Adding a new component definition in a class method to the scene

silex92

Hi,

there's a class woman. It is registered in QML system.
main.qml contains the object definition with a signal handler.
The handler calls c++ method which should add a new button into the scene.

I need to find the root object - the window in the main.qml to become a parent for the new button.
How do you find a root object?

Here's the method:
@
extern QQuickWindow *window;
void woman::add_hip()
{
setProperty("hip", 87);

QQmlEngine *engine = QtQml::qmlEngine(this);

// 1. Define a QML component.
QQmlComponent *readHipComp = new QQmlComponent(engine);
readHipComp->setData("import QtQuick.Controls 1.2\n\
                     Button {\n\
                         anchors.top: addHipBtn.top\n\
                         anchors.left: addHipBtn.left\n\
                         anchors.margins: 3\n\
                         text: \"Hip value\"\n\
                         onClicked: {\n\
                             msgDlg.text = woman.hip\n\
                             msgDlg.open()\n\
                         }\
                     }", QUrl());
// 2. Create the component instance.
QQuickItem *readHipBtn = qobject_cast<QQuickItem *>(readHipComp->create());
// 3. Add the instance to the scene.
readHipBtn->setParentItem(qobject_cast<QQuickItem *>(engine->rootContext()->contextObject()));

readHipBtn->setParentItem(window->contentItem());
}
@

throws
<Unknown File>: ReferenceError: addHipBtn is not defined
<Unknown File>: ReferenceError: addHipBtn is not defined.

It is added to GUI but it does not see other main.qml objects.

p3c0

Hi,

If I'm not mistaken you can pass the engine object to the class and then find the root object there.
@
//main.qml
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
}

//main.cpp
QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:///main.qml")));
QObject *rootObject= engine.rootObjects().first();
//rootObject will point to Window
@

In your case you can either pass rootObject to your class or pass engine to the class so that you can find root element there.