[Development] Why isn't FocusScope a property on Item?

[Giuseppe D'Angelo via Development]

Hi,







The *entire* implementation of FocusScope is exactly what one may think:

Something that I've always wondered about (and hopefully whose reasons have been lost in the Nokia times) is why FocusScope exists a dedicated item, rather than simply being an ordinary property on Item? Any custom QQuickItem subclass can be a FocusScope, it just needs to set a flag on itself. Why is the flag something only toggable from C++, rather than being a Q_PROPERTY?

QQuickFocusScope::QQuickFocusScope(QQuickItem *parent)
: QQuickItem(parent)
{
    setFlag(ItemIsFocusScope);
}

Thanks,
--
Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - The Qt, C++ and OpenGL Experts

What's the problem with this? It's just that one needing a focus scope in QML needs to introduce a new element in the tree. That is *super* annoying: it messes up sizing / anchoring, requires aliasing properties from FocusScope's contents, and so on. So, does anyone know the historical reasoning here, or any good reason for not changing FocusScope just a normal property on Item? (Note: I'm not opening the problem about whether a component/top level item in a QML file isn't automatically a focus scope -- that would lead to "interesting" complications of the language.)

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