QmlBind: support bindable properties

This patch ensures that the QML Binding element can also save and restore
C++ bindings. Should QQuickItem's x and y property be ported to the new
property system, we'd need new test cases to verify that "old-style"
bindings are still handled correctly. This task is however left for the
change porting the properties.

Task-number: QTBUG-90493
Change-Id: I506ffa1060ff32a7d722214e5ccd469bdaa61ff8
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 55 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlbinding/WithBindableProperties.h b/tests/auto/qml/qqmlbinding/WithBindableProperties.h
new file mode 100644
index 0000000000..562b445df7
--- /dev/null
+++ b/tests/auto/qml/qqmlbinding/WithBindableProperties.h
@@ -0,0 +1,55 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef WithBindableProperties_H
+#define WithBindableProperties_H
+
+#include <QObject>
+#include <qqml.h>
+
+
+class WithBindableProperties : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(int a READ a WRITE setA BINDABLE bindableA)
+    Q_PROPERTY(int b READ b WRITE setB BINDABLE bindableB)
+
+public:
+    QProperty<int> m_a;
+    QProperty<int> m_b;
+    int a() {return m_a;}
+    int b() {return m_b;}
+    void setA(int val) {m_a = val;}
+    void setB(int val) {m_b = val;}
+    QBindable<int> bindableA() {return QBindable<int>(&m_a); }
+    QBindable<int> bindableB() {return QBindable<int>(&m_b); }
+};
+
+#endif
+