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// -*- c-basic-offset: 4 -*-

    A sequencer and musical notation editor.

    This program is Copyright 2000-2006
        Guillaume Laurent   <glaurent@telegraph-road.org>,
        Chris Cannam        <cannam@all-day-breakfast.com>,
        Richard Bown        <bownie@bownie.com>

    The moral right of the authors to claim authorship of this work
    has been asserted.

    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.


#include <vector>

#include "rosegardencanvasview.h"

class NotationElement;
class QCanvasItemGroup;
class QCanvasLineGroupable;
class LinedStaffManager;
class NotationStaff;
class QPaintEvent;

 * Central widget for the NotationView window
 * This class only takes care of the event handling
 * (see the various signals).
 * It does not deal with any canvas element. All elements are added by
 * the NotationView.
 *@see NotationView

00048 class NotationCanvasView : public RosegardenCanvasView

    NotationCanvasView(const LinedStaffManager &staffmgr,
                   QCanvas *viewing, QWidget *parent=0,
                       const char *name=0, WFlags f=0);


    void setHeightTracking(bool t);


     * Emitted when the user clicks on a staff (e.g. mouse button press)
     * \a pitch is set to the MIDI pitch on which the click occurred
     * \a staffNo is set to the staff on which the click occurred
     * \a point is set to the coordinates of the click event
     * \a el points to the NotationElement which was clicked on, if any
    void itemPressed(int pitch, int staffNo,
                     NotationElement* el);

     * Emitted when the user clicks on a QCanvasItem which is active
     * @see QCanvasItem#setActive
    void activeItemPressed(QMouseEvent*,
                           QCanvasItem* item);

     * Emitted when the user clicks on a QCanvasItem which is neither
     * active nor a notation element
    void nonNotationItemPressed(QMouseEvent *,
                        QCanvasItem *);

     * Emitted when the user clicks on a QCanvasItem which is a
     * plain QCanvasText
    void textItemPressed(QMouseEvent *,
                   QCanvasItem *);

     * Emitted when the mouse cursor moves to a different height
     * on the staff
     * \a noteName contains the MIDI name of the corresponding note
    void hoveredOverNoteChanged(const QString &noteName);

     * Emitted when the mouse cursor moves to a note which is at a
     * different time
     * \a time is set to the absolute time of the note the cursor is
     * hovering on
    void hoveredOverAbsoluteTimeChanged(unsigned int time);

     * Emitted when the mouse cursor moves (used by the selection tool)
    void mouseMoved(QMouseEvent*);

     * Emitted when the mouse button is released
    void mouseReleased(QMouseEvent*);

     * Emitted when a region is about to be drawn by the canvas view.
     * Indicates that any on-demand rendering for that region should
     * be carried out.
    void renderRequired(double cx0, double cx1);

public slots:
     void slotRenderComplete();

    virtual void viewportPaintEvent(QPaintEvent *e);
    virtual void drawContents(QPainter *p, int cx, int cy, int cw, int ch);

    const LinedStaffManager &m_linedStaffManager;

     * Callback for a mouse button press event in the canvas
    virtual void contentsMousePressEvent(QMouseEvent*);

     * Callback for a mouse button release event in the canvas
    virtual void contentsMouseReleaseEvent(QMouseEvent*);

     * Callback for a mouse move event in the canvas
    virtual void contentsMouseMoveEvent(QMouseEvent*);

     * Callback for a mouse double click event in the canvas
    virtual void contentsMouseDoubleClickEvent(QMouseEvent*);

    void processActiveItems(QMouseEvent*, QCanvasItemList);

    void handleMousePress(int height, int staffNo,
                          NotationElement* pressedNotationElement = 0);

    bool posIsTooFarFromStaff(const QPoint &pos);

    int getLegerLineCount(int height, bool &offset);

    void setHeightMarkerHeight(QMouseEvent *e);

    NotationElement *getElementAtXCoord(QMouseEvent *e);

    //--------------- Data members ---------------------------------

    int m_lastYPosNearStaff;

    unsigned int m_staffLineThreshold; 

    NotationStaff *m_currentStaff;
    int m_currentHeight;

    QCanvasItemGroup *m_heightMarker;
    QCanvasLineGroupable *m_vert1;
    QCanvasLineGroupable *m_vert2;
    std::vector<QCanvasLineGroupable *> m_legerLines;
    bool m_legerLineOffset;

    bool m_heightTracking;

    QRect m_lastRender;


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