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Dragging out of Diagram .. which event handlers can detect it dynamically? (Read 3027 times)

ulthien Junior Member Offline I love YaBB 1G - SP1! Posts: 91 Location: Munich Joined: Nov 29^th, 2011	Dragging out of Diagram .. which event handlers can detect it dynamically? Mar 1^st, 2013 at 10:57am	Print Post
	Hi, when dragging in WPF the event handlers that would detect that diagram is left or entered, dragover etc are not receiving events until the drag is over aka mouse button is released. This interferes with e.g. behaviour that the diagram we drag from keeps on scrolling (AutoResize) until the mouse is released, when the system determines "oh its ways outside the diagram" and stops scrolling. What would be the way to note that mouse position is no more within the diagram WHILE dragging? How to get the real-time feedback? thx


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Dragging out of Diagram .. which event handlers can detect it dynamically? Reply #1 - Mar 1^st, 2013 at 1:41pm	Print Post
	I suppose the system does not raise enter/leave events for controls that hold the mouse capture. You could check if the mouse is still inside the control from a MouseMove handler instead: Code void diagram_PreviewMouseMove(object sender, MouseEventArgs e) { var p = e.GetPosition(scrollViewer); var r = new Rect(0, 0, scrollViewer.ActualWidth, scrollViewer.ActualHeight); if (!r.Contains(p)) Debug.WriteLine("out"); } I hope that helps, Stoyan


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ulthien Junior Member Offline I love YaBB 1G - SP1! Posts: 91 Location: Munich Joined: Nov 29^th, 2011	Re: Dragging out of Diagram .. which event handlers can detect it dynamically? Reply #2 - Mar 1^st, 2013 at 2:49pm	Print Post
	nice but how do you stop AutoResizing on this event? i just tried AutoResize = AutoResize.None; but it seems to continue scrolling. Maybe i should arrest the scrollviewer?


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ulthien Junior Member Offline I love YaBB 1G - SP1! Posts: 91 Location: Munich Joined: Nov 29^th, 2011	Re: Dragging out of Diagram .. which event handlers can detect it dynamically? Reply #3 - Mar 1^st, 2013 at 2:53pm	Print Post
	i mean, it seems to have some leeway before scollviewer end is reached, sort of margin.


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Dragging out of Diagram .. which event handlers can detect it dynamically? Reply #4 - Mar 1^st, 2013 at 3:17pm	Print Post
	Is it auto-scrolling or auto-resizing at that point? - perhaps you should set the AutoScroll property to false... I'm not sure what you are trying to do - why not just keep these properties disabled, or do you need some sort of selective auto-scroll and auto-resize?


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ulthien Junior Member Offline I love YaBB 1G - SP1! Posts: 91 Location: Munich Joined: Nov 29^th, 2011	Re: Dragging out of Diagram .. which event handlers can detect it dynamically? Reply #5 - Mar 1^st, 2013 at 3:36pm	Print Post
	I'll play a bit with it, does not look that bad as before thx Stoyo


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