Implement ListenToMessage and trap the message from the IconCache to call a pure virtual. Means subclasses don't have to override ListenToMessage.

cmd/macfe/central/CImageIconMixin.cp

@@ -52,6 +52,20 @@ CImageIconMixin :: ~CImageIconMixin ( )
 }
 
 
+//
+// ListenToMessage
+//
+// Listen for the update of image and then 
+//
+void
+CImageIconMixin :: ListenToMessage ( const MessageT inMessage, void* ioData )
+{
+	if ( inMessage == CIconContext::msg_ImageReadyToDraw )
+		ImageIsReady();
+		
+} // ListenToMessage
+
+
 //
 // DrawIcon
 //	

cmd/macfe/central/CImageIconMixin.h

@@ -37,7 +37,7 @@
 //
 // class CImageIconMixin
 //
-// Draw an image, most likely as an icon
+// Draw an image, most likely as an icon.
 //
 class CImageIconMixin : public LListener
 {
@@ -59,6 +59,13 @@ public:
 	
 protected:
 
+		// catch the message that the image is ready to draw
+	virtual void ListenToMessage ( MessageT inMessage, void* ioPtr ) ;
+	
+		// called when the image is ready to draw. This should do something like
+		// refresh the view.
+	virtual void ImageIsReady ( ) = 0;
+	
 		// Draw a scaled image as an icon. Override to draw differently
 	virtual void DoDrawing ( DrawingState & inState, const Point & inTopLeft,
 								const IconTransformType inTransform, Uint32 inWidth,