsGeometry &geom );
+
     /*
      * the current layer changed
      */
@@ -71,6 +76,11 @@ class QgsMapToolNodeTool: public QgsMapToolEdit
      */
     void updateSelectFeature();
 
+    /**
+     * Update select feature rubber band using a certain geometry
+     */
+    void updateSelectFeature( QgsGeometry &geom );
+
     /**
      * Deletes the rubber band pointers and clears mRubberBands
      */

src/app/qgsoptions.cpp

@@ -804,6 +804,8 @@ QgsOptions::QgsOptions( QWidget *parent, Qt::WindowFlags fl ) :
   mFillColorToolButton->setContext( "gui" );
   mFillColorToolButton->setDefaultColor( QColor( 255, 0, 0, 30 ) );
 
+  mLineGhostCheckBox->setChecked( settings.value( "/qgis/digitizing/line_ghost", false ).toBool() );
+
   //default snap mode
   mDefaultSnapModeComboBox->insertItem( 0, tr( "To vertex" ), "to vertex" );
   mDefaultSnapModeComboBox->insertItem( 1, tr( "To segment" ), "to segment" );
@@ -1305,6 +1307,8 @@ void QgsOptions::saveOptions()
   mSettings->setValue( "/qgis/digitizing/fill_color_blue", digitizingColor.blue() );
   mSettings->setValue( "/qgis/digitizing/fill_color_alpha", digitizingColor.alpha() );
 
+  settings.setValue( "/qgis/digitizing/line_ghost", mLineGhostCheckBox->isChecked() );
+
   //default snap mode
   QString defaultSnapModeString = mDefaultSnapModeComboBox->itemData( mDefaultSnapModeComboBox->currentIndex() ).toString();
   mSettings->setValue( "/qgis/digitizing/default_snap_mode", defaultSnapModeString );

src/ui/qgsoptionsbase.ui

@@ -3670,6 +3670,13 @@
                     </property>
                    </widget>
                   </item>
+                  <item row="1" column="0" colspan="7">
+                   <widget class="QCheckBox" name="mLineGhostCheckBox">
+                    <property name="text">
+                     <string>Don't update rubber band during node editing</string>
+                    </property>
+                   </widget>
+                  </item>
                  </layout>
                 </widget>
                </item>