I feel like I'm not expressing myself clearly. Let's just focus on the
reduced case:
import org.eclipse.swt.widgets.Canvas;
public class foo {
}
Right now, if I try to run this through GWT, it will throw an error
because it can't compile Canvas and all of its dependencies. This is
to be expected. So what I would like is to roll my own Canvas class
which extends GWT's Widget class, and have that be used instead, but
in such a way that I don't have to touch the existing program's source
code.
Ian, you seem to be suggesting that I need to hack this into the
internals of GWT itself, and try to push it upstream. I feel like
there should be a way to do this without having modify GWT internals,
because this would allow certain applications (not all of them) that
leverage native GUI toolkits to be compiled directly to a browser-
based version, without having to port them to a GWT-friendly set of
libraries. This would be a very powerful feature, but it may not
exist. If I could just get confirmation on this, I would appreciate
it.
Thanks,
Jake
On Apr 7, 2:38 pm, Ian Bambury <[email protected]> wrote:
> GWT isn't Java. It just uses Java syntax so that Java books are useful, and
> things like Eclipse work for it.
> GWT code becomes JavaScript. It is never at any point Java.
>
> A very simple compiler might recognise '"Window.alert(" and translate it to
> '"document.alert("
>
> If you whole program consists of Window.alert("Hello"); then it will be OK.
> Anything else will fail.
>
> The Google team have emulated many other commands and structures, but not
> all of them: some are obscure and therefore not high enough up the priority
> list, and some are impossible because, like threading, JS just doesn't do
> that.
>
> It would be an impossible task to emulate every possible class in every Java
> library in existence. And would take for ever.
>
> So if it ain't emulated, it ain't gonna work because the compiler will issue
> a polite and rather technical version of 'WTF?'
>
> And just throwing any old java program into the GWT compiler is, pretty
> much, pointless.
>
> But if you really want to help Google and emulate
> rg.eclipse.swt.widgets.Canvas
> for GWT, then I'm sure they (and many others) will be eternally grateful for
> at least a week or two :-)
>
> If so, troll your little old lallies over to the very
> bonahttp://groups.google.com/group/Google-Web-Toolkit-Contributors
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