freebsd-src/lib/libncurses/lib_scroll.c
1995-05-30 05:51:47 +00:00

202 lines
5.3 KiB
C

/* This work is copyrighted. See COPYRIGHT.OLD & COPYRIGHT.NEW for *
* details. If they are missing then this copy is in violation of *
* the copyright conditions. */
/*
** lib_scroll.c
**
** The routine wscrl(win, n).
** positive n scroll the window up (ie. move lines down)
** negative n scroll the window down (ie. move lines up)
**
*/
#include <stdlib.h>
#include "curses.priv.h"
#include "terminfo.h"
void scroll_window(WINDOW *win, int n, int regtop, int regbottom)
{
int line, i;
chtype *ptr, *temp;
chtype **saved;
chtype blank = ' ';
saved = (chtype **)malloc(sizeof(chtype *) * abs(n));
if (n < 0) {
/* save overwritten lines */
for (i = 0; i < -n; i++)
saved[i] = win->_line[regbottom-i];
/* shift n lines */
for (line = regbottom; line >= regtop-n; line--)
win->_line[line] = win->_line[line+n];
/* restore saved lines and blank them */
for (i = 0, line = regtop; line < regtop-n; line++, i++) {
win->_line[line] = saved[i];
temp = win->_line[line];
for (ptr = temp; ptr - temp <= win->_maxx; ptr++)
*ptr = blank;
}
} else {
/* save overwritten lines */
for (i = 0; i < n; i++)
saved[i] = win->_line[regtop+i];
/* shift n lines */
for (line = regtop; line <= regbottom-n; line++)
win->_line[line] = win->_line[line+n];
/* restore saved lines and blank them */
for (i = 0, line = regbottom; line > regbottom - n; line--, i++) {
win->_line[line] = saved[i];
temp = win->_line[line];
for (ptr = temp; ptr - temp <= win->_maxx; ptr++)
*ptr = blank;
}
}
free(saved);
}
int
wscrl(WINDOW *win, int n)
{
int physical = FALSE;
int i;
T(("wscrl(%x,%d) called", win, n));
if (! win->_scroll)
return ERR;
if (n == 0)
return OK;
/* as an optimization, if the scrolling region is the entire screen
scroll the physical screen */
if ( win->_begx == 0 && win->_maxx == columns - 1
&& !memory_above && !memory_below
&& ((((win->_begy+win->_regtop == 0 && win->_begy+win->_regbottom == lines - 1)
|| change_scroll_region)
&& ( (n < 0 && (parm_rindex || scroll_reverse))
|| (n > 0 && (parm_index || scroll_forward))
)
) || (win->_idlok && (parm_insert_line || insert_line)
&& (parm_delete_line || delete_line)
)
)
)
physical = TRUE;
if (physical == TRUE) {
wrefresh(win);
scroll_window(curscr, n, win->_begy+win->_regtop, win->_begy+win->_regbottom);
scroll_window(newscr, n, win->_begy+win->_regtop, win->_begy+win->_regbottom);
}
scroll_window(win, n, win->_regtop, win->_regbottom);
if (physical == TRUE) {
if (n < 0) {
if ( (( win->_begy+win->_regtop == 0
&& win->_begy+win->_regbottom == lines - 1)
|| change_scroll_region)
&& (parm_rindex || scroll_reverse)
) {
if (change_scroll_region &&
(win->_begy+win->_regtop != 0 || win->_begy+win->_regbottom != lines - 1)
)
putp(tparm(change_scroll_region, win->_begy+win->_regtop, win->_begy+win->_regbottom));
i = abs(n);
mvcur(-1, -1, win->_begy+win->_regtop, 0);
if (parm_rindex) {
putp(tparm(parm_rindex, i));
} else if (scroll_reverse) {
while (i--)
putp(scroll_reverse);
}
if (change_scroll_region &&
(win->_begy+win->_regtop != 0 || win->_begy+win->_regbottom != lines - 1)
)
putp(tparm(change_scroll_region, 0, lines-1));
} else {
i = abs(n);
if (win->_begy+win->_regbottom < lines - 1) {
mvcur(-1, -1, win->_begy+win->_regbottom, 0);
if (parm_delete_line) {
putp(tparm(parm_delete_line, i));
} else if (delete_line) {
while (i--)
putp(delete_line);
i = abs(n);
}
}
mvcur(-1, -1, win->_begy+win->_regtop, 0);
if (parm_insert_line) {
putp(tparm(parm_insert_line, i));
} else if (insert_line) {
while (i--)
putp(insert_line);
}
}
} else {
if ( (( win->_begy+win->_regtop == 0
&& win->_begy+win->_regbottom == lines - 1)
|| change_scroll_region)
&& (parm_index || scroll_forward)
) {
if (change_scroll_region &&
(win->_begy+win->_regtop != 0 || win->_begy+win->_regbottom != lines - 1)
)
putp(tparm(change_scroll_region, win->_begy+win->_regtop, win->_begy+win->_regbottom));
mvcur(-1, -1, win->_begy+win->_regbottom, 0);
if (parm_index) {
putp(tparm(parm_index, n));
} else if (scroll_forward) {
i = n;
while (i--)
putp(scroll_forward);
}
if (change_scroll_region &&
(win->_begy+win->_regtop != 0 || win->_begy+win->_regbottom != lines - 1)
)
putp(tparm(change_scroll_region, 0, lines-1));
} else {
mvcur(-1, -1, win->_begy+win->_regtop, 0);
if (parm_delete_line) {
putp(tparm(parm_delete_line, n));
} else if (delete_line) {
i = n;
while (i--)
putp(delete_line);
}
if (win->_begy+win->_regbottom < lines - 1) {
mvcur(win->_begy+win->_regtop, 0, win->_begy+win->_regbottom, 0);
if (parm_insert_line) {
putp(tparm(parm_insert_line, n));
} else if (insert_line) {
i = n;
while (i--)
putp(insert_line);
}
}
}
}
mvcur(-1, -1, win->_begy+win->_cury, win->_begx+win->_curx);
} else
touchline(win, win->_regtop, win->_regbottom - win->_regtop + 1);
return OK;
}