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VT22
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Dragging nodes with right mouse button
Jul 16th, 2010 at 12:49pm
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Hi!

Is it possible to drag diagram nodes with right mouse? I'd like to use the control with two mouse buttons: left for creating nodes and links, right for moving nodes /and also forget node selections/.

I've tried to create a custom behavior, but the StartDraw is not called on pressing RMB.
  
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Stoyo
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Re: Dragging nodes with right mouse button
Reply #1 - Jul 16th, 2010 at 1:05pm
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Hi,

Unfortunately StartDraw is called only when using the left button. You might try overriding behavior.OnMouseMove instead, and if the right-button flag in Control.MouseButtons is enabled, set Diagram.Interaction to an InteractionState you would otherwise return from StartDraw:

if (Diagram.Interaction == null && (Control.MouseButtons & MouseButtons.Right) != 0)
     Diagram.Interaction = new InteractionState(...);

or call the base OnMouseMove implementation if the RMB flag is not set.

I hope that helps,
Stoyan
  
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VT22
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Re: Dragging nodes with right mouse button
Reply #2 - Jul 16th, 2010 at 2:04pm
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It does not work. When I tried to move a node with RMB it was not drawn (although the cursor remained cross), and when I released the button the base threw an ArgumentNullException (on "Parameter name: image" - ???)

protected override void OnMouseMove(Point mousePosition)
{
if (Diagram.Interaction == null && ((Control.MouseButtons & MouseButtons.Right) != 0))
{
PointF point = DiagramView.ClientToDoc(mousePosition);
DiagramNode node = Diagram.GetNodeAt(point);
if (node != null)
{
Diagram.Interaction = new InteractionState(node, 8, Action.Modify);
}
}
else
{
//Diagram.Interaction = null; //with this line no exception, but no moving too
base.OnMouseMove(mousePosition);
}
}
  
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Stoyo
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Re: Dragging nodes with right mouse button
Reply #3 - Jul 16th, 2010 at 3:15pm
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Ok, the base class expects some back-buffer image to be created at that point and it won't be easy to create it without the reflection API. Our developer will add a MouseButtonActions member you could assign to RightButtonAction to let you override StartDraw in that case. For now you might use the shift or control keys to start the alternative action.

Stoyan
  
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Re: Dragging nodes with right mouse button
Reply #4 - Jul 19th, 2010 at 9:05am
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Thank you in advance. When will be the fix released?
  
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Re: Dragging nodes with right mouse button
Reply #5 - Jul 19th, 2010 at 11:05am
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This build adds a Draw member to the MouseButtonActions enum:
https://mindfusion.eu/_beta/fcnet54_rmb.zip

Now you can set DiagramView.RightButtonActions = Draw, and the control will also call behavior.StartDraw when the right button is down. Then you could override it like this:

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public override InteractionState StartDraw(PointF point)
{
	if ((Control.MouseButtons & MouseButtons.Right) != 0)
	{
		DiagramNode node = Diagram.GetNodeAt(point);
		if (node != null)
			return new InteractionState(node, 8, Action.Modify);
	}

	return base.StartDraw(point);
}


I hope that helps,
Stoyan
  
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