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Diffstat (limited to 'src/qmlmodels/qqmlchangeset_p.h')
| -rw-r--r-- | src/qmlmodels/qqmlchangeset_p.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/qmlmodels/qqmlchangeset_p.h b/src/qmlmodels/qqmlchangeset_p.h new file mode 100644 index 0000000000..5b44d2958c --- /dev/null +++ b/src/qmlmodels/qqmlchangeset_p.h @@ -0,0 +1,161 @@ +/**************************************************************************** +** +** 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 |