iiscell.h

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#include <qmainwindow.h>
#include <qtable.h>
#include <queue>
#include "value.h"
#include "ranges.h"
#include "PetriNets/place.h"

class CallMember;

//---------------------------------------------------------------
//                          SpreadSheet Cell
//---------------------------------------------------------------

class IisCell: public QTableItem
{
  friend class CallMember;
 public:
  typedef void (IisCell::*member)();
 private:
  void link(AbstractPlace&, member);
  void queueCall(CallMember* m);
  void flushCalls();
 private:
  Place<QString> entered;       // the entered text
  
  Place<Value*>  formule;       // the underlying formule
  
  Place<Value*>  value;         // the computed value

  Place<QImage>  image;         // the visualized image
  
  Place<bool>    show_status;   // true when entered string should be shown

  Place<QString> show;        // the visualized text
  
  void image_changed();
  
  void show_changed();

  void visual_changed();

  void show_value();

  int     scale_xs;

  int     scale_ys;  // if scale_xs & ys are consistent with the width & height 

  QImage  scaled;    // then scaled contains the scaled image
  
 private:
  
  list<IisCell*> listeners;
  
  list<IisCell*> inputs;

  void gather_inputs(Value * v);

  void add_listener(IisCell *who);

  void del_listener(IisCell *who);

  void mark_inputs(bool add);

  void clear_inputs();
  
  void set_inputs();

  void updated();

  void value_changed();

  void formule_changed();

  void show_status_changed();

  Place<bool> needs_recalculation;

  void recalc_changed();
 public: 

  void mark_recalc();

 private:
  bool user_input_allowed;
  
 public:
  bool needs_user_input();

  void mark_allow_ui();

 protected:
  bool will_influence(IisCell *);
  bool will_loop();
 public:

  IisCell::IisCell(QTable * table, EditType et);
  
  virtual void setText ( const QString & str);

 private:
  
  void entered_changed();

 public:
   void recalc();
   
   bool can_be_calculated_now();
 public:
   QString getFormuleTextForCell(int x, int y);

   QWidget * createEditor () const;

   void rowsInserted(int row, int nr);

   void colsInserted(int col, int nr);

   virtual void paint (QPainter * p, const QColorGroup & cg, const QRect & cr, bool selected);

   Data saveFile(QString prefix);

   void load(Data data);

 private:
   Value * evaluate(Value * what);

   Value * lookup(Reference * var);
   
   Value * lookup(Range * var);
   
   Value * fetch_value();

   Value * apply(Expression * what);
};

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