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discrete_btns.H

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#ifndef _discrete_btns_H_
#define _discrete_btns_H_

#include "dev/buttons.H"
#include "dev/discrete_contact.H"

//
// This device maps from the discrete_contact device into a pseudo-button
// device that reports button events corresponding to given pseudo-button
// specifications. Each pseudo-button specification is a pair of an interest
// mask and a resulting value; the button is considered to be on if any set in 
// the state of the device, anded with the mask equals the resulting value.
//

class DEVdiscrete_btns : public EVENThandler {
 public:
   typedef EVENTdiscrete_contact::bits bits;
 protected:
   ARRAY<bits>          _masks;
   ARRAY<bits>          _results;
   ARRAY<DEVice_btn *>  _buttons;
   DEVdiscrete_contact &_dcsource;
 public:
            DEVdiscrete_btns(DEVdiscrete_contact &dc) : _dcsource(dc) 
                                             { dc.add_handler(this); }
   virtual ~DEVdiscrete_btns()               { _dcsource.rem_handler(this);}

   //
   // If you add two buttons with the same id, they'll both be added and
   // operate separately, but deleting it will only delete the first one
   // left.
   //
   void add(DEVice_btn *btn, const bits &mask, const bits &result) {
                                     _buttons += btn;
                                     _masks   += mask; 
                                     _results += result; }
   void del(DEVice_btn *btn)       { int i = _buttons.get_index(btn);
                                     _masks.  remove(i); 
                                     _results.remove(i); 
                                     _buttons -= btn; }

   /* -------------- EVENThandler methods --------------- */

   virtual void handle_event(cEVENTptr &e);
};

#endif

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