ubuntu-phone team mailing list archive

[Николай Шатохин <n.shatokhin@xxxxxxxxx>]

0_o. I didn't know that all objects in QML are global. Thank you very much.


2013/9/30 <mrqtros@xxxxxxxxx>

> Omg declare global engine object in main qml file and that's all
>
> 30.09.13 13:19 Николай Шатохин написал(а):
> I'm using qmlRegisterType now. I have problems, because two QML objects in
> different QML files it is two different objects in C++. I registered as
> type class that have static object of Engine, but now I have butthurt with
> it (I need retranslate all signals, getters and setters)
>
>
> 2013/9/30 Michael Zanetti <michael.zanetti@xxxxxxxxxxxxx>
>
>> On Monday 30 September 2013 12:05:03 Николай Шатохин wrote:
>> > Can I set only one object as context property that contains other
>> objects
>> > (and this objects contain objects too) and get this deep objects in QML?
>> >
>> > For i.e. I have object of class Engine that has object of class Game,
>> Game
>> > contains object of Ship and Ship contains object of Reactor. So, I set
>> > object of Engine as context property and in QML write:
>> >
>> > engine.game.ship.reactor
>> >
>> > Can I use it?
>>
>>
>> Yes, given that "game" is a Q_PROPERTY() of "enigne", "ship" is a
>> Q_PROPERTY()
>> of "game" etc...
>>
>> Still, I recommend to register the type of the Engine instead of setting
>> it as
>> a context property.
>>
>> It's really just using qmlRegisterType() instead of setContextProperty().
>> It's
>> not more or more complex code, but gives you better ways of structuring
>> your
>> QML code.
>>
>> >
>> >
>> > 2013/9/30 Николай Шатохин <n.shatokhin@xxxxxxxxx>
>> >
>> > > I've already found this solution:
>> > >
>> http://qt-project.org/doc/qt-5.0/qtqml/qtqml-cppintegration-contextpropert
>> > > ies.html It helps. Thanks.
>> > >
>> > >
>> > > 2013/9/30 Michael Zanetti <michael.zanetti@xxxxxxxxxxxxx>
>> > >
>> > >> On Sunday 29 September 2013 13:45:01 Vladimir M. wrote:
>> > >> > Sounds like a "context property" use case (you plain set a QObject
>> as a
>> > >> > context property for a view's root scope, w/o even registering the
>> > >>
>> > >> object's
>> > >>
>> > >> > type, and all its properties and invokables become available).
>> > >>
>> > >> I don't recommend using context properties. While they are useful for
>> > >> some
>> > >> cases, this one doesn't seem to be one of those. Using too many
>> global
>> > >> context
>> > >> properties can make the code very ugly to work with.
>> > >>
>> > >> You probably want to create something like this:
>> > >>
>> > >> class ViewController: public QObject
>> > >> {
>> > >>
>> > >>   Q_PROPERTY(QList<MyClass> viewObjects READ viewObjects NOTIFY
>> > >>
>> > >> viewObjectsChanged)
>> > >> ...
>> > >> QList<MyClass> viewObjects() const {
>> > >>
>> > >>   return objectList;
>> > >>
>> > >> }
>> > >> ...
>> > >> };
>> > >>
>> > >> qmlRegisterType<ViewController>(uri, 0, 1, "ViewController");
>> > >>
>> > >> Then in QML you can do something like this:
>> > >>
>> > >> ViewController {
>> > >>
>> > >>   id: viewController
>> > >>
>> > >> }
>> > >>
>> > >> Repeater {
>> > >>
>> > >>   model: viewController.viewObjects
>> > >>   MyView {
>> > >>
>> > >>     property var viewObject: viewController.viewObjects[index]
>> > >>
>> > >>   }
>> > >>
>> > >> }
>> > >>
>> > >>
>> > >> Note that if you want your code to adjust more flexible (i.e. the
>> > >> viewObjects
>> > >> change a lot), consider using a QAbstractListModel (or some other
>> model)
>> > >> instead of a QList.
>> > >>
>> > >> Hope this helps,
>> > >> Michael
>> > >>
>> > >> > On Sun, Sep 29, 2013 at 6:38 AM, Николай Шатохин
>> > >>
>> > >> <n.shatokhin@xxxxxxxxx>wrote:
>> > >> > > Hello.
>> > >> > >
>> > >> > > When I create a class in C++, I can register it for QML and can
>> > >> > > create
>> > >> > > view for it. It's very convenient. But, if I need many objects
>> of the
>> > >>
>> > >> same
>> > >>
>> > >> > > type, and need to show few views on screen, I got problems.
>> > >> > > Is it possible to register QML type for object, not for class?
>> > >> > > If I change some object, I need to see only its view changed.
>> > >> > >
>> > >> > > Best regard,
>> > >> > > Nick
>> > >> > >
>> > >> > > --
>> > >> > > Mailing list: https://launchpad.net/~ubuntu-phone
>> > >> > > Post to     : ubuntu-phone@xxxxxxxxxxxxxxxxxxx
>> > >> > > Unsubscribe : https://launchpad.net/~ubuntu-phone
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>>
>>
>
>