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+
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _RG_ROSEGARDENSCROLLVIEW_H_
+#define _RG_ROSEGARDENSCROLLVIEW_H_
+
+#include <qpoint.h>
+#include <qscrollview.h>
+#include <qdatetime.h>
+#include <qtimer.h>
+
+
+class QWidget;
+class QWheelEvent;
+class QScrollBar;
+class QResizeEvent;
+
+
+namespace Rosegarden
+{
+
+
+
+/**
+ * A QScrollView with more elaborate auto-scrolling capabilities
+ * and the ability to have a "fixed" (non-scrolling) widget at its bottom,
+ * just above the bottom scrollbar.
+ */
+class RosegardenScrollView : public QScrollView
+{
+    Q_OBJECT
+public:
+    RosegardenScrollView(QWidget* parent=0, const char* name=0, WFlags f=0);
+
+    /**
+     * EditTool::handleMouseMove() returns a OR-ed combination of these
+     * to indicate which direction to scroll to
+     */
+    enum {
+        NoFollow = 0x0,
+        FollowHorizontal = 0x1,
+        FollowVertical = 0x2
+    };
+
+    /**
+     * Sets the canvas width to be exactly the width needed to show
+     * all the items
+     */
+//     void fitWidthToContents();
+
+    /**
+     * Sets the widget which will be between the scrollable part of the view
+     * and the horizontal scrollbar
+     */
+    void setBottomFixedWidget(QWidget*);
+
+    void updateBottomWidgetGeometry();
+
+    /// Map a point with the inverse world matrix
+//     QPoint inverseMapPoint(const QPoint& p) { return inverseWorldMatrix().map(p); }
+
+    void setSmoothScroll(bool s) { m_smoothScroll = s; }
+
+    bool isTimeForSmoothScroll();
+
+    void setScrollDirectionConstraint(int d) { m_scrollDirectionConstraint = d; }
+
+    int getDeltaScroll() { return m_minDeltaScroll; }
+
+    virtual void wheelEvent(QWheelEvent *);
+
+public slots:
+    /**
+     * Scroll horizontally to make the given position visible,
+     * paging to as to get some visibility of the next screenful
+     * (for playback etc)
+     */
+    void slotScrollHoriz(int hpos);
+
+    /**
+     * Scroll horizontally to make the given position somewhat
+     * nearer to visible, scrolling by only "a small distance"
+     * at a time
+     */
+    void slotScrollHorizSmallSteps(int hpos);
+
+    /**
+     * Scroll vertically to make the given position somewhat
+     * nearer to visible, scrolling by only "a small distance"
+     * at a time
+     */
+    void slotScrollVertSmallSteps(int vpos);
+
+    /**
+     * Scroll vertically so as to place the given position
+     * somewhere near the top of the viewport.
+     */
+    void slotScrollVertToTop(int vpos);
+
+    /**
+     * Set the x and y scrollbars to a particular position
+     */
+    void slotSetScrollPos(const QPoint &);
+
+    void startAutoScroll();
+    void startAutoScroll(int directionConstraint);
+    void stopAutoScroll();
+    void doAutoScroll();
+
+    bool isAutoScrolling() const { return m_autoScrolling; }
+
+signals:
+    void bottomWidgetHeightChanged(int);
+
+    void zoomIn();
+    void zoomOut();
+
+protected:
+    
+    virtual void resizeEvent(QResizeEvent*);
+    virtual void setHBarGeometry(QScrollBar &hbar, int x, int y, int w, int h);
+    
+    virtual QScrollBar* getMainHorizontalScrollBar() { return horizontalScrollBar(); }
+
+    //--------------- Data members ---------------------------------
+    enum ScrollDirection { None, Top, Bottom, Left, Right };
+
+    QWidget* m_bottomWidget;
+    int m_currentBottomWidgetHeight;
+
+    bool m_smoothScroll;
+    int m_smoothScrollTimeInterval;
+    float m_minDeltaScroll;
+    QTime m_scrollTimer;
+    QTime m_scrollAccelerationTimer;
+
+    QTimer m_autoScrollTimer;
+    int m_autoScrollTime;
+    int m_autoScrollAccel;
+    QPoint m_previousP;
+    int m_autoScrollXMargin;
+    int m_autoScrollYMargin;
+    ScrollDirection m_currentScrollDirection;
+    int m_scrollDirectionConstraint;
+    bool m_autoScrolling;    
+
+    static const int    DefaultSmoothScrollTimeInterval;
+    static const double DefaultMinDeltaScroll;
+
+    static const int AutoscrollMargin;
+    static const int InitialScrollTime;
+    static const int InitialScrollAccel;
+    static const int MaxScrollDelta;
+    static const double ScrollAccelValue;
+
+};
+
+
+}
+
+#endif