Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QABSTRACTITEMMODEL_P_H
+#define QABSTRACTITEMMODEL_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of QAbstractItemModel*.  This header file may change from version
+// to version without notice, or even be removed.
+//
+// We mean it.
+//
+//
+
+#include "private/qobject_p.h"
+#include "QtCore/qstack.h"
+#include "QtCore/qset.h"
+#include "QtCore/qhash.h"
+
+QT_BEGIN_NAMESPACE
+
+class Q_CORE_EXPORT QPersistentModelIndexData
+{
+public:
+    QPersistentModelIndexData() : model(0) {}
+    QPersistentModelIndexData(const QModelIndex &idx) : index(idx), model(idx.model()) {}
+    QModelIndex index;
+    QAtomicInt ref;
+    const QAbstractItemModel *model;
+    static QPersistentModelIndexData *create(const QModelIndex &index);
+    static void destroy(QPersistentModelIndexData *data);
+};
+
+class Q_CORE_EXPORT QAbstractItemModelPrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QAbstractItemModel)
+
+public:
+    QAbstractItemModelPrivate() : QObjectPrivate(), supportedDragActions(-1) {}
+    void removePersistentIndexData(QPersistentModelIndexData *data);
+    void rowsAboutToBeInserted(const QModelIndex &parent, int first, int last);
+    void rowsInserted(const QModelIndex &parent, int first, int last);
+    void rowsAboutToBeRemoved(const QModelIndex &parent, int first, int last);
+    void rowsRemoved(const QModelIndex &parent, int first, int last);
+    void columnsAboutToBeInserted(const QModelIndex &parent, int first, int last);
+    void columnsInserted(const QModelIndex &parent, int first, int last);
+    void columnsAboutToBeRemoved(const QModelIndex &parent, int first, int last);
+    void columnsRemoved(const QModelIndex &parent, int first, int last);
+    static QAbstractItemModel *staticEmptyModel();
+
+    inline QModelIndex createIndex(int row, int column, void *data = 0) const {
+        return q_func()->createIndex(row, column, data);
+    }
+
+    inline QModelIndex createIndex(int row, int column, int id) const {
+        return q_func()->createIndex(row, column, id);
+    }
+
+    inline bool indexValid(const QModelIndex &index) const {
+         return (index.row() >= 0) && (index.column() >= 0) && (index.model() == q_func());
+    }
+
+    inline void invalidatePersistentIndexes() {
+        foreach (QPersistentModelIndexData *data, persistent.indexes) {
+            data->index = QModelIndex();
+            data->model = 0;
+        }
+        persistent.indexes.clear();
+    }
+
+    /*!
+      \internal
+      clean the QPersistentModelIndex relative to the index if there is one.
+      To be used before an index is invalided
+      */
+    inline void invalidatePersistentIndex(const QModelIndex &index) {
+        QHash<QModelIndex, QPersistentModelIndexData *>::iterator it = persistent.indexes.find(index);
+        if(it != persistent.indexes.end()) {
+            QPersistentModelIndexData *data = *it;
+            persistent.indexes.erase(it);
+            data->index = QModelIndex();
+            data->model = 0;
+        }
+    }
+
+    struct Change {
+        Change() : first(-1), last(-1) {}
+        Change(const Change &c) : parent(c.parent), first(c.first), last(c.last) {}
+        Change(const QModelIndex &p, int f, int l) : parent(p), first(f), last(l) {}
+        QModelIndex parent;
+        int first, last;
+    };
+    QStack<Change> changes;
+
+    struct Persistent {
+        Persistent() {}
+        QHash<QModelIndex, QPersistentModelIndexData *> indexes;
+        QStack<QVector<QPersistentModelIndexData *> > moved;
+        QStack<QVector<QPersistentModelIndexData *> > invalidated;
+        void insertMultiAtEnd(const QModelIndex& key, QPersistentModelIndexData *data);
+    } persistent;
+
+    Qt::DropActions supportedDragActions;
+};
+
+QT_END_NAMESPACE
+
+#endif // QABSTRACTITEMMODEL_P_H