/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef Q3SCROLLVIEW_H
#define Q3SCROLLVIEW_H

#include <Qt3Support/q3frame.h>
#include <QtGui/qscrollbar.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Qt3SupportLight)

class Q3ScrollViewData;

class Q_COMPAT_EXPORT Q3ScrollView : public Q3Frame
{
    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 )
    Q_PROPERTY( bool dragAutoScroll READ dragAutoScroll WRITE setDragAutoScroll )

public:
    Q3ScrollView(QWidget* parent=0, const char* name=0, Qt::WindowFlags f=0);
    ~Q3ScrollView();

    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) { child->setVisible(yes); }

    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	setVisible(bool visible);

    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();

    virtual void setDragAutoScroll( bool b );
    bool	 dragAutoScroll() const;

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

public Q_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* );
    virtual void contentsDragEnterEvent( QDragEnterEvent * );
    virtual void contentsDragMoveEvent( QDragMoveEvent * );
    virtual void contentsDragLeaveEvent( QDragLeaveEvent * );
    virtual void contentsDropEvent( QDropEvent * );
    virtual void contentsWheelEvent( QWheelEvent * );
    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* );
    virtual void viewportDragEnterEvent( QDragEnterEvent * );
    virtual void viewportDragMoveEvent( QDragMoveEvent * );
    virtual void viewportDragLeaveEvent( QDragLeaveEvent * );
    virtual void viewportDropEvent( QDropEvent * );
    virtual void viewportWheelEvent( QWheelEvent * );
    virtual void viewportContextMenuEvent( QContextMenuEvent * );

    void	frameChanged();

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

    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 * );
    void  wheelEvent( QWheelEvent * );
    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);

    Q3ScrollViewData* d;

private Q_SLOTS:
    void hslide(int);
    void vslide(int);
    void hbarIsPressed();
    void hbarIsReleased();
    void vbarIsPressed();
    void vbarIsReleased();
    void doDragAutoScroll();
    void startDragAutoScroll();
    void stopDragAutoScroll();

private: // Disabled copy constructor and operator=
    Q_DISABLE_COPY(Q3ScrollView)
    void changeFrameRect(const QRect&);

public:
    void disableSizeHintCaching();

};

QT_END_NAMESPACE

QT_END_HEADER

#endif // Q3SCROLLVIEW_H
