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                        kmmtimeline.h  -  description
  begin                : Fri Feb 15 2002
  copyright            : (C) 2002 by Jason Wood
  email                : jasonwood@blueyonder.co.uk

 *                                                                         *
 *   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.                                   *
 *                                                                         *


#include <qvaluelist.h>
#include <qvbox.h>
#include <qdom.h>
#include <qtimer.h>

#include "gentime.h"
#include "dynamicToolTip.h"
#include "ktrackpanel.h"

class QHBox;
class QScrollView;
class QScrollBar;
class KMacroCommand;
class KCommand;

namespace Command {
    class KMoveClipsCommand;
} namespace Gui {

    class KTrackView;
    class KScalableRuler;

/** This is the timeline. It gets populated by tracks, which in turn are populated
  * by video and audio clips, or transitional clips, or any other clip imaginable.
  * @author Jason Wood

00048     class KTimeLine:public QVBox {
      Q_OBJECT public:
      KTimeLine(QWidget * rulerToolWidget, QWidget * scrollToolWidget,
          QWidget * parent = 0, const char *name = 0);
      The snap tolerance specifies how many pixels away a selection is from a
      snap point before the snap takes effect.

      FIXME : this should not be *quite* as public as this :-/
00059       static uint snapTolerance;

      /** Clear all tracks from the timeline. */
      void clearTrackList();

      void resizeTracks();

      /** This method adds a new track to the trackGrid. */
      void appendTrack(KTrackPanel * track);

      void resizeEvent(QResizeEvent * event);

      /** Inserts a track at the position specified by index */
      void insertTrack(int index, KTrackPanel * track);

      /** No descriptions */
      void polish();

      /** Returns m_trackList
      Warning - this method is a bit of a hack, not good OOP practice, and should be removed at
      some point. */
       QPtrList < KTrackPanel > &trackList();

      /** Returns the seek position of the timeline - this is the currently playing frame, or
      the currently seeked frame. */
      GenTime seekPosition() const;
      int localSeekPosition() const;
      int selectedTrack();
      void selectNextTrack();
      void selectPreviousTrack();
        void selectTrack(int ix);
      void drawSelection(QPoint start, QPoint end);
        void finishMultiSelection(QPoint start, QPoint end);

      //Returns the inpoint/outpoing position of the timeline
      GenTime inpointPosition() const;
      GenTime outpointPosition() const;
      GenTime midpointPosition() const;
      //set difference between mid point slider and inpoint/outpoint
      void setMidValueDiff(const GenTime & time);

      /** Set the current edit mode of the timeline */
      void setEditMode(const QString & editMode);

      /** Returns the edit mode of the timeline. */
      const QString & editMode() const;

      /** Returns the correct "time under mouse", taking into account whether or not snap to frame is on or off, and other relevant effects. */
      GenTime timeUnderMouse(double posX);

      Takes the value that we wish to find the coordinate for, and returns the x
      coordinate. In cases where a single value covers multiple pixels, the left-most
      pixel is returned.
      double mapValueToLocal(double value) const;

      /** This method maps a local coordinate value to the corresponding
      value that should be represented at that position. By using this, there is no need to
      calculate scale factors yourself. Takes the x coordinate, and returns the value associated
      with it.
      double mapLocalToValue(double coordinate) const;

      Returns true if we should snap to clip borders
      bool snapToBorders() const;
      Returns true if we snap to frames
      bool snapToFrame() const;
      Set whether or not we snap to frames.
      void setSnapToFrame(bool snapToFrame);

      Set whether or not we snap to borders.
      void setSnapToBorder(bool snapToBorder);

      Set whether or not we snap to markerss.
      void setSnapToMarker(bool snapToMarker);

      Returns true if we snap to seek times
      bool snapToSeekTime() const;
      Returns true if we snap to markers.
      bool snapToMarkers() const;

      /** Return the current length of the project */
      GenTime projectLength() const;

      KTrackView *trackView() {
          return m_trackViewArea;
      /** Return the scroll threshold - the number of pixels at either side of the timeline that will start the display scrolling. */
          uint scrollThreshold() const;

      /** Return the timer delay - the number of milliseconds between "paging" increments. */
      uint scrollTimerDelay() const;

      /** If we are in the scrolling region, we start the scroll timer, else we stop it */
      void checkScrolling(const QPoint & pos);

      /** Stop the scroll timer */
      void stopScrollTimer();

      /** Set the width of the panels that accompany the timeline's tracks. This also affects the width
      of the ruler widget and the scrollbar widget.*/
      void setPanelWidth(int width);
        void placeScrollBar(int pos);
        int scrollBarPosition();

      /** Return the list of all timeline guides */
      QValueList < int > timelineGuides();
      QStringList timelineRulerComments();
      QDomDocument xmlGuides();
      void guidesFromXml(QDomElement doc);

      /** @returns the ruler tool widget. */
00188        QWidget * rulerToolWidget() const {
          return m_rulerToolWidget;
      /** @returns the frames Per Second of this timeline. */
00192           double framesPerSecond() const {
          return m_framesPerSecond;
      /** Returns the width of the view area. The view area is the area of the timeline where clips and tracks reside.
        * @returns the width of the view area. */
          int viewWidth() const;

