Category : C Source Code
Archive   : WTWG12B.ZIP
Filename : WMOUSELM.C

/* wmouse_limit ()
* routine to limit mouse movement to the current window.
* PARAMETER = OFF (=0) turns off limitation, mouse may roam freely
* = ON limits mouse to current window.
*/
#include "wsys.h"


/* values for mouse driver to set limits
*/
#define X_LIMIT 0x07
#define Y_LIMIT 0x08


static void W_NEAR setlimit ( int min, int max, int xy, int charsize);

void wmouse_limit (int); /* ON=limit to current window */
void wmouse_limit (int onoff)
{
int max, min;


/* calc max & min in mickeys ( see wmouse.c for relation to mickeys )
*/
if ( onoff )
{
/* setting limits ON
*/
min = w0->winleft;
max = w0->winxmax + min;
}
else
{
/* setting limits OFF
*/
min = 0;
max = wxabsmax;
}


setlimit ( min, max, X_LIMIT, wpxchar );





/* now do same for y-coord */

if ( onoff )
{
/* setting limits ON
*/
min = w0->winleft;
max = w0->winymax + min;
}
else
{
/* setting limits OFF
*/
min = 0;
max = wyabsmax;
}
setlimit ( min, max, Y_LIMIT, wpychar );


return; /* wmouse_limit */
}


static void W_NEAR setlimit ( int min, int max, int xy, int charsize )
{
PSEUDOREGS

if ( wmode == 'T' )
{
/* in text modes, 8 mickeys per character onscreen.
*/
min *= 8;
max *= 8;
}
#ifndef TEXTONLY
else
{
min *= charsize;
++max; /* include all bits of last character in gr. mode */
max *= charsize;
}

#endif /* TEXTONLY */


_DX = max;
_CX = min;
_AX = xy;
INTERRUPT ( 0x33 );




return; /* setlimit */
}

/*------------------- end of WMOUSELM.C ------------------*/