On Tuesday, January 17, 2012 3:49:14 AM UTC+1, Cristian Rinaldi wrote:
>
> Hello:
>
> The real question is: I have a widget to inherits of ComplexWidget with
> the following declarations:
>
> private Element root = Document.get().createDivElement();
> private LayoutPanel header = new LayoutPanel();
> private Image imgUp = new Image(getDefaultResources().imageUp());
>
> header.add(label);
> .....
> .....
> root.appendChild(header.getElement());
>
Unless you know exactly what you're doing, do not by any mean append
widgets using their getElement(). Always put widgets inside other
(container) widgets, otherwise the child widget's onAttach/onLoad and
onDetach/onUnload won't be called, the events won't work, etc.
That is, when you are compositing widgets, extend Composite (or
ResizeComposite), not Widget.
.....
> .....
> setElement(root);
> sinkEvents(Event.ONCLICK);
>
> Now I add a domHadler for image (the only event that interests me), but,
> sinkEvents(Event.ONCLICK) register the event at level of element root, I
> don't know how propagate the event at image, so that only the image, treats
> you, and not the other elements of the widget.
>
> I made this:
>
> imgUp.addDomHandler(new ClickHandler() {
>
> @Override
> public void onClick(ClickEvent event) {
> header.setWidgetTopHeight(imgUp, 0, PX, 0, PX);
> header.setWidgetTopHeight(imgDown, 0, PX, 30, PX);
> collapsed = !collapsed;
> collapseBody(collapsed);
> }
> }, ClickEvent.getType());
>
> But entire the widget treats the event.
>
> Any idea?
>
If you added you Image inside another widget (and not taking the image's
getElement to append it to an Element), that would "just work", you
wouldn't even need a sinkEvent(ONCLICK) at the container level.
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