Accessing qml objects from loaded qml using cpp code - c++

Question

I have a main.qml which loads Page1.qml using loaders. How can I find object 'whiteArea' within Page1.qml from my cpp code?
I am currently using the following to fetch an object and would like to obtain the loaded qml as well like this as well.
QObject * object = engine.rootObjects().at(0)->findChild<QObject *> ("yourObjectName");
main.qml
import QtQuick 2.3
import QtQuick.Controls 1.2
import myplugin 1.0
ApplicationWindow {
id:app
visible: true
width: 640
height: 480
title: qsTr(" World")
objectName: "Appwindow"
property ApplicationWindow appwindow:app
Label {
objectName: "label"
text: qsTr(" World")
anchors.centerIn: parent
}
MyItemTest{
objectName: "myItem"
anchors.fill: parent
}
Rectangle{
objectName: "Rectangle"
id:rect
width: 50
height: 50
color: "yellow"
}
Button {
objectName: "MyButton"
id: btnClick
text : "btn"
Loader { id: pageLoader }
onClicked: {
pageLoader.source = "Page1.qml"
}
}
}
Page1.qml
import QtQuick 2.0
import QtQuick 2.3
import QtQuick.Controls 1.2
import myplugin 1.0
Item {
Rectangle{
objectName: "whiteArea"
id:rect
width: 50
height: 50
color: "white"
}
}

Answer 1

From the Qt documentation:
The loaded object can be accessed using the item property.
So you should do some subsearch inside a loaded item, for example like this:
QObject * loader = engine.rootObjects().at(0)->findChild<QObject*>("loader");
qWarning() << loader;
QObject * item = qvariant_cast<QObject*>(QQmlProperty::read(loader,"item"));
qWarning() << item;
QObject *whiteArea = item->findChild<QObject *>("whiteArea");
qWarning() << whiteArea;
The output:
QQuickLoader(0x24918240, name = "loader")
QQuickItem(0x24919740)
QQuickRectangle(0x24919728, name = "whiteArea")

Answer 2

First of all , give Loader an object name property, like "loader".
then be sure at the time you running the below code , loader.item is set with"Page1.qml" then do something like this:
QObject* loader = m_engine->rootObjects()[0]->findChild<QObject*>("loader");
QObject* page= qvariant_cast<QObject *>(loader->property("item"));
QObject* whiteArea = page->findChild<QObject*>("whiteArea");