added a method to activate/deactivate actions depending on the current layer type and the provider capabilities (though the ogr provider seems to return strange capabilities)

git-svn-id: http://svn.osgeo.org/qgis/trunk@4970 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/gui/qgisapp.cpp

@@ -4842,6 +4842,91 @@ QgsClipboard * QgisApp::clipboard()
   return &mInternalClipboard;
 }
 
+void QgisApp::activateDeactivateLayerRelatedActions(const QgsMapLayer* layer)
+{
+  if(!layer)
+    {
+      return;
+    }
+  if(layer->type() == QgsMapLayer::VECTOR || layer->type() == QgsMapLayer::DATABASE)
+    {
+      mActionSelect->setEnabled(true);
+      mActionOpenTable->setEnabled(true);
+      const QgsVectorLayer* vlayer = dynamic_cast<const QgsVectorLayer*>(layer);
+      const QgsVectorDataProvider* dprovider = vlayer->getDataProvider();
+      if(vlayer)
+	{
+	  //does provider allow deleting of features?
+	  if(dprovider->capabilities() | QgsVectorDataProvider::DeleteFeatures)
+	    {
+	      mActionDeleteSelected->setEnabled(true);
+	    }
+	  else
+	    {
+	      mActionDeleteSelected->setEnabled(false);
+	    }
+
+
+	  if(vlayer->vectorType() == QGis::Point)
+	    {
+	      if(dprovider->capabilities() | QgsVectorDataProvider::AddFeatures)
+		{
+		  mActionCapturePoint->setEnabled(true);
+		}
+	      else
+		{
+		  mActionCapturePoint->setEnabled(false);
+		}
+	      mActionCaptureLine->setEnabled(false);
+	      mActionCapturePolygon->setEnabled(false);
+	      mActionAddVertex->setEnabled(false);
+	      mActionDeleteVertex->setEnabled(false);
+	      mActionMoveVertex->setEnabled(false);
+	      return;
+	    }
+	  else if(vlayer->vectorType() == QGis::Line)
+	    {
+	      mActionCaptureLine->setEnabled(true);
+	      mActionCapturePoint->setEnabled(false);
+	      mActionCapturePolygon->setEnabled(false);
+	    }
+	  else if(vlayer->vectorType() == QGis::Polygon)
+	    {
+	      mActionCapturePolygon->setEnabled(true);
+	      mActionCapturePoint->setEnabled(false);
+	      mActionCaptureLine->setEnabled(false);
+	    }
+
+	  //are add/delete/move vertex supported?
+	  if(dprovider->capabilities() | QgsVectorDataProvider::ChangeGeometries)
+	    {
+	      mActionAddVertex->setEnabled(true);
+	      mActionMoveVertex->setEnabled(true);
+	      mActionDeleteVertex->setEnabled(true);
+	    }
+	  else
+	    {
+	      mActionAddVertex->setEnabled(false);
+	      mActionMoveVertex->setEnabled(false);
+	      mActionDeleteVertex->setEnabled(false);
+	    }
+	  return;
+	}
+    }
+  else if(layer->type() == QgsMapLayer::RASTER)
+    {
+      mActionSelect->setEnabled(false);
+      mActionOpenTable->setEnabled(false);
+      mActionCapturePoint->setEnabled(false);
+      mActionCaptureLine->setEnabled(false);
+      mActionCapturePolygon->setEnabled(false);
+      mActionDeleteSelected->setEnabled(false);
+      mActionAddVertex->setEnabled(false);
+      mActionDeleteVertex->setEnabled(false);
+      mActionMoveVertex->setEnabled(false);
+    }
+}
+
 
 //copy the click coord to clipboard and let the user know its there
 void QgisApp::showCapturePointCoordinate(QgsPoint & theQgsPoint)

src/gui/qgisapp.h

@@ -164,6 +164,9 @@ class QgisApp : public QMainWindow, public Ui::QgisAppBase
   void setupToolbarPopups(QString themeName);
   //! Returns a pointer to the internal clipboard
   QgsClipboard * clipboard();
+  /** Activates or deactivates actions depending on the current maplayer type.
+   Is called from the legend when the current legend item has changed*/
+  void activateDeactivateLayerRelatedActions(const QgsMapLayer* layer);
 
 //private slots:
 public slots:

src/gui/qgsmaplayer.cpp

@@ -95,7 +95,8 @@ QgsMapLayer::~QgsMapLayer()
 {
     //delete mCoordinateTransform; //crash when removing layers. Why?
 }
-const int QgsMapLayer::type()
+
+int QgsMapLayer::type() const
 {
     return layerType;
 }

src/gui/qgsmaplayer.h

@@ -65,7 +65,7 @@ class QgsMapLayer : public QObject
     /*! Get the type of the layer
      * @return Integer matching a value in the LAYERS enum
      */
-    const int type();
+    int type() const;
 
     /*! Get this layer's unique ID */
     QString const & getLayerID() const;

src/gui/qgsvectorlayer.cpp

@@ -1193,6 +1193,11 @@ QgsVectorDataProvider* QgsVectorLayer::getDataProvider()
   return dataProvider;
 }
 
+const QgsVectorDataProvider* QgsVectorLayer::getDataProvider() const
+{
+  return dataProvider;
+}
+
 void QgsVectorLayer::setProviderEncoding(const QString& encoding)
 {
   if(dataProvider)

src/gui/qgsvectorlayer.h

@@ -117,8 +117,12 @@ const QString displayField() const { return fieldIndex; }
   //! Setup the coordinate system tranformation for the layer
   void setCoordinateSystem();
 
+  /**Returns the data provider*/
   QgsVectorDataProvider* getDataProvider();
 
+  /**Returns the data provider in a const-correct manner*/
+  const QgsVectorDataProvider* getDataProvider() const;
+
   /**Sets the textencoding of the data provider*/
   void setProviderEncoding(const QString& encoding);
 

src/legend/qgslegend.cpp

@@ -89,7 +89,14 @@ QgsLegend::~QgsLegend()
 
 void QgsLegend::handleCurrentItemChanged(QTreeWidgetItem* current, QTreeWidgetItem* previous)
 {
-  mMapCanvas->setCurrentLayer(currentLayer());
+  if(mApp)
+    {
+      mApp->activateDeactivateLayerRelatedActions(currentLayer());
+    }
+  if(mMapCanvas)
+    {
+      mMapCanvas->setCurrentLayer(currentLayer());
+    }
 }   
 
 void QgsLegend::addGroup()