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Details

Type: Bug
Resolution: Fixed
Priority: P1: Critical
Fix Version/s: 6.8.0 FF
Affects Version/s: 6.6.2, 6.7
Component/s: Quick: Core Declarative QML
Labels:
None

Platform/s:

All
Commits:
27b404106 (dev), 12d025ca7 (6.7)

Description

The example code below shows a horizontal list and a footer item (green rectangle). The footer is vertically centered in Qt 6.6.1. With 6.6.2 it is the vertical position is unchanged (i.e. y = 0).

Same behaviour when using anchoring to the verticalCenter (commented line), so works fine on 6.6.1 and not at all on 6.6.2. It even outputs an error in the latter:

qrc:/sandbox/Main.qml:31:21: QML Rectangle: Possible anchor loop detected on vertical anchor.

However, it is unclear why it should loop.

We could observer this behaviour with Linux desktop and webassembly builds, so it is likely to happen on all platforms.

import QtQuick
import QtQuick.Window

Window {
    id: win
    width: 640
    height: 480
    visible: true
    title: 'sandbox'

    Item {
        anchors.fill: parent

        Rectangle {
            anchors.fill: list
            border.width: 1
            border.color: 'blue'
        }

        ListView {
            id: list
            height: 60
            spacing: 20
            orientation: ListView.Horizontal
            anchors {
                left: parent.left
                right: parent.right
                verticalCenter: parent.verticalCenter
            }

            footer: Rectangle {
                // anchors.verticalCenter: parent?.verticalCenter
                y: 15
                color: 'lime'
                width: 30
                height: 30
            }

            model: 3
            delegate: Text {
                text: 'Foobar'
                verticalAlignment: Text.AlignVCenter
                anchors {
                    top: parent?.top
                    bottom: parent?.bottom
                }
            }
        }
    }
}