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Normal Topic drop wire to delete it (Read 2315 times)
ChangMH
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drop wire to delete it
Jul 5th, 2014 at 12:35pm
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My requirement is to delete wire by moving its end away from node and dropping it. If I do that now the wire returns to where it was. Thanks for any advice.
  
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Stoyo
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Re: drop wire to delete it
Reply #1 - Jul 7th, 2014 at 5:31am
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You could set AllowUnconnectedLinks = true to let users drag the link end to an empty location of the diagram, and then delete the link from LinkModified handler when it isn't connected to a node:

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private void OnLinkModified(object sender, LinkEventArgs e)
{
	if (!e.Link.IsConnected)
		diagram.Links.Remove(e.Link);
}


I hope that helps,
Stoyan
  
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ChangMH
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Re: drop wire to delete it
Reply #2 - Jul 9th, 2014 at 6:41am
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It works. Is it possible to remove e.Link only if its end is 20 pixels or more away from node, and it stays connected if it is close than 20 pixels?
  
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Stoyo
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Re: drop wire to delete it
Reply #3 - Jul 9th, 2014 at 1:48pm
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Add a LinkModifying handler and set e.Cancel = true if you detect the mouse pointer is still close to the node:

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private void OnLinkModifying(object sender, LinkValidationEventArgs e)
{
	if (e.AdjustmentHandle == 0)
	{
		var dist = Utilities.Distance(
			e.MousePosition,
			e.Link.Origin.GetNearestBorderPoint(e.MousePosition));
		if (dist < 20)
			e.Cancel = true;
	}
	if (e.AdjustmentHandle == e.Link.ControlPoints.Count - 1)
	{
		var dist = Utilities.Distance(
			e.MousePosition,
			e.Link.Destination.GetNearestBorderPoint(e.MousePosition));
		if (dist < 20)
			e.Cancel = true;
	}
}


I hope that helps,
Stoyan
  
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