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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml 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 QQMLCHANGESET_P_H
#define QQMLCHANGESET_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qdebug.h>
#include <QtCore/qvector.h>
#include <QtQmlModels/private/qtqmlmodelsglobal_p.h>
QT_BEGIN_NAMESPACE
class Q_QMLMODELS_PRIVATE_EXPORT QQmlChangeSet
{
public:
struct MoveKey
{
MoveKey() {}
MoveKey(int moveId, int offset) : moveId(moveId), offset(offset) {}
int moveId = -1;
int offset = 0;
};
// The storrage for Change (below). This struct is trivial, which it has to be in order to store
// it in a QV4::Heap::Base object. The Change struct doesn't add any storage fields, so it is
// safe to cast ChangeData to/from Change.
struct ChangeData
{
int index;
int count;
int moveId;
int offset;
};
struct Change: ChangeData
{
Change() {
index = 0;
count = 0;
moveId = -1;
offset = 0;
}
Change(int index, int count, int moveId = -1, int offset = 0) {
this->index = index;
this->count = count;
this->moveId = moveId;
this->offset = offset;
}
bool isMove() const { return moveId >= 0; }
MoveKey moveKey(int index) const {
return MoveKey(moveId, index - Change::index + offset); }
int start() const { return index; }
int end() const { return index + count; }
};
QQmlChangeSet();
QQmlChangeSet(const QQmlChangeSet &changeSet);
~QQmlChangeSet();
QQmlChangeSet &operator =(const QQmlChangeSet &changeSet);
const QVector<Change> &removes() const { return m_removes; }
const QVector<Change> &inserts() const { return m_inserts; }
const QVector<Change> &changes() const { return m_changes; }
void insert(int index, int count);
void remove(int index, int count);
void move(int from, int to, int count, int moveId);
void change(int index, int count);
void insert(const QVector<Change> &inserts);
void remove(const QVector<Change> &removes, QVector<Change> *inserts = nullptr);
void move(const QVector<Change> &removes, const QVector<Change> &inserts);
void change(const QVector<Change> &changes);
void apply(const QQmlChangeSet &changeSet);
bool isEmpty() const { return m_removes.empty() && m_inserts.empty() && m_changes.isEmpty(); }
void clear()
{
m_removes.clear();
m_inserts.clear();
m_changes.clear();
m_difference = 0;
}
int difference() const { return m_difference; }
private:
void remove(QVector<Change> *removes, QVector<Change> *inserts);
void change(QVector<Change> *changes);
QVector<Change> m_removes;
QVector<Change> m_inserts;
QVector<Change> m_changes;
int m_difference;
};
Q_DECLARE_TYPEINFO(QQmlChangeSet::Change, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(QQmlChangeSet::MoveKey, Q_PRIMITIVE_TYPE);
inline uint qHash(const QQmlChangeSet::MoveKey &key) { return qHash(qMakePair(key.moveId, key.offset)); }
inline bool operator ==(const QQmlChangeSet::MoveKey &l, const QQmlChangeSet::MoveKey &r) {
return l.moveId == r.moveId && l.offset == r.offset; }
Q_QMLMODELS_PRIVATE_EXPORT QDebug operator <<(QDebug debug, const QQmlChangeSet::Change &change);
Q_QMLMODELS_PRIVATE_EXPORT QDebug operator <<(QDebug debug, const QQmlChangeSet &change);
QT_END_NAMESPACE
#endif
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