Qml current focused widget attached property

[ollie-dawes]

A few apis I found myself looking for recently were ways to get the current focused, hovered KDDockWidget from a QWIndow in a bindable manner. It would also be nice to be able to bind to the activeFocused KDDockWidget for when multiple windows are in play.

Imagine you have multiple dock widgets and multiple windows and want to know which dock widget is focused for each window so that you can dislay related information in the title bar. Currently there doesn't seem to be a good way to get this information but ideally you would be able to do something like:

import "qrc:/kddockwidgets/qtquick/views/qml/" as KDDW

KDDW.TitleBarBase {
    id: root
    ...
    readonly property KDDW.DockWidget focusedWIdget: root.Window.window.KDDW.focusedWIdget
    readonly property KDDW.DockWidget hoveredWIdget: root.Window.window.KDDW.hoveredWidget
    readonly property KDDW.DockWidget activeFocusedWidget: KDDW.activeFocusedWIdget
}