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Buttons in TreeEditor twinkle on item expand/collapse [message #646880]

Sun, 02 January 2011 02:27

No real name

Messages: 8
Registered: January 2011

Junior Member

Hi,

I managed to build a tree with check box on some items but not all (and many columns).
I use virtual tree, tree editor for SWT.CHECK buttons, and EraseItem listener on the tree, to make my buttons background follows the tree items background on selection...

it works fine, but there still a little artefact I can't figure to avoid. When I collapse or expand an item in my tree, the button in the item and in items above twinkle, they are erased then redrawn. Any idea on how I can avoid this ?
I think I could find a way to intercept buttons erasing, then I'll be able to select which one to erase or not, but I am not familiar with swt.

[Updated on: Sun, 02 January 2011 02:30]

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Re: Buttons in TreeEditor twinkle on item expand/collapse [message #647518 is a reply to message #646880]

Thu, 06 January 2011 18:28

No real name

Messages: 8
Registered: January 2011

Junior Member

No idea ? It is the lastest big artefact I have. If I have a solution I may post a snippet for creating this kind of tree, as I saw it is a features often asked.
But I suppose it is not easy to fix else this snippet would already be available ^^

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Re: Buttons in TreeEditor twinkle on item expand/collapse [message #647639 is a reply to message #647518]

Fri, 07 January 2011 14:33

Lakshmi P Shanmugam

Messages: 277
Registered: July 2009
Location: India

Senior Member

Hi,

I could reproduce this behavior. The problem is that all the editors listen to the Tree Expand and Collapse events and are redrawn on every item expand/collapse.
I have opened a bug for this under SWT --> https://bugs.eclipse.org/bugs/show_bug.cgi?id=333748

Lakshmi P Shanmugam

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Re: Buttons in TreeEditor twinkle on item expand/collapse [message #647680 is a reply to message #646880]

Fri, 07 January 2011 18:06

No real name

Messages: 8
Registered: January 2011

Junior Member

I didn't thought it was a bug, so thanks you.
I tried on winXP and OSX and both are affected.

Do you know if I can simply remove these listener on editors ? Then I'll be able to manage them my self.
Hmmm... seems that we can't manage listener of these object...

[Updated on: Fri, 07 January 2011 18:12]

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