QQuickWidget and C++ interaction

c++, qquickwidget, qt

Solution

Give it a try:

view->rootContext()->setContextProperty("test", "some random text");

instead of

view->setProperty("test", 0);

`setProperty(name, val)` works if object has the property `name` defined as `Q_PROPERTY`.

It is possible to pass `QObject`-derived object as `view`'s context property:

class Controller : public QObject
{
    Q_OBJECT
    QString m_test;

public:
    explicit Controller(QObject *parent = 0);

    Q_PROPERTY(QString test READ test WRITE setTest NOTIFY testChanged)

    QDate test() const
    {
        return m_test;
    }

signals:

    void testChanged(QString arg);

public slots:

    void setTest(QDate arg)
    {
        if (m_test != arg) {
            m_test = arg;
            emit testChanged(arg);
        }
    }
};

Controller c;
view->rootContext()->setContextProperty("controller", &c);

Text {
        id: text
        width: mainWindow.width
        font.pixelSize: 20
        horizontalAlignment: Text.AlignHCenter
        verticalAlignment: Text.AlignVCenter
        text: controller.test
    }

Is it also possible to get the Text object in C++ and update its text?

In general, it doesn't seem to be the best approach -- `c++` code shouldn't be aware of presentation if it follows model-view pattern.

However it is possible as described here.

Problem

I am experiencing with the new QQuickWidget. How can I interact between the QQuickWidget and C++? C++ ``` QQuickWidget *view = new QQuickWidget(); view->setSource(QUrl::fromLocalFile("myqml.qml")); view->setProperty("test", 0); myLayout->addWidget(view); ``` QML ``` import QtQuick 2.1 Rectangle { id: mainWindow width: parent.width height: parent.height Text { id: text width: mainWindow.width font.pixelSize: 20 horizontalAlignment: Text.AlignHCenter verticalAlignment: Text.AlignVCenter text: test } } ``` `text: test` does not work: `ReferenceError: test is not defined` How can I give my QML file some properties via C++? Is it also possible to get the Text object in C++ and update its text?

Original source