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# qscrollview.h

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

    /****************************************************************************
    ** $Id: qt/qscrollview.h   3.2.1   edited May 13 09:08 $
    **
    ** Definition of QScrollView class
    **
    ** Created : 970523
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the widgets 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 QSCROLLVIEW_H
    #define QSCROLLVIEW_H

    #ifndef QT_H
    #include "qframe.h"
    #include "qscrollbar.h"
    #endif // QT_H

    #ifndef QT_NO_SCROLLVIEW

    class QScrollViewData;

    class Q_EXPORT QScrollView : public QFrame
    {
        Q_OBJECT
        Q_ENUMS( ResizePolicy ScrollBarMode )
        Q_PROPERTY( ResizePolicy resizePolicy READ resizePolicy WRITE setResizePolicy )
        Q_PROPERTY( ScrollBarMode vScrollBarMode READ vScrollBarMode WRITE setVScrollBarMode )
        Q_PROPERTY( ScrollBarMode hScrollBarMode READ hScrollBarMode WRITE setHScrollBarMode )
        Q_PROPERTY( int visibleWidth READ visibleWidth )
        Q_PROPERTY( int visibleHeight READ visibleHeight )
        Q_PROPERTY( int contentsWidth READ contentsWidth )
        Q_PROPERTY( int contentsHeight READ contentsHeight )
        Q_PROPERTY( int contentsX READ contentsX )
        Q_PROPERTY( int contentsY READ contentsY )
    #ifndef QT_NO_DRAGANDDROP
        Q_PROPERTY( bool dragAutoScroll READ dragAutoScroll WRITE setDragAutoScroll )
    #endif

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

        enum ResizePolicy { Default, Manual, AutoOne, AutoOneFit };
        virtual void setResizePolicy( ResizePolicy );
        ResizePolicy resizePolicy() const;

        void styleChange( QStyle & );
        void removeChild(QWidget* child);
        virtual void addChild( QWidget* child, int x=0, int y=0 );
        virtual void moveChild( QWidget* child, int x, int y );
        int childX(QWidget* child);
        int childY(QWidget* child);
        bool childIsVisible(QWidget* child) { return child->isVisible(); } // obsolete functions
        void showChild(QWidget* child, bool yes=TRUE) {
    	if ( yes )
    	    child->show();
    	else
    	    child->hide();
        }

        enum ScrollBarMode { Auto, AlwaysOff, AlwaysOn };

        ScrollBarMode vScrollBarMode() const;
        virtual void  setVScrollBarMode( ScrollBarMode );

        ScrollBarMode hScrollBarMode() const;
        virtual void  setHScrollBarMode( ScrollBarMode );

        QWidget*     cornerWidget() const;
        virtual void setCornerWidget(QWidget*);

        // ### 4.0: Consider providing a factory function for scrollbars
        //          (e.g. make the two following functions virtual)
        QScrollBar*  horizontalScrollBar() const;
        QScrollBar*  verticalScrollBar() const;
        QWidget*	 viewport() const;
        QWidget*	 clipper() const;

        int		visibleWidth() const;
        int		visibleHeight() const;

        int		contentsWidth() const;
        int		contentsHeight() const;
        int		contentsX() const;
        int		contentsY() const;

        void	resize( int w, int h );
        void	resize( const QSize& );
        void	show();

        void	updateContents( int x, int y, int w, int h );
        void	updateContents( const QRect& r );
        void 	updateContents();
        void	repaintContents( int x, int y, int w, int h, bool erase=TRUE );
        void	repaintContents( const QRect& r, bool erase=TRUE );
        void 	repaintContents( bool erase=TRUE );
        void	contentsToViewport( int x, int y, int& vx, int& vy ) const;
        void	viewportToContents( int vx, int vy, int& x, int& y ) const;
        QPoint	contentsToViewport( const QPoint& ) const;
        QPoint	viewportToContents( const QPoint& ) const;
        void	enableClipper( bool y );

        void	setStaticBackground( bool y );
        bool	hasStaticBackground() const;

        QSize	viewportSize( int, int ) const;
        QSize	sizeHint() const;
        QSize	minimumSizeHint() const;

        void	removeChild(QObject* child);

        bool	isHorizontalSliderPressed();
        bool	isVerticalSliderPressed();

