applied patch from Juergen to refresh layer legend from plugin

git-svn-id: http://svn.osgeo.org/qgis/trunk@7112 c8812cc2-4d05-0410-92ff-de0c093fc19c

python/gui/qgisinterface.sip

@@ -81,6 +81,9 @@ class QgisInterface : QObject
     /** Return a pointer to the toolbox (where additional pages can be inserted) */
     virtual QToolBox* getToolBox()=0;
 
+    /** refresh legend of a layer */
+    virtual void refreshLegend( QgsMapLayer * layer )=0;
+
   signals:
     /** Emited whenever current (selected) layer changes.
      *  The pointer to layer can be null if no layer is selected

src/app/qgisappinterface.cpp

@@ -140,3 +140,8 @@ QToolBox* QgisAppInterface::getToolBox()
 {
   return qgis->toolBox;
 }
+
+void QgisAppInterface::refreshLegend(QgsMapLayer *l)
+{
+  qgis->legend()->refreshLayerSymbology(l->getLayerID());
+}

src/app/qgisappinterface.h

@@ -104,6 +104,9 @@ class QgisAppInterface : public QgisInterface
         /** Return a pointer to the toolbox (where additional pages can be inserted) */
         virtual QToolBox* getToolBox();
 
+	/** refresh the legend of a layer */
+	virtual void refreshLegend(QgsMapLayer *l);
+
     private:
 
         /// QgisInterface aren't copied

src/gui/qgisinterface.h

@@ -113,6 +113,9 @@ class GUI_EXPORT QgisInterface : public QObject
     /** Return a pointer to the toolbox (where additional pages can be inserted) */
     virtual QToolBox* getToolBox()=0;
 
+    /** refresh the legend of a layer */
+    virtual void refreshLegend(QgsMapLayer *l)=0;
+
   signals:
     /** Emited whenever current (selected) layer changes.
      *  The pointer to layer can be null if no layer is selected

src/gui/qgsmapcanvas.cpp

@@ -1017,6 +1017,8 @@ void QgsMapCanvas::updateMap()
   // XXX updating is not possible since we're already in paint loop
 //  mCanvas->update();
 //  QApplication::processEvents();
+  QPainter p(this);
+  p.drawPixmap(0, 0, mMap->pixmap());
 }