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Resize tree on collapsing and expanding [message #1748340]

Tue, 22 November 2016 11:04

Michiel Werk

Messages: 3
Registered: July 2009

Junior Member

Hi,

I like to resize the tree when the tree collapses and expands so that it only takes up the space that it needs. For this I am using this piece of code:

	tree.addTreeListener(new TreeListener()
	{
		@Override
		public void treeExpanded(TreeEvent e)
		{
			tree.getParent().pack();
		}

		@Override
		public void treeCollapsed(TreeEvent e)
		{
			tree.getParent().pack();
		}
	});

However, the events are to early to call pack on the parent and no resize is done. When calling pack just a little bit later works perfectly. Is there anybody that does know how to solve this?

Thanks, Michiel

[Updated on: Tue, 22 November 2016 11:24]

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Re: Resize tree on collapsing and expanding [message #1748421 is a reply to message #1748340]

Wed, 23 November 2016 00:47

Brian de Alwis

Messages: 877
Registered: January 2012

Senior Member

You can use asyncExec() to submit a task to run in the UI event queue:

tree.getDisplay().asyncExec(new Runnable() {
   public void run() {
      tree.getParent().pack();
   }});

That's usually sufficient.

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Re: Resize tree on collapsing and expanding [message #1748451 is a reply to message #1748421]

Wed, 23 November 2016 09:46

Michiel Werk

Messages: 3
Registered: July 2009

Junior Member

Thanks Brian! This solves the issue.

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