Custom tags in UiBinder files

Question

When using a <g:LayoutPanel> in UiBinder.ui.xml files, you can specify <g:layer> tags. Some other Google-built widgets have special tags like that as well - <g:tab> even has a sub-tag, <g:header>.

How can I specify these for my own widgets?

Answer 1

The new answer to this question, after some GWT improvements, is at https://stackoverflow.com/a/11785903/439317 . Copied below to avoid moderator deletion (maybe?).

You can use @UiChild to declare special functions in your widgets accessible in UiBinders.

for example,

class MyPanel extends AbsolutePanel {

    @UiChild
    public void addAt(Widget w, String parameter1, String parameter2) {
         ....

Then, in your uiBinder, you can say

<custom:MyPanel>
    <custom:at parameter1="HI" parameter2="Anything you like!">
        <g:AnySingleWidget />
    </custom:at>
</custom:MyPanel>

See @UiChild at http://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/uibinder/client/UiChild.html

Answer 2

What you're looking for is a custom element parser for UiBinder. See this issue. Unfortunately it's not supported yet.

You might be interested in this post for some guidance on how to extend the current parser on your own.