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# qwidget.h

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

    /****************************************************************************
    ** $Id: qt/qwidget.h   3.2.1   edited May 13 09:08 $
    **
    ** Definition of QWidget class
    **
    ** Created : 931029
    **
    ** Copyright (C) 1992-2003 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.
    **
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    **********************************************************************/

    #ifndef QWIDGET_H
    #define QWIDGET_H

    #ifndef QT_H
    #include "qwindowdefs.h"
    #include "qobject.h"
    #include "qpaintdevice.h"
    #include "qpalette.h"
    #include "qfont.h"
    #include "qfontmetrics.h"
    #include "qfontinfo.h"
    #include "qsizepolicy.h"
    #endif // QT_H

    class QLayout;
    struct QWExtra;
    struct QTLWExtra;
    class QFocusData;
    class QCursor;
    class QWSRegionManager;
    class QStyle;

    class Q_EXPORT QWidget : public QObject, public QPaintDevice
    {
        Q_OBJECT
        Q_ENUMS( BackgroundMode FocusPolicy BackgroundOrigin )
        Q_PROPERTY( bool isTopLevel READ isTopLevel )
        Q_PROPERTY( bool isDialog READ isDialog )
        Q_PROPERTY( bool isModal READ isModal )
        Q_PROPERTY( bool isPopup READ isPopup )
        Q_PROPERTY( bool isDesktop READ isDesktop )
        Q_PROPERTY( bool enabled READ isEnabled WRITE setEnabled )
        Q_PROPERTY( QRect geometry READ geometry WRITE setGeometry )
        Q_PROPERTY( QRect frameGeometry READ frameGeometry )
        Q_PROPERTY( int x READ x )
        Q_PROPERTY( int y READ y )
        Q_PROPERTY( QPoint pos READ pos WRITE move DESIGNABLE false STORED false )
        Q_PROPERTY( QSize frameSize READ frameSize )
        Q_PROPERTY( QSize size READ size WRITE resize DESIGNABLE false STORED false )
        Q_PROPERTY( int width READ width )
        Q_PROPERTY( int height READ height )
        Q_PROPERTY( QRect rect READ rect )
        Q_PROPERTY( QRect childrenRect READ childrenRect )
        Q_PROPERTY( QRegion childrenRegion READ childrenRegion )
        Q_PROPERTY( QSizePolicy sizePolicy READ sizePolicy WRITE setSizePolicy )
        Q_PROPERTY( QSize minimumSize READ minimumSize WRITE setMinimumSize )
        Q_PROPERTY( QSize maximumSize READ maximumSize WRITE setMaximumSize )
        Q_PROPERTY( int minimumWidth READ minimumWidth WRITE setMinimumWidth STORED false DESIGNABLE false )
        Q_PROPERTY( int minimumHeight READ minimumHeight WRITE setMinimumHeight STORED false DESIGNABLE false )
        Q_PROPERTY( int maximumWidth READ maximumWidth WRITE setMaximumWidth STORED false DESIGNABLE false )
        Q_PROPERTY( int maximumHeight READ maximumHeight WRITE setMaximumHeight STORED false DESIGNABLE false )
        Q_PROPERTY( QSize sizeIncrement READ sizeIncrement WRITE setSizeIncrement )
        Q_PROPERTY( QSize baseSize READ baseSize WRITE setBaseSize )
        Q_PROPERTY( BackgroundMode backgroundMode READ backgroundMode WRITE setBackgroundMode DESIGNABLE false )
        Q_PROPERTY( QColor paletteForegroundColor READ paletteForegroundColor WRITE setPaletteForegroundColor RESET unsetPalette )
        Q_PROPERTY( QColor paletteBackgroundColor READ paletteBackgroundColor WRITE setPaletteBackgroundColor RESET unsetPalette )
        Q_PROPERTY( QPixmap paletteBackgroundPixmap READ paletteBackgroundPixmap WRITE setPaletteBackgroundPixmap RESET unsetPalette )
        Q_PROPERTY( QBrush backgroundBrush READ backgroundBrush )
        Q_PROPERTY( QColorGroup colorGroup READ colorGroup )
        Q_PROPERTY( QPalette palette READ palette WRITE setPalette RESET unsetPalette  STORED ownPalette )
        Q_PROPERTY( BackgroundOrigin backgroundOrigin READ backgroundOrigin WRITE setBackgroundOrigin )
        Q_PROPERTY( bool ownPalette READ ownPalette )
        Q_PROPERTY( QFont font READ font WRITE setFont RESET unsetFont STORED ownFont )
        Q_PROPERTY( bool ownFont READ ownFont )
    #ifndef QT_NO_CURSOR
        Q_PROPERTY( QCursor cursor READ cursor WRITE setCursor RESET unsetCursor STORED ownCursor )
        Q_PROPERTY( bool ownCursor READ ownCursor )
    #endif
    #ifndef QT_NO_WIDGET_TOPEXTRA
        Q_PROPERTY( QString caption READ caption WRITE setCaption )
        Q_PROPERTY( QPixmap icon READ icon WRITE setIcon )
        Q_PROPERTY( QString iconText READ iconText WRITE setIconText )
    #endif
        Q_PROPERTY( bool mouseTracking READ hasMouseTracking WRITE setMouseTracking )
        Q_PROPERTY( bool underMouse READ hasMouse )
        Q_PROPERTY( bool isActiveWindow READ isActiveWindow )
        Q_PROPERTY( bool focusEnabled READ isFocusEnabled )
        Q_PROPERTY( FocusPolicy focusPolicy READ focusPolicy WRITE setFocusPolicy )
        Q_PROPERTY( bool focus READ hasFocus )
        Q_PROPERTY( bool updatesEnabled READ isUpdatesEnabled WRITE setUpdatesEnabled DESIGNABLE false )
        Q_PROPERTY( bool visible READ isVisible )
        Q_PROPERTY( QRect visibleRect READ visibleRect ) // obsolete
        Q_PROPERTY( bool hidden READ isHidden WRITE setHidden DESIGNABLE false SCRIPTABLE false )
        Q_PROPERTY( bool shown READ isShown WRITE setShown DESIGNABLE false SCRIPTABLE false )
        Q_PROPERTY( bool minimized READ isMinimized )
        Q_PROPERTY( bool maximized READ isMaximized )
        Q_PROPERTY( bool fullScreen READ isFullScreen )
        Q_PROPERTY( QSize sizeHint READ sizeHint )
        Q_PROPERTY( QSize minimumSizeHint READ minimumSizeHint )
        Q_PROPERTY( QRect microFocusHint READ microFocusHint )
        Q_PROPERTY( bool acceptDrops READ acceptDrops WRITE setAcceptDrops )
        Q_PROPERTY( bool autoMask READ autoMask WRITE setAutoMask DESIGNABLE false SCRIPTABLE false )
        Q_PROPERTY( bool customWhatsThis READ customWhatsThis )
        Q_PROPERTY( bool inputMethodEnabled READ isInputMethodEnabled WRITE setInputMethodEnabled DESIGNABLE false SCRIPTABLE false )

