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How to act on presentation out of non-Display Thread [message #37274]

Fri, 12 December 2008 11:57

Christoph HÃ¶ger

Messages: 40
Registered: July 2009

Member

Hello,

I am still working on
http://www.eclipse.org/newsportal/article.php?id=770&gro up=eclipse.platform.pde#770

I've found that jdt uses SourceViewer.changePresentation() on every
(AST-)reconcile event. I tried that, but it of course does not work
because the reconciling occurs in a non-display thread.
I'm aware of Display.getCurrent().asyncExec() which solves the problem
from the other side (being in a Display Thread and wanting to compute
something in the background), Is there a way like
Display.getSomeDisplay().asyncExec()? Or do I have to save the Display on
my own somewhere and reuse it? Or should I setup a Display thread to
handle the redraw event from reconciling (and sleep the rest of the time)?

Any advice welcome

Christoph

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Re: How to act on presentation out of non-Display Thread [message #37342 is a reply to message #37274]

Fri, 12 December 2008 14:31

Eclipse User

Originally posted by: eclipse-news.rizzoweb.com

On 12/12/2008 6:57 AM, Christoph Höger wrote:
> Hello,
>
> I am still working on
> http://www.eclipse.org/newsportal/article.php?id=770&gro up=eclipse.platform.pde#770
>
>
> I've found that jdt uses SourceViewer.changePresentation() on every
> (AST-)reconcile event. I tried that, but it of course does not work
> because the reconciling occurs in a non-display thread.
> I'm aware of Display.getCurrent().asyncExec() which solves the problem
> from the other side (being in a Display Thread and wanting to compute
> something in the background), Is there a way like
> Display.getSomeDisplay().asyncExec()? Or do I have to save the Display
> on my own somewhere and reuse it?

You can get the Display from any widget that you have a reference to by
calling getDisplay().

You can also call PlatformUI.getWorkbench().getDisplay().

Hope this helps,
Eric

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Re: How to act on presentation out of non-Display Thread [message #587056 is a reply to message #37274]

Fri, 12 December 2008 14:31

Eric Rizzo

Messages: 3070
Registered: July 2009

Senior Member

On 12/12/2008 6:57 AM, Christoph Höger wrote:
> Hello,
>
> I am still working on
> http://www.eclipse.org/newsportal/article.php?id=770&gro up=eclipse.platform.pde#770
>
>
> I've found that jdt uses SourceViewer.changePresentation() on every
> (AST-)reconcile event. I tried that, but it of course does not work
> because the reconciling occurs in a non-display thread.
> I'm aware of Display.getCurrent().asyncExec() which solves the problem
> from the other side (being in a Display Thread and wanting to compute
> something in the background), Is there a way like
> Display.getSomeDisplay().asyncExec()? Or do I have to save the Display
> on my own somewhere and reuse it?

You can get the Display from any widget that you have a reference to by
calling getDisplay().

You can also call PlatformUI.getWorkbench().getDisplay().

Hope this helps,
Eric

Report message to a moderator

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