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https://issues.apache.org/jira/browse/WICKET-3776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Igor Vaynberg resolved WICKET-3776.
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Resolution: Won't Fix
Assignee: Igor Vaynberg
> Implement default onConfigure() using optional Predicate
> --------------------------------------------------------
>
> Key: WICKET-3776
> URL: https://issues.apache.org/jira/browse/WICKET-3776
> Project: Wicket
> Issue Type: Improvement
> Components: wicket-core
> Affects Versions: 1.4.17
> Reporter: Russell Morrisey
> Assignee: Igor Vaynberg
> Labels: ConfigurationPredicate, Predicate, component,
> onConfigure, setEnabled, setVisible
>
> I would really like to see methods on Component to configure visible and
> enabled state using a predicate pattern. Ex:
> interface ConfigurationPredicate<T extends Component> extends IDetachable {
> boolean evaluate(T component);
> }
> ...
> DropDownChoice ddc = createDDC(); //my convenience method which sets standard
> properties, creates a label for the component, and other stuff
> ddc.setVisibility(new ConfigurationPredicate<DropDownChoice>() {
> public boolean evaluate(DropDownChoice component) {
> myOtherComponent.configure();
> return (myOtherComponent.isVisibleInHierarchy());
> }
> public void detach() {
> myOtherComponent.detach();
> }
> });
> Please consider creating an optional field on Component which can hold a
> visibility predicate and an enabled state predicate. You can see the
> advantage clearly in the code above: I don't have to inline my convenience
> method. I would like composition to be used, instead of inheritance, so I
> don't have to subclass DropDownChoice just to control the visibility.
> Thanks, guys!
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