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# qsizepolicy.h

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

    /****************************************************************************
    ** $Id: qt/qsizepolicy.h   3.2.1   edited May 13 09:08 $
    **
    ** Definition of the QSizePolicy class
    **
    ** Created : 980929
    **
    ** Copyright (C) 1998-2000 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.
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    **********************************************************************/

    #ifndef QSIZEPOLICY_H
    #define QSIZEPOLICY_H

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

    // Documentation is in qabstractlayout.cpp.

    class Q_EXPORT QSizePolicy
    {
    private:
        enum { HSize = 6, HMask = 0x3f, VMask = HMask << HSize,
    	   MayGrow = 1, ExpMask = 2, MayShrink = 4 };
    public:
        enum SizeType { Fixed = 0,
    		    Minimum = MayGrow,
    		    Maximum = MayShrink,
    		    Preferred = MayGrow | MayShrink,
    		    MinimumExpanding = MayGrow | ExpMask,
    		    Expanding = MayGrow | MayShrink | ExpMask,
    		    Ignored = ExpMask /* magic value */ };

        enum ExpandData { NoDirection = 0,
    		      Horizontally = 1,
    		      Vertically = 2,
    #ifndef QT_NO_COMPAT
    		      Horizontal = Horizontally,
    		      Vertical = Vertically,
    #endif
    		      BothDirections = Horizontally | Vertically };

        QSizePolicy() : data( 0 ) { }

        QSizePolicy( SizeType hor, SizeType ver, bool hfw = FALSE )
    	: data( hor | (ver<<HSize) | (hfw ? (Q_UINT32)(1<<2*HSize) : 0) ) { }
        QSizePolicy( SizeType hor, SizeType ver, uchar hors, uchar vers, bool hfw = FALSE );

        SizeType horData() const { return (SizeType)( data & HMask ); }
        SizeType verData() const { return (SizeType)( (data & VMask) >> HSize ); }

        bool mayShrinkHorizontally() const { return horData() & MayShrink || horData() == Ignored; }
        bool mayShrinkVertically() const { return verData() & MayShrink || verData() == Ignored; }
        bool mayGrowHorizontally() const { return horData() & MayGrow || horData() == Ignored; }
        bool mayGrowVertically() const { return verData() & MayGrow || verData() == Ignored; }

        ExpandData expanding() const
        {
    	return (ExpandData)( (int)(verData() & ExpMask ? Vertically : 0) |
    			     (int)(horData() & ExpMask ? Horizontally : 0) );
        }

        void setHorData( SizeType d ) { data = (Q_UINT32)(data & ~HMask) | d; }
        void setVerData( SizeType d ) { data = (Q_UINT32)(data & ~(HMask << HSize)) |
    					   (d << HSize); }

        void setHeightForWidth( bool b ) { data = b ? (Q_UINT32)( data | ( 1 << 2*HSize ) )
    					      : (Q_UINT32)( data & ~( 1 << 2*HSize ) );  }
        bool hasHeightForWidth() const { return data & ( 1 << 2*HSize ); }

        bool operator==( const QSizePolicy& s ) const { return data == s.data; }
        bool operator!=( const QSizePolicy& s ) const { return data != s.data; }

        uint horStretch() const { return data >> 24; }
        uint verStretch() const { return (data >> 16) & 0xff; }
        void setHorStretch( uchar sf ) { data = (data&0x00ffffff) | (uint(sf)<<24); }
        void setVerStretch( uchar sf ) { data = (data&0xff00ffff) | (uint(sf)<<16); }
        inline void transpose();

    private:
        QSizePolicy( int i ) : data( (Q_UINT32)i ) { }

        Q_UINT32 data;
    };

    inline QSizePolicy::QSizePolicy( SizeType hor, SizeType ver, uchar hors, uchar vers, bool hfw )
        : data( hor | (ver<<HSize) | (hfw ? (Q_UINT32)(1<<2*HSize) : 0) ) {
        setHorStretch( hors );
        setVerStretch( vers );
    }

    inline void QSizePolicy::transpose() {
        *this = QSizePolicy( verData(), horData(), verStretch(), horStretch(),
    			 hasHeightForWidth() );
    }

    #endif // QSIZEPOLICY_H