151 lines
4.4 KiB
C
151 lines
4.4 KiB
C
/****************************************************************************
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* apps/graphics/pdcurses/pdc_scroll.c
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* Public Domain Curses
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* RCSID("$Id: scroll.c,v 1.36 2008/07/13 16:08:18 wmcbrine Exp $")
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Adapted by: Gregory Nutt <gnutt@nuttx.org>
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*
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* Adapted from the original public domain pdcurses by Gregory Nutt and
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* released as part of NuttX under the 3-clause BSD license:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/* Name: scroll
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*
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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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*
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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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*
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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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*
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* Return Value:
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* All functions return OK on success and ERR on error.
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*
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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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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include "curspriv.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int wscrl(WINDOW *win, int n)
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{
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chtype blank;
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chtype *temp;
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int dir;
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int start;
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int end;
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int l;
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int i;
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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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{
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return ERR;
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}
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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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{
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win->_y[i] = win->_y[i + dir];
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}
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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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{
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*temp++ = blank;
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}
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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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