How do I to fire a Gwt event from JavaScript ?
2010/4/12 Elmaho <[email protected]>
> Hey everyone,
>
> I want to integrate MooFlow external lib in my Gwt Application, so I
> begin by reading the essentials of JSNI and doing my things.
> So far it's OK, I create the Impl class to wrap the functions I need,
> I create also the JSObject and finally the widget itself (called
> CoverFlow).
>
> Now all I need is to add the possibility to catch the onClickView
> Event in my widget (java widget).
> With the implementation below, I can't see the HEY message when I
> click on an image, it sounds like the line:
>
> cfo.addEvent('onClickView', ...
>
> don't work in my Impl class !!!
>
> this is my Impl class
>
> public class CoverFlowImpl {
>
> public native CoverFlowScriptObject create(Element container, int
> startIndex, boolean useSlider) /*-{
>
> var options = {
> useSlider: useSlider,
> useAutoPlay: false,
> useCaption: false,
> useResize: false,
> useWindowResize: false,
> useMouseWheel: true,
> useKeyInput: true,
> startIndex: startIndex
> };
>
> var mf = new $wnd.MooFlow(container, options);
> return mf;
>
> }-*/;
>
> public native void loadJSON(CoverFlowScriptObject cfo, String json)
> /
> *-{
> cfo.loadJSONArray(json);
> }-*/;
>
> public native void addClickViewHandler(CoverFlowScriptObject cfo,
> HasSelectedItemChanged handler) /*-{
>
> cfo.addEvent('onClickView', function(obj){
>
> alert('HEY'); //just to indicate if the
> event is fired
>
> var event =
> @com.audaxis.gwt.ui.coverflow.client.SelectedItemChangedEvent::new()
> ();
> [email protected]
> ::fireEvent(Lcom/
> google/gwt/event/shared/GwtEvent;)(event);
> };
>
> }-*/;
> }
>
>
> The Opaque JS Object
>
> public final class CoverFlowScriptObject extends JavaScriptObject{
>
> private final static CoverFlowImpl impl = new CoverFlowImpl();
>
> protected CoverFlowScriptObject() {}
>
> public static CoverFlowScriptObject createCoverFlow(Element
> container, int startIndex, boolean useSlider){
> return impl.create(container, startIndex, useSlider);
> }
>
> public void laodJSON(String json){
> impl.loadJSON(this, json);
> }
>
> public void addClickViewEvent(HasSelectedItemChanged handler){
> impl.addClickViewHandler(this, handler);
> }
> }
>
>
>
> My Widget
>
> public class CoverFlow extends Composite implements
> HasSelectedItemChanged{
>
> private Panel simplePanel;
> private CoverFlowScriptObject cvo;
> private Collection<CoverFlowItem> items;
>
> public CoverFlow() {
> init(null);
> }
>
> protected void init(Panel parent){
> simplePanel = parent != null ? parent : new SimplePanel();
> cvo = getCoverFlowJSObject();
> initWidget(simplePanel);
> }
>
> @Override
> public HandlerRegistration
> addSelectedItemChanged(SelectedItemChangedHandler handler) {
> cvo.addClickViewEvent(this);
> return addHandler(handler,
> SelectedItemChangedEvent.getType());
> }
> }
>
>
> And finally -----------HasSelectedItemChanged
>
>
> public interface HasSelectedItemChanged extends HasHandlers{
>
> HandlerRegistration
> addSelectedItemChanged(SelectedItemChangedHandler
> handler);
> }
>
> Is my implementation correcte ?
> Is this the right implementation to fire events from JavaScript to
> Java ?
>
> Could anyone help me please !!
>
> Thanks in advance
>
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