    public:
        Q_EXPLICIT QWidget( QWidget* parent=0, const char* name=0, WFlags f=0 );
        ~QWidget();

        WId		 winId() const;
        void	 setName( const char *name );
    #ifndef QT_NO_STYLE
        // GUI style setting

        QStyle     &style() const;
        void        setStyle( QStyle * );
        QStyle*	setStyle( const QString& );
    #endif
        // Widget types and states

        bool	 isTopLevel()	const;
        bool	 isDialog()	const;
        bool	 isPopup()	const;
        bool	 isDesktop()	const;
        bool	 isModal()	const;

        bool	 isEnabled()	const;
        bool	 isEnabledTo(QWidget*) const;
        bool	 isEnabledToTLW() const;

    public slots:
        virtual void setEnabled( bool );
        void setDisabled( bool );

        // Widget coordinates

    public:
        QRect	 frameGeometry() const;
        const QRect &geometry()	const;
        int		 x()		const;
        int		 y()		const;
        QPoint	 pos()		const;
        QSize	 frameSize()    const;
        QSize	 size()		const;
        int		 width()	const;
        int		 height()	const;
        QRect	 rect()		const;
        QRect	 childrenRect() const;
        QRegion	 childrenRegion() const;

        QSize	 minimumSize()	 const;
        QSize	 maximumSize()	 const;
        int		 minimumWidth()	 const;
        int		 minimumHeight() const;
        int		 maximumWidth()	 const;
        int		 maximumHeight() const;
        void	 setMinimumSize( const QSize & );
        virtual void setMinimumSize( int minw, int minh );
        void	 setMaximumSize( const QSize & );
        virtual void setMaximumSize( int maxw, int maxh );
        void	 setMinimumWidth( int minw );
        void	 setMinimumHeight( int minh );
        void	 setMaximumWidth( int maxw );
        void	 setMaximumHeight( int maxh );

        QSize	 sizeIncrement() const;
        void	 setSizeIncrement( const QSize & );
        virtual void setSizeIncrement( int w, int h );
        QSize	 baseSize() const;
        void	 setBaseSize( const QSize & );
        void	 setBaseSize( int basew, int baseh );

        void	setFixedSize( const QSize & );
        void	setFixedSize( int w, int h );
        void	setFixedWidth( int w );
        void	setFixedHeight( int h );

