1 | // Copyright (C) 2016 The Qt Company Ltd. |
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
3 | |
4 | #ifndef QQMLCHANGESET_P_H |
5 | #define QQMLCHANGESET_P_H |
6 | |
7 | // |
8 | // W A R N I N G |
9 | // ------------- |
10 | // |
11 | // This file is not part of the Qt API. It exists purely as an |
12 | // implementation detail. This header file may change from version to |
13 | // version without notice, or even be removed. |
14 | // |
15 | // We mean it. |
16 | // |
17 | |
18 | #include <QtCore/qdebug.h> |
19 | #include <QtCore/qvector.h> |
20 | #include <QtQmlModels/private/qtqmlmodelsglobal_p.h> |
21 | |
22 | QT_BEGIN_NAMESPACE |
23 | |
24 | class Q_QMLMODELS_PRIVATE_EXPORT QQmlChangeSet |
25 | { |
26 | public: |
27 | struct MoveKey |
28 | { |
29 | MoveKey() {} |
30 | MoveKey(int moveId, int offset) : moveId(moveId), offset(offset) {} |
31 | int moveId = -1; |
32 | int offset = 0; |
33 | }; |
34 | |
35 | // The storrage for Change (below). This struct is trivial, which it has to be in order to store |
36 | // it in a QV4::Heap::Base object. The Change struct doesn't add any storage fields, so it is |
37 | // safe to cast ChangeData to/from Change. |
38 | struct ChangeData |
39 | { |
40 | int index; |
41 | int count; |
42 | int moveId; |
43 | int offset; |
44 | }; |
45 | |
46 | struct Change: ChangeData |
47 | { |
48 | Change() { |
49 | index = 0; |
50 | count = 0; |
51 | moveId = -1; |
52 | offset = 0; |
53 | } |
54 | Change(int index, int count, int moveId = -1, int offset = 0) { |
55 | this->index = index; |
56 | this->count = count; |
57 | this->moveId = moveId; |
58 | this->offset = offset; |
59 | } |
60 | |
61 | bool isMove() const { return moveId >= 0; } |
62 | |
63 | MoveKey moveKey(int index) const { |
64 | return MoveKey(moveId, index - Change::index + offset); } |
65 | |
66 | int start() const { return index; } |
67 | int end() const { return index + count; } |
68 | }; |
69 | |
70 | QQmlChangeSet(); |
71 | QQmlChangeSet(const QQmlChangeSet &changeSet); |
72 | ~QQmlChangeSet(); |
73 | |
74 | QQmlChangeSet &operator =(const QQmlChangeSet &changeSet); |
75 | |
76 | const QVector<Change> &removes() const { return m_removes; } |
77 | const QVector<Change> &inserts() const { return m_inserts; } |
78 | const QVector<Change> &changes() const { return m_changes; } |
79 | |
80 | void insert(int index, int count); |
81 | void remove(int index, int count); |
82 | void move(int from, int to, int count, int moveId); |
83 | void change(int index, int count); |
84 | |
85 | void insert(const QVector<Change> &inserts); |
86 | void remove(const QVector<Change> &removes, QVector<Change> *inserts = nullptr); |
87 | void move(const QVector<Change> &removes, const QVector<Change> &inserts); |
88 | void change(const QVector<Change> &changes); |
89 | void apply(const QQmlChangeSet &changeSet); |
90 | |
91 | bool isEmpty() const { return m_removes.empty() && m_inserts.empty() && m_changes.isEmpty(); } |
92 | |
93 | void clear() |
94 | { |
95 | m_removes.clear(); |
96 | m_inserts.clear(); |
97 | m_changes.clear(); |
98 | m_difference = 0; |
99 | } |
100 | |
101 | int difference() const { return m_difference; } |
102 | |
103 | private: |
104 | void remove(QVector<Change> *removes, QVector<Change> *inserts); |
105 | void change(QVector<Change> *changes); |
106 | |
107 | QVector<Change> m_removes; |
108 | QVector<Change> m_inserts; |
109 | QVector<Change> m_changes; |
110 | int m_difference; |
111 | }; |
112 | |
113 | Q_DECLARE_TYPEINFO(QQmlChangeSet::Change, Q_PRIMITIVE_TYPE); |
114 | Q_DECLARE_TYPEINFO(QQmlChangeSet::MoveKey, Q_PRIMITIVE_TYPE); |
115 | |
116 | inline size_t qHash(const QQmlChangeSet::MoveKey &key) { return qHash(key: qMakePair(value1: key.moveId, value2: key.offset)); } |
117 | inline bool operator ==(const QQmlChangeSet::MoveKey &l, const QQmlChangeSet::MoveKey &r) { |
118 | return l.moveId == r.moveId && l.offset == r.offset; } |
119 | |
120 | Q_QMLMODELS_PRIVATE_EXPORT QDebug operator <<(QDebug debug, const QQmlChangeSet::Change &change); |
121 | Q_QMLMODELS_PRIVATE_EXPORT QDebug operator <<(QDebug debug, const QQmlChangeSet &change); |
122 | |
123 | QT_END_NAMESPACE |
124 | |
125 | #endif |
126 | |