Re: [Xswt-developer] event handlers

[David J. O. <dj...@co...>]

Cool!

Dave Orme

Hallvard Tr=E6tteberg wrote:
>> -----Original Message-----
>> Date: Mon, 19 Jun 2006 22:03:46 -0500
>> From: "David J. Orme" <dj...@co...>
>> Subject: Re: [Xswt-developer] event handlers
>> To: xsw...@li...
>>
>> So it's basically an elegant way to get closures for Java=20
>> code defined in pnuts, right?
>>    =20
>
> Yes, there's two kinds of script-based listeners that may be attached t=
o an
> SWT control:
> 1) When the value (an IDREF) of an xxxListener attribute refers to a sc=
ript
> as a whole, the installed proxy looks up the method name and calls that
> Function, if it exists. This makes it easy to make a script covering al=
l
> methods in an interface.
> 2) When the value (an IDREF) of an xxxListener attribute refers to a
> Function (in a script), the installed proxy calls that Function directl=
y,
> which only makes sense for single-method interfaces or interfaces where=
 the
> arguments are the same for all methods and the arguments contain enough
> information about the event. This is usually the case for GUI event
> handlers, which makes it easy to write a long script with functions for
> handling all the related controls in a form. This is used in the calcul=
ator
> example: There's one script for basic math functions (just to test
> modularisation), there's one script for the calculator "model" and one =
for
> the event handlers.
>
> This technique should work for any scripting language, not just pnuts, =
as
> long as the script functions may be wrapped in a Function. I.e. the Fun=
ction
> interface is the bridge and each scripting language should have a
> corresponding wrapper, like PnutsFunctionFunction (pnuts' function clas=
s is
> PnutsFunction, hence the wrapper is called PnutsFunctionFunction instea=
d of
> just PnutsFunction :-).
>
> Hallvard
>
>
>
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>  =20