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JFace ControlDecoration not consistent. [message #909378]

Fri, 07 September 2012 03:49

Chris Fairhall

Messages: 221
Registered: February 2011

Senior Member

I'm using a JFace ControlDecoration in a single sourced RWT/SWT standalone application.

When disposing of old ControlDecoration if I call #dispose without first calling #hide, under SWT I get left with remnants of the image on the screen. No update gets called before the ControlDecoration is disposed.
That's fine, I can just call #hide first.

When doing this in RWT, #hide throws a [org.eclipse.swt.SWTException: Widget is disposed] if the ControlDecoration is already disposed. SWT can never throw this exception when calling the #hide method.

I think it would be good for RWT to check if its internal implementation is already disposed and not throw an exception, since there is no #isDisposed API.

ps: not urgent as I've fixed the cause of the duplicate calls to hide/dispose in my code

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Re: JFace ControlDecoration not consistent. [message #909439 is a reply to message #909378]

Fri, 07 September 2012 06:29

Ivan Furnadjiev

Messages: 2429
Registered: July 2009
Location: Sofia, Bulgaria

Senior Member

Chris,
if the ControlDecoration behaves differently from RCP please open a
bugzilla about this issue.
Thanks,
Ivan

On 9/7/2012 6:49 AM, Chris Fairhall wrote:
> I'm using a JFace ControlDecoration in a single sourced RWT/SWT
> standalone application.
>
> When disposing of old ControlDecoration if I call #dispose without
> first calling #hide, under SWT I get left with remnants of the image
> on the screen. No update gets called before the ControlDecoration is
> disposed.
> That's fine, I can just call #hide first.
>
> When doing this in RWT, #hide throws a [org.eclipse.swt.SWTException:
> Widget is disposed] if the ControlDecoration is already disposed. SWT
> can never throw this exception when calling the #hide method.
>
> I think it would be good for RWT to check if its internal
> implementation is already disposed and not throw an exception, since
> there is no #isDisposed API.
>
>
> ps: not urgent as I've fixed the cause of the duplicate calls to
> hide/dispose in my code

--
Ivan Furnadjiev

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