        // Widget coordinate mapping

        QPoint	 mapToGlobal( const QPoint & )	 const;
        QPoint	 mapFromGlobal( const QPoint & ) const;
        QPoint	 mapToParent( const QPoint & )	 const;
        QPoint	 mapFromParent( const QPoint & ) const;
        QPoint	 mapTo( QWidget *, const QPoint & ) const;
        QPoint	 mapFrom( QWidget *, const QPoint & ) const;

        QWidget	*topLevelWidget()   const;

        // Widget attribute functions

        BackgroundMode	backgroundMode() const;
        virtual void	setBackgroundMode( BackgroundMode );
        void 		setBackgroundMode( BackgroundMode, BackgroundMode );

        const QColor &	foregroundColor() const;

        const QColor &	eraseColor() const;
        virtual void	setEraseColor( const QColor & );

        const QPixmap *	erasePixmap() const;
        virtual void	setErasePixmap( const QPixmap & );

    #ifndef QT_NO_PALETTE
        const QColorGroup & colorGroup() const;
        const QPalette &	palette()    const;
        bool		ownPalette() const;
        virtual void	setPalette( const QPalette & );
        void		unsetPalette();
    #endif

        const QColor &	paletteForegroundColor() const;
        void		setPaletteForegroundColor( const QColor & );

        const QColor &	paletteBackgroundColor() const;
        virtual void	setPaletteBackgroundColor( const QColor & );

        const QPixmap *	paletteBackgroundPixmap() const;
        virtual void 	setPaletteBackgroundPixmap( const QPixmap & );

        const QBrush&	backgroundBrush() const;

        QFont		font() const;
        bool		ownFont() const;
        virtual void	setFont( const QFont & );
        void		unsetFont();
        QFontMetrics	fontMetrics() const;
        QFontInfo	 	fontInfo() const;

    #ifndef QT_NO_CURSOR
        const QCursor      &cursor() const;
        bool		ownCursor() const;
        virtual void	setCursor( const QCursor & );
        virtual void	unsetCursor();
    #endif
    #ifndef QT_NO_WIDGET_TOPEXTRA
        QString		caption() const;
        const QPixmap      *icon() const;
        QString		iconText() const;
    #endif
        bool		hasMouseTracking() const;
        bool		hasMouse() const;

        virtual void	setMask( const QBitmap & );
        virtual void	setMask( const QRegion & );
        void		clearMask();

        const QColor &	backgroundColor() const; // obsolete, use eraseColor()
        virtual void	setBackgroundColor( const QColor & ); // obsolete, use setEraseColor()
        const QPixmap *	backgroundPixmap() const; // obsolete, use erasePixmap()
        virtual void	setBackgroundPixmap( const QPixmap & ); // obsolete, use setErasePixmap()

    public slots:
    #ifndef QT_NO_WIDGET_TOPEXTRA
        virtual void	setCaption( const QString &);
        virtual void	setIcon( const QPixmap & );
        virtual void	setIconText( const QString &);
    #endif
        virtual void	setMouseTracking( bool enable );

        // Keyboard input focus functions

        virtual void	setFocus();
        void		clearFocus();

    public:
        enum FocusPolicy {
    	NoFocus = 0,
    	TabFocus = 0x1,
    	ClickFocus = 0x2,
    	StrongFocus = TabFocus | ClickFocus | 0x8,
    	WheelFocus = StrongFocus | 0x4
        };

        bool		isActiveWindow() const;
        virtual void	setActiveWindow();
        bool		isFocusEnabled() const;

        FocusPolicy		focusPolicy() const;
        virtual void	setFocusPolicy( FocusPolicy );
        bool		hasFocus() const;
        static void		setTabOrder( QWidget *, QWidget * );
        virtual void	setFocusProxy( QWidget * );
        QWidget *		focusProxy() const;

        void setInputMethodEnabled( bool b );
        bool isInputMethodEnabled() const;
        // Grab functions

        void		grabMouse();
    #ifndef QT_NO_CURSOR
        void		grabMouse( const QCursor & );
    #endif
        void		releaseMouse();
        void		grabKeyboard();
        void		releaseKeyboard();
        static QWidget *	mouseGrabber();
        static QWidget *	keyboardGrabber();

        // Update/refresh functions

        bool	 	isUpdatesEnabled() const;

    #if 0 //def Q_WS_QWS
        void		repaintUnclipped( const QRegion &, bool erase = TRUE );
    #endif
    public slots:
        virtual void	setUpdatesEnabled( bool enable );
        void		update();
        void		update( int x, int y, int w, int h );
        void		update( const QRect& );
        void		repaint();
        void		repaint( bool erase );
        void		repaint( int x, int y, int w, int h, bool erase=TRUE );
        void		repaint( const QRect &, bool erase = TRUE );
        void		repaint( const QRegion &, bool erase = TRUE );

