[FEATURE]: pan to current feature in attribute table

qgis · Jul 14, 2016 · 48da1de · 48da1de
1 parent b61641d
commit 48da1de
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Showing 4 changed files with 78 additions and 11 deletions.
diff --git a/src/gui/attributetable/qgsdualview.cpp b/src/gui/attributetable/qgsdualview.cpp
@@ -430,6 +430,7 @@ void QgsDualView::viewWillShowContextMenu( QMenu* menu, const QModelIndex& atInd
   if ( canvas && vl && vl->geometryType() != QGis::NoGeometry )
   {
     menu->addAction( tr( "Zoom to feature" ), this, SLOT( zoomToCurrentFeature() ) );
+    menu->addAction( tr( "Pan to feature" ), this, SLOT( panToCurrentFeature() ) );
   }
 
   //add user-defined actions to context menu
@@ -651,6 +652,23 @@ void QgsDualView::zoomToCurrentFeature()
   }
 }
 
+void QgsDualView::panToCurrentFeature()
+{
+  QModelIndex currentIndex = mTableView->currentIndex();
+  if ( !currentIndex.isValid() )
+  {
+    return;
+  }
+
+  QgsFeatureIds ids;
+  ids.insert( mFilterModel->rowToId( currentIndex ) );
+  QgsMapCanvas* canvas = mFilterModel->mapCanvas();
+  if ( canvas )
+  {
+    canvas->panToFeatureIds( mLayerCache->layer(), ids );
+  }
+}
+
 void QgsDualView::previewExpressionChanged( const QString& expression )
 {
   mLayerCache->layer()->setDisplayExpression( expression );

diff --git a/src/gui/attributetable/qgsdualview.h b/src/gui/attributetable/qgsdualview.h
@@ -317,6 +317,8 @@ class GUI_EXPORT QgsDualView : public QStackedWidget, private Ui::QgsDualViewBas
 
     /** Zooms to the active feature*/
     void zoomToCurrentFeature();
+    /** Pans to the active feature*/
+    void panToCurrentFeature();
 
   private:
     void initLayerCache( QgsVectorLayer *layer, bool cacheGeometry );

diff --git a/src/gui/qgsmapcanvas.cpp b/src/gui/qgsmapcanvas.cpp
@@ -1162,39 +1162,74 @@ void QgsMapCanvas::zoomToFeatureIds( QgsVectorLayer* layer, const QgsFeatureIds&
     return;
   }
 
+  QgsRectangle bbox;
+  QString errorMsg;
+  if ( boundingBoxOfFeatureIds( ids, layer, bbox, errorMsg ) )
+  {
+    zoomToFeatureExtent( bbox );
+  }
+  else
+  {
+    emit messageEmitted( tr( "Zoom to feature id failed" ), errorMsg, QgsMessageBar::WARNING );
+  }
+
+}
+
+void QgsMapCanvas::panToFeatureIds( QgsVectorLayer* layer, const QgsFeatureIds& ids )
+{
+  if ( !layer )
+  {
+    return;
+  }
+
+  QgsRectangle bbox;
+  QString errorMsg;
+  if ( boundingBoxOfFeatureIds( ids, layer, bbox, errorMsg ) )
+  {
+    setCenter( bbox.center() );
+    refresh();
+  }
+  else
+  {
+    emit messageEmitted( tr( "Pan to feature id failed" ), errorMsg, QgsMessageBar::WARNING );
+  }
+}
+
+bool QgsMapCanvas::boundingBoxOfFeatureIds( const QgsFeatureIds& ids, QgsVectorLayer* layer, QgsRectangle& bbox, QString& errorMsg ) const
+{
   QgsFeatureIterator it = layer->getFeatures( QgsFeatureRequest().setFilterFids( ids ).setSubsetOfAttributes( QgsAttributeList() ) );
-  QgsRectangle rect;
-  rect.setMinimal();
+  bbox.setMinimal();
   QgsFeature fet;
   int featureCount = 0;
+  errorMsg.clear();
+
   while ( it.nextFeature( fet ) )
   {
     const QgsGeometry* geom = fet.constGeometry();
-    QString errorMessage;
     if ( !geom || geom->isEmpty() )
     {
-      errorMessage = tr( "Feature does not have a geometry" );
+      errorMsg = tr( "Feature does not have a geometry" );
     }
     else if ( geom->geometry()->isEmpty() )
     {
-      errorMessage = tr( "Feature geometry is empty" );
+      errorMsg = tr( "Feature geometry is empty" );
     }
-    if ( !errorMessage.isEmpty() )
+    if ( !errorMsg.isEmpty() )
     {
-      emit messageEmitted( tr( "Zoom to feature id failed" ), errorMessage, QgsMessageBar::WARNING );
-      return;
+      return false;
     }
     QgsRectangle r = mapSettings().layerExtentToOutputExtent( layer, geom->boundingBox() );
-    rect.combineExtentWith( r );
+    bbox.combineExtentWith( r );
     featureCount++;
   }
 
   if ( featureCount != ids.count() )
   {
-    return;
+    errorMsg = tr( "Feature not found" );
+    return false;
   }
 
-  zoomToFeatureExtent( rect );
+  return true;
 }
 
 void QgsMapCanvas::panToSelected( QgsVectorLayer* layer )

diff --git a/src/gui/qgsmapcanvas.h b/src/gui/qgsmapcanvas.h
@@ -253,6 +253,11 @@ class GUI_EXPORT QgsMapCanvas : public QGraphicsView
         @param ids the feature ids*/
     void zoomToFeatureIds( QgsVectorLayer* layer, const QgsFeatureIds& ids );
 
+    /** Centers canvas extent to feature ids
+        @param layer the vector layer
+        @param ids the feature ids*/
+    void panToFeatureIds( QgsVectorLayer* layer, const QgsFeatureIds& ids );
+
     /** Pan to the selected features of current (vector) layer keeping same extent. */
     void panToSelected( QgsVectorLayer* layer = nullptr );
 
@@ -813,6 +818,13 @@ class GUI_EXPORT QgsMapCanvas : public QGraphicsView
      */
     void endZoomRect( QPoint pos );
 
+    /** Returns bounding box of feature list (in canvas coordinates)
+        @param ids feature id list
+        @param bbox out: bounding box
+        @param errorMsg error message in case of error
+        @return true in case of success*/
+    bool boundingBoxOfFeatureIds( const QgsFeatureIds& ids, QgsVectorLayer* layer, QgsRectangle& bbox, QString& errorMsg ) const;
+
     friend class TestQgsMapCanvas;
 
 }; // class QgsMapCanvas