/****************************************************************************
**
** Copyright (C) 1992-2005 Trolltech AS. All rights reserved.
**
** This file is part of the core module of the Qt Toolkit.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/

#ifndef QABSTRACTITEMMODEL_H
#define QABSTRACTITEMMODEL_H

#include <QtCore/qvariant.h>
#include <QtCore/qobject.h>

class QAbstractItemModel;
class QPersistentModelIndex;

class Q_CORE_EXPORT QModelIndex
{
    friend class QAbstractItemModel;
public:
    inline QModelIndex() : r(-1), c(-1), p(0), m(0) {}
    inline QModelIndex(const QModelIndex &other)
        : r(other.r), c(other.c), p(other.p), m(other.m) {}
    inline ~QModelIndex() { p = 0; m = 0; }
    inline int row() const { return r; }
    inline int column() const { return c; }
    inline void *internalPointer() const { return p; }
    inline qint64 internalId() const { return reinterpret_cast<qint64>(p); }
    inline QModelIndex parent() const;
    inline QModelIndex sibling(int row, int column) const;
    inline QModelIndex child(int row, int column) const;
    inline const QAbstractItemModel *model() const { return m; }
    inline bool isValid() const { return (r >= 0) && (c >= 0) && (m != 0); }
    inline bool operator==(const QModelIndex &other) const
        { return (other.r == r && other.c == c && other.p == p && other.m == m); }
    inline bool operator!=(const QModelIndex &other) const
        { return !(*this == other); }
private:
    inline QModelIndex(int row, int column, void *ptr, const QAbstractItemModel *model);
    int r, c;
    void *p;
    const QAbstractItemModel *m;
};
Q_DECLARE_TYPEINFO(QModelIndex, Q_MOVABLE_TYPE);

inline QModelIndex::QModelIndex(int arow, int acolumn, void *adata,
				const QAbstractItemModel *amodel)
    : r(arow), c(acolumn), p(adata), m(amodel) {}

#ifndef QT_NO_DEBUG_STREAM
Q_CORE_EXPORT QDebug operator<<(QDebug, const QModelIndex &);
#endif

class QPersistentModelIndexData;

class Q_CORE_EXPORT QPersistentModelIndex
{
public:
    QPersistentModelIndex();
    QPersistentModelIndex(const QModelIndex &index);
    QPersistentModelIndex(const QPersistentModelIndex &other);
    ~QPersistentModelIndex();
    bool operator<(const QPersistentModelIndex &other) const;
    bool operator==(const QPersistentModelIndex &other) const;
    QPersistentModelIndex &operator=(const QPersistentModelIndex &other);
    bool operator==(const QModelIndex &other) const;
    bool operator!=(const QModelIndex &other) const;
    QPersistentModelIndex &operator=(const QModelIndex &other);
    operator const QModelIndex&() const;
    int row() const;
    int column() const;
    void *internalPointer() const;
    qint64 internalId() const;
    QModelIndex parent() const;
    QModelIndex sibling(int row, int column) const;
    QModelIndex child(int row, int column) const;
    const QAbstractItemModel *model() const;
    bool isValid() const;
private:
    QPersistentModelIndexData *d;
#ifndef QT_NO_DEBUG_STREAM
    friend Q_CORE_EXPORT QDebug operator<<(QDebug, const QPersistentModelIndex &);
#endif
};
Q_DECLARE_TYPEINFO(QPersistentModelIndex, Q_MOVABLE_TYPE);

#ifndef QT_NO_DEBUG_STREAM
Q_CORE_EXPORT QDebug operator<<(QDebug, const QPersistentModelIndex &);
#endif

template<typename T> class QList;
typedef QList<QModelIndex> QModelIndexList;

class QMimeData;
class QAbstractItemModelPrivate;
template <class Key, class T> class QMap;


class Q_CORE_EXPORT QAbstractItemModel : public QObject
{
    Q_OBJECT

    friend class QPersistentModelIndexData;
public:

    explicit QAbstractItemModel(QObject *parent = 0);
    virtual ~QAbstractItemModel();

    bool hasIndex(int row, int column, const QModelIndex &parent = QModelIndex()) const;
    virtual QModelIndex index(int row, int column,
                              const QModelIndex &parent = QModelIndex()) const = 0;
    virtual QModelIndex parent(const QModelIndex &child) const = 0;

    inline QModelIndex sibling(int row, int column, const QModelIndex &idx) const
        { return index(row, column, parent(idx)); }

    virtual int rowCount(const QModelIndex &parent = QModelIndex()) const = 0;
    virtual int columnCount(const QModelIndex &parent = QModelIndex()) const = 0;
    virtual bool hasChildren(const QModelIndex &parent = QModelIndex()) const;

