Re: About widgets management

You can do it either way depending upon your requirements. If you want your widgets to maintain their state use singletons with a POJO getter factory method which is easy to implement. For example, let's say you have a composite widget YourWidgetClass. Just add the following code to it.

private static YourWidgetClass instance = null;
public static YourWidgetClass getInstance(){
    if(null == instance){
        instance = new YourWidgetClass();    // or a non default constructor if you require
    }
    return instance;
}

private YourWidgetClass(){}    // make all your constructors private

Now anywhere you need to reference YourWidgetClass you do so by calling YourWidgetClass.getInstance() instead of its constructor. Because YourWidgetClass is now a singleton whatever state it maintains will always be available.

Jeff

On Wed, Oct 27, 2010 at 7:05 AM, Pablo G.F <blayhck@gmail.com> wrote:

I´m a newbie to GWT.
My scenario is:

My project is a web application. My idea is using a top menubar, with
some menuItems. Click on one of this menuItems, will "open" a widget
like a search form with a grid to show results, another kind of form,
etc. Like if a regular web page with links in a menu bar on top.
I have to main questions:

a) In case of implementing this with pure GWT, the menu and the pages
(by pages in this case I mean , widgets composite by forms, grids ,
etc ). Have I to create all widgets and show/hide them depending on
the menuItem clicked, or can I create  / delete dinamically? Because
creating them it´s obviously inefficient.

b) I think it would be easier if the menu loads .html pages with GWT
widgets on them. So the widget loads when the html page loads. But I
don´t know if this is possible and how to do it with GWT (I mean, the
menubar made in GWT, acting like a regular HTML menu, like using
links).

Sorry if it´s not very clear what I´m trying to say, (because I know
it isnt), but I don´t  know exaclty where to start or what to do
exaclty.

In resume, i want a web application with a menu where to select what
part of my application to show.

Thanks, and sorry for my English ;)

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