        // Widget management functions

        virtual void	show();
        virtual void	hide();
        void		setShown( bool show );
        void		setHidden( bool hide );
    #ifndef QT_NO_COMPAT
        void		iconify() { showMinimized(); }
    #endif
        virtual void	showMinimized();
        virtual void	showMaximized();
        void		showFullScreen();
        virtual void	showNormal();
        virtual void	polish();
        void 		constPolish() const;
        bool		close();

        void		raise();
        void		lower();
        void		stackUnder( QWidget* );
        virtual void	move( int x, int y );
        void		move( const QPoint & );
        virtual void	resize( int w, int h );
        void		resize( const QSize & );
        virtual void	setGeometry( int x, int y, int w, int h );
        virtual void	setGeometry( const QRect & ); // ### make non virtual in Qt 4?

    public:
        virtual bool	close( bool alsoDelete );
        bool		isVisible()	const;
        bool		isVisibleTo(QWidget*) const;
        bool		isVisibleToTLW() const; // obsolete
        QRect		visibleRect() const; // obsolete
        bool 		isHidden() const;
        bool 		isShown() const;
        bool		isMinimized() const;
        bool		isMaximized() const;
        bool		isFullScreen() const;

        virtual QSize	sizeHint() const;
        virtual QSize	minimumSizeHint() const;
        virtual QSizePolicy	sizePolicy() const;
        virtual void	setSizePolicy( QSizePolicy );
        void 		setSizePolicy( QSizePolicy::SizeType hor, QSizePolicy::SizeType ver, bool hfw = FALSE );
        virtual int heightForWidth(int) const;

        QRegion	clipRegion() const;

    // ### move together with other slots in Qt 4.0
    public slots:
        virtual void  	adjustSize();

    public:
    #ifndef QT_NO_LAYOUT
        QLayout *		layout() const { return lay_out; }
    #endif
        void		updateGeometry();
        virtual void 	reparent( QWidget *parent, WFlags, const QPoint &,
    				  bool showIt=FALSE );
        void		reparent( QWidget *parent, const QPoint &,
    				  bool showIt=FALSE );
    #ifndef QT_NO_COMPAT
        void		recreate( QWidget *parent, WFlags f, const QPoint & p,
    				  bool showIt=FALSE ) { reparent(parent,f,p,showIt); }
    #endif

        void		erase();
        void		erase( int x, int y, int w, int h );
        void		erase( const QRect & );
        void		erase( const QRegion & );
        void		scroll( int dx, int dy );
        void		scroll( int dx, int dy, const QRect& );

        void		drawText( int x, int y, const QString &);
        void		drawText( const QPoint &, const QString &);

        // Misc. functions

        QWidget *		focusWidget() const;
        QRect               microFocusHint() const;

        // drag and drop

        bool		acceptDrops() const;
        virtual void	setAcceptDrops( bool on );

        // transparency and pseudo transparency

        virtual void	setAutoMask(bool);
        bool		autoMask() const;

        enum BackgroundOrigin { WidgetOrigin, ParentOrigin, WindowOrigin, AncestorOrigin };

        virtual void setBackgroundOrigin( BackgroundOrigin );
        BackgroundOrigin backgroundOrigin() const;
        QPoint backgroundOffset() const;

        // whats this help
        virtual bool customWhatsThis() const;

        QWidget *		parentWidget( bool sameWindow = FALSE ) const;
        WState		testWState( WState s ) const;
        WFlags		testWFlags( WFlags f ) const;
        static QWidget *	find( WId );
        static QWidgetMapper *wmapper();

        QWidget  *childAt( int x, int y, bool includeThis = FALSE ) const;
        QWidget  *childAt( const QPoint &, bool includeThis = FALSE ) const;

    #if defined(Q_WS_QWS)
        virtual QGfx * graphicsContext(bool clip_children=TRUE) const;
    #endif
    #if defined(Q_WS_MAC)
        QRegion clippedRegion(bool do_children=TRUE);
        uint clippedSerial(bool do_children=TRUE);
    #ifndef QMAC_NO_QUARTZ
        CGContextRef macCGContext(bool clipped=TRUE) const;
    #endif
    #endif

