| Saving and restoring a TreeViewer's expanded state [message #333581] |
Wed, 17 December 2008 21:23 |
 Tomas Pollak
Messages: 4
Registered: July 2009 |
Junior Member |
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Hello, I have the following problem:
I have a view with a TreeViewer that shows some info for an object which
in the business model is called a "session". When the user switches
sessions, I need to redraw the tree, and if the user switches back I need
to show the tree as it was previous to the switch.
In order to solve that, I am using the getExpandedElements() and
setExpandedElements() methods from the TreeViewer, to store the expanded
elements in an array in my model "session" object.
I reasoned that the most natural place to do this is in the inputChanged()
method of the ContentProvider. However when I tried it it had no effect.
Apparently the inputChanged() method is called _before_ actually changing
the input for the viewer. As a workaround I moved this logic to the View
itself, where I can call these methods after the inputChanged() is
completed.
Do you have any idea why this is implemented like this?
Is there a "best practice" for doing this that I'm not aware of?
I would like this responsibility to be in the content provider, because
that would also mean it's easier to test (than if it were in the view).
Thank you.
Tomás
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