About widgets catalog

A widget catalog is an object with a single function show that take a select callback and cancel callback as parameter.

This object is responsible of manipulating the actual DOM the way it needs to display a widget catalog. The only thing needed is to call the two provided callbacks based on whether the user added a new widget in a row or cancel the add action.

{
    show: function(
        selectCallback: (name, width, title) => Promise[()],
        cancelCallback: () => ()
    )
}

You can get a default catalog object at Portal.ChooseWidgetPopup.

The source can be found here