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Re: how to have empty nod

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  To: comp.lang.java.gui
Edwin Dankert wrote:
>> Well since I'm only grabbing a node's children when the node is selected
>> or expanded the JTree probably is using the isLeaf method from the
>> TreeModel to not draw an expansion control next to the node because at
>> that point until the node's children are retrieved it is a leaf node
>> which is why I have to put in a fake node so that it isn't a leaf node
>> any longer. Then I have to go to the trouble of deleting the node and
>> still make the application behave properly. Deleting it is easy but in
>> my OP I stated the trouble I ran into when I attempted that.
> 
> Sun, has provided all the functionality to implement this relatively
> simply, I think however that the route you have chosen might not be
> the most effective one.
> 
> Most Swing components are controlled by their models so, I would
> suggest you try and implement the TreeModel or implement the TreeNode
> (which is often the easier route) or a combination of both, this would

My custom node already extends DefaultMutableTreeNode and I'm using the 
DefaultTreeModel for the tree itself.

> allow you to return false for the isLeaf() method. I would also
> recommend to implement a TreeWillExpandListener to perform the look-up
> of the child TreeNodes before the tree is expanded.

I'll try that since Rogan also suggested that. Hopefully that will solve 
the problem.

> 
> Regards,
> Edwin
> --
> http://www.edankert.com/
>

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how to have empty nodes i "Brandon McCombs" <brandon.mccombs@THRWHITE.remove-dii-this> - 2011-04-27 15:29 +0000
  Re: how to have empty nod "Michael Rauscher" <michael.rauscher@THRWHITE.remove-dii-this> - 2011-04-27 15:29 +0000
    Re: how to have empty nod "Brandon McCombs" <brandon.mccombs@THRWHITE.remove-dii-this> - 2011-04-27 15:29 +0000
      Re: how to have empty nod "Edwin Dankert" <edwin.dankert@THRWHITE.remove-dii-this> - 2011-04-27 15:30 +0000
        Re: how to have empty nod "Brandon McCombs" <brandon.mccombs@THRWHITE.remove-dii-this> - 2011-04-27 15:30 +0000
    Re: how to have empty nod "Rogan Dawes" <rogan.dawes@THRWHITE.remove-dii-this> - 2011-04-27 15:30 +0000

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