Eliminate Binding loop warning

[laszlo.gosztola]

Hello,

I have a sample code listed below. It works well, but always writes a debug message:
QML QDeclarativeRectangle_QML_0: Binding loop detected for property "parent"

Do anybode have any idea, how could I eliminate this warning?

import QtQuick 1.0
 
Rectangle {
    id: rect1
    color: "lightblue"
    width: 800
    height: 600
 
    Item {
        width: 600
        height: 600
 
        Rectangle {
            id: test
            parent: getRootObject()
            anchors.fill: parent
            color: "yellow"
            opacity: 0.5
 
            //! goes to the root object via the item's parent property
            function getRootObject() {
                var item = test.parent
                while (item.parent != undefined) {
                    item = item.parent
                    //console.log("w: "+ item.width + " h: " + item.height)
                }
                return item
            }
        }
    }
}

import QtQuick 1.0

Rectangle {
    id: rect1
    color: "lightblue"
    width: 800
    height: 600

    Item {
        width: 600
        height: 600

        Rectangle {
            id: test
            parent: getRootObject()
            anchors.fill: parent
            color: "yellow"
            opacity: 0.5

            //! goes to the root object via the item's parent property
            function getRootObject() {
                var item = test.parent
                while (item.parent != undefined) {
                    item = item.parent
                    //console.log("w: "+ item.width + " h: " + item.height)
                }
                return item
            }
        }
    }
}

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[wysota]

What's the point of what you are trying to do? Why not simply declare the object with a proper parent in the first place?

[laszlo.gosztola]

It's a MessageBox component. I have to fill the screen with a MouseArea to 'eat' the mouse click events.
There is a controller logic in QML which loads different QML files. But I want an universal messagebox, and not always really know, 'who' is the root object, that's why I wanted to use this approach.
Maybe I can solve simply returning from the C++ side a pointer of the rootObject, but I wanted to keep it in the QML side.

[wysota]

You can keep it in QML. Create the component on the fly when you need it and just put it on top of everything, you don't need to reparent it.

[laszlo.gosztola]

Do You have a sample how do you think? If I not reparent the item, then positioning will be strange. For example I have an info and a task bar at the upper and the lower parts of the screen. If I don't reparent the item and set x and y to 200, it will be relative to the parent item - the upper side of the screen or the lower. Or not?

[wysota]

If you create the item parentless, it will be working in scene (aka absolute) coordinates. Or you can declare it as a child of your root element and work in this element's coordinates.

However wouldn't it be simpler to make your message box modal simply by disabling all other mouse areas? You can do that with one property binding.