loading QML file as a component from C++ to QQmlApplicationEngine

[kafanti]

Hello everyone,

I am trying to load a qml file to my QQmlApplicationEngine. I guess, since the component is visual item(rect), somehow, engine does not render it.
Can someone please point me where am i missing?

Thank you.

Here is my sample code,

/* MyItem.qml */
import QtQuick 2.5
 
Rectangle {
    id: top
    property string str: "#FF0000"
    color: str
    width: 10
    height: 20
    Component.onCompleted: console.log("myitem ctor", width, height, x, y, visible, color);
}
 
/* main.qml */
import QtQuick 2.5
import QtQuick.Window 2.2
 
Window {
    visible: true
    id: root
 
    MouseArea {
        id: mouse
        anchors.fill: parent
        onClicked: {
            Qt.quit();
        }
    }
 
    Text {
        id: text
        text: qsTr("Hello World")
        anchors.centerIn: parent
    }
}
 
/* main.cpp */
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlComponent>
#include <QQmlEngine>
 
int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
 
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
 
    QQmlComponent component(&engine, QUrl(QStringLiteral("qrc:/MyItem.qml")));
 
    QObject *childItem = component.create();
    QList<QObject *> rootObjects = engine.rootObjects();
    QObject *parentItem = rootObjects.first();
 
    childItem->setParent(parentItem);
 
    QQmlEngine::setObjectOwnership(childItem, QQmlEngine::CppOwnership);
 
    return app.exec();
}

[p3c0]

@kafanti You need to set a visual parent using setParentItem. And this parent being the Window's invisible root item which you can get using contentItem. So something like this:

QQuickItem *parentItem = qvariant_cast<QQuickItem*>(rootObjects.first()->property("contentItem"));
childItem->setParentItem(parentItem); 

Also cast childItem to QQuickItem instead of QObject to get access to setParentItem.