Current status (and some questions) on markup inheritance
Assuming your base class markup looks like:
base: before
<wicket:child/>
base: after
and your subclass markup like:
extension: before
<wicket:extend>
extension: middle
</wicket:extend>
extension: after
than what currently will be returned is:
extension: before
<wicket:extend>
base: before
<wicket:child>
extension: middle
</wicket:child>
base: after
</wicket:extend>
extension: after
But I wonder if stripping "extension: before" and "extension:after"
makes more sense. It would make it more consistent with Panel and
Border as well. I failed to come up with an use case where I actually
need extension:before/after. What do you think?
Automatically stripping extension:before/after however is not easy as
well. Reason: The only thing that differs from a "normal" Page is
<wicket:extend>. In order to know whether to remove the preceding
RawMarkup is by reading-ahead and checking if there is a
<wicket:extend> or not. And I'm not very fond of reading ahead.
Assuming there is no value to extension:before/after what about the
idea of not using <wicket:extend> at all (just merge the whole markup
with superclass markup at <wicket:child>) and using a marker interface
or a flag/property to be set with the Component. Component/Page would
than decide on the interface or the property whether to inherit the
markup or not.
One more question: I was thinking about the component hierachy. I
assume it makes sense (avoid the problem of identical component names)
to separate the base markup/class and subclass markup/class into two
separate components, e.g. ..../<subclass-id>/_child. Assuming your
base class markup is inherited as well, you'd end up with hierachies
like .../<subclass-id>/_child/_child. Base class components gets added
to _child and subclass components to <subclass-id>. Does that make
sense?
Juergen
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