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/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QPROPERTYBINDING_P_H
#define QPROPERTYBINDING_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
#include <QtCore/qshareddata.h>
#include <QtCore/qscopedpointer.h>
#include <vector>
#include <functional>
#include "qproperty_p.h"
QT_BEGIN_NAMESPACE
class Q_CORE_EXPORT QPropertyBindingPrivate : public QSharedData
{
private:
friend struct QPropertyBasePointer;
using ObserverArray = std::array<QPropertyObserver, 4>;
// QSharedData is 4 bytes. Use the padding for the bools as we need 8 byte alignment below.
bool dirty = false;
bool updating = false;
bool hasStaticObserver = false;
QUntypedPropertyBinding::BindingEvaluationFunction evaluationFunction;
QPropertyObserverPointer firstObserver;
union {
ObserverArray inlineDependencyObservers;
struct {
void *staticObserver;
void (*staticObserverCallback)(void*);
};
};
QScopedPointer<std::vector<QPropertyObserver>> heapObservers;
void *propertyDataPtr = nullptr;
QPropertyBindingSourceLocation location;
QPropertyBindingError error;
QMetaType metaType;
public:
// public because the auto-tests access it, too.
size_t dependencyObserverCount = 0;
QPropertyBindingPrivate(const QMetaType &metaType, QUntypedPropertyBinding::BindingEvaluationFunction evaluationFunction,
const QPropertyBindingSourceLocation &location)
: evaluationFunction(std::move(evaluationFunction))
, inlineDependencyObservers() // Explicit initialization required because of union
, location(location)
, metaType(metaType)
{}
virtual ~QPropertyBindingPrivate();
void setDirty(bool d) { dirty = d; }
void setProperty(void *propertyPtr) { propertyDataPtr = propertyPtr; }
void setStaticObserver(void *observer, void (*callback)(void*))
{
if (observer) {
if (!hasStaticObserver) {
if (dependencyObserverCount > 0) {
if (!heapObservers)
heapObservers.reset(new std::vector<QPropertyObserver>());
for (int i = 0, end = qMin(dependencyObserverCount, inlineDependencyObservers.size()); i < end; ++i)
heapObservers->push_back(std::move(inlineDependencyObservers[i]));
}
inlineDependencyObservers.~ObserverArray();
}
hasStaticObserver = true;
staticObserver = observer;
staticObserverCallback = callback;
} else if (hasStaticObserver) {
hasStaticObserver = false;
new (&inlineDependencyObservers) ObserverArray();
for (int i = 0, end = qMin(dependencyObserverCount, inlineDependencyObservers.size()); i < end; ++i) {
inlineDependencyObservers[i] = std::move(heapObservers->back());
heapObservers->pop_back();
}
}
}
void prependObserver(QPropertyObserverPointer observer) {
observer.ptr->prev = const_cast<QPropertyObserver **>(&firstObserver.ptr);
firstObserver = observer;
}
QPropertyObserverPointer takeObservers()
{
auto observers = firstObserver;
firstObserver.ptr = nullptr;
return observers;
}
void clearDependencyObservers() {
if (!hasStaticObserver) {
for (size_t i = 0; i < inlineDependencyObservers.size(); ++i) {
QPropertyObserver empty;
qSwap(inlineDependencyObservers[i], empty);
}
}
if (heapObservers)
heapObservers->clear();
dependencyObserverCount = 0;
}
QPropertyObserverPointer allocateDependencyObserver() {
if (!hasStaticObserver && dependencyObserverCount < inlineDependencyObservers.size()) {
++dependencyObserverCount;
return {&inlineDependencyObservers[dependencyObserverCount - 1]};
}
++dependencyObserverCount;
if (!heapObservers)
heapObservers.reset(new std::vector<QPropertyObserver>());
return {&heapObservers->emplace_back()};
}
QPropertyBindingSourceLocation sourceLocation() const { return location; }
QPropertyBindingError bindingError() const { return error; }
QMetaType valueMetaType() const { return metaType; }
void unlinkAndDeref();
void markDirtyAndNotifyObservers();
bool evaluateIfDirtyAndReturnTrueIfValueChanged();
static QPropertyBindingPrivate *get(const QUntypedPropertyBinding &binding)
{ return binding.d.data(); }
};
QT_END_NAMESPACE
#endif // QPROPERTYBINDING_P_H
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