freebsd-dev/lib/libncurses/lib_scroll.c

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/* 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"
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#include "terminfo.h"
void _nc_soft_scroll_window(WINDOW *win, int const n, short const top, short const bottom, chtype blank)
{
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int line, i;
chtype *ptr, *temp;
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chtype **saved;
saved = (chtype **)calloc(abs(n), sizeof(chtype *));
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if (n < 0) {
/* save overwritten lines */
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for (i = 0; i < -n && bottom-i >= 0; i++)
saved[i] = win->_line[bottom-i];
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/* shift n lines */
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for (line = bottom; line >= top-n && line >= 0; line--)
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win->_line[line] = win->_line[line+n];
/* restore saved lines and blank them */
for (i = 0, line = top; line < top-n && line <= win->_maxy; line++, i++) {
if (saved[i])
win->_line[line] = saved[i];
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temp = win->_line[line];
for (ptr = temp; ptr - temp <= win->_maxx; ptr++)
*ptr = blank;
}
} else {
/* save overwritten lines */
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for (i = 0; i < n && top+i <= win->_maxy; i++)
saved[i] = win->_line[top+i];
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/* shift n lines */
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for (line = top; line <= bottom-n && line+n <= win->_maxy; line++)
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win->_line[line] = win->_line[line+n];
/* restore saved lines and blank them */
for (i = 0, line = bottom; line > bottom - n && line >= 0; line--, i++) {
if (saved[i])
win->_line[line] = saved[i];
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temp = win->_line[line];
for (ptr = temp; ptr - temp <= win->_maxx; ptr++)
*ptr = blank;
}
}
/* touchline(win, top, bottom-top+1); */ /* not yet */
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free(saved);
}
void _nc_scroll_window(WINDOW *win, int n, short const top, short const bottom, chtype blank)
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{
int physical = FALSE;
int i;
if (n > lines)
n = lines;
else if (-n > lines)
n = -lines;
/* as an optimization, if the scrolling region is the entire screen
scroll the physical screen */
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if ( top != bottom
&& win->_begx == 0 && win->_maxx == columns - 1
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&& !memory_above && !memory_below
&& ((((win->_begy+top == 0 && win->_begy+bottom == lines - 1)
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|| change_scroll_region)
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&& ( (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;
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if (physical == TRUE) {
wrefresh(win);
_nc_soft_scroll_window(curscr, n, win->_begy+top, win->_begy+bottom, blank);
_nc_soft_scroll_window(newscr, n, win->_begy+top, win->_begy+bottom, blank);
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}
_nc_soft_scroll_window(win, n, top, bottom, blank);
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if (physical == TRUE) {
if (n < 0) {
if ( (( win->_begy+top == 0
&& win->_begy+bottom == lines - 1)
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|| change_scroll_region)
&& (parm_rindex || scroll_reverse)
) {
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if (change_scroll_region &&
(win->_begy+top != 0 || win->_begy+bottom != lines - 1)
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)
putp(tparm(change_scroll_region, win->_begy+top, win->_begy+bottom));
i = abs(n);
mvcur(-1, -1, win->_begy+top, 0);
if (parm_rindex) {
putp(tparm(parm_rindex, i));
} else if (scroll_reverse) {
while (i--)
putp(scroll_reverse);
}
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if (change_scroll_region &&
(win->_begy+top != 0 || win->_begy+bottom != lines - 1)
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)
putp(tparm(change_scroll_region, 0, lines-1));
} else {
i = abs(n);
if (win->_begy+bottom < lines - 1) {
mvcur(-1, -1, win->_begy+bottom, 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+top, 0);
if (parm_insert_line) {
putp(tparm(parm_insert_line, i));
} else if (insert_line) {
while (i--)
putp(insert_line);
}
}
} else {
if ( (( win->_begy+top == 0
&& win->_begy+bottom == lines - 1)
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|| change_scroll_region)
&& (parm_index || scroll_forward)
) {
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if (change_scroll_region &&
(win->_begy+top != 0 || win->_begy+bottom != lines - 1)
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)
putp(tparm(change_scroll_region, win->_begy+top, win->_begy+bottom));
mvcur(-1, -1, win->_begy+bottom, 0);
if (parm_index) {
putp(tparm(parm_index, n));
} else if (scroll_forward) {
i = n;
while (i--)
putp(scroll_forward);
}
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if (change_scroll_region &&
(win->_begy+top != 0 || win->_begy+bottom != lines - 1)
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)
putp(tparm(change_scroll_region, 0, lines-1));
} else {
mvcur(-1, -1, win->_begy+top, 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+bottom < lines - 1) {
mvcur(win->_begy+top, 0, win->_begy+bottom, 0);
if (parm_insert_line) {
putp(tparm(parm_insert_line, n));
} else if (insert_line) {
i = n;
while (i--)
putp(insert_line);
}
}
}
}
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mvcur(-1, -1, win->_begy+win->_cury, win->_begx+win->_curx);
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} else
touchline(win, top, bottom - top + 1);
}
int
wscrl(WINDOW *win, int n)
{
T(("wscrl(%x,%d) called", win, n));
if (!win || !win->_scroll)
return ERR;
if (n == 0)
return OK;
if ((n > (win->_regbottom - win->_regtop)) ||
(-n > (win->_regbottom - win->_regtop)))
return ERR;
_nc_scroll_window(win, n, win->_regtop, win->_regbottom, _nc_background(win));
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return OK;
}