/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam and QMUL.
    
    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 _PANE_H_
#define _PANE_H_

#include <QFrame>
#include <QPoint>

#include "base/ZoomConstraint.h"
#include "View.h"
#include "base/Selection.h"

class QWidget;
class QPaintEvent;
class Layer;
class Thumbwheel;
class Panner;
class NotifyingPushButton;
class KeyReference;

class Pane : public View
{
    Q_OBJECT

public:
    Pane(QWidget *parent = 0);
    virtual QString getPropertyContainerIconName() const { return "pane"; }

    virtual bool shouldIlluminateLocalFeatures(const Layer *layer,
					       QPoint &pos) const;
    virtual bool shouldIlluminateLocalSelection(QPoint &pos,
						bool &closeToLeft,
						bool &closeToRight) const;

    void setCentreLineVisible(bool visible);
    bool getCentreLineVisible() const { return m_centreLineVisible; }

    virtual size_t getFirstVisibleFrame() const;

    virtual size_t getVerticalScaleWidth() const;

    virtual QImage *toNewImage(size_t f0, size_t f1);
    virtual QImage *toNewImage() { return View::toNewImage(); }
    virtual QSize getImageSize(size_t f0, size_t f1);
    virtual QSize getImageSize() { return View::getImageSize(); }

    virtual void toXml(QTextStream &stream, QString indent = "",
                       QString extraAttributes = "") const;

    static void registerShortcuts(KeyReference &kr);

signals:
    void paneInteractedWith();
    void rightButtonMenuRequested(QPoint position);
    void dropAccepted(QStringList uriList);
    void dropAccepted(QString text);

public slots:
    virtual void toolModeChanged();
    virtual void zoomWheelsEnabledChanged();
    virtual void viewZoomLevelChanged(View *v, unsigned long z, bool locked);
    virtual void modelAlignmentCompletionChanged();

    virtual void horizontalThumbwheelMoved(int value);
    virtual void verticalThumbwheelMoved(int value);
    virtual void verticalZoomChanged();
    virtual void verticalPannerMoved(float x, float y, float w, float h);
    virtual void editVerticalPannerExtents();

    virtual void layerParametersChanged();

    virtual void propertyContainerSelected(View *, PropertyContainer *pc);

    void mouseEnteredWidget();
    void mouseLeftWidget();

protected:
    virtual void paintEvent(QPaintEvent *e);
    virtual void mousePressEvent(QMouseEvent *e);
    virtual void mouseReleaseEvent(QMouseEvent *e);
    virtual void mouseMoveEvent(QMouseEvent *e);
    virtual void mouseDoubleClickEvent(QMouseEvent *e);
    virtual void enterEvent(QEvent *e);
    virtual void leaveEvent(QEvent *e);
    virtual void wheelEvent(QWheelEvent *e);
    virtual void resizeEvent(QResizeEvent *e);
    virtual void dragEnterEvent(QDragEnterEvent *e);
    virtual void dropEvent(QDropEvent *e);

    void drawVerticalScale(QRect r, Layer *, QPainter &);
    void drawFeatureDescription(Layer *, QPainter &);
    void drawCentreLine(int, QPainter &, bool omitLine);
    void drawDurationAndRate(QRect, const Model *, int, QPainter &);
    void drawWorkTitle(QRect, QPainter &, const Model *);
    void drawLayerNames(QRect, QPainter &);
    void drawEditingSelection(QPainter &);
    void drawAlignmentStatus(QRect, QPainter &, const Model *, bool down);

    virtual bool render(QPainter &paint, int x0, size_t f0, size_t f1);

    Selection getSelectionAt(int x, bool &closeToLeft, bool &closeToRight) const;

    bool editSelectionStart(QMouseEvent *e);
    bool editSelectionDrag(QMouseEvent *e);
    bool editSelectionEnd(QMouseEvent *e);
    bool selectionIsBeingEdited() const;

    void updateHeadsUpDisplay();
    void updateVerticalPanner();

    bool canTopLayerMoveVertical();
    bool getTopLayerDisplayExtents(float &valueMin, float &valueMax,
                                   float &displayMin, float &displayMax,
                                   QString *unit = 0);
    bool setTopLayerDisplayExtents(float displayMin, float displayMax);

    void dragTopLayer(QMouseEvent *e);
    void dragExtendSelection(QMouseEvent *e);
    void zoomToRegion(int x0, int y0, int x1, int y1);
    void updateContextHelp(const QPoint *pos);
    void edgeScrollMaybe(int x);

    bool m_identifyFeatures;
    QPoint m_identifyPoint;
    QPoint m_clickPos;
    QPoint m_mousePos;
    bool m_clickedInRange;
    bool m_shiftPressed;
    bool m_ctrlPressed;
    bool m_altPressed;

    bool m_navigating;
    bool m_resizing;
    bool m_editing;
    bool m_releasing;
    size_t m_dragCentreFrame;
    float m_dragStartMinValue;
    bool m_centreLineVisible;
    size_t m_selectionStartFrame;
    Selection m_editingSelection;
    int m_editingSelectionEdge;
    mutable int m_scaleWidth;

    enum DragMode {
        UnresolvedDrag,
        VerticalDrag,
        HorizontalDrag,
        FreeDrag
    };
    DragMode m_dragMode;

    DragMode updateDragMode(DragMode currentMode,
                            QPoint origin,
                            QPoint currentPoint,
                            bool canMoveHorizontal,
                            bool canMoveVertical,
                            bool resistHorizontal,
                            bool resistVertical);

    QWidget *m_headsUpDisplay;
    Panner *m_vpan;
    Thumbwheel *m_hthumb;
    Thumbwheel *m_vthumb;
    NotifyingPushButton *m_reset;

    bool m_mouseInWidget;

    static QCursor *m_measureCursor1;
    static QCursor *m_measureCursor2;
};

#endif