But when I create the menu I have to write the behaviour of each
widget (when hide/show etc), so I have to instance them. I know what
you mean by using Singleton but with that approach I can specify the
behaviour, because they're not created yet.
What I want is a way to create a menu with widgets associated to it
and work like a standard web app with html pages, showing the widget
requested in the menu and hiding the other ones. But the problem is
that I´d like not having to instance all widgets at the beggining, but
I don´t see any other way to give them the correct behaviour.
Any other help?
Thx
On 27 oct, 13:56, Jeff Schwartz <jefftschwa...@gmail.com> wrote:
> 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 <blay...@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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> --
> Jeff
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