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Creating QML elements at runtime

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  • K Offline
    K Offline
    kuschky
    wrote on 19 Oct 2011, 11:28 last edited by
    #1

    Hello, I have some already existing QObject based classes representing some data I want display as graphic in QML.

    For that I change my class defintion so that my classes now derived from QDeclarativeItem and providing a implementation for the paint method and make them accessible by qmlRegisterType.
    @
    class Car : public QDeclarativeItem
    {
    Q_OBJECT

    Q_PROPERTY(int wheels READ wheels WRITE setWheels NOTIFY wheelsChanged)
    

    ....

    }
    @
    I'm now able to embed these objects into QML:
    @
    Rectangle {
    car {
    id: car1
    wheels: 1
    }

    car {
    id: car2
    wheels: 1
    }
    }
    @
    That's fine and works.

    But is there a way to create those kinds of objects on the C++ side and add them on a dynamic way at runtime to a QML context or to replace an already existing QML element with them? What want to do is to add another Car Object / Element with id car3 or replace an existing Car element with a one created in C++?

    Thanks & best regards Michael

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    • D Offline
      D Offline
      dmcr
      wrote on 19 Oct 2011, 12:49 last edited by
      #2

      If the context that you associated to your QML contains an object car

      @ Q_PROPERTY(Car car READ getCarte WRITE setCar NOTIFY carChanged)@

      then when you update the object, the QML will be noticed
      with the event carChanged

      If you want many of them then you can use QDeclarativeListeProperty.

      dmcr

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      • D Offline
        D Offline
        drixs
        wrote on 16 Nov 2011, 20:22 last edited by
        #3

        if i have QML declarations lets say Book.qml and Paper.qml, and i have set Book.qml as QDeclarativeView source.

        how i can create and store some "paper" as child of "Book" on the C++ side at runtime?
        thanks in advance :D

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        • D Offline
          D Offline
          diro
          wrote on 17 Nov 2011, 02:07 last edited by
          #4

          Two solutions for add object to QML context:

          1. QDeclarativeContext::setContextProperty()
            "http://doc.qt.nokia.com/stable/qdeclarativecontext.html":http://doc.qt.nokia.com/stable/qdeclarativecontext.html

          2. QDeclarativePropertyMap class
            "http://doc.qt.nokia.com/4.7-snapshot/qdeclarativepropertymap.html":http://doc.qt.nokia.com/4.7-snapshot/qdeclarativepropertymap.html

          The method 1 is good for few objects, and method 2 is good for object array.

          For your case, if you want to the car(s) display in the Rectangle dynamically, I think "DataModel":http://doc.qt.nokia.com/latest/qdeclarativemodels.html#exposing-c-data-models-to-qml + "ListView":http://doc.qt.nokia.com/4.7-snapshot/qml-listview.html element would be the best solution.

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