diff options
Diffstat (limited to 'lib/libncurses/lib_scroll.c')
| -rw-r--r-- | lib/libncurses/lib_scroll.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/lib/libncurses/lib_scroll.c b/lib/libncurses/lib_scroll.c new file mode 100644 index 0000000..3a60836 --- /dev/null +++ b/lib/libncurses/lib_scroll.c @@ -0,0 +1,218 @@ + +/* 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 _nc_soft_scroll_window(WINDOW *win, int const n, short const top, short const bottom, chtype blank) +{ +int line, i; +chtype *ptr, *temp; +chtype **saved; + + saved = (chtype **)calloc(abs(n), sizeof(chtype *)); + + if (n < 0) { + /* save overwritten lines */ + + for (i = 0; i < -n && bottom-i >= 0; i++) + saved[i] = win->_line[bottom-i]; + + /* shift n lines */ + + for (line = bottom; line >= top-n && line >= 0; line--) + 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]; + temp = win->_line[line]; + for (ptr = temp; ptr - temp <= win->_maxx; ptr++) + *ptr = blank; + } + } else { + /* save overwritten lines */ + + for (i = 0; i < n && top+i <= win->_maxy; i++) + saved[i] = win->_line[top+i]; + + /* shift n lines */ + + for (line = top; line <= bottom-n && line+n <= win->_maxy; line++) + 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]; + temp = win->_line[line]; + for (ptr = temp; ptr - temp <= win->_maxx; ptr++) + *ptr = blank; + } + } + /* touchline(win, top, bottom-top+1); */ /* not yet */ + free(saved); +} + +void _nc_scroll_window(WINDOW *win, int n, short const top, short const bottom, chtype blank) +{ +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 */ + + if ( top != bottom + && win->_begx == 0 && win->_maxx == columns - 1 + && !memory_above && !memory_below + && ((((win->_begy+top == 0 && win->_begy+bottom == 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); + _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); + } + _nc_soft_scroll_window(win, n, top, bottom, blank); + + if (physical == TRUE) { + if (n < 0) { + if ( (( win->_begy+top == 0 + && win->_begy+bottom == lines - 1) + || change_scroll_region) + && (parm_rindex || scroll_reverse) + ) { + if (change_scroll_region && + (win->_begy+top != 0 || win->_begy+bottom != lines - 1) + ) + 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); + } + if (change_scroll_region && + (win->_begy+top != 0 || win->_begy+bottom != lines - 1) + ) + 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) + || change_scroll_region) + && (parm_index || scroll_forward) + ) { + if (change_scroll_region && + (win->_begy+top != 0 || win->_begy+bottom != lines - 1) + ) + 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); + } + if (change_scroll_region && + (win->_begy+top != 0 || win->_begy+bottom != lines - 1) + ) + 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); + } + } + } + } + + mvcur(-1, -1, win->_begy+win->_cury, win->_begx+win->_curx); + } 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)); + + return OK; +} |
