diff options
Diffstat (limited to 'ncurses-5.3/ncurses/base/lib_pad.c')
| -rw-r--r-- | ncurses-5.3/ncurses/base/lib_pad.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/ncurses-5.3/ncurses/base/lib_pad.c b/ncurses-5.3/ncurses/base/lib_pad.c new file mode 100644 index 0000000..3005f06 --- /dev/null +++ b/ncurses-5.3/ncurses/base/lib_pad.c @@ -0,0 +1,313 @@ +/**************************************************************************** + * Copyright (c) 1998-2001,2002 Free Software Foundation, Inc. * + * * + * Permission is hereby granted, free of charge, to any person obtaining a * + * copy of this software and associated documentation files (the * + * "Software"), to deal in the Software without restriction, including * + * without limitation the rights to use, copy, modify, merge, publish, * + * distribute, distribute with modifications, sublicense, and/or sell * + * copies of the Software, and to permit persons to whom the Software is * + * furnished to do so, subject to the following conditions: * + * * + * The above copyright notice and this permission notice shall be included * + * in all copies or substantial portions of the Software. * + * * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * + * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * + * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * + * * + * Except as contained in this notice, the name(s) of the above copyright * + * holders shall not be used in advertising or otherwise to promote the * + * sale, use or other dealings in this Software without prior written * + * authorization. * + ****************************************************************************/ + +/**************************************************************************** + * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * + * and: Eric S. Raymond <esr@snark.thyrsus.com> * + ****************************************************************************/ + +/* + * lib_pad.c + * newpad -- create a new pad + * pnoutrefresh -- refresh a pad, no update + * pechochar -- add a char to a pad and refresh + */ + +#include <curses.priv.h> + +MODULE_ID("$Id$") + +NCURSES_EXPORT(WINDOW *) +newpad(int l, int c) +{ + WINDOW *win; + NCURSES_CH_T *ptr; + int i; + + T((T_CALLED("newpad(%d, %d)"), l, c)); + + if (l <= 0 || c <= 0) + returnWin(0); + + if ((win = _nc_makenew(l, c, 0, 0, _ISPAD)) == NULL) + returnWin(0); + + for (i = 0; i < l; i++) { + if_USE_SCROLL_HINTS(win->_line[i].oldindex = _NEWINDEX); + if ((win->_line[i].text = typeCalloc(NCURSES_CH_T, ((size_t) c))) == 0) { + (void) _nc_freewin(win); + returnWin(0); + } + for (ptr = win->_line[i].text; ptr < win->_line[i].text + c; ptr++) + SetChar(*ptr, BLANK_TEXT, BLANK_ATTR); + } + + returnWin(win); +} + +NCURSES_EXPORT(WINDOW *) +subpad +(WINDOW *orig, int l, int c, int begy, int begx) +{ + WINDOW *win = (WINDOW *) 0; + + T((T_CALLED("subpad(%d, %d)"), l, c)); + + if (orig) { + if (!(orig->_flags & _ISPAD) + || ((win = derwin(orig, l, c, begy, begx)) == NULL)) + returnWin(0); + } + returnWin(win); +} + +NCURSES_EXPORT(int) +prefresh +(WINDOW *win, int pminrow, int pmincol, + int sminrow, int smincol, int smaxrow, int smaxcol) +{ + T((T_CALLED("prefresh()"))); + if (pnoutrefresh(win, pminrow, pmincol, sminrow, smincol, smaxrow, + smaxcol) != ERR + && doupdate() != ERR) { + returnCode(OK); + } + returnCode(ERR); +} + +NCURSES_EXPORT(int) +pnoutrefresh +(WINDOW *win, int pminrow, int pmincol, + int sminrow, int smincol, int smaxrow, int smaxcol) +{ + NCURSES_SIZE_T i, j; + NCURSES_SIZE_T m, n; + NCURSES_SIZE_T pmaxrow; + NCURSES_SIZE_T pmaxcol; + +#if USE_SCROLL_HINTS + const int my_len = 2; /* parameterize the threshold for hardscroll */ + NCURSES_SIZE_T displaced; + bool wide; +#endif + + T((T_CALLED("pnoutrefresh(%p, %d, %d, %d, %d, %d, %d)"), + win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol)); + + if (win == 0) + returnCode(ERR); + + if (!