Code Capsules

Listing 14 Adds implementation to complete the Cursor namespace

// cursor.cpp

#include <dos.h>
#include "cursor.h"
#include "video.h"

namespace Cursor
{
   int state = init();
   
   int init()
   {
      // Start with a line cursor
      line();
      return LINE;
   }
   
   void set(unsigned start, unsigned stop)
   {
      union REGS r;
      
      r.h.ah = 1;
      r.h.ch = (unsigned char) start;
      r.h.cl = (unsigned char) stop;
      int86(0x10,&r,&r);
   }
   
   void block()
   {
      switch(Video::type())
      {
      case Video::COLOR:
         set(2,7);
         break;
      
      case Video::MONO:
         set(2,13);
         break;
      }
      state = BLOCK;
   }
   
   void line()
   {
      switch(Video::type())
      {
      case Video::COLOR:
         set(6,7);
         break;
      
      case Video::MONO:
         set(12,13);
         break;
      }
      state = LINE;
   }
   
   void flip()
   {
      state = !state;
      
      switch(state)
      {
      case LINE:
         line();
         break;
      
      case BLOCK:
         block();
         break;
      }
   }
   
   void off()
   {
      set(15,0);
   }
   
   void setpos(int row, int col)
   {
      union REGS r;
      
      r.x.ax = 0x0200;
      r.x.bx = 0;
      r.h.dh = (unsigned char) row;
      r.h.dl = (unsigned char) col;
      int86(0x10,&r,&r);
   }
   
   void getpos(int& row, int& col)
   {
      union REGS r;
      
      r.x.ax = 0x0300;
      r.x.bx = 0;
      int86(0x10,&r,&r);
      row = r.h.dh;
      col = r.h.dl;
   }
}

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