    protected:
        // Event handlers
        bool	 event( QEvent * );
        virtual void mousePressEvent( QMouseEvent * );
        virtual void mouseReleaseEvent( QMouseEvent * );
        virtual void mouseDoubleClickEvent( QMouseEvent * );
        virtual void mouseMoveEvent( QMouseEvent * );
    #ifndef QT_NO_WHEELEVENT
        virtual void wheelEvent( QWheelEvent * );
    #endif
        virtual void keyPressEvent( QKeyEvent * );
        virtual void keyReleaseEvent( QKeyEvent * );
        virtual void focusInEvent( QFocusEvent * );
        virtual void focusOutEvent( QFocusEvent * );
        virtual void enterEvent( QEvent * );
        virtual void leaveEvent( QEvent * );
        virtual void paintEvent( QPaintEvent * );
        virtual void moveEvent( QMoveEvent * );
        virtual void resizeEvent( QResizeEvent * );
        virtual void closeEvent( QCloseEvent * );
        virtual void contextMenuEvent( QContextMenuEvent * );
        virtual void imStartEvent( QIMEvent * );
        virtual void imComposeEvent( QIMEvent * );
        virtual void imEndEvent( QIMEvent * );
        virtual void tabletEvent( QTabletEvent * );

    #ifndef QT_NO_DRAGANDDROP
        virtual void dragEnterEvent( QDragEnterEvent * );
        virtual void dragMoveEvent( QDragMoveEvent * );
        virtual void dragLeaveEvent( QDragLeaveEvent * );
        virtual void dropEvent( QDropEvent * );
    #endif

        virtual void showEvent( QShowEvent * );
        virtual void hideEvent( QHideEvent * );

    #if defined(Q_WS_MAC)
        virtual bool macEvent( MSG * );
    #endif
    #if defined(Q_WS_WIN)
        virtual bool winEvent( MSG * );
    #endif
    #if defined(Q_WS_X11)
        virtual bool x11Event( XEvent * );
    #endif
    #if defined(Q_WS_QWS)
        virtual bool qwsEvent( QWSEvent * );
        virtual unsigned char *scanLine( int ) const;
        virtual int bytesPerLine() const;
    #endif

        virtual void updateMask();

        // Misc. protected functions

    #ifndef QT_NO_STYLE
        virtual void styleChange( QStyle& );
    #endif
        virtual void enabledChange( bool oldEnabled );
    #ifndef QT_NO_PALETTE
        virtual void paletteChange( const QPalette & );
    #endif
        virtual void fontChange( const QFont & );
        virtual void windowActivationChange( bool oldActive );

        int		 metric( int )	const;

        void	 resetInputContext();

        virtual void create( WId = 0, bool initializeWindow = TRUE,
    			 bool destroyOldWindow = TRUE );
        virtual void destroy( bool destroyWindow = TRUE,
    			  bool destroySubWindows = TRUE );
        uint	 getWState() const;
        virtual void setWState( uint );
        void	 clearWState( uint n );
        WFlags	 getWFlags() const;
        virtual void setWFlags( WFlags );
        void	 clearWFlags( WFlags n );

        virtual bool focusNextPrevChild( bool next );

        QWExtra	*extraData();
        QTLWExtra	*topData();
        QFocusData	*focusData();

        virtual void setKeyCompression(bool);
        virtual void setMicroFocusHint(int x, int y, int w, int h, bool text=TRUE, QFont *f = 0);

    #if defined(Q_WS_MAC)
        void dirtyClippedRegion(bool);
        bool isClippedRegionDirty();
        virtual void setRegionDirty(bool);
        virtual void macWidgetChangedWindow();
    #endif

    private slots:
        void	 focusProxyDestroyed();

    private:
        void	 setFontSys( QFont *f = 0 );
    #if defined(Q_WS_X11)
        void	 createInputContext();
        void	 destroyInputContext();
        void	 focusInputContext();
        void	 checkChildrenDnd();
    #elif defined(Q_WS_MAC)
        uint    own_id : 1, macDropEnabled : 1;
        EventHandlerRef window_event;
        //mac event functions
        void    propagateUpdates(bool update_rgn=TRUE);
        void    update( const QRegion& );
        //friends, way too many - fix this immediately!
        friend void qt_clean_root_win();
        friend bool qt_recreate_root_win();
        friend QPoint posInWindow(QWidget *);
        friend bool qt_mac_update_sizer(QWidget *, int);
        friend QWidget *qt_recursive_match(QWidget *widg, int x, int y);
        friend bool qt_paint_children(QWidget *,QRegion &, uchar ops);
        friend QMAC_PASCAL OSStatus qt_window_event(EventHandlerCallRef er, EventRef event, void *);
        friend void qt_event_request_updates(QWidget *, const QRegion &, bool subtract=FALSE);
        friend bool qt_window_rgn(WId, short, RgnHandle, bool);
        friend class QDragManager;
    #endif