(win->_flags & _ISPAD)) + returnCode(ERR); + + /* negative values are interpreted as zero */ + if (pminrow < 0) + pminrow = 0; + if (pmincol < 0) + pmincol = 0; + if (sminrow < 0) + sminrow = 0; + if (smincol < 0) + smincol = 0; + + pmaxrow = pminrow + smaxrow - sminrow; + pmaxcol = pmincol + smaxcol - smincol; + + T((" pminrow + smaxrow - sminrow %d, win->_maxy %d", pmaxrow, win->_maxy)); + T((" pmincol + smaxcol - smincol %d, win->_maxx %d", pmaxcol, win->_maxx)); + + /* + * Trim the caller's screen size back to the actual limits. + */ + if (pmaxrow > win->_maxy) { + smaxrow -= (pmaxrow - win->_maxy); + pmaxrow = pminrow + smaxrow - sminrow; + } + if (pmaxcol > win->_maxx) { + smaxcol -= (pmaxcol - win->_maxx); + pmaxcol = pmincol + smaxcol - smincol; + } + + if (smaxrow >= screen_lines + || smaxcol >= screen_columns + || sminrow > smaxrow + || smincol > smaxcol) + returnCode(ERR); + + T(("pad being refreshed")); + +#if USE_SCROLL_HINTS + if (win->_pad._pad_y >= 0) { + displaced = pminrow - win->_pad._pad_y + - (sminrow - win->_pad._pad_top); + T(("pad being shifted by %d line(s)", displaced)); + } else + displaced = 0; +#endif + + /* + * For pure efficiency, we'd want to transfer scrolling information + * from the pad to newscr whenever the window is wide enough that + * its update will dominate the cost of the update for the horizontal + * band of newscr that it occupies. Unfortunately, this threshold + * tends to be complex to estimate, and in any case scrolling the + * whole band and rewriting the parts outside win's image would look + * really ugly. So. What we do is consider the pad "wide" if it + * either (a) occupies the whole width of newscr, or (b) occupies + * all but at most one column on either vertical edge of the screen + * (this caters to fussy people who put boxes around full-screen + * windows). Note that changing this formula will not break any code, + * merely change the costs of various update cases. + */ +#if USE_SCROLL_HINTS + wide = (smincol < my_len && smaxcol > (newscr->_maxx - my_len)); +#endif + + for (i = pminrow, m = sminrow + win->_yoffset; + i <= pmaxrow && m <= newscr->_maxy; + i++, m++) { + register struct ldat *nline = &newscr->_line[m]; + register struct ldat *oline = &win->_line[i]; + for (j = pmincol, n = smincol; j <= pmaxcol; j++, n++) { + NCURSES_CH_T ch = oline->text[j]; +#if USE_WIDEC_SUPPORT + /* + * Special case for leftmost character of the displayed area. + * Only half of a double-width character may be visible. + */ + if (j == pmincol + && j > 0 + && isnac(ch)) { + SetChar(ch, L(' '), AttrOf(oline->text[j - 1])); + } +#endif + if (!CharEq(ch, nline->text[n])) { + nline->text[n] = ch; + CHANGED_CELL(nline, n); + } + } + +#if USE_SCROLL_HINTS + if (wide) { + int nind = m + displaced; + if (oline->oldindex < 0 + || nind < sminrow + || nind > smaxrow) { + nind = _NEWINDEX; + } else if (displaced) { + register struct ldat *pline = &curscr->_line[nind]; + for (j = 0; j <= my_len; j++) { + int k = newscr->_maxx - j; + if (pline->text[j] != nline->text[j] + || pline->text[k] != nline->text[k]) { + nind = _NEWINDEX; + break; + } + } + } + + nline->oldindex = nind; + } +#endif /* USE_SCROLL_HINTS */ + oline->firstchar = oline->lastchar = _NOCHANGE; + if_USE_SCROLL_HINTS(oline->oldindex = i); + } + + /* + * Clean up debris from scrolling or resizing the pad, so we do not + * accidentally pick up the index value during the next call to this + * procedure. The only rows that should have an index value are those + * that are displayed during this cycle. + */ +#if USE_SCROLL_HINTS + for (i = pminrow - 1; (i >= 0) && (win->_line[i].oldindex >= 0); i--) + win->_line[i].oldindex = _NEWINDEX; + for (i = pmaxrow + 1; (i <= win->_maxy) + && (win->_line[i].oldindex >= 0); i++) + win->_line[i].oldindex = _NEWINDEX; +#endif + + win->_begx = smincol; + win->_begy = sminrow; + + if (win->_clear) { + win->_clear = FALSE; + newscr->_clear = TRUE; + } + + /* + * Use the pad's current position, if it will be visible. + * If not, don't do anything; it's not an error. + */ + if (win->_leaveok == FALSE + && win->_cury >= pminrow + && win->_curx >= pmincol + && win->_cury <= pmaxrow + && win->_curx <= pmaxcol) { + newscr->_cury = win->_cury - pminrow + win->_begy + win->_yoffset; + newscr->_curx = win->_curx - pmincol + win->_begx; + } + newscr->_leaveok = win->_leaveok; + win->_flags &= ~_HASMOVED; + + /* + * Update our cache of the line-numbers that we displayed from the pad. + * We will use this on subsequent calls to this function to derive + * values to stuff into 'oldindex[]' -- for scrolling optimization. + */ + win->_pad._pad_y = pminrow; + win->_pad._pad_x = pmincol; + win->_pad._pad_top = sminrow; + win->_pad._pad_left = smincol; + win->_pad._pad_bottom = smaxrow; + win->_pad._pad_right = smaxcol; + + returnCode(OK); +} + +NCURSES_EXPORT(int) +pechochar(WINDOW *pad, const chtype ch) +{ + T((T_CALLED("pechochar(%p, %s)"), pad, _tracechtype(ch))); + + if (pad == 0) + returnCode(ERR); + + if (!(pad->_flags & _ISPAD)) + returnCode(wechochar(pad, ch)); + + waddch(pad, ch); + prefresh(pad, pad->_pad._pad_y, + pad->_pad._pad_x, + pad->_pad._pad_top, + pad->_pad._pad_left, + pad->_pad._pad_bottom, + pad->_pad._pad_right); + + returnCode(OK); +} |