Automatically update map canvas if set to a user crs and the user cha…

…nges that crs definition, instead of getting stuck with an old definition of the crs
qgis · Jan 29, 2021 · ea57cfe · ea57cfe
1 parent 8362c76
commit ea57cfe
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/src/gui/qgsmapcanvas.cpp b/src/gui/qgsmapcanvas.cpp
@@ -85,6 +85,7 @@ email                : sherman at mrcc.com
 #include "qgsprojectionselectiondialog.h"
 #include "qgsannotationlayer.h"
 #include "qgsmaplayerelevationproperties.h"
+#include "qgscoordinatereferencesystemregistry.h"
 
 /**
  * \ingroup gui
@@ -169,6 +170,17 @@ QgsMapCanvas::QgsMapCanvas( QWidget *parent )
       emit transformContextChanged();
       refresh();
     } );
+
+    connect( QgsApplication::coordinateReferenceSystemRegistry(), &QgsCoordinateReferenceSystemRegistry::userCrsChanged, this, [ = ]
+    {
+      QgsCoordinateReferenceSystem crs = mSettings.destinationCrs();
+      crs.updateDefinition();
+      if ( mSettings.destinationCrs() != crs )
+      {
+        // user crs has changed definition, refresh the map
+        setDestinationCrs( crs );
+      }
+    } );
   }
 
   // refresh canvas when a remote svg/image has finished downloading