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trackball.H

Go to the documentation of this file.

#ifndef GLUE_TRACKBALL_H
#define GLUE_TRACKBALL_H

#include "event/event.H"
#include "dev/dev.H"
#include "dev/room6d.H"
#include "dev/dev2d.H"

extern DllImpExp cWtransf &Identity;

class DEV2d_6d_agg: public EVENTfilter {
  str_ptr        _tname, _tball_name;
  DEVice_room6d *_tkr;
  DEVice        *_tball;     // possible real source of button events
  EVENTsource    _tball_src; // cached description of button event source
  
  //Trackball event
  //Check to see if trackball exists, and return true if event source exists
  bool     tball_evt(cEVENTptr &evt) { 
    if (!_tball && !(_tball = DEVice::lookup(_tball_name)) 
    && evt->debug_on())
      cerr <<"DEVbtn_tracker_agg: can't find Trackball device "
       << _tball_name << endl;
    return _tball_src.test(*evt->source()) && EVENT2d::isa(evt); 
  }
  

  //Returns the matrix for the tracker
  cWtransf &cur_tracker(bool dbg) { 
    if (!_tkr&&!(_tkr=(DEVice_room6d*)DEVice::lookup(_tname))&&dbg)
      cerr << "DEVbtn_tracker_agg: can't find tracker device "
       << _tname << endl; 
    return _tkr ? _tkr->cur() : Identity; 
  }

public:
  DEV2d_6d_agg(Cstr_ptr &t, Cstr_ptr &b): 
    _tname(t),_tball_name(b),_tkr(0),_tball(0),
    _tball_src(_tball_name,0)    { }
  virtual ~DEV2d_6d_agg()    { }
  
  EVENTptr filter(cEVENTptr &evt) {
    if (tball_evt(evt)) {
      EVENT2dptr  tballevt = EVENT2d::cast(evt);
      return new EVENT2d_6d((DEVice_2d *)(tballevt->source()),
                tballevt->old(),
                tballevt->cur(),
                cur_tracker(evt->debug_on()));
    }
    return evt;
  }
};

#endif

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