Add keyHandler to Absolute panel

[bond]

Hi,
it's possibile to add a keyHandler to an absolute panel or, more
generically, to a widget?
I've noticed that keyHandler is present only on a TextBox but I need
to catch the event on a Panel.

Thanks

[Alyxandor]

YourWidget.addDomHandler(new KeyUpHandler(){
public void onKeyUp(KeyUpEvent event) {
// TODO Auto-generated method stub

}

}, KeyUpEvent.getType());


Just like real DOM, you've got to manually add KeyUp, KeyPress and
KeyDown. This saves on memory leaks, and is more efficient than using
onBrowserEvent()... Which you can also use.

YourWidget = new FlowPanel(){
@Override
public void onBrowserEvent(Event event) {
switch(event.getTypeInt()){
case Event.ONKEYUP:

}
}
};

Also, you can manually add an old event listener, but you've got to
set and clear events yourself {that's what HandlerRegistration is
for}:

DOM.setEventListener(YourWidget.getElement(), new EventListener(){
public void onBrowserEvent(Event event) {
// TODO Auto-generated method stub

}
});
DOM.sinkEvents(YourWidget.getElement(), Event.ONKEYUP);



...If you want to grab key events, only certain DOM elements are
normally capable of receiving key events, so you might want to do:

Event.addNativePreviewHandler(new NativePreviewHandler(){
public void onPreviewNativeEvent(NativePreviewEvent event) {
if (event.getTypeInt()==Event.ONKEYPRESS){

}
}
});

JUST MAKE SURE YOU CLEAR THE NATIVE EVENT PREVIEW WHEN YOUR WIDGETS
DETACH, OR STUFF LIKE POPUP PANEL MIGHT DIE ON YOU!

[bond]

Thanks very much Alyxandor

Regards

Daniele

[王屋山下]

I have met the same problem.

I have a panel that extends gwtext's panel class.(Gwttxt's panel class
has extended gwt's widget class)

My code:
this.addDomHandler(new KeyPressHandler(){

public void onKeyPress(KeyPressEvent event) {
System.out.println("dddddddddd");

}

},KeyPressEvent.getType());

addDomHandler(new KeyUpHandler(){
public void onKeyUp(KeyUpEvent event) {
// TODO Auto-generated method stub

System.out.println("dfasdfasdfasdf");
}

}, KeyUpEvent.getType());

But nothing happened.

please help me.