Multiple abstract/implement tags instead of child/extend
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Key: WICKET-1134
URL: https://issues.apache.org/jira/browse/WICKET-1134
Project: Wicket
Issue Type: New Feature
Components: wicket
Reporter: Stefan Fußenegger
Priority: Minor
The current implementation of wicket:child and wicket:extend only allows for a
single extension per subpage. However, this restriction is neither mandated by
java class hierarchy nor by any other reason. Therefore, it should be possible
to extend the current implementation to support multiple 'abstract' sections,
just like abstract methods in java classes. This could be done by replacing
<wicket:child>
<wicket:extend>
some content
</wicket:extend>
</wicket:child>
with
<wicket:abstract id="foo">
<wicket:implement id="foo">
some content
</wicket:extend>
</wicket:child>
(new names have been suggested in
http://www.nabble.com/Multiple-%3Cwicket%3Achild--%3E-tags-on-a-single-base-page--tf4738673.html)
A possible application is a layout with two columns, e.g. a header with
navigation, a left column with sub-navigation and a right column with content
(where the sub-navigation may change depending on the section. In deed, this is
already possible using panels or similar means. However, it would allow to take
advantage of markup inheritance only:
BasePage extens WebPage:
<div wicket:id="links>[some nav links here]</div>
<div><wicket:abstract id="subNavigation">[left navigation goes
here]</wicket:abstract></div>
<div><wicket:abstract id="content">[content goes here]</wicket:abstract</div>
SectionPage extends BasePage:
<wicket:implement id="subNavigation">[sub navigation links
here]</wicket:implement>
FooPage extends SectionPage:
<wicket:implement id="content">[content goes here]</wicket:implement>
-- stefan
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