add transform context to the map overview

python/gui/qgsmapoverviewcanvas.sip.in

@@ -48,7 +48,15 @@ Returns list of layers visible in the overview
 
     void updateFullExtent();
 
-  public slots:
+  protected slots:
+    void mapRenderingFinished();
+
+    void layerRepaintRequested( bool deferred = false );
+%Docstring
+Triggered when a layer in the overview requests a repaint.
+%End
+
+  protected:
 
     void drawExtentRect();
 %Docstring
@@ -60,16 +68,11 @@ used for overview canvas to reflect changed extent in main map canvas
 Should be called when the canvas destination CRS is changed
 %End
 
-  protected slots:
-    void mapRenderingFinished();
-
-    void layerRepaintRequested( bool deferred = false );
+    void transformContextChanged();
 %Docstring
-Triggered when a layer in the overview requests a repaint.
+Called when the canvas transform context is changed
 %End
 
-  protected:
-
     virtual void paintEvent( QPaintEvent *pe );
 
 %Docstring

src/gui/qgsmapoverviewcanvas.cpp

@@ -40,10 +40,12 @@ QgsMapOverviewCanvas::QgsMapOverviewCanvas( QWidget *parent, QgsMapCanvas *mapCa
   setObjectName( QStringLiteral( "theOverviewCanvas" ) );
   mPanningWidget = new QgsPanningWidget( this );
 
+  mSettings.setTransformContext( mMapCanvas->mapSettings().transformContext() );
   mSettings.setFlag( QgsMapSettings::DrawLabeling, false );
 
   connect( mMapCanvas, &QgsMapCanvas::extentsChanged, this, &QgsMapOverviewCanvas::drawExtentRect );
   connect( mMapCanvas, &QgsMapCanvas::destinationCrsChanged, this, &QgsMapOverviewCanvas::destinationCrsChanged );
+  connect( mMapCanvas, &QgsMapCanvas::transformContextChanged, this, &QgsMapOverviewCanvas::transformContextChanged );
 }
 
 void QgsMapOverviewCanvas::resizeEvent( QResizeEvent *e )
@@ -262,6 +264,11 @@ void QgsMapOverviewCanvas::destinationCrsChanged()
   mSettings.setDestinationCrs( mMapCanvas->mapSettings().destinationCrs() );
 }
 
+void QgsMapOverviewCanvas::transformContextChanged()
+{
+  mSettings.setTransformContext( mMapCanvas->mapSettings().transformContext() );
+}
+
 QList<QgsMapLayer *> QgsMapOverviewCanvas::layers() const
 {
   return mSettings.layers();

src/gui/qgsmapoverviewcanvas.h

@@ -61,16 +61,6 @@ class GUI_EXPORT QgsMapOverviewCanvas : public QWidget
 
     void updateFullExtent();
 
-  public slots:
-
-    // ### QGIS 3: make protected
-    //! used for overview canvas to reflect changed extent in main map canvas
-    void drawExtentRect();
-
-    // ### QGIS 3: make protected
-    //! Should be called when the canvas destination CRS is changed
-    void destinationCrsChanged();
-
   protected slots:
     void mapRenderingFinished();
 
@@ -81,6 +71,15 @@ class GUI_EXPORT QgsMapOverviewCanvas : public QWidget
 
   protected:
 
+    //! used for overview canvas to reflect changed extent in main map canvas
+    void drawExtentRect();
+
+    //! Should be called when the canvas destination CRS is changed
+    void destinationCrsChanged();
+
+    //! Called when the canvas transform context is changed
+    void transformContextChanged();
+
     //! Overridden paint event
     void paintEvent( QPaintEvent *pe ) override;