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Normal Topic KeyBoard navigation on specific nodes (Read 4280 times)
priyanka
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KeyBoard navigation on specific nodes
Oct 20th, 2009 at 9:42am
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Hi,

I need to navigate on the nodes of the diagram using keyboard arrow keys.

But also I need to move the focus only on a specific set of nodes in diagram not on all the nodes.

How could I do this.??
  
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Stoyo
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Re: KeyBoard navigation on specific nodes
Reply #1 - Oct 20th, 2009 at 12:27pm
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Hi,

Are you using the built-in arrow keys navigation? If it's close enough to what you need, but you’d like to filter out some items, we could add a validation event to allow that. Otherwise you can add your own command bindings to the arrow keys.

Stoyan
  
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priyanka
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Re: KeyBoard navigation on specific nodes
Reply #2 - Oct 20th, 2009 at 12:31pm
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Hi Stoyo,

Yes I am using the built in arrow keys navigation.

Actually I have two parent node and I need to navigate within the child nodes of those parent nodes only but in a specific pattern.

So could you please guide me on how could I get this done.

Priyanka
  
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Stoyo
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Re: KeyBoard navigation on specific nodes
Reply #3 - Oct 20th, 2009 at 1:03pm
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You can override the default navigation like this:

Code
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// in the window constructor/onload
diagram.CommandBindings.Add(new CommandBinding(
	Diagram.NavigateDown, (sender, args) => { MyNavigateDown(); }));

private void MyNavigateDown()
{
	diagram.Selection.Change(...);
}


I hope that helps,
Stoyan
  
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priyanka
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Re: KeyBoard navigation on specific nodes
Reply #4 - Oct 20th, 2009 at 1:23pm
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Hi Stoyo,

Thanks for your quick response.!!!!!

What if i want the nodes to be selected on tab press.??

Priyanka
  
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Stoyo
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Re: KeyBoard navigation on specific nodes
Reply #5 - Oct 20th, 2009 at 3:49pm
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This is the only way I've found doing that without tabbing out of the control:

Code
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diagram.PreviewKeyDown += new KeyEventHandler(diagram_PreviewKeyDown);

void diagram_PreviewKeyDown(object sender, KeyEventArgs e)
{
	if (e.Key == Key.Tab)
	{
		MyNavigateDown();
		e.Handled = true;
	}
}


I hope that helps,
Stoyan
  
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priyanka
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Re: KeyBoard navigation on specific nodes
Reply #6 - Nov 2nd, 2009 at 7:22am
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Hi,

By overridding the default implemetation for Diagram.NavigateDown I am able to provide the custom implementation for Navigating the nodes.

But the diagram_NodeModified event is fired every time the node is moved.

Due to this I am only able to move the node at one step down and validation for the position of node is made(at NodeModified).
And if validation fails I am not able to move it further down

But I want the Modified event to be Raised only when I Release the Down arrow key(On Key up of down arrow key) and the validate the position of Node at that point.

How could I restrict the ModeModified event to be called on every move of the node.

Thanks,
Priyanka
  
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Stoyo
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Re: KeyBoard navigation on specific nodes
Reply #7 - Nov 2nd, 2009 at 12:48pm
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Are you moving the node by calling SetRect(Rect, true) to raise the NodeModified event?

Stoyan
  
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priyanka
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Re: KeyBoard navigation on specific nodes
Reply #8 - Nov 2nd, 2009 at 12:59pm
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No I am not using the SetRect() to move the node.

I am using the node.Move() to move the node to a different location.

And after the MyNavigateDown() gets completed the diagram_NodeModified() event is called.

I want it diagram_NodeModified() to be called only when I am finish with moving to the node to any specific location ie. when the user released the down arrow key,and not after every move of the node.

Priyanka
  
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Stoyo
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Re: KeyBoard navigation on specific nodes
Reply #9 - Nov 2nd, 2009 at 1:26pm
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node.Move() does not raise this event - I suppose you are calling the handler method after each Move? You might add a bool parameter to MyNavigateDown() and call the Modified handler only if the argument is set to true. Then handle both KeyDown and KeyUp events, call MyNavigateDown(false) from the down handler, and MyNavigateDown(true) from the up handler. KeyUp should not be raised while KeyDown repeats because the arrow key is held down, so you will get NodeModified called only once.

Stoyan
  
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