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 11, 2017 · 7c9105d · 7c9105d · 3nids · Sep 12, 2017
1 parent bb20047
commit 7c9105d
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/gui/qgsadvanceddigitizingcanvasitem.cpp b/src/gui/qgsadvanceddigitizingcanvasitem.cpp
@@ -38,7 +38,8 @@ void QgsAdvancedDigitizingCanvasItem::paint( QPainter *painter )
     return;
 
   QgsRectangle mapRect = mMapCanvas->extent();
-  setRect( mapRect );
+  if ( rect() != mapRect )
+    setRect( mapRect );
 
   int nPoints = mAdvancedDigitizingDockWidget->pointsCount();
   if ( !nPoints )