Using pickers for XWiki Rendering Macro parameters

The type property of a XWiki.WikiMacroParameterClass object allows to specify into which Java type the parameter value (defined as a String) must be converted to.
Depending of the type provided, a custom picker can be used instead of the default one when editing the macro parameters in the wysiwyg editor.

Here are the types implementing a custom picker:

You can also provide the reference of an existing Java Enum to get a custom select picker with its values. If you want to create a custom enum for your parameter, you can try the following approach.

You can find the pickers implementation.