c++ - How to access objectNames of objects in ApplicationWindow of QML?

Question

How to access objectName of children of ApplicationWindow?

With ApplicationWindow:

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

ApplicationWindow {
    id: head
    visible: true
    width: 640
    height: 480

    Rectangle{ height:1; width: 1; objectName: "AA"}
    Rectangle{ height:1; width: 1; objectName: "BB"}

    Component.onCompleted:
    {
        console.log("parent.data[0].objectName", head.data[0].objectName)
        console.log("parent.data[1].objectName", head.data[1].objectName)
    }
}

Output:

qml: parent.data[0].objectName ApplicationWindow
qml: parent.data[1].objectName 

---

With Window:

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

Window {
    id: head
    visible: true
    width: 640
    height: 480

    Rectangle{height:1; width: 1; objectName: "AA"}
    Rectangle{height:1; width: 1; objectName: "BB"}

    Component.onCompleted:
    {
        console.log("parent.data[0].objectName", head.data[0].objectName)
        console.log("parent.data[1].objectName", head.data[1].objectName)
    }
}

Output:

qml: parent.data[0].objectName AA
qml: parent.data[1].objectName BB

question from:https://stackoverflow.com/questions/65952407/how-to-access-objectnames-of-objects-in-applicationwindow-of-qml

Answer 1

Instead of data, we have to access contentData with respect to ApplicationWindow

Component.onCompleted:
    {
        console.log("parent.data[0].objectName", head.contentData[0].objectName)
        console.log("parent.data[1].objectName", head.contentData[1].objectName)
    }

From: https://doc.qt.io/qt-5/qml-qtquick-controls2-applicationwindow.html#contentData-prop

contentData : list

This default property holds the list of all objects declared as children of the window.

The data property allows you to freely mix visual children, resources and other windows in an ApplicationWindow.

If you assign an Item to the contentData list, it becomes a child of the window's contentItem, so that it appears inside the window. The item's parent will be the window's contentItem.

It should not generally be necessary to refer to the contentData property, as it is the default property for ApplicationWindow and thus all child items are automatically assigned to this property.