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# qregion.h

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

    /****************************************************************************
    ** $Id: qt/qregion.h   3.3.8   edited Jan 11 14:38 $
    **
    ** Definition of QRegion class
    **
    ** Created : 940514
    **
    ** Copyright (C) 1992-2007 Trolltech ASA.  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 ASA 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 QREGION_H
    #define QREGION_H

    #ifndef QT_H
    #include "qshared.h"
    #include "qrect.h"
    #endif // QT_H

    #ifdef Q_WS_X11
    struct QRegionPrivate;
    #endif

    class Q_EXPORT QRegion
    {
    public:
        enum RegionType { Rectangle, Ellipse };

        QRegion();
        QRegion( int x, int y, int w, int h, RegionType = Rectangle );
        QRegion( const QRect &, RegionType = Rectangle );
        QRegion( const QPointArray &, bool winding=FALSE );
        QRegion( const QRegion & );
        QRegion( const QBitmap & );
       ~QRegion();
        QRegion &operator=( const QRegion & );

        bool    isNull()   const;
        bool    isEmpty()  const;

        bool    contains( const QPoint &p ) const;
        bool    contains( const QRect &r )	const;

        void    translate( int dx, int dy );

        QRegion unite( const QRegion & )	const;
        QRegion intersect( const QRegion &) const;
        QRegion subtract( const QRegion & ) const;
        QRegion eor( const QRegion & )	const;

        QRect   boundingRect() const;
        QMemArray<QRect> rects() const;
        void setRects( const QRect *, int );

        const QRegion operator|( const QRegion & ) const;
        const QRegion operator+( const QRegion & ) const;
        const QRegion operator&( const QRegion & ) const;
        const QRegion operator-( const QRegion & ) const;
        const QRegion operator^( const QRegion & ) const;
        QRegion& operator|=( const QRegion & );
        QRegion& operator+=( const QRegion & );
        QRegion& operator&=( const QRegion & );
        QRegion& operator-=( const QRegion & );
        QRegion& operator^=( const QRegion & );

        bool    operator==( const QRegion & )  const;
        bool    operator!=( const QRegion &r ) const
    			{ return !(operator==(r)); }

    #if defined(Q_WS_WIN)
        HRGN    handle() const { return data->rgn; }
    #elif defined(Q_WS_X11)
        Region handle() const { if(!data->rgn) updateX11Region(); return data->rgn; }
    #elif defined(Q_WS_MAC)
        RgnHandle handle(bool require_rgn=FALSE) const;
    #elif defined(Q_WS_QWS)
        // QGfx_QWS needs this for region drawing
        void * handle() const { return data->rgn; }
    #endif

    #ifndef QT_NO_DATASTREAM
        friend Q_EXPORT QDataStream &operator<<( QDataStream &, const QRegion & );
        friend Q_EXPORT QDataStream &operator>>( QDataStream &, QRegion & );
    #endif
    private:
        QRegion( bool );
        QRegion copy() const;
        void    detach();
    #if defined(Q_WS_WIN)
        QRegion winCombine( const QRegion &, int ) const;
    #endif
    #if defined(Q_WS_X11)
        void updateX11Region() const;
        void *clipRectangles( int &num ) const;
        friend void *qt_getClipRects( const QRegion &, int & );
    #endif
        void    exec( const QByteArray &, int ver = 0 );
        struct QRegionData : public QShared {
    #if defined(Q_WS_WIN)
    	HRGN   rgn;
    #elif defined(Q_WS_X11)
    	Region rgn;
    	void *xrectangles;
    	QRegionPrivate *region;
    #elif defined(Q_WS_MAC)
    	uint is_rect:1;
    	QRect rect;
    	RgnHandle rgn;
    #elif defined(Q_WS_QWS)
    	void * rgn;
    #endif
    	bool   is_null;
        } *data;
    #if defined(Q_WS_MAC)
        friend struct qt_mac_rgn_data_cache;
        friend QRegionData *qt_mac_get_rgn_data();
        friend void qt_mac_free_rgn_data(QRegionData *);
        void rectifyRegion();
    #elif defined(Q_WS_WIN)
        friend class QETWidget;
    #endif

    };

    #define QRGN_SETRECT		1		// region stream commands
    #define QRGN_SETELLIPSE		2		//  (these are internal)
    #define QRGN_SETPTARRAY_ALT	3
    #define QRGN_SETPTARRAY_WIND	4
    #define QRGN_TRANSLATE		5
    #define QRGN_OR			6
    #define QRGN_AND		7
    #define QRGN_SUB		8
    #define QRGN_XOR		9
    #define QRGN_RECTS	       10

    /*****************************************************************************
      QRegion stream functions
     *****************************************************************************/

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

    #endif // QREGION_H