You almost have ripped my code ;) But this is the way I did it, but I don`t have to subclass the extended class but use a toDisplayValue-strategy instead.
________________________________
From: [EMAIL PROTECTED] on behalf of Matej Knopp
Sent: Sun 17-7-2005 0:41
To: wicket-user@lists.sourceforge.net
Subject: Re: [Wicket-user] customize display-value for choicelist.
Hmm.. I've extended the ChoiceList class to get this behavior. It works,
but I really don't know if there's not a better solution for 1.0.
In 1.1 things have changed and ChoiceList will no longer exist. Johan
Compagner has posted details ~week ago.
As for 1.0, I've done it this way
public class ChoiceListExt extends ChoiceList {
/** Creates a new instance of ExtChoiceList */
public ChoiceListExt () {
super ();
}
/**
* Creates a new instance of ExtChoiceList using given
* collection.
* @param choices - the wrapped collection
*/
public ChoiceListExt (final Collection choices) {
super (choices);
}
private class ExtChoice implements IChoice {
/** The index of the choice */
private final int index;
/** The choice model object */
private final Object object;
/**
* Constructor
*
* @param object
* The object
* @param index
* The index of the object in the choice list
*/
public ExtChoice (final Object object, final int index) {
this.object = object;
this.index = index;
}
/**
* @see wicket.markup.html.form.model.IChoice#getDisplayValue()
*/
public String getDisplayValue () {
return ChoiceListExt.this.getDisplayValue (object);
}
/**
* @see wicket.markup.html.form.model.IChoice#getId()
*/
public String getId () {
return Integer.toString (index);
}
/**
* @see wicket.markup.html.form.model.IChoice#getObject()
*/
public Object getObject () {
return object;
}
}
/**
* Creates and returns new choice for object at given index.
* @param index - index of desired object
* @param object - this parameters is not used
*/
protected IChoice newChoice (final Object object, final int index) {
return new ExtChoice (getList ().get (index), index);
}
/**
* Returns a string describing given object. This is the function
* user should re-implement to allow arbitrary objects descriptions.
* @param obj - the object
* @return string describing the given object
*/
protected String getDisplayValue (Object obj) {
return obj.toString ();
}
}
Creating anonymous instance of ChoiceListExt and overiding
getDisplayValue for each case.
Peter Veentjer - Anchor Men wrote:
> What is the easiest way to customize the display-valuefor the items in the
> ChoiceList (except overriding the toString of the object itself)? I have been
> looking through the sources (ChoiceListModel) but I can`t find an easy way. I
> know I could write an implementation of the ChoiceList where I can control
> the IChoice creation (and the toDisplayValue implementation) but sounds like
> a lot of work for such a general problem.
>
> Maybe it would be an idea to add a toString strategy.
>
>
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