1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2015 The Qt Company Ltd. 4 ** Contact: http://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtCore module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see http://www.qt.io/terms-conditions. For further 15 ** information use the contact form at http://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 2.1 or version 3 as published by the Free 20 ** Software Foundation and appearing in the file LICENSE.LGPLv21 and 21 ** LICENSE.LGPLv3 included in the packaging of this file. Please review the 22 ** following information to ensure the GNU Lesser General Public License 23 ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and 24 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. 25 ** 26 ** As a special exception, The Qt Company gives you certain additional 27 ** rights. These rights are described in The Qt Company LGPL Exception 28 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. 29 ** 30 ** GNU General Public License Usage 31 ** Alternatively, this file may be used under the terms of the GNU 32 ** General Public License version 3.0 as published by the Free Software 33 ** Foundation and appearing in the file LICENSE.GPL included in the 34 ** packaging of this file. Please review the following information to 35 ** ensure the GNU General Public License version 3.0 requirements will be 36 ** met: http://www.gnu.org/copyleft/gpl.html. 37 ** 38 ** $QT_END_LICENSE$ 39 ** 40 ****************************************************************************/ 41 42 #ifndef QABSTRACTITEMMODEL_P_H 43 #define QABSTRACTITEMMODEL_P_H 44 45 // 46 // W A R N I N G 47 // ------------- 48 // 49 // This file is not part of the Qt API. It exists for the convenience 50 // of QAbstractItemModel*. This header file may change from version 51 // to version without notice, or even be removed. 52 // 53 // We mean it. 54 // 55 // 56 57 #include "private/qobject_p.h" 58 #include "QtCore/qstack.h" 59 #include "QtCore/qset.h" 60 #include "QtCore/qhash.h" 61 62 QT_BEGIN_NAMESPACE 63 64 class QPersistentModelIndexData 65 { 66 public: QPersistentModelIndexData()67 QPersistentModelIndexData() : model(0) {} QPersistentModelIndexData(const QModelIndex & idx)68 QPersistentModelIndexData(const QModelIndex &idx) : index(idx), model(idx.model()) {} 69 QModelIndex index; 70 QAtomicInt ref; 71 const QAbstractItemModel *model; 72 static QPersistentModelIndexData *create(const QModelIndex &index); 73 static void destroy(QPersistentModelIndexData *data); 74 }; 75 76 class Q_CORE_EXPORT QAbstractItemModelPrivate : public QObjectPrivate 77 { Q_DECLARE_PUBLIC(QAbstractItemModel)78 Q_DECLARE_PUBLIC(QAbstractItemModel) 79 80 public: 81 QAbstractItemModelPrivate() : QObjectPrivate(), supportedDragActions(-1), roleNames(defaultRoleNames()) {} 82 void removePersistentIndexData(QPersistentModelIndexData *data); 83 void movePersistentIndexes(QVector<QPersistentModelIndexData *> indexes, int change, const QModelIndex &parent, Qt::Orientation orientation); 84 void rowsAboutToBeInserted(const QModelIndex &parent, int first, int last); 85 void rowsInserted(const QModelIndex &parent, int first, int last); 86 void rowsAboutToBeRemoved(const QModelIndex &parent, int first, int last); 87 void rowsRemoved(const QModelIndex &parent, int first, int last); 88 void columnsAboutToBeInserted(const QModelIndex &parent, int first, int last); 89 void columnsInserted(const QModelIndex &parent, int first, int last); 90 void columnsAboutToBeRemoved(const QModelIndex &parent, int first, int last); 91 void columnsRemoved(const QModelIndex &parent, int first, int last); 92 static QAbstractItemModel *staticEmptyModel(); 93 static bool variantLessThan(const QVariant &v1, const QVariant &v2); 94 95 void itemsAboutToBeMoved(const QModelIndex &srcParent, int srcFirst, int srcLast, const QModelIndex &destinationParent, int destinationChild, Qt::Orientation); 96 void itemsMoved(const QModelIndex &srcParent, int srcFirst, int srcLast, const QModelIndex &destinationParent, int destinationChild, Qt::Orientation orientation); 97 bool allowMove(const QModelIndex &srcParent, int srcFirst, int srcLast, const QModelIndex &destinationParent, int destinationChild, Qt::Orientation orientation); 98 99 inline QModelIndex createIndex(int row, int column, void *data = 0) const { 100 return q_func()->createIndex(row, column, data); 101 } 102 createIndex(int row,int column,int id)103 inline QModelIndex createIndex(int row, int column, int id) const { 104 return q_func()->createIndex(row, column, id); 105 } 106 indexValid(const QModelIndex & index)107 inline bool indexValid(const QModelIndex &index) const { 108 return (index.row() >= 0) && (index.column() >= 0) && (index.model() == q_func()); 109 } 110 invalidatePersistentIndexes()111 inline void invalidatePersistentIndexes() { 112 foreach (QPersistentModelIndexData *data, persistent.indexes) { 113 data->index = QModelIndex(); 114 data->model = 0; 115 } 116 persistent.indexes.clear(); 117 } 118 119 /*! 120 \internal 121 clean the QPersistentModelIndex relative to the index if there is one. 122 To be used before an index is invalided 123 */ invalidatePersistentIndex(const QModelIndex & index)124 inline void invalidatePersistentIndex(const QModelIndex &index) { 125 QHash<QModelIndex, QPersistentModelIndexData *>::iterator it = persistent.indexes.find(index); 126 if(it != persistent.indexes.end()) { 127 QPersistentModelIndexData *data = *it; 128 persistent.indexes.erase(it); 129 data->index = QModelIndex(); 130 data->model = 0; 131 } 132 } 133 134 struct Change { ChangeChange135 Change() : first(-1), last(-1) {} ChangeChange136 Change(const Change &c) : parent(c.parent), first(c.first), last(c.last), needsAdjust(c.needsAdjust) {} ChangeChange137 Change(const QModelIndex &p, int f, int l) : parent(p), first(f), last(l), needsAdjust(false) {} 138 QModelIndex parent; 139 int first, last; 140 141 142 // In cases such as this: 143 // - A 144 // - B 145 // - C 146 // - - D 147 // - - E 148 // - - F 149 // 150 // If B is moved to above E, C is the source parent in the signal and its row is 2. When the move is 151 // completed however, C is at row 1 and there is no row 2 at the same level in the model at all. 152 // The QModelIndex is adjusted to correct that in those cases before reporting it though the 153 // rowsMoved signal. 154 bool needsAdjust; 155 isValidChange156 bool isValid() { return first >= 0 && last >= 0; } 157 }; 158 QStack<Change> changes; 159 160 struct Persistent { PersistentPersistent161 Persistent() {} 162 QHash<QModelIndex, QPersistentModelIndexData *> indexes; 163 QStack<QVector<QPersistentModelIndexData *> > moved; 164 QStack<QVector<QPersistentModelIndexData *> > invalidated; 165 void insertMultiAtEnd(const QModelIndex& key, QPersistentModelIndexData *data); 166 } persistent; 167 168 Qt::DropActions supportedDragActions; 169 170 QHash<int,QByteArray> roleNames; 171 static const QHash<int,QByteArray> &defaultRoleNames(); 172 }; 173 174 QT_END_NAMESPACE 175 176 #endif // QABSTRACTITEMMODEL_P_H 177