    #ifndef QT_NO_DRAGANDDROP
        virtual void setDragAutoScroll( bool b );
        bool	 dragAutoScroll() const;
    #endif

    signals:
        void	contentsMoving(int x, int y);
        void	horizontalSliderPressed();
        void	horizontalSliderReleased();
        void	verticalSliderPressed();
        void	verticalSliderReleased();

    public slots:
        virtual void resizeContents( int w, int h );
        void	scrollBy( int dx, int dy );
        virtual void setContentsPos( int x, int y );
        void	ensureVisible(int x, int y);
        void	ensureVisible(int x, int y, int xmargin, int ymargin);
        void	center(int x, int y);
        void	center(int x, int y, float xmargin, float ymargin);

        void	updateScrollBars(); // ### virtual in 4.0
        void	setEnabled( bool enable );

    protected:
        virtual void drawContents(QPainter*, int cx, int cy, int cw, int ch);
        virtual void drawContentsOffset(QPainter*, int ox, int oy,
    		    int cx, int cy, int cw, int ch);

        virtual void contentsMousePressEvent( QMouseEvent* );
        virtual void contentsMouseReleaseEvent( QMouseEvent* );
        virtual void contentsMouseDoubleClickEvent( QMouseEvent* );
        virtual void contentsMouseMoveEvent( QMouseEvent* );
    #ifndef QT_NO_DRAGANDDROP
        virtual void contentsDragEnterEvent( QDragEnterEvent * );
        virtual void contentsDragMoveEvent( QDragMoveEvent * );
        virtual void contentsDragLeaveEvent( QDragLeaveEvent * );
        virtual void contentsDropEvent( QDropEvent * );
    #endif
    #ifndef QT_NO_WHEELEVENT
        virtual void contentsWheelEvent( QWheelEvent * );
    #endif
        virtual void contentsContextMenuEvent( QContextMenuEvent * );

        virtual void viewportPaintEvent( QPaintEvent* );
        virtual void viewportResizeEvent( QResizeEvent* );
        virtual void viewportMousePressEvent( QMouseEvent* );
        virtual void viewportMouseReleaseEvent( QMouseEvent* );
        virtual void viewportMouseDoubleClickEvent( QMouseEvent* );
        virtual void viewportMouseMoveEvent( QMouseEvent* );
    #ifndef QT_NO_DRAGANDDROP
        virtual void viewportDragEnterEvent( QDragEnterEvent * );
        virtual void viewportDragMoveEvent( QDragMoveEvent * );
        virtual void viewportDragLeaveEvent( QDragLeaveEvent * );
        virtual void viewportDropEvent( QDropEvent * );
    #endif
    #ifndef QT_NO_WHEELEVENT
        virtual void viewportWheelEvent( QWheelEvent * );
    #endif
        virtual void viewportContextMenuEvent( QContextMenuEvent * );

        void	frameChanged();

        virtual void setMargins(int left, int top, int right, int bottom);
        int leftMargin() const;
        int topMargin() const;
        int rightMargin() const;
        int bottomMargin() const;

        bool focusNextPrevChild( bool next );

        virtual void setHBarGeometry(QScrollBar& hbar, int x, int y, int w, int h);
        virtual void setVBarGeometry(QScrollBar& vbar, int x, int y, int w, int h);

        void resizeEvent(QResizeEvent*);
        void  mousePressEvent( QMouseEvent * );
        void  mouseReleaseEvent( QMouseEvent * );
        void  mouseDoubleClickEvent( QMouseEvent * );
        void  mouseMoveEvent( QMouseEvent * );
    #ifndef QT_NO_WHEELEVENT
        void  wheelEvent( QWheelEvent * );
    #endif
        void contextMenuEvent( QContextMenuEvent * );
        bool eventFilter( QObject *, QEvent *e );

        void setCachedSizeHint( const QSize &sh ) const;
        QSize cachedSizeHint() const;
        void fontChange( const QFont & );

    private:
        void drawContents( QPainter* );
        void moveContents(int x, int y);

        QScrollViewData* d;

    private slots:
        void hslide(int);
        void vslide(int);
        void hbarIsPressed();
        void hbarIsReleased();
        void vbarIsPressed();
        void vbarIsReleased();
    #ifndef QT_NO_DRAGANDDROP
        void doDragAutoScroll();
        void startDragAutoScroll();
        void stopDragAutoScroll();
    #endif

    private: // Disabled copy constructor and operator=
    #if defined(Q_DISABLE_COPY)
        QScrollView( const QScrollView & );
        QScrollView &operator=( const QScrollView & );
    #endif
        void changeFrameRect(const QRect&);

    public:
        void disableSizeHintCaching();

    };

    #endif // QT_NO_SCROLLVIEW

    #endif // QSCROLLVIEW_H