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Normal Topic Unselecting item on selecting (Read 2892 times)
koosala
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Unselecting item on selecting
Jun 1st, 2007 at 3:47am
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Hi,

I wrote the follwing piece of code where I handled the flowchart event itemSelected:

public void itemSelected(ItemEvent ie) {
    ie.getItem().setSelected(false);
}

It had some other code also and some conditions, but I have filtered out the code that caused the problem.

The above line throws an exception:

Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
at com.mindfusion.jdiagram.Selection.removeItem(Unknown Source)
at com.mindfusion.jdiagram.Item.setSelected(Unknown Source)
at app.SAApplet$31.itemSelected(SAApplet.java:782)

I am guessing this is a bug, yes?
  
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Stoyo
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Re: Unselecting item on selecting
Reply #1 - Jun 1st, 2007 at 6:32am
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Hi,

The event is raised before the item is added to a collection, from which setSelected(false) attempts to remove it. I guess we can rearrange a bit the statements in the selection method to make that kind of code work. We will also add an itemSelecting validation event as you suggested in another post.

Stoyan
  
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Stoyo
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Re: Unselecting item on selecting
Reply #2 - Jun 4th, 2007 at 12:40pm
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This version adds an itemSelecting validation event, and should let you deselect items from the Selected event as well.

http://mindfusion.org/_temp/JDiagram.jar

Stoyan
  
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