Only update CAD canvas item geometry when necessary

The call to setRect() in paint() handler was triggering canvas redraws all the time, keeping one CPU core busy nearly all the time when CAD dock was active.
qgis · Sep 12, 2017 · 407baf0 · 407baf0
1 parent 684e1da
commit 407baf0
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/gui/qgsadvanceddigitizingcanvasitem.cpp b/src/gui/qgsadvanceddigitizingcanvasitem.cpp
@@ -42,7 +42,8 @@ void QgsAdvancedDigitizingCanvasItem::paint( QPainter* painter )
     return;
 
   QgsRectangle mapRect = mMapCanvas->extent();
-  setRect( mapRect );
+  if ( rect() != mapRect )
+    setRect( mapRect );
 
   int nPoints = mAdvancedDigitizingDockWidget->pointsCount();
   if ( !nPoints )