ConditionalAutocomplete and Tapestry 5.4

Hi,

I am trying to upgrade from Tapestry 5.3 to 5.4 and I encountered a problem with built-in mixin Autocomplete.

It is quite useful if the mixin takes effect just if some condition is met. So I have implemented a custom mixin by subclassing the built-in one.

Here is the important snippet of code:

public class ConditionalAutocomplete extends Autocomplete
{
    @Parameter(name = "test", required = true, allowNull = false, defaultPrefix = BindingConstants.PROP)
    private boolean enabled;

    ...

    @Override
    protected void configure(final JSONObject config)
    {
        super.configure(config);
        if (!enabled)
        {
            config.put("frequency", 365 * 24 * 60 * 60); // fire an Ajax request after the "ethernity" elapses
            config.put("minChars", 1000000000); // at least "infinity" characters must be entered to fire an Ajax request
        }
    }

    ...
}

I admit that disabling the feature by setting frequency and minChars to ethernity and infinity is somewhat tricky and can be considered as dirty. On the other hand, I have achived the required feature by reusing the existing built-in mixin with all its features.

The mixing can be used in a template file like this:

<t:textfield value="userEmail" t:mixins="conditionalAutocomplete" test="userAutocompleteSupported"/>

The built-in mixin Autocomplete seems to be rewritten in Tapestry 5.4 and there is no method configure anymore.

Is there any chance to implement the ConditionalAutocomplete with Tapestry 5.4?

I can copy the code of Autocomplete.java and make some changes in it instead of subclassing. However, I am trying to find some better solution as such copying can cause troubles in next Tapestry upgrade.

Thanks for help.

Jarda
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