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
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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