Float based shortcuts improvements

The shortcuts implementations of various dialogs are awesome and they need a set of variants for use in fullscreen apps.
I've implemented my own by essentially replicating the existing shortcuts each as a class that then wraps the dialog in a float and takes an argument for "parent_layout" like so:

class PopupRadioInput:
    def __init__(self, parent_layout=None,
                title="",
                text="",
                ok_text="Ok",
                cancel_text="Cancel",
                values=None,
                return_handler=None,
                ):

<snip>
    def show(self):
        self.parent_layout.container.floats.append(self.main_float)
        self.restore_focus_pointer = self.parent_layout.current_window
        self.parent_layout.focus(self.radio_list)

    def hide(self):
        self.parent_layout.container.floats.remove(self.main_float)
        self.parent_layout.focus(self.restore_focus_pointer)

I'd like to help contribute this back to the community but it's not clear if this is the desirable api format, taking a Layout object just seemed the easiest.
Before I submit this back as a PR: Is this the preferred API? or is there a better parent-ing that feels more natural you'd like to see?
@jonathanslenders could you please let me know your preference and I'd be happy to officially put together the PR?

Start by reviewing the existing shortcut implementations for dialogs and the proposed parent_layout, float, show, and hide behavior described in the issue. Confirm the preferred API with the maintainer before implementing anything. Done means an agreed design for fullscreen float-based dialog variants and, if accepted, a complete contribution using that API.