Re: [e4-dev] Does that mean SWT only exist in desktop ?

[Tom Schindl <tom.schindl@xxxxxxxxxxxxxxx>]

Am 06.02.10 00:33, schrieb yves.yang@xxxxxxxxxxx:
>> On Thu, Jan 28, 2010 at 2:16 PM, Tom Schindl
>> <tom.schindl@xxxxxxxxxxxxxxx>wrote:
>>
>>> Hi,
>>>
>>> Doing a full SWT-Port for the Web is a very hard task because some of
>>> the concepts in SWT can't be emulated easily on the browser:
>>>
>>> * Event-Loop: Todays browser though HTML5 brings webworkers are still
>>>  single threaded and so you can't e.g open blocking dialogs like you
>>>  do in SWT => SWT would have to introduce API with callbacks so
>>>  that one could write single-source code.
>>>
>>>  An example might make this clear:
>>>
>>>  Today:
>>>  ----------8<----------
>>>  MessageBox msg = new MessageBox(parent,SWT.ICON_ERROR);
>>>  msg.setText("I'm the message");
>>>  msg.open();  // Blocking call
>>>  System.out.println("I'm running after dialog closed");
>>>  ----------8<----------
>>>
>>>  In Future:
>>>  ----------8<----------
>>>  MessageBox msg = new MessageBox(parent,SWT.ICON_ERROR);
>>>  msg.setText("I'm the message");
>>>  msg.open(new Runnable() {
>>>    public void run() {
>>>      System.out.println("I'm running after dialog closed");
>>>    }
>>>  });
> 
> It is exactly one of benefice of using XWT: physical separation between
> event handling and UI. XWT can manage the both cases transparently. We can
> define the event handling policy (sync, async and delayed async) between
> declarative UI and event handling based on Java Handling, Bundle service,
> web service etc.
> 

Sorry I don't see events here? If SWT would have an API to handle button
clicks this would be true but SWT (as well as JFace) works here with
return values and blocking methods. So I don't get how XWT could help me
in this case.

How would you code this in XWT? Please note I talked about different
API-Concepts not about listeners who work the same in Browsers and
Desktop-Environments.

Tom

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