Different behavior in Qt5 and Qt6 with respect to QML files

[devil_coder]

I am trying to create 2 classes derived from QQuickItem (ParentItem and ChildItem). Both these quickitems have event handlers (mousePressEvent and mouseReleaseEvent) overridden from QQuickItem.

In QML, I am trying to create the quickitem as follows:

ParentItem{
    id: parentItem
    width: 300
    height: 300
    visible: true
    Rectangle {
        color: "yellow"
        anchors.fill: parent
        z: -1

       ChildItem{
           id: childItem
           width: 150
           height: 150
           visible: true
           Rectangle {
              color: "blue"
              anchors.fill: parent
           }
       }
    } 
}

If I click on the blue rectangle (ChildItem), the ParentItem's event handlers are triggered.

In Qt5, for the same project, the ChildItem's event handlers are triggered.
Is this a new behavior with Qt6? Or is it a bug with Qt6?

[TomZ]

@devil_coder any specific parts that cause this behavior? The z index comes to mind.

I'd love it if you can share your thoughts on the most detailed reason you deducted that caused this change.

Also, which Qt versions exactly?

[devil_coder]

@TomZ

Specifically, behavioral difference when clicked was the main reason why I am suspecting z order can be causing the issue.

The QT version used for Qt6 is Qt 6.5.2.
For Qt5, its Qt 5.15.9

[TomZ]

@devil_coder said in Different behavior in Qt5 and Qt6 with respect to QML files:

Specifically, behavioral difference when clicked was the main reason why I am suspecting z order can be causing the issue.

As you have the code, and we don't. Please confirm that by playing with the z index in that qml.

Please report back your findings.