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Normal Topic Need Drag and Drop on nodes (Read 1145 times)
Anshul
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Need Drag and Drop on nodes
Dec 3rd, 2009 at 9:03am
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Hi Stoyan,

In one of our requirement we want behavior of link creation but we don't want to create a link i.e. if user start dragging from one node to another node, we want source node and destination node information on stop of dragging but we don’t want to create a link on it, instead it should show the path of dragging so that user can understand for which nodes operation will get perform. To do this we are thinking for DrawLinks behavior because by this we can get source and destination node information.

Is there any other way to do this drag and drop operation from one node to another such that it will give some impression to user that some operation is going on?
OR
Can we show a different style of link when it is in creating state i.e. just after setting DrawLinks behavior without modifying standard style of created links?

Please suggest.


Regards,
Anshul
  
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Stoyo
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Re: Need Drag and Drop on nodes
Reply #1 - Dec 3rd, 2009 at 11:42am
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Hi,

You could change the link appearance from the InitializeLink handler:

Code
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private void diagram_InitializeLink(object sender, LinkEventArgs e)
{
	if (diagram.Behavior == Behavior.DrawLinks)
	{
		// show path mode
		e.Link.Pen.DashStyle = DashStyles.Dash;
		e.Link.Pen.Brush = new SolidColorBrush(Color.FromArgb(50, 50, 50, 50));
		e.Link.HeadShape = ArrowHead.None;
	}
}

private void diagram_LinkCreating(object sender, LinkValidationEventArgs e)
{
	if (diagram.Behavior == Behavior.DrawLinks)
	{
		// show path mode
		if (Mouse.LeftButton == MouseButtonState.Released)
		{
			e.Cancel = true;
			var dragStarted = e.Origin;
			var dragEnded = e.Destination;
		}
	}
}


I hope that helps,
Stoyan
  
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