Port method for pausing layout view updates

qgis · Dec 17, 2017 · 113664f · 113664f
1 parent 1b8f4a0
commit 113664f
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diff --git a/python/gui/layout/qgslayoutview.sip b/python/gui/layout/qgslayoutview.sip
@@ -265,6 +265,7 @@ Returns the delta (in layout coordinates) by which to move items
 for the given key ``event``.
 %End
 
+
   public slots:
 
     void zoomFull();
@@ -557,6 +558,8 @@ item and should have its properties displayed in any designer windows.
 
     virtual void dragEnterEvent( QDragEnterEvent *e );
 
+    virtual void paintEvent( QPaintEvent *event );
+
 
 };
 

diff --git a/src/gui/layout/qgslayoutview.cpp b/src/gui/layout/qgslayoutview.cpp
@@ -1002,6 +1002,19 @@ void QgsLayoutView::dragEnterEvent( QDragEnterEvent *e )
   e->ignore();
 }
 
+void QgsLayoutView::paintEvent( QPaintEvent *event )
+{
+  if ( mPaintingEnabled )
+  {
+    QGraphicsView::paintEvent( event );
+    event->accept();
+  }
+  else
+  {
+    event->ignore();
+  }
+}
+
 void QgsLayoutView::invalidateCachedRenders()
 {
   if ( !currentLayout() )

diff --git a/src/gui/layout/qgslayoutview.h b/src/gui/layout/qgslayoutview.h
@@ -270,6 +270,13 @@ class GUI_EXPORT QgsLayoutView: public QGraphicsView
      */
     QPointF deltaForKeyEvent( QKeyEvent *event );
 
+    /**
+     * Sets whether widget repainting should be allowed for the view. This is
+     * used to temporarily halt painting while exporting layouts.
+     * \note Not available in Python bindings.
+     */
+    void setPaintingEnabled( bool enabled ) { mPaintingEnabled = enabled; } SIP_SKIP
+
   public slots:
 
     /**
@@ -512,6 +519,7 @@ class GUI_EXPORT QgsLayoutView: public QGraphicsView
     void resizeEvent( QResizeEvent *event ) override;
     void scrollContentsBy( int dx, int dy ) override;
     void dragEnterEvent( QDragEnterEvent *e ) override;
+    void paintEvent( QPaintEvent *event ) override;
 
   private slots:
 
@@ -543,6 +551,8 @@ class GUI_EXPORT QgsLayoutView: public QGraphicsView
 
     QgsPreviewEffect *mPreviewEffect = nullptr;
 
+    bool mPaintingEnabled = true;
+
     friend class TestQgsLayoutView;
     friend class QgsLayoutMouseHandles;