Dynamically add QQuickView-based windows from c++ code and embed QObject

Avedis Zildjian

This is a question related to this one: https://forum.qt.io/topic/77907/right-way-to-dynamically-create-qml-windows
I tried to implement a prototype of multi-window system using dynamically created QQuickView-derived windows and I'm facing a problem with embedding c++ objects into qml.

Adding new window (for this test is called when button clicked in simple QMainWindow):

    MyWindow *window = new MyWindow(&engine);
    window->setSource(...);
    window->rootContext()->setContextProperty("window", window);
    window->show();

QML code:

import QtQuick.Controls 1.2

Button
{
    id: button
    property int i: 0
    anchors.fill: parent
    text: "press me!"
    onClicked: window.increment()
}

And this increment function to test code:

void MyWindow::increment()
{
    qDebug() << this << ++this->i;
}

My problem is, every time I create new window and call setContextProperty, property 'window' overwrites to the last window and in every window button click calls increment function from the last added window. How can I pass separate QObject to each instance of QQuickView using setContextProperty?

Avedis Zildjian

I found some kind of workaround that helps me with it, but I'm not sure if it is very smooth solution. Here is a new code for window creation:

    QQmlEngine *engine = new QQmlEngine;
    MyWindow *window = new MyWindow (engine);
    window->setSource(...);
    window->rootContext()->setContextProperty("window", window);
    window->show();

With this each window is associated with the correspondng QObject. But is it a good solution - to create separate QQmlEngine for each window?