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# qabstractlayout.h

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

    /****************************************************************************
    ** $Id: qt/src/kernel/qabstractlayout.h   2.3.1   edited 2001-01-26 $
    **
    ** Definition of the abstract layout base class
    **
    ** Created : 960416
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the kernel 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 QABSTRACTLAYOUT_H
    #define QABSTRACTLAYOUT_H

    #ifndef QT_H
    #include "qobject.h"
    #include "qsizepolicy.h"
    #include "qwidget.h"
    #endif // QT_H

    #ifndef QT_NO_LAYOUT

    class QMenuBar;
    class QWidget;
    struct QLayoutData;
    class QLayoutItem;
    class QLayout;
    class QSpacerItem;
    class QDomElement;
    class QConfigureLayoutEvent;

    class Q_EXPORT QGLayoutIterator : public QShared
    {
    public:
        virtual ~QGLayoutIterator();
        virtual QLayoutItem *next() = 0;
        virtual QLayoutItem *current() = 0;
        virtual QLayoutItem *takeCurrent() = 0;
    };

    class Q_EXPORT QLayoutIterator
    {
    public:
        QLayoutIterator( QGLayoutIterator *i ) :it(i) {}
        QLayoutIterator( const QLayoutIterator &i ) :it( i.it )
        { if ( it ) it->ref(); }
        ~QLayoutIterator() { if ( it && it->deref() ) delete it; }
        QLayoutIterator &operator=( const QLayoutIterator &i )
        {
            if ( i.it ) i.it->ref();
            if ( it && it->deref() ) delete it;
            it = i.it;
            return *this;
        }
        QLayoutItem *operator++() { return it ? it->next() : 0; }
        QLayoutItem *current() { return it ? it->current() : 0; }
        QLayoutItem *takeCurrent() { return it ? it->takeCurrent() : 0; }
        void deleteCurrent();
    private:
        QGLayoutIterator *it;
    };

    class Q_EXPORT QLayoutItem
    {
    public:
        QLayoutItem( int alignment = 0 ) :align(alignment) {}
        virtual ~QLayoutItem();
        virtual QSize sizeHint() const = 0;
        virtual QSize minimumSize() const = 0;
        virtual QSize maximumSize() const = 0;
        virtual QSizePolicy::ExpandData expanding() const =0;
        virtual void setGeometry( const QRect& ) = 0;
        virtual QRect geometry() const = 0;
        virtual bool isEmpty() const = 0;
        virtual bool hasHeightForWidth() const;
        virtual int heightForWidth( int ) const;
        virtual void invalidate();

        virtual QWidget *widget();
        virtual QLayoutIterator iterator();
        virtual QLayout *layout();
        virtual QSpacerItem *spacerItem();

        int alignment() const { return align; }
        virtual void setAlignment( int a );
    protected:
        int align;
    };

    class Q_EXPORT QSpacerItem : public QLayoutItem
    {
     public:
        QSpacerItem( int w, int h,
                     QSizePolicy::SizeType hData=QSizePolicy::Minimum,
                     QSizePolicy::SizeType vData= QSizePolicy::Minimum )
            :width(w), height(h), sizeP(hData, vData )
            {}
        void changeSize( int w, int h,
                    QSizePolicy::SizeType hData=QSizePolicy::Minimum,
                    QSizePolicy::SizeType vData=QSizePolicy::Minimum );
        QSize sizeHint() const ;
        QSize minimumSize() const ;
        QSize maximumSize() const ;
        QSizePolicy::ExpandData expanding() const;
        bool isEmpty() const;
        void setGeometry( const QRect& );
        QRect geometry() const;
        QSpacerItem *spacerItem();
    private:
        int width, height;
        QSizePolicy sizeP;
        QRect rect;
    };

