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