Help to create Lightweight widgets

Hi,

I know there is a lot of doc in the web, but I cannot understand well many things...please feel free to help me:

#1 Does addClickListener() and addClickHandler() does the exact same thing (listener is just deprecated) ?

#2 I have created the following widget:

public class AreaPlaceHolder__TA_heavy extends TextArea
{...

addFocusHandler(new FocusHandler() ...

addBlurHandler(new BlurHandler() ...

...}

BecauseI just have a onBlur and onFocus events to intercept, so I would like to optimise this widget such as :

public class AreaPlaceHolder__TA_light extends AreaElement implements BlurHandler, FocusHandler
{...

public void onFocus(FocusEvent event)...

public void onBlur(BlurEvent event)...

}...

- Is it the good/best way to have a lighter version of  AreaPlaceHolder__TA_heavy  (and to always be able to use it in UI Binder)?

#3 When I create my own widget, I do not know 

 - when to extend Widget ?

 - when to extend Composite ?

 - when I am free to extend neither of them ? (I do not know if I need to at least extend one of them)

#4 Finally, I really would like to use event Bubbling, there is a lot of 'little' code on the net, but nothing satisfy me...I mean, I would like to write a little class where a HTMLPanel has 3 differents ButtonElement and the HTMLPanel intercepts :

 - a clickEvent on button1 and say "hello 1" 

 - a clickEvent on button2 and say "hello 2" 

 - a clickEvent on button3 and say "hello 3"

I just see complicated all theses DOM manipulation, sink event so if you can give me the little example I need, I think I will be able to replace a lot of widgets by there Elements and reduce a lot my code (useful for the mobile version).

Thanks you a lot,

Axel

 

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