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UIElement Line and Mouse button click (Read 1711 times)

solisgsandc YaBB Newbies Offline Posts: 40 Joined: Dec 18^th, 2009	UIElement Line and Mouse button click Feb 11^th, 2010 at 5:34pm	Print Post
	When I use the mouse button click on the line, it does not seem to pick it up right away. I have to be right on top of the line which could be very thin. Is there a way to increase the hit distance on this UIElement?


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: UIElement Line and Mouse button click Reply #1 - Feb 11^th, 2010 at 7:29pm	Print Post
	If by line you mean a DiagramLink, try setting a larger LinkHitDistance value. There is no such property for nodes, so if that's a hosted control that contains just one line you might need to modify to control to add some margin around the line.


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solisgsandc YaBB Newbies Offline Posts: 40 Joined: Dec 18^th, 2009	Re: UIElement Line and Mouse button click Reply #2 - Feb 11^th, 2010 at 7:43pm	Print Post
	The Line UIElement is hosted inside a diagramNodeAdapter. Can you please send me some code about how to add some margin?


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: UIElement Line and Mouse button click Reply #3 - Feb 11^th, 2010 at 9:20pm	Print Post
	My idea was to do something like this: Code var line = new Line(); line.Stroke = new SolidColorBrush(Colors.Black); line.X1 = 5; line.Y1 = 10; line.X2 = 55; line.Y2 = 10; line.Width = 60; line.Height = 20; diagram.Nodes.Add(line); but it doesn't work... It seems WPF hit testing is successful only if the mouse pointer is over a painted pixel of the UIElement. Instead, you could handle the Clicked event and use the GetNodeAt(threshold) method to find a nearby line: Code private void OnDiagramClicked(object sender, DiagramEventArgs e) { var node = diagram.GetNodeAt(e.MousePosition, 10) as DiagramNodeAdapter; if (node != null && node.UIElement is Line) diagram.ActiveItem = node; } I hope that helps, Stoyan


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