How to use <g:DialogBox> UIBinder definition from Java

[Ovidiu Gheorghies]

Hello,

The DialogBox API (http://google-web-toolkit.googlecode.com/svn/
javadoc/2.0/com/google/gwt/user/client/ui/DialogBox.html) notes that a
DialogBox can be defined as a UIBinder template as follows:

<g:DialogBox autoHide="true" modal="true">
<g:caption><b>Caption text</b></g:caption>
<g:HTMLPanel>
Body text
<g:Button ui:field='cancelButton'>Cancel</g:Button>
<g:Button ui:field='okButton'>Okay</g:Button>
</g:HTMLPanel>
</g:DialogBox>

What is the proper way of using this definition from Java code?
Supposing that the above definition is contained in
NotificationWindow.ui.xml, the following naive approach to
NotificationWindow.java does not work:

public class NotificationWindow extends Composite {
private static NotificationWindowUiBinder uiBinder =
GWT.create(NotificationWindowUiBinder.class);
interface NotificationWindowUiBinder extends UiBinder<Widget,
NotificationWindow> {}

@UiField DialogBox dialogBox;

public NotificationWindow() {
initWidget(uiBinder.createAndBindUi(this));
}

public void show() {
dialogBox.show();
}
}

If the EntryPoint-derived class calls:

(new NotificationWindow()).show();

then the following exception is logged:

java.lang.IllegalStateException: This widget's parent does not
implement HasWidgets

How is the <g:DialogBox> definition from the DialogBox API used
correctly from Java code?

Best regards,
Ovidiu

[Christian Goudreau]

That's how :

http://pastie.org/816302

Christian

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[Thomas Broyer]

There are two possibilities: inheriting DialogBox or having a
DialogBox field (but then not inheriting a Widget).

Solution #1: inheriting a DialogBox

class NotificationWindow extends DialogBox {
...

public NotificationWindow() {
// we don't care about the returned value, it'll be 'this'
uiBinder.createAndBindUi(this);
}

@UiFactory
DialogBox thatsJustMe() {
// UiBinder will call this to get a DialogBox instance
// and this is the DialogBox instance we want to use
return this;
}

...
}

Solution #2: not inheriting DialogBox

// Note: do NOT inherit Composite, Widget or UIObject!
class NotificationWindow {
...

private DialogBox dialogBox;

public NotificationWindow() {
dialogBox = uiBinder.createAndBind(this);
}

public void show() {
dialogBox.show();
}

...
}

[Stefano Ciccarelli]

Solution #1 doesn't work for me. I get this error:

Second attempt to set initializer for field "f_DialogBox1", from "new com.google.gwt.user.client.ui.DialogBox(false, true)" to "owner.thatsJustMe()"

Hints or suggestions?

}

[Christian Goudreau]

First, give us your code for you .java and for your .ui.xml.

I'll see what  I can do for you, I also had some problems first time I tried this. Note that I'm using Gwt-Presenter in my example.

Christian

[Stefano Ciccarelli]

Sorry, I was talking about Thomas Broyer solution #1.

Your code (pastebin) is what I was already doing.

BTW this is the .java:

public final class AboutDialogDisplay {

    @Inject

    private AboutDialogDisplay() {

        uiBinder.createAndBindUi(this);

    }

    @UiFactory

    DialogBox thatsJustMe() {

        return this;

    }

}

And this is the .ui.xml:

<g:DialogBox animationEnabled="true" glassEnabled="true" modal="true">

    ......

</g:DialogBox>

Thanks

Stefano

[Christian Goudreau]

In your code, for solution #1, you need to extends DialogBox, you forgot that.

For my solution, I only encapsulate DialogBox within an HTMLPanel an then I added two public function for showing and hiding my dialogbox. (Solution #2) Btw, I found solution #2 less intrusive and more simple.

[Christian Goudreau]

Oh no his solution #2 isn't like mine at all, lol, but anyway, do you really need @Inject ? There's nothing to inject in your example.

[Stefano Ciccarelli]

I'm already doing like you, but I'd like to try the solution #1 explained by Thomas Broyer, so the code is from that test. The class already extends DialogBox and I get the error reported, the extends is missing because I done something wrong with cut&paste.

I need @Inject because that class is the Display injected in a Presenter.

I want to try that solution because I prefer to extends DialogBox.