UiBinder view inheritance troubles

[Márcio Menezes]

Hi all.
I'm migrating all my views from the old style to @UiBinder based and I'm facing some troubles
I used to have base views (Composite) in charge of adding common components, ie: EditModelBaseView is in charge of adding the save and cancel button, so that all the sub views will render those components by inheritance.
I can't get it to work... I would need a sort of xml inheritance, besides the the class inheritance, but this doesn't seem to be possible because the compiler complains stating the inherited attributes aren't declared in the subview ui.xml. How would this approach be matched with UiBinder based views?

Marcio

[Thomas Broyer]

Could you give more information? How and where is the base view "adding widgets"? How and where child views add their own widgets?

One thing is: you cannot use a single class hierarchy as the target for two UiBinders; that is, you cannot have a UiBinder<?,BaseView> and a UiBinder<?,ChildView> with ChildView extends BaseView. You can, for example, move your @UiFields from one of the classes to another class (e.g. declare an inner class in BaseView and move the @UiFields to that class, then use a UiBinder<?,BaseView.UiFieldHolder>; that way, the UiBinder<?,ChildView> won't conflict with the BaseView)

But it's really hard to give advice as we don't know what you're trying to do, how you're trying to do it, and what's the problem (error message) exactly.

[Philippe Lhoste]

As Thomas said, it is hard to see what is your exact problem, but for what it is worth,
you can declare UiBinder components and re-use them, like:

<ui:UiBinder
xmlns:ui='urn:ui:com.google.gwt.uibinder'
xmlns:g="urn:import:com.google.gwt.user.client.ui"
xmlns:our="urn:import:com.our.company.web.client"
>

then use it as:

<our:MenuBar/>
or
<our:subpackage.OtherComponent/>

The components must be quite autonomous, perhaps exposing an API for using from other
components.

--
Philippe Lhoste
-- (near) Paris -- France
-- http://Phi.Lho.free.fr
-- -- -- -- -- -- -- -- -- -- -- -- -- --

[Márcio Menezes]

Hey, guys, thanks for the answers...

Thomas, I think what u said is the cause of my problem. I have two ui.xml files, one for the super and another for the sub class. And I'm trying to bind both and put them together in a container afterwards.. ://
I see the limitation, "you cannot use a single class hierarchy as the target for two UiBinders". But I didn't want to have to move the fields of the super class to the sub or the other way around.
What I'm trying to get is a view extending from another view. Why do I want to do this? Because I have a set of views with the same visual pattern, ie: "CRUD" views that need to have save and cancel button, and I didn't want to repeat my self in all the sub views by re-adding the save and cancel button. Nothing new... Pure O.O. concepts.

Really? Isn't there a way of doing this?

Hugs

On Wed, Apr 4, 2012 at 1:19 PM, Philippe Lhoste <Phi...@gmx.net> wrote:

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.

To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to google-web-toolkit+unsub...@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.

[Thomas Broyer]

On Thursday, April 5, 2012 11:58:14 AM UTC+2, Márcio Menezes wrote:

Hey, guys, thanks for the answers...

Thomas, I think what u said is the cause of my problem. I have two ui.xml files, one for the super and another for the sub class. And I'm trying to bind both and put them together in a container afterwards.. ://
I see the limitation, "you cannot use a single class hierarchy as the target for two UiBinders". But I didn't want to have to move the fields of the super class to the sub or the other way around.
What I'm trying to get is a view extending from another view. Why do I want to do this? Because I have a set of views with the same visual pattern, ie: "CRUD" views that need to have save and cancel button, and I didn't want to repeat my self in all the sub views by re-adding the save and cancel button. Nothing new... Pure O.O. concepts.

Really? Isn't there a way of doing this?

Use composition rather than inheritance; or use the "inner class" trick I described earlier (that's entirely private to the super-class, so it shouldn't affect your subclasses).

[Márcio Menezes]

Hmm... not bad...

Thanks a lot! :)

--

You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.

To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/QSD7bV1AYHcJ.

To post to this group, send email to google-we...@googlegroups.com.
To unsubscribe from this group, send email to google-web-tool...@googlegroups.com.