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From "Robert Zeigler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (TAP5-103) provide access to component parameters from within mixins
Date Fri, 03 Oct 2008 17:42:44 GMT

    [ https://issues.apache.org/jira/browse/TAP5-103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636690#action_12636690

Robert Zeigler commented on TAP5-103:

I think Howard's idea of linking mixin parameters to component parameters sounds cool.  Could
this be done as a set of chained bindings? So, the page has a property "foo" bound to the
component a's "value" parameter.  Mixin B does something like:

private Object value;

Now, the binding is altered so that: 
  foo => mixinb.value => componenta.value

So a change to componenta.value would propagate to mixinb.value and from there be pushed to
to the page's foo property?

This might break down with multiple mixins, unless you chained them all together, in the order
that they're defined for the component, perhaps:

foo => mixina.value => mixinb.value => mixinc.value => componentd.value

Not sure how feasible this is.  
But this is definitely a crippling issue for mixins.  Mixins have the potential to be really
cool, but as they stand now, they're only sorta cool, because many of the more interesting
things you would want to do with them require access to the underlying component's parameters.

> provide access to component parameters from within mixins
> ---------------------------------------------------------
>                 Key: TAP5-103
>                 URL: https://issues.apache.org/jira/browse/TAP5-103
>             Project: Tapestry 5
>          Issue Type: Bug
>    Affects Versions: 5.0.15
>            Reporter: Kristian Marinkovic
> A mixin can't access the parameters of a component because the Bindings property of the
InternalComponentResourcesImpl class is private and the respective interface does not provide
a access method. 
> I was trying to create a mixin that would render only the value of a form element  (without
the tags) when it was in a certain state. There also might be use cases where mixins are used
to collect data from the components they are attached and therefore also needs access to the
components parameters.
> see threads:
> http://www.nabble.com/Antwort%3A--T5--how-to-read-the-value-of-a-component-parameter-within-a-mixin-tf4487995.html
> http://www.nabble.com/-T5--how-to-read-the-value-of-a-component-parameter-within-a-mixin-tf4487597.html

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