How to open QML InfoBanner from C++

[aymen_ka]

Hi,
Please can someone tell me why when I call a QML function (openInfoBanner) from C++ it doesn't open the InfoBanner?

this is the code of my test app:

main.cpp

#include <QtGui/QApplication>
#include <QtDeclarative>
#include "qmlapplicationviewer.h"
#include "myclass.h"

Q_DECL_EXPORT int main(int argc, char *argv[])
{
    QScopedPointer<QApplication> app(createApplication(argc, argv));

    QmlApplicationViewer *viewer = new QmlApplicationViewer();

    viewer->setMainQmlFile(QLatin1String("qml/test022/main.qml"));
    viewer->showExpanded();

    MyClass myClass;
    myClass.openBanner("Hello Banner");

    return app->exec();
}

myclass.h

#ifndef MYCLASS_H
#define MYCLASS_H

#include <Qt>
#include <QObject>
#include <QtDeclarative>
#include <QDeclarativeEngine>
#include <QDeclarativeContext>

class MyClass : public QObject
{
    Q_OBJECT
public:

    MyClass(){}

    Q_INVOKABLE void openBanner(QVariant txt){
        QDeclarativeEngine *engine = new QDeclarativeEngine;
        QDeclarativeComponent component(engine, QUrl::fromLocalFile("qml/test022/MainPage.qml"));
        if (component.status() == 1){
            QObject *object = component.create();
            QMetaObject::invokeMethod(object, "openInfoBanner", Q_ARG(QVariant, txt));
            object->deleteLater();
        }
        engine->deleteLater();
    }
};

#endif // MYCLASS_H

main.qml

import QtQuick 1.1
import com.nokia.symbian 1.1
import com.nokia.extras 1.1

PageStackWindow {
    id: window
    initialPage: mainPg
    showStatusBar: true
    showToolBar: true

    MainPage {
        id: mainPg
        parent: window
        tools: toolBarLayout
    }

    ToolBarLayout {
        id: toolBarLayout
        ToolButton {
            flat: true
            iconSource: "toolbar-back"
            onClicked: window.pageStack.depth <= 1 ? Qt.quit() : window.pageStack.pop()
        }
    }
}

MainPage.qml

import QtQuick 1.1
import com.nokia.symbian 1.1
import com.nokia.extras 1.1

Page {
    id: mainPage

    function openInfoBanner(txt){
        console.log("openInfoBanner(txt) executed") //this log msg is shown correctly
        textCenter.text = txt;
        infBanner.text = txt;
        infBanner.open();
        console.log("infBanner must been opened now!") //this log msg is shown correctly but the infBanner doesn't opened and
        //the textCenter text doesn't changed!
    }

    InfoBanner{
        id: infBanner
        timeout: 3000
    }

    Text {
        id: textCenter
        anchors.centerIn: parent
        text: qsTr("Hello world!")
        color: platformStyle.colorNormalLight
        font.pixelSize: 20
    }
}

[vineet.jain]

Does a log gets created at the beginning of the function openInfoBanner(txt)?

[aymen_ka]

Does a log gets created at the beginning of the function openInfoBanner(txt)?

Yes, it show both log "openInfoBanner(txt) executed" and "infBanner must been opened now!" but doesn't open the InfoBanner!
If I call the function openInfoBanner(txt) from QML it open the banner without problem, but when I call the function from C++ it doesn't open the banner!

[vineet.jain]

Just for the test purpose, try implementing something else in that function, let say change the text of a button & see if it works. This way you may know that problem is there in calling the method from c++ or the infobanner.Open() works like that only.

[aymen_ka]

Just for the test purpose, try implementing something else in that function, let say change the text of a button & see if it works. This way you may know that problem is there in calling the method from c++ or the infobanner.Open() works like that only.

Tried that and it doesn't change the text too! it only show logs. Any idea to resolve this problem?

[vineet.jain]

what does QMetaObject::invokeMethod returns? is it true or false?

[aymen_ka]

what does QMetaObject::invokeMethod returns? is it true or false?

it return true

[aymen_ka]

Any idea how to resolve this issue?