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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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 <QtQmlIntegration/qqmlintegration.h>
#include <QtCore/qdebug.h>
#include <QtCore/qvector.h>
#include <QtQmlModels/private/qtqmlmodelsglobal_p.h>
QT_BEGIN_NAMESPACE
class Q_QMLMODELS_EXPORT QQmlChangeSet
{
Q_GADGET
QML_ANONYMOUS
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 size_t 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_EXPORT QDebug operator <<(QDebug debug, const QQmlChangeSet::Change &change);
Q_QMLMODELS_EXPORT QDebug operator <<(QDebug debug, const QQmlChangeSet &change);
QT_END_NAMESPACE
#endif
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