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SWT Treeviewer - Scrollbar does not disappear when collapsing the tree [message #1409460]

Mon, 18 August 2014 06:57

Coco Li

Messages: 1
Registered: August 2014

Junior Member

Hi all,
I am using a org.eclipse.jface.viewers.TreeViewer. In it's initial state (when starting the application) no scrollbars are visible as no nodes are expanded.
When I expand the tree the vertical scrollbar and the horizontal scrollbar appear which is the desired behavior.
But when I collapse all only the vertical scrollbar disappears - the horizontal scrollbar is still visible.
I checked the result of getTree().computeSize(SWT.DEFAULT, SWT.DEFAULT). At startup the result is different from (smaller than) the result after expand all followed by collapse all. I think this is the reason why the scrollbar is still displayed.

I found out that "setInput(getInput())" helps but calling that after each collapse-event is rather a bad solution.

Is there any way to reset the preferred size of the tree after a collapse event so that the scrollbar disappears (or adjustes it's size to what is visible in the tree)?

I have browsed through several forums and the eclipse bug-reports. This scrollbar-issue was often discussed but I never found a solution which I could integrate into my application.

Thank you in advande for your help.

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