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# qglist.h

This is the verbatim text of the qglist.h include file. It is provided only for illustration; the copyright remains with Trolltech.

    /****************************************************************************
    ** $Id: qt/src/tools/qglist.h   2.3.5   edited 2001-01-26 $
    **
    ** Definition of QGList and QGListIterator classes
    **
    ** Created : 920624
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the tools module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** 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.
    **
    ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
    ** licenses may use this file in accordance with the Qt Commercial License
    ** Agreement provided with the Software.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** 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.
    **
    **********************************************************************/

    #ifndef QGLIST_H
    #define QGLIST_H

    #ifndef QT_H
    #include "qcollection.h"
    #endif // QT_H

    /*****************************************************************************
      QLNode class (internal doubly linked list node)
     *****************************************************************************/

    class Q_EXPORT QLNode
    {
    friend class QGList;
    friend class QGListIterator;
    public:
        QCollection::Item getData() { return data; }
    private:
        QCollection::Item data;
        QLNode *prev;
        QLNode *next;
        QLNode( QCollection::Item d ) { data = d; }
    };

    /*****************************************************************************
      QGList class
     *****************************************************************************/

    class Q_EXPORT QGList : public QCollection      // doubly linked generic list
    {
    friend class QGListIterator;
    friend class QGVector;                          // needed by QGVector::toList
    public:
        uint  count() const;                        // return number of nodes

    #ifndef QT_NO_DATASTREAM
        QDataStream &read( QDataStream & );         // read list from stream
        QDataStream &write( QDataStream & ) const;  // write list to stream
    #endif
    protected:
        QGList();                                   // create empty list
        QGList( const QGList & );                   // make copy of other list
        virtual ~QGList();

        QGList &operator=( const QGList & );        // assign from other list
        bool operator==( const QGList& ) const;

        void inSort( QCollection::Item );           // add item sorted in list
        void append( QCollection::Item );           // add item at end of list
        bool insertAt( uint index, QCollection::Item ); // add item at i'th position
        void relinkNode( QLNode * );                // relink as first item
        bool removeNode( QLNode * );                // remove node
        bool remove( QCollection::Item = 0 );       // remove item (0=current)
        bool removeRef( QCollection::Item = 0 );    // remove item (0=current)
        bool removeFirst();                         // remove first item
        bool removeLast();                          // remove last item
        bool removeAt( uint index );                // remove item at i'th position
        QCollection::Item takeNode( QLNode * );     // take out node
        QCollection::Item take();                   // take out current item
        QCollection::Item takeAt( uint index );     // take out item at i'th pos
        QCollection::Item takeFirst();              // take out first item
        QCollection::Item takeLast();               // take out last item

        void sort();                        // sort all items;
        void clear();                       // remove all items

        int  findRef( QCollection::Item, bool = TRUE ); // find exact item in list
        int  find( QCollection::Item, bool = TRUE ); // find equal item in list

        uint containsRef( QCollection::Item ) const; // get number of exact matches
        uint contains( QCollection::Item )  const;  // get number of equal matches

        QCollection::Item at( uint index );         // access item at i'th pos
        int   at() const;                           // get current index
        QLNode *currentNode() const;                // get current node

        QCollection::Item get() const;              // get current item

        QCollection::Item cfirst() const;   // get ptr to first list item
        QCollection::Item clast()  const;   // get ptr to last list item
        QCollection::Item first();          // set first item in list curr
        QCollection::Item last();           // set last item in list curr
        QCollection::Item next();           // set next item in list curr
        QCollection::Item prev();           // set prev item in list curr

        void  toVector( QGVector * ) const;         // put items in vector

        virtual int compareItems( QCollection::Item, QCollection::Item );

    #ifndef QT_NO_DATASTREAM
        virtual QDataStream &read( QDataStream &, QCollection::Item & );
        virtual QDataStream &write( QDataStream &, QCollection::Item ) const;
    #endif
    private:
        void  prepend( QCollection::Item ); // add item at start of list

        void heapSortPushDown( QCollection::Item* heap, int first, int last );

        QLNode *firstNode;                          // first node
        QLNode *lastNode;                           // last node
        QLNode *curNode;                            // current node
        int     curIndex;                           // current index
        uint    numNodes;                           // number of nodes
        QGList *iterators;                          // list of iterators

        QLNode *locate( uint );                     // get node at i'th pos
        QLNode *unlink();                           // unlink node
    };

    inline uint QGList::count() const
    {
        return numNodes;
    }

    inline bool QGList::removeFirst()
    {
        first();
        return remove();
    }

    inline bool QGList::removeLast()
    {
        last();
        return remove();
    }

    inline int QGList::at() const
    {
        return curIndex;
    }

    inline QCollection::Item QGList::at( uint index )
    {
        QLNode *n = locate( index );
        return n ? n->data : 0;
    }

    inline QLNode *QGList::currentNode() const
    {
        return curNode;
    }

    inline QCollection::Item QGList::get() const
    {
        return curNode ? curNode->data : 0;
    }

    inline QCollection::Item QGList::cfirst() const
    {
        return firstNode ? firstNode->data : 0;
    }

    inline QCollection::Item QGList::clast() const
    {
        return lastNode ? lastNode->data : 0;
    }

    /*****************************************************************************
      QGList stream functions
     *****************************************************************************/

    #ifndef QT_NO_DATASTREAM
    Q_EXPORT QDataStream &operator>>( QDataStream &, QGList & );
    Q_EXPORT QDataStream &operator<<( QDataStream &, const QGList & );
    #endif

    /*****************************************************************************
      QGListIterator class
     *****************************************************************************/

    class Q_EXPORT QGListIterator                   // QGList iterator
    {
    friend class QGList;
    protected:
        QGListIterator( const QGList & );
        QGListIterator( const QGListIterator & );
        QGListIterator &operator=( const QGListIterator & );
       ~QGListIterator();

        bool  atFirst() const;                      // test if at first item
        bool  atLast()  const;                      // test if at last item
        QCollection::Item     toFirst();                            // move to first item
        QCollection::Item     toLast();                             // move to last item

        QCollection::Item     get() const;                          // get current item
        QCollection::Item     operator()();                         // get current and move to next
        QCollection::Item     operator++();                         // move to next item (prefix)
        QCollection::Item     operator+=(uint);                     // move n positions forward
        QCollection::Item     operator--();                         // move to prev item (prefix)
        QCollection::Item     operator-=(uint);                     // move n positions backward

    protected:
        QGList *list;                               // reference to list

    private:
        QLNode  *curNode;                           // current node in list
    };

    inline bool QGListIterator::atFirst() const
    {
        return curNode == list->firstNode;
    }

    inline bool QGListIterator::atLast() const
    {
        return curNode == list->lastNode;
    }

    inline QCollection::Item QGListIterator::get() const
    {
        return curNode ? curNode->data : 0;
    }

    #endif  // QGLIST_H