Re: RootPanel.get(String) +

Fri, 11 Sep 2009 08:18:36 -0700 


On Sep 11, 10:40 am, Ian Bambury <[email protected]> wrote:
> If I understand you correctly, you should be able to do what you say you
> did. E.g. if your HTML has a div with an id of "someId" and some text
> content, then this
>
>      VerticalPanel p = new VerticalPanel();
>      p.add(new Label("Hello"));
>      p.setBorderWidth(3);
>      RootPanel.get().add(p);
>
> will add a bordered box with "Hello" underneath it, as you'd expect.
>
> and this
>
>      VerticalPanel p = new VerticalPanel();
>      RootPanel r = RootPanel.get("someId");
>      p.add(r);
>      p.add(new Label("Hello"));
>      p.setBorderWidth(3);
>      RootPanel.get().add(p);
>
> will put the text from the div inside the VP
>
> Ian
>

I haven't tried it but it probably would work.  I actually don't need
to add RootPanel wrappers inside a non-root panel, it was just a
typo.  The reason my code did not work and yours probably would is the
last line:

>      RootPanel.get().add(p);

Which my code did not do...and as Thomas stated, I had moved the
vertical panel to somewhere that was not attached yet.

To give some context, the reason for this is to create a view within a
view.  This is a trivialized example of what I need -- without getting
into details, but let's say you wanted to show a pop-up that can show
the same app inside itself.  So, I have an immutable wrapper like
this:

public class Layout {
    private Panel header;
    private Panel menu;
    ...
    public Layout(Panel header, Panel menu, ...) { this.header =
header...  }

    public Panel getHeader( ) { return header; }
    ...
}

In onModuleLoad, I create two of these:

Layout layout = new Layout(RootPanel.get("header"), ...)

Layout internalLayout = new Layout(new VerticalPanel( ), ...)

I pass the layout reference to main app presenters, and I pass the
internal layout to a presenter with a view that can show a pop-up of
the app inside itself.

This works.  It wasn't working before because I was erroneously
passing the "layout" reference to the internal view presenter, which
caused the root panels to get moved, and thus return null, thus
leading to NPE, etc.
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