      /** GUI elements */
00202       QHBox * m_rulerBox;     // Horizontal box holding the ruler
      QScrollView *m_trackScroll;   // Scrollview holding the tracks
      QHBox *m_scrollBox;     // Horizontal box holding the horizontal scrollbar.
      /** A custom widget that can appear to the side of the ruler. */
00206       QWidget *m_rulerToolWidget;
      KScalableRuler *m_ruler;
      QWidget *m_scrollToolWidget;  // This widget is supplied by the constructor and appears to the left of the bottom scrollbar.
      QScrollBar *m_scrollBar;      // this scroll bar's movement is measured in pixels, not frames.
      int m_scrollValue;            // The position of scroll bar before last movement.
      /** track varables */
00212        QPtrList < KTrackPanel > m_trackList;

      /** The track view area is the area under the ruler where tracks are displayed. */
00215       KTrackView *m_trackViewArea;

      /** Timer for timeline scroll functionality */
00218       QTimer m_scrollTimer;

      /** Controls scroll direction. */
00221       bool m_scrollingRight;

      /** The frames-per-second that the timeline works at. */
00224       double m_framesPerSecond;
      // We snap to frame if this is true;
      bool m_snapToFrame;
      bool m_snapToBorder;
      bool m_snapToMarker;

      /** Current edit mode */
00231       QString m_editMode;

      /** The width of the panels at the left hand side of the timeline. */
00234       int m_panelWidth;
      int m_selectedTrack;

      /** difference between midpoint and inpoint/outpoint when inpoint or outpoint moved */
00238       GenTime m_midPoint;
      DynamicToolTip *ruler_tips;

    public slots:       // Public slots
      /** Update the back buffer for the track views, and tell the trackViewArea widget to
      repaint itself. */
      void drawTrackViewBackBuffer(int startTrack = 0, int endTrack = -1);
      void scrollTrackViewBackBuffer(int value);
      /** Update the back buffer for the track views, and tell the trackViewArea widget to
      repaint itself. */
      void drawPartialTrackViewBackBuffer(int start, int end, int startTrack = 0, int endTrack = -1);
      /** Udate only the track which contains selected clip */
      void drawCurrentTrack(int track, int offset = 0, GenTime start = GenTime(0), GenTime end = GenTime(0));
      void drawPartialTrack(int track, GenTime start = GenTime(0), GenTime end = GenTime(0));
      /** Sets a new time scale for the timeline. This in turn calls the correct kruler funtion and
      updates the display. */
      void setTimeScale(double scale);
        /** Get the current timescale */
        double timeScale();
      /** Set the length of the project */
      void slotSetProjectLength(const GenTime & size);
      /** A ruler slider has moved - do something! */
      void slotSliderMoved(int slider, int value);
      /** Seek the timeline to the current position. */
      void seek(const GenTime & time);
      //move horizontal slider to the current position based on inpoint/outpoint -reh
      void horizontalSlider(const GenTime & inpoint, const GenTime & outpoint);
      void slotActivateSlider(int slider);
      /** Scroll the timeline left */
      void slotScrollLeft();
      /** Scroll the timeline Right */
      void slotScrollRight();
      void slotScrollUp();
      void slotScrollDown();
      void slotDeleteGuide(double currentPos = 0);
      void slotAddGuide();
      void slotSetVZone(QValueList < QPoint > zones);
      void insertSilentGuide(int frame, QString comment);
      void slotEditGuide(double currentPos = 0);
        GenTime guideTime(int ix);

      /** Set the number of frames per second */
      void slotSetFramesPerSecond(double fps);

      /** Re-syncs the scrollbar project size with the ruler project size. */
      void resetProjectSize();

      //set inpoint/outpoint -reh
      void setInpointTimeline(const GenTime & inpoint);
      void setOutpointTimeline(const GenTime & outpoint);
      //get difference between inpoint or outpoint and midpoint when inpoint/outpoint slider moved
      void setMidValueDiff();
      /** automatically scroll the timeline while playing */
      void autoScroll();
      /** automatically scroll the timeline to make sure cursor is visible*/
      void ensureCursorVisible();
      void slotHeaderRightButtonPressed();
      void gotoGuide(int ix);
      void clearGuides();

    private slots:            // Private slots
      /** Scroll the timeline by a set amount. Should be connected to m_scrollTimer */
      void slotTimerScroll();
      /** Collapse selected track */
      void collapseTrack(KTrackPanel * panel, bool);
        void slotMoveForward(bool fast);
        void slotMoveBackward(bool fast);
    signals:            // Signals
      /** Emitted when the seek position on the timeline changes. */
      void seekPositionChanged(const GenTime &);
      //Emitted when the inpoint changes
      void inpointPositionChanged(const GenTime &);
      //Emitted when the outpoint changes
      void outpointPositionChanged(const GenTime &);
      /** Emitted when the right mouse button is pressed over the timeline. */
      void rightButtonPressed();
      /** Emitted when the right mouse button is pressed over the tracks header. */
      void headerRightButtonPressed();
      /** Emitted when the right mouse button is pressed over the timeline ruler. */
      void rulerRightButtonPressed();

}                       // namespace Gui


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