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francisco.leonardo
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How can I navigate through nodes
Mar 26th, 2008 at 12:53pm
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I need navigate through the diagram nodes using the directional keys from keyboard (up, down, left, right). How can I do this?

Thanks,
Francisco
  
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Stoyo
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Re: How can I navigate through nodes
Reply #1 - Mar 26th, 2008 at 1:08pm
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You will have to inherit from the DiagramView class and override its IsInputKey method:

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protected override bool IsInputKey(keys keyData)
{
	switch (keyData)
	{
		case keys.Up:
		case keys.Down:
		case keys.Left:
		case keys.Right:
			return true;
		default:
			return base.IsInputKey(keyData);
	}
}


Then you will receive DiagramView.KeyDown events and can navigate through the nodes according to the pressed key.

Stoyan
  
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francisco.leonardo
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Re: How can I navigate through nodes
Reply #2 - Mar 27th, 2008 at 7:49pm
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I'm using the DiagramView KeyUp event to call the appropriate method depending on the key. For example, if I press and release the UP key I'm calling a OnDirectionalUpKey() method. In this method I need to select the nearest node above the current node. There is any easy way to tho this? Or I will need to implement an algorithm to increment X and Y coords and call the GetNodeAt(x,y) method?
  
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Stoyo
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Re: How can I navigate through nodes
Reply #3 - Mar 28th, 2008 at 10:35am
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Hi,

https://mindfusion.eu/_temp/fcnet504.zip

We've added a Diagram.Navigate(PointF directionVector) method for you. It looks for the nearest item in the specified direction from the ActiveItem, and selects it. You could use it like this

PointF right = new PointF(1, 0);
diagram.Navigate(right);

I hope that helps,
Stoyan
  
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francisco.leonardo
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Re: How can I navigate through nodes
Reply #4 - Mar 28th, 2008 at 7:17pm
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Stoyo,

Thanks for the example. It works, but I had to do some workarounds because the navigation wasn't uniform. Sometimes the diagram.Navigate() method isn't activating any item so the diagram.ActiveItem property is returning NULL.

Although, this files that you sent me are trial. I have a license of the version 5.0.3. How can I proceed to have the same non trial files?
  
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Stoyo
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Re: How can I navigate through nodes
Reply #5 - Mar 28th, 2008 at 7:44pm
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So what part of the navigation isn't uniform? - we would like to improve it. I will send you a PM with a link to the full version, if you've registered on the forum with the same email you used when purchased the license. Otherwise - please e-mail me from that address.

Thanks,
Stoyan
  
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