    #ifndef QT_NO_LAYOUT
        void 	 setLayout( QLayout *l );
    #endif
        void	 setWinId( WId );
        void	 showWindow();
        void	 hideWindow();
        void	 showChildren( bool spontaneous );
        void	 hideChildren( bool spontaneous );
        void	 reparentSys( QWidget *parent, WFlags, const QPoint &,  bool showIt);
        void	 createTLExtra();
        void	 createExtra();
        void	 deleteExtra();
        void	 createSysExtra();
        void	 deleteSysExtra();
        void	 createTLSysExtra();
        void	 deleteTLSysExtra();
        void	 deactivateWidgetCleanup();
        void	 internalSetGeometry( int, int, int, int, bool );
        void	 reparentFocusWidgets( QWidget * );
        QFocusData	*focusData( bool create );
        void         setBackgroundFromMode();
        void         setBackgroundColorDirect( const QColor & );
        void   	 setBackgroundPixmapDirect( const QPixmap & );
        void         setBackgroundModeDirect( BackgroundMode );
        void         setBackgroundEmpty();
        void	 updateFrameStrut() const;
    #if defined(Q_WS_X11)
        void         setBackgroundX11Relative();
    #endif

        WId		 winid;
        uint	 widget_state;
        uint	 widget_flags;
        uint	 focus_policy : 4;
        uint 	 own_font :1;
        uint 	 own_palette :1;
        uint 	 sizehint_forced :1;
        uint 	 is_closing :1;
        uint 	 in_show : 1;
        uint 	 in_show_maximized : 1;
        uint	 fstrut_dirty : 1;
        uint	 im_enabled : 1;
        QRect	 crect;
        QColor	 bg_col;
    #ifndef QT_NO_PALETTE
        QPalette	 pal;
    #endif
        QFont	 fnt;
    #ifndef QT_NO_LAYOUT
        QLayout 	*lay_out;
    #endif
        QWExtra	*extra;
    #if defined(Q_WS_QWS)
        QRegion	 req_region;			// Requested region
        mutable QRegion	 paintable_region;	// Paintable region
        mutable bool         paintable_region_dirty;// needs to be recalculated
        mutable QRegion      alloc_region;          // Allocated region
        mutable bool         alloc_region_dirty;    // needs to be recalculated
        mutable int          overlapping_children;  // Handle overlapping children

        int		 alloc_region_index;
        int		 alloc_region_revision;

        void updateOverlappingChildren() const;
        void setChildrenAllocatedDirty();
        void setChildrenAllocatedDirty( const QRegion &r, const QWidget *dirty=0 );
        bool isAllocatedRegionDirty() const;
        void updateRequestedRegion( const QPoint &gpos );
        QRegion requestedRegion() const;
        QRegion allocatedRegion() const;
        QRegion paintableRegion() const;

        void setActivePainter( QPainter *painter ) const;
        void clearActivePainter() const;
        void updateActivePainter() const;
        void updateGraphicsContext( QGfx *qgfx_qws, bool clip_children ) const;
    #ifndef QT_NO_CURSOR
        void updateCursor( const QRegion &r ) const;
    #endif

        // used to accumulate dirty region when children moved/resized.
        QRegion dirtyChildren;
        bool isSettingGeometry;
        friend class QWSManager;
    #endif
        static int instanceCounter;  // Current number of widget instances
        static int maxInstances;     // Maximum number of widget instances

        static void	 createMapper();
        static void	 destroyMapper();
        static QWidgetList	 *wList();
        static QWidgetList	 *tlwList();
        static QWidgetMapper *mapper;
        friend class QApplication;
        friend class QBaseApplication;
        friend class QPainter;
        friend class QFontMetrics;
        friend class QFontInfo;
        friend class QETWidget;
        friend class QLayout;

    private:	// Disabled copy constructor and operator=
    #if defined(Q_DISABLE_COPY)
        QWidget( const QWidget & );
        QWidget &operator=( const QWidget & );
    #endif

    public: // obsolete functions to dissappear or to become inline in 3.0
    #ifndef QT_NO_PALETTE
        void setPalette( const QPalette &p, bool ) { setPalette( p ); }
    #endif
        void setFont( const QFont &f, bool ) { setFont( f ); }
    };

    inline Qt::WState QWidget::testWState( WState s ) const
    { return (widget_state & s); }

    inline Qt::WFlags QWidget::testWFlags( WFlags f ) const
    { return (widget_flags & f); }

    inline WId QWidget::winId() const
    { return winid; }

    inline bool QWidget::isTopLevel() const
    { return testWFlags(WType_TopLevel); }

    inline bool QWidget::isDialog() const
    { return testWFlags(WType_Dialog); }

    inline bool QWidget::isPopup() const
    { return testWFlags(WType_Popup); }

    inline bool QWidget::isDesktop() const
    { return testWFlags(WType_Desktop); }

    inline bool QWidget::isEnabled() const
    { return !testWState(WState_Disabled); }