    class Q_EXPORT QWidgetItem : public QLayoutItem
    {
    public:
        QWidgetItem( QWidget *w ) : wid(w) {}
        QSize sizeHint() const ;
        QSize minimumSize() const ;
        QSize maximumSize() const ;
        QSizePolicy::ExpandData expanding() const;
        bool isEmpty() const;
        void setGeometry( const QRect& ) ;
        QRect geometry() const;
        //void invalidate();
        virtual QWidget *widget();

        bool hasHeightForWidth() const;
        int heightForWidth( int ) const;

        const QSize &widgetSizeHint() const;

    private:
        //QSize cachedSizeHint;
        QWidget *wid;
    };

    class Q_EXPORT QLayout : public QObject, public QLayoutItem
    {
        Q_OBJECT
        Q_ENUMS( ResizeMode )
        Q_PROPERTY( int margin READ margin WRITE setMargin )
        Q_PROPERTY( int spacing READ spacing WRITE setSpacing )
        Q_PROPERTY( ResizeMode resizeMode READ resizeMode WRITE setResizeMode )

    public:
        QLayout( QWidget *parent, int margin=0, int space=-1,
                 const char *name=0 );
        QLayout( QLayout *parentLayout, int space=-1, const char *name=0 );
        QLayout( int space=-1, const char *name=0 );

        ~QLayout();

        int margin() const { return outsideBorder; }
        int spacing() const { return insideSpacing; }

        virtual void setMargin( int );
        virtual void setSpacing( int );

        enum { unlimited = QWIDGETSIZE_MAX };
    #if 1 //OBSOLETE
        int defaultBorder() const { return insideSpacing; }
        void freeze( int w, int h );
        void freeze() { setResizeMode( Fixed ); }
    #endif

        enum ResizeMode { FreeResize, Minimum, Fixed };
        void setResizeMode( ResizeMode );
        ResizeMode resizeMode() const;

    #ifndef QT_NO_MENUBAR
        virtual void  setMenuBar( QMenuBar *w );
        QMenuBar *menuBar() const { return menubar; }
    #endif

        QWidget *mainWidget();
        bool isTopLevel() const { return topLevel; }

        virtual void setAutoAdd( bool );
        bool autoAdd() const { return autoNewChild; }

        void invalidate();
        QRect geometry() const;
        bool activate();

        void add( QWidget *w ) { addItem( new QWidgetItem( w ) ); }
        virtual void addItem ( QLayoutItem * ) = 0;

        QSizePolicy::ExpandData expanding() const;
        QSize minimumSize() const;
        QSize maximumSize() const;
        void setGeometry( const QRect& )=0;
        QLayoutIterator iterator()=0;
        bool isEmpty() const;

        int totalHeightForWidth( int w ) const;
        QSize totalMinimumSize() const;
        QSize totalMaximumSize() const;
        QSize totalSizeHint() const;
        QLayout *layout();

        bool supportsMargin() const { return marginImpl; }

        void setEnabled( bool );
        bool isEnabled() const;

    protected:
        bool  eventFilter( QObject *, QEvent * );
        void addChildLayout( QLayout *l );
        void deleteAllItems();

        void setSupportsMargin( bool );
        QRect alignmentRect( const QRect& ) const;
    private:
        void setWidgetLayout( QWidget *, QLayout * );
        void init();
        int insideSpacing;
        int outsideBorder;
        uint topLevel : 1;
        uint autoMinimum : 1;
        uint autoNewChild : 1;
        uint frozen : 1;
        uint activated : 1;
        uint marginImpl : 1;
        uint enabled : 1;
        QRect rect;
        QLayoutData *extraData;
    #ifndef QT_NO_MENUBAR
        QMenuBar *menubar;
    #endif
    private:        // Disabled copy constructor and operator=
    #if defined(Q_DISABLE_COPY)
        QLayout( const QLayout & );
        QLayout &operator=( const QLayout & );
    #endif

    };

    inline void QLayoutIterator::deleteCurrent()
    {
        delete takeCurrent();
    }
    #endif //QT_NO_LAYOUT
    #endif