Brett Ryan wrote:
>
> But it's not baked into swing and other areas where a component model
> is needed, there maybe API's out there, but they aren't something I
> can discover. If I'm given a component from some component author who
> has quite simply developed some swing control, how do I place that
> control on a designer and be able to expose the properties of that
> component? Exposing events aren't as bad although not as easy as if we
> had true events.
>
> In the end we do something like the attached example I posted a few
> posts ago that iterates over the classes declared methods. Even still,
> I've just realised my example doesn't take the Boolean `is' into
> account.
>
> http://bean-properties.dev.java.net may be one solution, but whatever
> the solution is the actual components need to be unified to support
> property discovery.
>
> If you do have a way to unify getters/setters into a property without
> having to try and discover them I'd be interested to see.
The call
Introspector.getBeanInfo(Foo.class).getPropertyDescriptors()
will give you all the properties on the class Foo, their name, type,
getter, setter, bound-ness, constrained-ness, PropertyEditor, etc.
And according to it, your earlier example
class Bar {
public String getFoo() { return ""; }
public void setFoo(int val) {}
}
has a read only property named "foo" of type String.
The JavaBeans spec was written when AWT was still being hyped heavily,
and Java people were dreaming of a drag-and-drop type of GUI painting
paradigm. Anyone remember Bongo? I'm sure it would qualify as a Java
app of the week had the JavaPosse been on the air then.
Java did not dominate in GUI development. Looking back, that's when a
nice developer box have 16MB, maybe 32MB RAM, and production servers
have 64MB RAM. My VB5 developer colleagues were laughing their heads
off when I downloaded Swing 0.3 (or 0.4) and the SwingSet demo started
up in 20 minutes!
--
Weiqi Gao
[EMAIL PROTECTED]
http://www.weiqigao.com/blog/
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