    inline bool QWidget::isModal() const
    { return testWFlags(WShowModal); }

    inline bool QWidget::isEnabledToTLW() const
    { return isEnabled(); }

    inline const QRect &QWidget::geometry() const
    { return crect; }

    inline QSize QWidget::size() const
    { return crect.size(); }

    inline int QWidget::width() const
    { return crect.width(); }

    inline int QWidget::height() const
    { return crect.height(); }

    inline QRect QWidget::rect() const
    { return QRect(0,0,crect.width(),crect.height()); }

    inline int QWidget::minimumWidth() const
    { return minimumSize().width(); }

    inline int QWidget::minimumHeight() const
    { return minimumSize().height(); }

    inline int QWidget::maximumWidth() const
    { return maximumSize().width(); }

    inline int QWidget::maximumHeight() const
    { return maximumSize().height(); }

    inline void QWidget::setMinimumSize( const QSize &s )
    { setMinimumSize(s.width(),s.height()); }

    inline void QWidget::setMaximumSize( const QSize &s )
    { setMaximumSize(s.width(),s.height()); }

    inline void QWidget::setSizeIncrement( const QSize &s )
    { setSizeIncrement(s.width(),s.height()); }

    inline void QWidget::setBaseSize( const QSize &s )
    { setBaseSize(s.width(),s.height()); }

    inline const QColor &QWidget::eraseColor() const
    { return bg_col; }

    #ifndef QT_NO_PALETTE
    inline const QPalette &QWidget::palette() const
    { return pal; }
    #endif

    inline QFont QWidget::font() const
    { return fnt; }

    inline QFontMetrics QWidget::fontMetrics() const
    { return QFontMetrics(font()); }

    inline QFontInfo QWidget::fontInfo() const
    { return QFontInfo(font()); }

    inline bool QWidget::hasMouseTracking() const
    { return testWState(WState_MouseTracking); }

    inline bool QWidget::hasMouse() const
    { return testWState(WState_HasMouse); }

    inline bool  QWidget::isFocusEnabled() const
    { return (FocusPolicy)focus_policy != NoFocus; }

    inline QWidget::FocusPolicy QWidget::focusPolicy() const
    { return (FocusPolicy)focus_policy; }

    inline bool QWidget::isUpdatesEnabled() const
    { return !testWState(WState_BlockUpdates); }

    inline void QWidget::update( const QRect &r )
    { update( r.x(), r.y(), r.width(), r.height() ); }

    inline void QWidget::repaint()
    { repaint( TRUE ); }

    inline void QWidget::repaint( const QRect &r, bool erase )
    { repaint( r.x(), r.y(), r.width(), r.height(), erase ); }

    inline void QWidget::erase()
    { erase( 0, 0, crect.width(), crect.height() ); }

    inline void QWidget::erase( const QRect &r )
    { erase( r.x(), r.y(), r.width(), r.height() ); }

    inline bool QWidget::close()
    { return close( FALSE ); }

    inline bool QWidget::isVisible() const
    { return testWState(WState_Visible); }

    inline bool QWidget::isVisibleToTLW() const // obsolete
    { return isVisible(); }

    inline bool QWidget::isHidden() const
    { return testWState(WState_ForceHide); }

    inline bool QWidget::isShown() const
    { return !testWState(WState_ForceHide); }

    inline void QWidget::move( const QPoint &p )
    { move( p.x(), p.y() ); }

    inline void QWidget::resize( const QSize &s )
    { resize( s.width(), s.height()); }

    inline void QWidget::setGeometry( const QRect &r )
    { setGeometry( r.left(), r.top(), r.width(), r.height() ); }

    inline void QWidget::drawText( const QPoint &p, const QString &s )
    { drawText( p.x(), p.y(), s ); }

    inline QWidget *QWidget::parentWidget( bool sameWindow ) const
    {
        if ( sameWindow )
    	return isTopLevel() ? 0 : (QWidget *)QObject::parent();
        return (QWidget *)QObject::parent();
    }

    inline QWidgetMapper *QWidget::wmapper()
    { return mapper; }

    inline uint QWidget::getWState() const
    { return widget_state; }

    inline void QWidget::setWState( uint f )
    { widget_state |= f; }

    inline void QWidget::clearWState( uint f )
    { widget_state &= ~f; }

    inline Qt::WFlags QWidget::getWFlags() const
    { return widget_flags; }

    inline void QWidget::setWFlags( WFlags f )
    { widget_flags |= f; }

    inline void QWidget::clearWFlags( WFlags f )
    { widget_flags &= ~f; }

    inline void QWidget::constPolish() const
    {
        if ( !testWState(WState_Polished) ) {
    	QWidget* that = (QWidget*) this;
    	that->polish();
            that->setWState(WState_Polished); // be on the safe side...
        }
    }
    #ifndef QT_NO_CURSOR
    inline bool QWidget::ownCursor() const
    {
        return testWState( WState_OwnCursor );
    }
    #endif
    inline bool QWidget::ownFont() const
    {
        return own_font;
    }
    #ifndef QT_NO_PALETTE
    inline bool QWidget::ownPalette() const
    {
        return own_palette;
    }
    #endif

    inline void QWidget::setSizePolicy( QSizePolicy::SizeType hor, QSizePolicy::SizeType ver, bool hfw )
    {
        setSizePolicy( QSizePolicy( hor, ver, hfw) );
    }

    inline bool QWidget::isInputMethodEnabled() const
    {
        return (bool)im_enabled;
    }

