//=========================================================
//  MusE
//  Linux Music Editor
//    $Id: canvas.h,v 1.3.2.8 2009/02/02 21:38:01 terminator356 Exp $
//  (C) Copyright 1999 Werner Schweer (ws@seh.de)
//=========================================================

#ifndef __CANVAS_H__
#define __CANVAS_H__

#include "citem.h"
#include "view.h"
#include "tools.h"
//Added by qt3to4:
#include <QWheelEvent>
#include <QMouseEvent>
#include <Q3PopupMenu>
#include <QKeyEvent>

class Q3PopupMenu;

//---------------------------------------------------------
//   Canvas
//---------------------------------------------------------

class Canvas : public View {
      Q_OBJECT
      int canvasTools;
      QTimer *scrollTimer;
      
      bool doScroll;
      int scrollSpeed;

      QPoint ev_pos;
      bool canScrollLeft;
      bool canScrollRight;
      bool canScrollUp;
      bool canScrollDown;
   protected:
      enum DragMode {
            DRAG_OFF, DRAG_NEW,
            DRAG_MOVE_START, DRAG_MOVE,
            DRAG_COPY_START, DRAG_COPY,
            DRAG_CLONE_START, DRAG_CLONE,
            DRAGX_MOVE, DRAGY_MOVE,
            DRAGX_COPY, DRAGY_COPY,
            DRAGX_CLONE, DRAGY_CLONE,
            DRAG_DELETE,
            DRAG_RESIZE, DRAG_LASSO_START, DRAG_LASSO,
            };

      enum DragType {
            MOVE_MOVE, MOVE_COPY, MOVE_CLONE
            };

      enum HScrollDir {
            HSCROLL_NONE, HSCROLL_LEFT, HSCROLL_RIGHT
            };
      enum VScrollDir {
            VSCROLL_NONE, VSCROLL_UP, VSCROLL_DOWN
            };
      
      CItemList items;
      CItemList moving;
      CItem* curItem;
      Part* curPart;
      int curPartId;

      DragMode drag;
      QRect lasso;
      QPoint start;
      Tool _tool;
      unsigned pos[3];
      
      HScrollDir hscrollDir;
      VScrollDir vscrollDir;
      int keyState;
      Q3PopupMenu* itemPopupMenu;
      Q3PopupMenu* canvasPopupMenu;

      void setCursor();
      virtual void viewKeyPressEvent(QKeyEvent* event);
      virtual void viewMousePressEvent(QMouseEvent* event);
      virtual void viewMouseMoveEvent(QMouseEvent*);
      virtual void viewMouseReleaseEvent(QMouseEvent*);
      virtual void draw(QPainter&, const QRect&);
      virtual void wheelEvent(QWheelEvent* e);

      virtual void mousePress(QMouseEvent*) {}
      virtual void keyPress(QKeyEvent*);
      virtual void mouseMove(const QPoint&) = 0;
      virtual void mouseRelease(const QPoint&) {}
      virtual void drawCanvas(QPainter&, const QRect&) = 0;
      virtual void drawItem(QPainter&, const CItem*, const QRect&) = 0;
      virtual void drawMoving(QPainter&, const CItem*, const QRect&) = 0;
      virtual void updateSelection() = 0;
      virtual QPoint raster(const QPoint&) const = 0;
      virtual int y2pitch(int) const = 0; //CDW
      virtual int pitch2y(int) const = 0; //CDW

      virtual void moveCanvasItems(CItemList&, int, int, DragType, int*) = 0;
      // Changed by T356. 
      //virtual bool moveItem(CItem*, const QPoint&, DragType, int*) = 0;
      virtual bool moveItem(CItem*, const QPoint&, DragType) = 0;
      virtual CItem* newItem(const QPoint&, int state) = 0;
      virtual void resizeItem(CItem*, bool noSnap=false) = 0;
      virtual void newItem(CItem*, bool noSnap=false) = 0;
      virtual bool deleteItem(CItem*) = 0;
      virtual void startUndo(DragType) = 0;
      
      virtual void endUndo(DragType, int flags) = 0;
      int getCurrentDrag();

      /*!
         \brief Virtual member

         Implementing class is responsible for creating a popup to be shown when the user rightclicks an item on the Canvas
         \param item The canvas item that is rightclicked
         \return A QPopupMenu*
         */
      virtual Q3PopupMenu* genItemPopup(CItem* /*item*/) { return 0; }

      /*!
         \brief Pure virtual member

         Implementing class is responsible for creating a popup to be shown when the user rightclicks an empty region of the canvas
         \return A QPopupMenu*
         */
      Q3PopupMenu* genCanvasPopup();

      /*!
         \brief Virtual member

         This is the function called when the user has selected an option in the popupmenu generated by genItemPopup()
         \param item the canvas item the whole thing is about
         \param n Command type
         \param pt I think this is the position of the pointer when right mouse button was pressed
         */
      virtual void itemPopup(CItem* /*item */, int /*n*/, const QPoint& /*pt*/) {}
      void canvasPopup(int);

      virtual void startDrag(CItem*, bool) {}

      // selection
      virtual void deselectAll();
      virtual void selectItem(CItem* e, bool);

      virtual void deleteItem(const QPoint&);

      // moving
      void startMoving(const QPoint&, DragType);
      
      void moveItems(const QPoint&, int dir, bool rasterize = true);
      void endMoveItems(const QPoint&, DragType, int dir);

      virtual void selectLasso(bool toggle);

      virtual void itemPressed(const CItem*) {}
      virtual void itemReleased(const CItem*, const QPoint&) {}
      virtual void itemMoved(const CItem*, const QPoint&) {}
      virtual void curPartChanged() {}

   public slots:
      void setTool(int t);
      void setPos(int, unsigned, bool adjustScrollbar);
      void scrollTimerDone(void);
      void redirectedWheelEvent(QWheelEvent*);

   signals:
      void followEvent(int);
      void toolChanged(int);
      void verticalScroll(unsigned);
      void horizontalScroll(unsigned);
      void horizontalScrollNoLimit(unsigned);
   public:
      Canvas(QWidget* parent, int sx, int sy, const char* name = 0);
      bool isSingleSelection();
      int selectionSize();
      Tool tool() const { return _tool; }
      Part* part() const { return curPart; }
      void setCurrentPart(Part*); 
      void setCanvasTools(int n) { canvasTools = n; }
      };
#endif