Added hook for a provider to indicate it supports saving its data to a shapefile. If supported, an item is added to the popup context menu. The save function is not implmented yet.

git-svn-id: http://svn.osgeo.org/qgis/trunk@2319 c8812cc2-4d05-0410-92ff-de0c093fc19c

providers/postgres/qgspostgresprovider.h

@@ -178,6 +178,7 @@ class QgsPostgresProvider:public QgsVectorDataProvider
 
   bool supportsFeatureDeletion(){return true;}
 
+  bool supportsSaveAsShapefile(){return true;}
   /** Accessor for sql where clause used to limit dataset */
   QString subsetString() {return sqlWhereClause;};
   //! Get the postgres connection

src/qgsvectordataprovider.cpp

@@ -51,3 +51,9 @@ bool QgsVectorDataProvider::supportsFeatureDeletion()
     //needs to be overwritten by providers which support this
     return false;
 }
+
+bool QgsVectorDataProvider::supportsSaveAsShapefile()
+{
+  // default implementation is no support 
+  return true; 
+}

src/qgsvectordataprovider.h

@@ -117,6 +117,9 @@ class QgsVectorDataProvider: public QgsDataProvider
 
   /**Returns true if a provider supports deleting features*/
   virtual bool supportsFeatureDeletion();
+
+  /** Returns true is the provider supports saving to shapefile*/
+   virtual bool supportsSaveAsShapefile();
 };
 
 #endif

src/qgsvectorlayer.cpp

@@ -786,6 +786,13 @@ void QgsVectorLayer::select(int number)
       popMenu->insertItem(tr("Start editing"),this,SLOT(startEditing()));
       popMenu->insertItem(tr("Stop editing"),this,SLOT(stopEditing()));
 
+      // XXX Can we ask the provider if it wants to add things to the context menu?
+      if(dataProvider->supportsSaveAsShapefile())
+      {
+        // add the save as shapefile menu item
+        popMenu->insertItem(tr("Save as shapefile..."), this, SLOT(saveAsShapefile()));
+      }
+
     } // QgsVectorLayer::initContextMenu_(QgisApp * app)
 
 
@@ -2067,3 +2074,7 @@ void QgsVectorLayer::drawFeature(QPainter* p, QgsFeature* fet, QgsCoordinateTran
           break;
   }
 }
+
+void QgsVectorLayer::saveAsShapefile(){
+  QMessageBox::information(0,"Save As Shapefile", "Someday...");
+}

src/qgsvectorlayer.h

@@ -232,6 +232,8 @@ class QgsVectorLayer : public QgsMapLayer
   /**Returns true if the provider has been modified since the last commit*/
   virtual bool isModified() const {return mModified;}
 
+  //! Save as shapefile
+  void saveAsShapefile();
 protected:
   /**Pointer to the table display object if there is one, else a pointer to 0*/
     QgsAttributeTableDisplay * tabledisplay;