    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const = 0;
    virtual bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);

    virtual QVariant headerData(int section, Qt::Orientation orientation,
                                int role = Qt::DisplayRole) const;
    virtual bool setHeaderData(int section, Qt::Orientation orientation, const QVariant &value,
                               int role = Qt::EditRole);

    virtual QMap<int, QVariant> itemData(const QModelIndex &index) const;
    virtual bool setItemData(const QModelIndex &index, const QMap<int, QVariant> &roles);

    virtual QStringList mimeTypes() const;
    virtual QMimeData *mimeData(const QModelIndexList &indexes) const;
    virtual bool dropMimeData(const QMimeData *data, Qt::DropAction action,
                              int row, int column, const QModelIndex &parent);
    virtual Qt::DropActions supportedDropActions() const;

    virtual bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex());
    virtual bool insertColumns(int column, int count, const QModelIndex &parent = QModelIndex());
    virtual bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());
    virtual bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex());

    inline bool insertRow(int row, const QModelIndex &parent = QModelIndex());
    inline bool insertColumn(int column, const QModelIndex &parent = QModelIndex());
    inline bool removeRow(int row, const QModelIndex &parent = QModelIndex());
    inline bool removeColumn(int column, const QModelIndex &parent = QModelIndex());

    virtual void fetchMore(const QModelIndex &parent);
    virtual bool canFetchMore(const QModelIndex &parent) const;
    virtual Qt::ItemFlags flags(const QModelIndex &index) const;
    virtual void sort(int column, Qt::SortOrder order = Qt::AscendingOrder);
    virtual QModelIndex buddy(const QModelIndex &index) const;
    virtual QModelIndexList match(const QModelIndex &start, int role,
                                  const QVariant &value, int hits = 1,
                                  Qt::MatchFlags flags =
                                  Qt::MatchFlags(Qt::MatchStartsWith|Qt::MatchWrap)) const;
    virtual QSize span(const QModelIndex &index) const;

signals:
    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
    void headerDataChanged(Qt::Orientation orientation, int first, int last);
    void layoutChanged();

#ifndef Q_MOC_RUN
private: // can only be emitted by QAbstractItemModel
#endif
    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);

    void modelReset();

public slots:
    virtual bool submit();
    virtual void revert();

protected:
    QAbstractItemModel(QAbstractItemModelPrivate &dd, QObject *parent = 0);

    inline QModelIndex createIndex(int row, int column, void *data = 0) const;
    inline QModelIndex createIndex(int row, int column, int id) const;

    void encodeData(const QModelIndexList &indexes, QDataStream &stream) const;
    bool decodeData(int row, int column, const QModelIndex &parent, QDataStream &stream);

    void beginInsertRows(const QModelIndex &parent, int first, int last);
    void endInsertRows();

    void beginRemoveRows(const QModelIndex &parent, int first, int last);
    void endRemoveRows();

    void beginInsertColumns(const QModelIndex &parent, int first, int last);
    void endInsertColumns();

    void beginRemoveColumns(const QModelIndex &parent, int first, int last);
    void endRemoveColumns();

    void reset();

    void changePersistentIndex(const QModelIndex &from, const QModelIndex &to);
    
private:
    Q_DECLARE_PRIVATE(QAbstractItemModel)
    Q_DISABLE_COPY(QAbstractItemModel)
};

inline bool QAbstractItemModel::insertRow(int arow, const QModelIndex &aparent)
{ return insertRows(arow, 1, aparent); }
inline bool QAbstractItemModel::insertColumn(int acolumn, const QModelIndex &aparent)
{ return insertColumns(acolumn, 1, aparent); }
inline bool QAbstractItemModel::removeRow(int arow, const QModelIndex &aparent)
{ return removeRows(arow, 1, aparent); }
inline bool QAbstractItemModel::removeColumn(int acolumn, const QModelIndex &aparent)
{ return removeColumns(acolumn, 1, aparent); }

inline QModelIndex QAbstractItemModel::createIndex(int arow, int acolumn, void *adata) const
{ return QModelIndex(arow, acolumn, adata, this); }
inline QModelIndex QAbstractItemModel::createIndex(int arow, int acolumn, int aid) const
{ return QModelIndex(arow, acolumn, reinterpret_cast<void*>(aid), this); }

class Q_CORE_EXPORT QAbstractTableModel : public QAbstractItemModel
{
    Q_OBJECT

public:
    explicit QAbstractTableModel(QObject *parent = 0);
    ~QAbstractTableModel();

    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;

protected:
    QAbstractTableModel(QAbstractItemModelPrivate &dd, QObject *parent);

private:
    Q_DISABLE_COPY(QAbstractTableModel)
    QModelIndex parent(const QModelIndex &child) const;
    bool hasChildren(const QModelIndex &parent) const;
};

class Q_CORE_EXPORT QAbstractListModel : public QAbstractItemModel
{
    Q_OBJECT

public:
    explicit QAbstractListModel(QObject *parent = 0);
    ~QAbstractListModel();

    QModelIndex index(int row, int column = 0, const QModelIndex &parent = QModelIndex()) const;

protected:
    QAbstractListModel(QAbstractItemModelPrivate &dd, QObject *parent);

private:
    Q_DISABLE_COPY(QAbstractListModel)
    QModelIndex parent(const QModelIndex &child) const;
    int columnCount(const QModelIndex &parent) const;
    bool hasChildren(const QModelIndex &parent) const;
};

// inline implementations

inline QModelIndex QModelIndex::parent() const
{ return m ? m->parent(*this) : QModelIndex(); }

inline QModelIndex QModelIndex::sibling(int arow, int acolumn) const
{ return m ? m->index(arow, acolumn, m->parent(*this)) : QModelIndex(); }

inline QModelIndex QModelIndex::child(int arow, int acolumn) const
{ return m ? m->index(arow, acolumn, *this) : QModelIndex(); }

#endif // QABSTRACTITEMMODEL_H
