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Normal Topic Detect multiselect types (Read 2246 times)
JHanson
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Detect multiselect types
May 29th, 2015 at 8:07pm
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I need to distinguish between when a user selects multiple nodes by dragging a rectangle around them with the mouse and when they select multiple nodes individually by using the CTRL key and clicking.
  
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Stoyo
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Re: Detect multiselect types
Reply #1 - Jun 1st, 2015 at 7:53am
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Inside NodeSelecting validation event handler you could detect that by comparing e.SelectionRectangle with RectangleF.Empty. An empty rectangle means CTRL-click selection.

Alternatively, for both Selecting and Selected events you could inspect the Diagram.Interaction object:

Code
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private void diagram_NodeSelected(object sender, NodeEventArgs e)
{
	if (diagram.Interaction != null &&
		diagram.Interaction.CurrentItem is Selection)
	{
		Debug.WriteLine("lasso selection");
	}
	else
	{
		Debug.WriteLine("click selection");
	}
}


I hope that helps,
Stoyan
  
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JHanson
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Re: Detect multiselect types
Reply #2 - Jun 1st, 2015 at 2:18pm
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Excellent, thank you!
  
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