How to properly set a property of a Qml item via a QQuickView instance ?

LRDPRDX

Hi, Qt'ers !

I have three files:

BDialog.qml - item definition
BEditorDialog.qml - a BDialog with a buttons and checkbox
main.cpp - C++

The content is the following:

// main.cpp
#include <QApplication>
#include <QQuickView>
#include <QQmlApplicationEngine>
#include <QQmlContext>


class Controller : public QObject
{
    Q_OBJECT

    public slots:
        bool getStatus() { return true; }
};

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

    Controller controller;

    QQuickView view;
    view.setSource( QUrl::fromLocalFile( "qrc:/BEditorDialog.qml" ) );

    view.rootContext()->setContextProperty( "controller", QVariant::fromValue( &controller ) );
    view.rootContext()->setContextProperty( "buttonText", "Text" );

    view.show();
    return app.exec();
}

#include "main.moc"

//BDialog.qml

import QtQuick 2.6
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.3

Item {
    property QtObject controller
    property string buttonText
}

//BEditorDialog.qml

import QtQuick 2.6
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.3

BDialog {
    id: root

    RowLayout {
        CheckBox {
            text: "Check status"
            checked: root.controller.getStatus()
        }

        Button {
            text: root.buttonText
        }
    }
}

I compile and run this but the combobox isn't checked and there is no text on the button, also I have (obviously) got the error message:

qrc:/BEditorDialog.qml:11: TypeError: Cannot call method 'getStatus' of null

The problem disappears if I remove the root. prefix in the BEditorDialog.qml: root.controller -> controller together with the removing of property declaration from the BDialog.qml but I want to set a property of a "base" qml -- and not create a new one.

So could you give me a direction, I've read some documentation but haven't found a solution. I think this should be done via the setInitialProperties member function but I have only Qt 5.12.

Thank you in advance.

Platform: linux
Qt: 5.12

LRDPRDX

Here is the answer.

Drooke

@LRDPRDX

You haven't set the property for the loaded qml file.

You may be able to se it like this:

itemLoader.setSource("Test.qml", {"stringa1": "ScrivoStr1", "stringa2": "ScrivoStr2"})

Or in the parent qml set the property to the context property you configured in the backend.

Property QObject myObject: myObject

LRDPRDX

Here is the answer.