99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
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/* Public Domain Curses */
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#include <curspriv.h>
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RCSID("$Id: scroll.c,v 1.36 2008/07/13 16:08:18 wmcbrine Exp $")
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/*man-start**************************************************************
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Name: scroll
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Synopsis:
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int scroll(WINDOW *win);
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int scrl(int n);
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int wscrl(WINDOW *win, int n);
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Description:
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scroll() causes the window to scroll up one line. This involves
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moving the lines in the window data strcture.
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With a positive n, scrl() and wscrl() scroll the window up n
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lines (line i + n becomes i); otherwise they scroll the window
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down n lines.
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For these functions to work, scrolling must be enabled via
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scrollok(). Note also that scrolling is not allowed if the
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supplied window is a pad.
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Return Value:
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All functions return OK on success and ERR on error.
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Portability X/Open BSD SYS V
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scroll Y Y Y
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scrl Y - 4.0
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wscrl Y - 4.0
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**man-end****************************************************************/
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int wscrl(WINDOW *win, int n)
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{
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int i, l, dir, start, end;
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chtype blank, *temp;
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/* Check if window scrolls. Valid for window AND pad */
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if (!win || !win->_scroll || !n)
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return ERR;
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blank = win->_bkgd;
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if (n > 0)
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{
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start = win->_tmarg;
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end = win->_bmarg;
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dir = 1;
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}
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else
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{
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start = win->_bmarg;
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end = win->_tmarg;
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dir = -1;
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}
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for (l = 0; l < (n * dir); l++)
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{
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temp = win->_y[start];
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/* re-arrange line pointers */
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for (i = start; i != end; i += dir)
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win->_y[i] = win->_y[i + dir];
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win->_y[end] = temp;
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/* make a blank line */
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for (i = 0; i < win->_maxx; i++)
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*temp++ = blank;
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}
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touchline(win, win->_tmarg, win->_bmarg - win->_tmarg + 1);
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PDC_sync(win);
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return OK;
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}
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int scrl(int n)
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{
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PDC_LOG(("scrl() - called\n"));
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return wscrl(stdscr, n);
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}
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int scroll(WINDOW *win)
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{
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PDC_LOG(("scroll() - called\n"));
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return wscrl(win, 1);
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}
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