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Normal Topic DiagramNode DragOver indicator (Read 2210 times)
Sim
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DiagramNode DragOver indicator
Dec 30th, 2014 at 1:36pm
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Is it possible to check if a DraggramNode is currently dragged over? I would like to check if a ContainerNode object is currently highlighted. I have fixed this by overriding the OnDragOver and OnDragOut and using a property:

Code (C++)
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public override bool OnDragOver(DiagramItem item)
{
    this.IsHighlighted = base.OnDragOver(item);
    return this.IsHighlighted;
}

public override void OnDragOut(DiagramItem item)
{
    this.IsHighlighted = false;
    base.OnDragOut(item);
}


Would it be possible to check if a DiagramNode is currently dragged over without using the code above?
  
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Stoyo
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Re: DiagramNode DragOver indicator
Reply #1 - Dec 30th, 2014 at 2:19pm
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You could call GetNodeAt while the mouse moves, e.g.

Code
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private void diagramView_MouseMove(object sender, MouseEventArgs e)
{
	if (diagram.Interaction != null)
	{
		var nodeBehind = diagram.GetNodeAt(
			diagram.Interaction.CurrentPoint, false, true);
		if (nodeBehind != null)
		{
			nodeBehind.Brush = new SolidBrush(Color.Red);
			diagramView.RecreateCacheImage();
		}
	}
}


I hope that helps,
Stoyan
  
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Sim
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Re: DiagramNode DragOver indicator
Reply #2 - Dec 30th, 2014 at 3:01pm
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Thank you for your response. Would it be possible to check if the OnDragOver method has been called without resorting to using event handlers/the mouse position?
  
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Stoyo
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Re: DiagramNode DragOver indicator
Reply #3 - Dec 30th, 2014 at 4:10pm
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It's not possible via public API at this time. If you have the source code, you could add your checks to the DiagramView.OnDragOverNode method.
  
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