Turn off rendering while looping through all layers hinding/showing. Fixes #1856

homann · homann · commit d44fe7933fd3 · 2009-08-04T12:22:55.000Z
git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@11263 c8812cc2-4d05-0410-92ff-de0c093fc19c
diff --git a/src/app/legend/qgslegend.cpp b/src/app/legend/qgslegend.cpp
@@ -138,6 +138,10 @@ void QgsLegend::selectAll( bool select )
     return;
   }
 
+  // Turn off rendering to improve speed.
+  bool renderFlagState = mMapCanvas->renderFlag();
+  mMapCanvas->setRenderFlag( false );
+
   QTreeWidgetItem* theItem = firstItem();
 
   while ( theItem )
@@ -150,6 +154,8 @@ void QgsLegend::selectAll( bool select )
     }
     theItem = nextItem( theItem );
   }
+  // Turn on rendering (if it was on previously)
+  mMapCanvas->setRenderFlag( renderFlagState );
 }
 
 void QgsLegend::removeLayer( QString layer_key )

Original file line number	Diff line number	Diff line change
`@@ -138,6 +138,10 @@ void QgsLegend::selectAll( bool select )`
`138`	`138`	`return;`
`139`	`139`	`}`
`140`	`140`
	`141`	`+ // Turn off rendering to improve speed.`
	`142`	`+ bool renderFlagState = mMapCanvas->renderFlag();`
	`143`	`+ mMapCanvas->setRenderFlag( false );`
	`144`	`+`
`141`	`145`	`QTreeWidgetItem* theItem = firstItem();`
`142`	`146`
`143`	`147`	`while ( theItem )`
`@@ -150,6 +154,8 @@ void QgsLegend::selectAll( bool select )`
`150`	`154`	`}`
`151`	`155`	`theItem = nextItem( theItem );`
`152`	`156`	`}`
	`157`	`+ // Turn on rendering (if it was on previously)`
	`158`	`+ mMapCanvas->setRenderFlag( renderFlagState );`
`153`	`159`	`}`
`154`	`160`
`155`	`161`	`void QgsLegend::removeLayer( QString layer_key )`