Revision control
Copy as Markdown
// Copyright (C) 2026 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
import QtQuick
import QtQuick.Window
// Used by tst_QQmlPreview::inPlaceRequiredPropertyDelegateCrash.
//
// Changing clip: true → false triggers a rebuildObject() on the ListView.
// stashExternalState() discovers the currentItem (an inline delegate whose
// compilationUnit matches the file's CU) via the QObject* currentItem property
// and creates a child context for it. The delegate has required properties
// (label, val) for which QQmlDelegateModel installed QQmlPropertyToPropertyBindings
// whose sourceObject is a QQmlDMListAccessorData. reset() then writes null to
// the model property, which causes QQmlDelegateModel to release all items and
// immediately delete the QQmlDMListAccessorData objects (ref-count → 0, not
// via deleteLater). restoreExternalState() later tries to re-install the stashed
// bindings, calling readSourceValue() with the now-dangling sourceObject → crash.
Window {
visible: true
width: 200
height: 200
ListView {
anchors.fill: parent
clip: true
model: ListModel {
ListElement { label: "A"; val: 1 }
ListElement { label: "B"; val: 2 }
ListElement { label: "C"; val: 3 }
}
delegate: Item {
required property string label
required property int val
width: ListView.view.width
height: 50
}
}
Timer {
repeat: true
interval: 200
running: true
onTriggered: console.log("required_prop_delegate ready")
}
}