Hi all. I was working with some GWT widgets, and found that Hyperlink and Button are some of the most commonly used ones. However, I am not sure as to what is the standard (and better !!) paradigm, to define the "onClick" methods for these widgets.
Following are some of the possibilities : 1. Instantiate a button in a manner (as given at http://google-web- toolkit.googlecode.com/svn/javadoc/1.5/com/google/gwt/user/client/ ui/Button.html ///////////////////////////////////////////////////////////////////////////// START Button b = new Button("Jump!", new ClickListener() { public void onClick(Widget sender) { Window.alert("How high?"); } }); ///////////////////////////////////////////////////////////////////////////// END 2. Add clickListener separately. ///////////////////////////////////////////////////////////////////////////// START Button b = new Button("Jump!"); b.addClickListener (referenceOfClassImplementingClickListenerInterface); ///////////////////////////////////////////////////////////////////////////// END Note that in this case, "referenceOfClassImplementingClickListenerInterface" may be of any type (a widget wrapping "b"; a page wrapping "b"; a module wrapping "b"). 3. Extend "Button", as in : ///////////////////////////////////////////////////////////////////////////// START public abstract class EButton extends Button implements ClickListener{ public EButton(){ addClickListener(this); } public abstract void onClick(Widget sender); } ///////////////////////////////////////////////////////////////////////////// END which may then be used as :: ///////////////////////////////////////////////////////////////////////////// START EButton buttonForActionOne = new EButton(){ @Override public void onClick(Widget sender) { Window.alert("In One"); } }; EButton buttonForActionTwo = new EButton(){ @Override public void onClick(Widget sender) { Window.alert("In Two"); } }; ///////////////////////////////////////////////////////////////////////////// END In this case, instantiating a new reference for EButton, "forces" the user to define its "action-on-click" there and then. Also, this also binds the widget and the "action-on-click" in a cohesive unit, as Ebutton is a clickListener to itself. Thus, I will be grateful if some help could be provided in figuring out what seems to be the most-preferred way to define the "action-on- click" for widgets like Button and Hyperlink .. Looking forward to replies. Ajay Garg --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~----------~----~----~----~------~----~------~--~---
