the `DEFAULT` meta-keyword still sounds more reliable (and understandable)
than the `Q_CLASSINFO("DefaultProperty", "foo")` (which is also
undocumented, I guess)Konstantin 2011/6/15 Stefan Majewsky <[email protected]> > On Wed, Jun 15, 2011 at 2:22 AM, <[email protected]> wrote: > > The notion of the "default" property is already covered by the USER > keyword in Q_PROPERTY. Is there any reason why QML doesn't simply use that > instead of requiring a separate DefaultProperty entry in the classinfo? The > relevant page on QML ("Extending QML Functionalities using C++") describes > the use of the DefaultProperty entry. Reading over this again, it really > does seem like an oversight that this was added instead of re-using the USER > property already available in the metaobject system. I suspect that this > classinfo feature could be phased out by supporting the DefaultProperty in > the classinfo if it is present, but fall back to the USER property if > DefaultProperty is not present. In Qt5, I'd then suggest dropping the > support for DefaultProperty. > > There is a difference. Consider a textbox. Like any widget (or QML > Item, for that matter), I would expect the DEFAULT property to be the > list of children widgets or items, because this is the natural choice > given QML's syntax. The USER property, on the other hand, is probably > "text", as with QLineEdit et al., since this is the main editable > property of the widget itself (as in Designer). It is also where > KConfigDialog wants to retrieve entered user data from (the other > major use of the user property, ask api.kde.org for > KConfigDialogManager for more info). > > As you see, there's quite a semantical difference in USER and DEFAULT > properties: The USER property is the main feature of the user > interaction with that object, while the DEFAULT property is best used > for establishing element hierarchies (in QML). > > Greetings > Stefan > _______________________________________________ > Qt5-feedback mailing list > [email protected] > http://lists.qt.nokia.com/mailman/listinfo/qt5-feedback >
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