we had onAdded and onRemoved methods in an experiment recently and
it didn't go well at all. there is considerable danger to this idea.
until rendering
happens, the state of a component is not yet stable. it may have no
parent, for
example. if it has no parent, other preconditions for success may fail,
such as
anything involving the component's associated session or application object.
i think it's better not to notify anyone as the tree is being built
because things
would fail in onAdded that naive users would not expect to fail. worse,
they will do things that /sometimes/ fail. or /rarely/ fail. not good
at all!
Igor Vaynberg wrote:
If we don't guarantee the order I think we should at least introduce two
template methods: onChildAdded(Component) and onChildRemoved(Component).
These would be called from the add(), remove(), removeall(), etc.
Right now you need to look at the internals to know that autoadd() calls
add() internally, removeAll() doesn't call remove() for every object, etc.
Having onChildAdded and onChildRemoved will make it easy to add your own
ordering logic.
Also making iterator() overridable will further facilitate a
user-implemented ordering at render time, although this might open a can of
worms.
-igor
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf
Of Jonathan Locke
Sent: Monday, August 15, 2005 5:09 PM
To: [email protected]
Subject: Re: [Wicket-develop] [ wicket-Patches-1260172 ] add
getchildren to markupcontainer
a good question. we should add it to the javadoc if it's
true. i think we should at least guarantee that
FormComponents are validated in the order they are added.
more than that, i'm not so sure.
Igor Vaynberg wrote:
On a side note,
Is the fact that iterator() now returns items in the order they were
added going to be a formal contract?
-Igor
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