    // Extra QWidget data
    //  - to minimize memory usage for members that are seldom used.
    //  - top-level widgets have extra extra data to reduce cost further

    class QFocusData;
    class QWSManager;
    #if defined(Q_WS_WIN)
    class QOleDropTarget;
    #endif
    #if defined(Q_WS_MAC)
    class QMacDndExtra;
    #endif

    struct Q_EXPORT QTLWExtra {
    #ifndef QT_NO_WIDGET_TOPEXTRA
        QString  caption;				// widget caption
        QString  iconText;				// widget icon text
        QPixmap *icon;				// widget icon
    #endif
        QFocusData *focusData;			// focus data (for TLW)
        short    incw, inch;			// size increments
        // frame strut
        ulong    fleft, fright, ftop, fbottom;
        uint     iconic: 1;				// iconified [cur. win32 only]
        uint     fullscreen : 1;			// full-screen mode
        uint     showMode: 2;			// 0 normal, 1 minimized, 2 maximized, 3 reset
        uint     savedFlags;			// Save widgetflags while showing fullscreen
        short    basew, baseh;			// base sizes
    #if defined(Q_WS_X11)
        WId  parentWinId;				// parent window Id (valid after reparenting)
        uint     embedded : 1;			// window is embedded in another Qt application
        uint     spont_unmapped: 1;			// window was spontaneously unmapped
        uint     reserved: 1;			// reserved
        uint     dnd : 1;				// DND properties installed
        uint     uspos : 1;				// User defined position
        uint     ussize : 1;			// User defined size
        void    *xic;				// XIM Input Context
    #endif
    #if defined(Q_WS_MAC)
        WindowGroupRef group;
        uint     is_moved: 1;
        uint     resizer : 4;
    #endif
    #if defined(Q_WS_QWS) && !defined ( QT_NO_QWS_MANAGER )
        QRegion decor_allocated_region;		// decoration allocated region
        QWSManager *qwsManager;
    #endif
    #if defined(Q_WS_WIN)
        HICON    winIcon;				// internal Windows icon
    #endif
        QRect    normalGeometry;			// used by showMin/maximized/FullScreen
    };

    #define QWIDGETSIZE_MAX 32767

    // dear user: you can see this struct, but it is internal. do not touch.

    struct Q_EXPORT QWExtra {
        Q_INT16  minw, minh;			// minimum size
        Q_INT16  maxw, maxh;			// maximum size
        QPixmap *bg_pix;				// background pixmap
        QWidget *focus_proxy;
    #ifndef QT_NO_CURSOR
        QCursor *curs;
    #endif
        QTLWExtra *topextra;			// only useful for TLWs
    #if defined(Q_WS_WIN)
        QOleDropTarget *dropTarget;			// drop target
    #endif
    #if defined(Q_WS_X11)
        WId xDndProxy;				// XDND forwarding to embedded windows
    #endif
    #if defined(Q_WS_MAC)
        QRegion clip_saved, clip_sibs, clip_children;
        QMacDndExtra *macDndExtra;
        QRegion dirty_area;
        uint clip_dirty : 1, clip_serial : 15;
        uint child_dirty : 1, child_serial : 15;
    #ifndef QMAC_NO_QUARTZ
        uint ctx_children_clipped:1;
    #endif // QMAC_NO_QUARTZ
        uint has_dirty_area:1;
    #endif // Q_WS_MAC
        uint bg_origin : 2;
    #if defined(Q_WS_X11)
        uint children_use_dnd : 1;
        uint compress_events : 1;
    #endif
    #if defined(Q_WS_QWS) || defined(Q_WS_MAC)
        QRegion mask;				// widget mask
    #endif
        char     bg_mode;				// background mode
        char     bg_mode_visual;			// visual background mode
    #ifndef QT_NO_STYLE
        QStyle* style;
    #endif
        QRect micro_focus_hint;			// micro focus hint
        QSizePolicy size_policy;
    };

    #define Q_DEFINED_QWIDGET
    #include "qwinexport.h"

    #endif // QWIDGET_H