Hi Stoyo

I have a container node and child nodes added in it.

By keepting constranins I cannot move child nodes outside the container node.

But at the same time, i need to prevent sizing of container node such that its child item should not be visible outside.

For that I am trying to do something in following event but not giving expected results ...

void diagram_NodeModifying(object sender, NodeValidationEventArgs e)
{
if (e.Node is ContainerNode)
{
ContainerNode con = e.Node as ContainerNode;
Rect r = new Rect(0, 0, 0, 0);
bool first = true;
foreach (DiagramNode item in con.Children)
{
if (first)
r = item.Bounds;
else
r.Union(item.Bounds);
first = false;
}
Rect outerRect = e.Node.Bounds;

if (!((r.Left > outerRect.Left) && (r.Top > outerRect.Top) && (r.Width < outerRect.Width) && (r.Height < outerRect.Height)))
e.Cancel = true; //();// = true;
System.Console.Write("TesT");
}
}
 

With above code, the node gets resized to its previous state when mouse button was down ... I need to stop it resizing once above condition matches even mouse movement is there ...

I guess it needs to be done in behaviour.
Can you help me in it with some code snipet.

-Rajesh

Hi Rajesh,

Try this:

protected override void UpdateDrag(InteractionState ist)
{
	base.UpdateDrag(ist);

	var r = Bounds;
	foreach (DiagramNode node in Children)
		r.Union(node.Bounds);

	SetBounds(r, false);
} 

I hope that helps,
Stoyan

Hi Rajesh,

Add some checks for the AdjustmentHandle value of InteractionState and do not change the coordinates of the opposing side. E.g. if AdjustmentHandle is any of ResizeTop* values, keep r.Bottom to the node's original Bottom coordinate.

Stoyan