1 files changed, 141 insertions, 0 deletions
diff --git a/src/corelib/kernel/qpropertybinding.cpp b/src/corelib/kernel/qpropertybinding.cpp
new file mode 100644
index 0000000000..23f7075998
--- /dev/null
+++ b/src/corelib/kernel/qpropertybinding.cpp
@@ -0,0 +1,141 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** 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-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qpropertybinding_p.h"
+#include "qproperty_p.h"
+
+#include <QScopedValueRollback>
+
+QT_BEGIN_NAMESPACE
+
+using namespace QtPrivate;
+
+QPropertyBindingPrivate::~QPropertyBindingPrivate()
+{
+    if (firstObserver)
+        firstObserver.unlink();
+}
+
+void QPropertyBindingPrivate::unlinkAndDeref()
+{
+    propertyDataPtr = nullptr;
+    if (!ref.deref())
+        delete this;
+}
+
+void QPropertyBindingPrivate::markDirtyAndNotifyObservers()
+{
+    dirty = true;
+    if (firstObserver)
+        firstObserver.notify(this);
+}
+
+bool QPropertyBindingPrivate::evaluateIfDirtyAndReturnTrueIfValueChanged()
+{
+    if (!dirty)
+        return false;
+
+    if (updating) {
+        error = QPropertyBindingError(QPropertyBindingError::BindingLoop);
+        return false;
+    }
+
+    QScopedValueRollback<bool> updateGuard(updating, true);
+
+    BindingEvaluationState evaluationFrame(this);
+    bool changed = false;
+    auto result = evaluationFunction(/*version*/1, propertyDataPtr);
+    if (auto changedPtr = std::get_if<bool>(&result))
+        changed = *changedPtr;
+    else if (auto errorPtr = std::get_if<QPropertyBindingError>(&result))
+        error = std::move(*errorPtr);
+    dirty = false;
+    return changed;
+}
+
+QUntypedPropertyBinding::QUntypedPropertyBinding(QUntypedPropertyBinding::BindingEvaluationFunction function,
+                                                 const QPropertyBindingSourceLocation &location)
+{
+    d = new QPropertyBindingPrivate(std::move(function), std::move(location));
+}
+
+QUntypedPropertyBinding::QUntypedPropertyBinding(QUntypedPropertyBinding &&other)
+    : d(std::move(other.d))
+{
+}
+
+QUntypedPropertyBinding::QUntypedPropertyBinding(const QUntypedPropertyBinding &other)
+    : d(other.d)
+{
+}
+
+QUntypedPropertyBinding &QUntypedPropertyBinding::operator=(const QUntypedPropertyBinding &other)
+{
+    d = other.d;
+    return *this;
+}
+
+QUntypedPropertyBinding &QUntypedPropertyBinding::operator=(QUntypedPropertyBinding &&other)
+{
+    d = std::move(other.d);
+    return *this;
+}
+
+QUntypedPropertyBinding::QUntypedPropertyBinding(const QPropertyBindingPrivatePtr &priv)
+    : d(priv)
+{
+}
+
+QUntypedPropertyBinding::~QUntypedPropertyBinding()
+{
+}
+
+bool QUntypedPropertyBinding::isNull() const
+{
+    return !d;
+}
+
+QPropertyBindingError QUntypedPropertyBinding::error() const
+{
+    if (!d)
+        return QPropertyBindingError();
+    return d->error;
+}
+
+QT_END_NAMESPACE