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TreeViewer Collapses on refresh [message #659120]

Fri, 11 March 2011 07:32

Animesh Kumar

Messages: 79
Registered: September 2010
Location: Bangalore

Member

Hi,
I have a FilteredTree which is defined as follows:-

PatternFilter patternFilter = new PatternFilter();
final FilteredTree filteredTree = new FilteredTree(container, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL, patternFilter);
TreeViewer treeViewer = filteredTree.getViewer();

I have an action whose selection or de-selection refreshes the tree. But when the treeviewer is refreshed, the tree gets collapsed. How can I prevent my tree from getting collapsed?

I am using the the following code for treeviewer refresh:-

actionShowObjects = new Action("Show Objects") {

				@Override
				public void run() {
					treeViewer.refresh();
					}

			};
			actionShowObjects.setChecked(true);

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Re: TreeViewer Collapses on refresh [message #659161 is a reply to message #659120]

Fri, 11 March 2011 10:13

Thomas Schindl

Messages: 6253
Registered: July 2009

Senior Member

Your problem is very likely that you are recreating your domain objects
in your content provider and so you need to help the TableViewer to map
the old instance to the new one which is normally done by setting an
IElementComparer on the viewer.

Tom

Am 11.03.11 08:32, schrieb Animesh Kumar:
> Hi,
> I have a FilteredTree which is defined as follows:-
> PatternFilter patternFilter = new PatternFilter();
> final FilteredTree filteredTree = new FilteredTree(container, SWT.MULTI
> | SWT.H_SCROLL | SWT.V_SCROLL, patternFilter);
> TreeViewer treeViewer = filteredTree.getViewer();
>
>
> I have an action whose selection or de-selection refreshes the tree. But
> when the treeviewer is refreshed, the tree gets collapsed. How can I
> prevent my tree from getting collapsed?
>
> I am using the the following code for treeviewer refresh:-
>
> actionShowObjects = new Action("Show Objects") {
>
> @Override
> public void run() {
> treeViewer.refresh();
> }
>
> };
> actionShowObjects.setChecked(true);
>

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Re: TreeViewer Collapses on refresh [message #659163 is a reply to message #659161]

Fri, 11 March 2011 10:30

Animesh Kumar

Messages: 79
Registered: September 2010
Location: Bangalore

Member

Hi Tom,
Thanx for the reply. If you don't mind, can you give a small example on how i can use the IElementComparer for the TreeViewer.

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