How to have transition animations when using QML ListView and C ++ QList <QObject *>?

Question

I use QtQuick 2.0 and QML ListView, which I connected to my model in C ++ (QList of Objects). The connection was made through QQmlContext :: setContextProperty ().

Now the documentation said that the interface does not have a direct way to learn about the changes, so I only updated the context whenever I changed my model. However, when I do this, the view acts directly, without triggering any event (for example, add or remove events), which annoys me a bit because I cannot control any transitions.

Simply put, this is my qml code:

ListView {
id : list
        boundsBehavior: Flickable.StopAtBounds

        anchors {
            top: titleBar.bottom
            topMargin: -1
            bottom: mainWindow.bottom
            bottomMargin: -1
        }
        width: mainWindow.width

        model: episodes
        delegate: Episode {
            id: myDelegate
            onShowClicked: episodes.append(episodes[index])
        }

        ScrollBar {
            flickable: list;
        }
    }

where Episode is my user delegate. It contains the following code:

ListView.onAdd: SequentialAnimation {
    PropertyAction { target: episodeDelegate; property: "height"; value: 0 }
    NumberAnimation { target: episodeDelegate; property: "height"; to: 80; duration: 250; easing.type: Easing.InOutQuad }
}

ListView.onRemove: SequentialAnimation {
    PropertyAction { target: episodeDelegate; property: "ListView.delayRemove"; value: true }
    NumberAnimation { target: episodeDelegate; property: "height"; to: 0; duration: 250; easing.type: Easing.InOutQuad }

    // Make sure delayRemove is set back to false so that the item can be destroyed
    PropertyAction { target: episodeDelegate; property: "ListView.delayRemove"; value: false }
}

which is a direct copy of the Qt examples.

, , QML.

- - ?

Answer 1

reset setContextProperty, populate. .

, , . :

class SomeList : public QObject
{
    Q_OBJECT
public:
    explicit SomeList(QObject *parent = 0);

    void Add(QString color, QString value)
    {
        emit addNew(color,value);
    }

signals:
    void addNew(QString data1,QString data2);
};

main.cpp :

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    engine.rootContext()->setContextProperty("cppInstance",new SomeList);

    return app.exec();
}

QML:

ListModel{
    id:someListModel
}

Rectangle{
    width: 600
    height: 600
    ListView{
        model:someListModel
        delegate:Rectangle{
            width: parent.width
            height: parent.height/10
            color: model.color
            Text{
                text: value
            } 
        }
    }
    Connections{
        target: cppInstance
        onAddNew: { someListModel.insert(0,{"color":data1,"value":data2})}
    } 
}

SomeList QList, , QML.