On 1 avr, 09:28, magbyr <[email protected]> wrote:
> Hello.
>
> I'm having some trouble understanding the new event handlers.
> When creating a composite A containing widgets B and C, I want
> different events from B and C to create a ValueChangeEvent on A. This
> way other widgets using A can handle one event instead of two.
>
> A - ValueChangeHandler
> B - KeyUpHandler
> C - ChangeHandler
>
> What's the best way to do this?
I haven't yet used the new event system, so I might be wrong, but
here's my attempt:
> class A extends Composite implements HasValueChangeHandlers<String> {
> private Panel container;
> private TextBox B;
> private ListBox C;
>
> A() {
> B.addKeyUpHandler(
new KeyUpHandler() {
public void onKeyUp(KeyUpEvent event) {
fireValueChanged();
}
}
> );
> C.addChangeHandler(
new ChangeHandler() {
public void onChange(ChangeEvent event) {
fireValueChanged();
}
}
> );
> container.add(B);
> container.add(C);
> initWidget(container);
> }
>
> public HandlerRegistration addValueChangeHandler
> (ValueChangeHandler<String> handler) {
return addHandler(handler, ValueChangeEvent.getType());
> }
private void fireValueChanged() {
ValueChangeEvent.fire(this, <your value here>);
}
> }
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