Added saving layer's selection as a shapefile. Can be invoked from legend.

git-svn-id: http://svn.osgeo.org/qgis/trunk@6940 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: wonder

python/core/qgsvectorfilewriter.sip

@@ -27,7 +27,8 @@ public:
     /** Write contents of vector layer to a shapefile */
     static WriterError writeAsShapefile(QgsVectorLayer* layer,
                                         const QString& shapefileName,
-                                        const QString& fileEncoding);
+                                        const QString& fileEncoding,
+                                        bool onlySelected = FALSE);
 
 
     /** create shapefile and initialize it */

src/app/legend/qgslegendlayer.cpp

@@ -513,10 +513,17 @@ void QgsLegendLayer::addToPopupMenu(QMenu& theMenu)
     }
 
     // save as shapefile
-    theMenu.addAction(tr("Save as shapefile..."), this, SLOT(saveAsShapefile()));
+    QAction* saveShpAction = theMenu.addAction(tr("Save as shapefile..."), this, SLOT(saveAsShapefile()));
     if (files.size() != 1)
     {
-      tableAction->setEnabled(false);
+      saveShpAction->setEnabled(false);
+    }
+    
+    // save selection as shapefile
+    QAction* saveSelectionAction = theMenu.addAction(tr("Save selection as shapefile..."), this, SLOT(saveSelectionAsShapefile()));
+    if (files.size() != 1 || theVectorLayer->selectedFeatureCount() == 0)
+    {
+      saveSelectionAction->setEnabled(false);
     }
 
     theMenu.addSeparator();
@@ -598,3 +605,12 @@ void QgsLegendLayer::saveAsShapefile()
     maplayers.front()->saveAsShapefile();
   }
 }
+
+void QgsLegendLayer::saveSelectionAsShapefile()
+{
+  std::list<QgsLegendLayerFile*> maplayers = legendLayerFiles();
+  if (maplayers.size() == 1)
+  {
+    maplayers.front()->saveSelectionAsShapefile();
+  }
+}

src/app/legend/qgslegendlayer.h

@@ -91,6 +91,7 @@ class QgsLegendLayer : public QgsLegendItem
     void toggleEditing();
 
     void saveAsShapefile();
+    void saveSelectionAsShapefile();
 
   protected:
 

src/app/legend/qgslegendlayerfile.cpp

@@ -293,6 +293,16 @@ void QgsLegendLayerFile::closeTable(bool onlyGeometryWasChanged)
 }
 
 void QgsLegendLayerFile::saveAsShapefile()
+{
+  saveAsShapefileGeneral(FALSE);
+}
+
+void QgsLegendLayerFile::saveSelectionAsShapefile()
+{
+  saveAsShapefileGeneral(TRUE);
+}
+
+void QgsLegendLayerFile::saveAsShapefileGeneral(bool saveOnlySelection)
 {
   if (mLyr.layer()->type() != QgsMapLayer::VECTOR)
     return;
@@ -333,8 +343,12 @@ void QgsLegendLayerFile::saveAsShapefile()
     shapefileName += ".shp";
   }
 
+  QApplication::setOverrideCursor(Qt::waitCursor);
+  
   QgsVectorFileWriter::WriterError error;
-  error = QgsVectorFileWriter::writeAsShapefile(vlayer, shapefileName, encoding);
+  error = QgsVectorFileWriter::writeAsShapefile(vlayer, shapefileName, encoding, saveOnlySelection);
+  
+  QApplication::restoreOverrideCursor();
 
   switch (error)
   {
@@ -460,6 +474,12 @@ void QgsLegendLayerFile::addToPopupMenu(QMenu& theMenu)
     // save as shapefile
     theMenu.addAction(tr("Save as shapefile..."), this, SLOT(saveAsShapefile()));
 
+    QAction* saveSelectionAction = theMenu.addAction(tr("Save selection as shapefile..."), this, SLOT(saveSelectionAsShapefile()));
+    if (vlayer->selectedFeatureCount() == 0)
+    {
+      saveSelectionAction->setEnabled(false);
+    }
+
     theMenu.addSeparator();
   }
   else if (lyr->type() == QgsMapLayer::RASTER)

src/app/legend/qgslegendlayerfile.h

@@ -83,6 +83,9 @@ class QgsLegendLayerFile : public QgsLegendItem
     /**Save as shapefile*/
     void saveAsShapefile();
 
+    /**Save selection as shapefile*/
+    void saveSelectionAsShapefile();
+    
     /**Toggle editing for layer*/
     void toggleEditing();
 
@@ -94,6 +97,9 @@ class QgsLegendLayerFile : public QgsLegendItem
 
  protected:
 
+    /**Save as shapefile (called from saveAsShapefile and saveSelectionAsShapefile)*/
+    void saveAsShapefileGeneral(bool saveOnlySelection);
+
     /** layer identified by its layer id */
     QgsMapCanvasLayer mLyr;
 

src/core/qgsvectorfilewriter.cpp

@@ -292,7 +292,8 @@ QgsVectorFileWriter::~QgsVectorFileWriter()
 QgsVectorFileWriter::WriterError
     QgsVectorFileWriter::writeAsShapefile(QgsVectorLayer* layer,
                                           const QString& shapefileName,
-                                          const QString& fileEncoding)
+                                          const QString& fileEncoding,
+                                          bool onlySelected)
 {
 
   QgsVectorDataProvider* provider = layer->getDataProvider();
@@ -313,14 +314,18 @@ QgsVectorFileWriter::WriterError
 
   provider->select(allAttr, QgsRect(), true);
 
+  const QgsFeatureIds& ids = layer->selectedFeaturesIds();
+
   // write all features
   while (provider->getNextFeature(fet))
   {
+    if (onlySelected && !ids.contains(fet.featureId()))
+      continue;
+      
     writer->addFeature(fet);
   }
 
   delete writer;
 
   return NoError;
 }
-

src/core/qgsvectorfilewriter.h

@@ -53,7 +53,8 @@ class CORE_EXPORT QgsVectorFileWriter
     /** Write contents of vector layer to a shapefile */
     static WriterError writeAsShapefile(QgsVectorLayer* layer,
                                         const QString& shapefileName,
-                                        const QString& fileEncoding);
+                                        const QString& fileEncoding,
+                                        bool onlySelected = FALSE);
 
 
     /** create shapefile and initialize it */