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Normal Topic Prevent from adding node to diagram (Read 1409 times)
MUDO
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Prevent from adding node to diagram
May 20th, 2009 at 7:28pm
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Hi.

I add nodes to diagram via
- code (diagram.add)
- drag&drop (from toolbar)
- interactive (InteractionState value from my derived CustomBehavior class)

Before adding I check my conditions (dataset,...) and then I decide to not/add node. So what in situation if I forbid to user to add node? ItemAdded event does not have Cancel property. So? Another event?

Thx.

...MUDO...
  
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Stoyo
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Re: Prevent from adding node to diagram
Reply #1 - May 21st, 2009 at 5:09am
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Hi,

If you validation function returns false:

- do not call diagram.Items.Add
- set e.DragAction = Cancel from the DiagramView.DragOver handler
- return null form the custom behavior StartDraw method

I hope that helps,
Stoyan
  
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MUDO
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Re: Prevent from adding node to diagram
Reply #2 - May 21st, 2009 at 6:44am
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Hi.

Hm, but I perform checking in ItemAdded event. Is there something like ItemAdding where I can cancel operation?

How can I do checking in my custom behavior class? There is not possible to create event and handle it on form...or?

...MUDO...
  
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Stoyo
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Re: Prevent from adding node to diagram
Reply #3 - May 21st, 2009 at 11:11am
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Hi,

There is the NodeCreating event you could use to call your function instead in StartDraw, and call e.CancelDrag() if you want to stop the operation. It won't be raised in the other two cases.

I hope that helps,
Stoyan
  
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