Cell Browser External Listener

[Sam Wootton]

Dear GWT Users,

Thanks in advance for any help.

I have working CellBrowser that I want to add an external listener to (so that I can display data clicked on... but outside and in another panel).  I see CellBrowser implements HasClickHandlers (and addClickHandler).

http://www.gwtproject.org/javadoc/latest/com/google/gwt/user/cellview/client/CellBrowser.html

I can successfully handle an event internally in my Cell i.e.

public void onBrowserEvent(Context context, Element parent, Track value, NativeEvent event, ValueUpdater<Track> valueUpdater) {
   
    super.onBrowserEvent(context, parent, value, event, valueUpdater);
    
    if ("click".equals(event.getType())) {
     
        EventTarget eventTarget = event.getEventTarget();
        GWT.log("You selected " + value.getName() + " by " + value.getArtist());
    }
}

I thought (given the interfaces it implements) I could do something like

CellBrowser cellBrowser = cbb.build();

cellBrowser.addHandler(new ClickHandler() {
    @Override
    public void onClick(ClickEvent clickEvent) {
        
    }
});


But it appears not.  What and how is the best way to externally listen to CellBrowser and Cell events, so that I can display the event info "outside" in another e.g. Panel?

Regards, Sam

[Jens]

Since "click" is a browser event you would need to use addDomHandler() instead of addHandler().

If that does not work either then I would let the Cell publish a custom Event on the EventBus. Maybe using custom events via EventBus is more readable anyways.

-- J.

[Sam Wootton]

Hello Jens,

Thanks for your help.  I managed to add

cellBrowser.addDomHandler(new ClickHandler() {

    @Override
    public void onClick(ClickEvent clickEvent) {

        GWT.log("DownloadPanel.onClick "+clickEvent.getNativeEvent().toString());
    }
}, ClickEvent.getType());

But that doesn't get me the domain / model data I need (logical event data I guess).  So i ended up being a bit hacky and firing event from within the Cell

TreeViewModelListener listenerObj = (TreeViewModelListener) listeners.get(i);
DownloadSelectedEvent downloadSelectedEvent = new DownloadSelectedEvent(param1, param2, param3...);
listenerObj.onDownloadSelected(downloadSelectedEvent);

and implemented listener interface and implemented

public void onDownloadSelected(DownloadSelectedEvent event){}

well it worked :]

Regards, Sam

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[Thomas Broyer]

Have a look at the ActionCell and ButtonCell's API.

ActionCell has its own Delegate, while ButtonCell will use the ValueUpdater, but in the end they're very similar.

On Friday, February 26, 2016 at 4:43:36 PM UTC+1, Sam Wootton wrote:

Hello Jens,

Thanks for your help.  I managed to add

cellBrowser.addDomHandler(new ClickHandler() {
    @Override
    public void onClick(ClickEvent clickEvent) {
        GWT.log("DownloadPanel.onClick "+clickEvent.getNativeEvent().toString());
    }
}, ClickEvent.getType());

But that doesn't get me the domain / model data I need (logical event data I guess).  So i ended up being a bit hacky and firing event from within the Cell

TreeViewModelListener listenerObj = (TreeViewModelListener) listeners.get(i);
DownloadSelectedEvent downloadSelectedEvent = new DownloadSelectedEvent(param1, param2, param3...);
listenerObj.onDownloadSelected(downloadSelectedEvent);

and implemented listener interface and implemented

public void onDownloadSelected(DownloadSelectedEvent event){}

well it worked :]

Regards, Sam

On 26 February 2016 at 13:38, Jens <jens.ne...@gmail.com> wrote:

Since "click" is a browser event you would need to use addDomHandler() instead of addHandler().

If that does not work either then I would let the Cell publish a custom Event on the EventBus. Maybe using custom events via EventBus is more readable anyways.

-- J.

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