ncurses/base/wresize.c

   1 /****************************************************************************
   2  * Copyright (c) 1998 Free Software Foundation, Inc.                        *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
   7  * without limitation the rights to use, copy, modify, merge, publish,      *
   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey <dickey@clark.net> 1996,1997                   *
  31  ****************************************************************************/
  32
  33 #include <curses.priv.h>
  34
  35 MODULE_ID("$Id: wresize.c,v 1.12 1999/02/27 18:57:31 tom Exp $")
  36
  37 /*
  38  * Reallocate a curses WINDOW struct to either shrink or grow to the specified
  39  * new lines/columns.  If it grows, the new character cells are filled with
  40  * blanks.  The application is responsible for repainting the blank area.
  41  */
  42
  43 #define DOALLOC(p,t,n)  typeRealloc(t, n, p)
  44 #define ld_ALLOC(p,n)   DOALLOC(p,struct ldat,n)
  45 #define c_ALLOC(p,n)    DOALLOC(p,chtype,n)
  46
  47 int
  48 wresize(WINDOW *win, int ToLines, int ToCols)
  49 {
  50         register int row;
  51         int size_x, size_y;
  52         struct ldat *pline;
  53         chtype blank;
  54
  55 #ifdef TRACE
  56         T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
  57         if (win) {
  58           TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
  59                             win->_begy, win->_begx,
  60                             win->_maxy, win->_maxx,
  61                             win->_regtop, win->_regbottom));
  62           if (_nc_tracing & TRACE_UPDATE)
  63             _tracedump("...before", win);
  64         }
  65 #endif
  66
  67         if (!win || --ToLines < 0 || --ToCols < 0)
  68                 returnCode(ERR);
  69
  70         size_x = win->_maxx;
  71         size_y = win->_maxy;
  72
  73         if (ToLines == size_y
  74          && ToCols  == size_x)
  75                 returnCode(OK);
  76
  77         pline  = (win->_flags & _SUBWIN) ? win->_parent->_line : 0;
  78
  79         /*
  80          * If the number of lines has changed, adjust the size of the overall
  81          * vector:
  82          */
  83         if (ToLines != size_y) {
  84                 if (! (win->_flags & _SUBWIN)) {
  85                         for (row = ToLines+1; row <= size_y; row++)
  86                                 free((char *)(win->_line[row].text));
  87                 }
  88
  89                 win->_line = ld_ALLOC(win->_line, ToLines+1);
  90                 if (win->_line == 0)
  91                         returnCode(ERR);
  92
  93                 for (row = size_y+1; row <= ToLines; row++) {
  94                         win->_line[row].text      = 0;
  95                         win->_line[row].firstchar = 0;
  96                         win->_line[row].lastchar  = ToCols;
  97                         if ((win->_flags & _SUBWIN)) {
  98                                 win->_line[row].text =
  99                                 &pline[win->_begy + row].text[win->_begx];
 100                         }
 101                 }
 102         }
 103
 104         /*
 105          * Adjust the width of the columns:
 106          */
 107         blank = _nc_background(win);
 108         for (row = 0; row <= ToLines; row++) {
 109                 chtype  *s      = win->_line[row].text;
 110                 int     begin   = (s == 0) ? 0 : size_x + 1;
 111                 int     end     = ToCols;
 112
 113                 if_USE_SCROLL_HINTS(win->_line[row].oldindex = row);
 114
 115                 if (ToCols != size_x || s == 0) {
 116                         if (! (win->_flags & _SUBWIN)) {
 117                                 win->_line[row].text = s = c_ALLOC(s, ToCols+1);
 118                                 if (win->_line[row].text == 0)
 119                                         returnCode(ERR);
 120                         } else if (s == 0) {
 121                                 win->_line[row].text = s =
 122                                 &pline[win->_begy + row].text[win->_begx];
 123                         }
 124
 125                         if (end >= begin) {     /* growing */
 126                                 if (win->_line[row].firstchar < begin)
 127                                         win->_line[row].firstchar = begin;
 128                                 win->_line[row].lastchar = ToCols;
 129                                 do {
 130                                         s[end] = blank;
 131                                 } while (--end >= begin);
 132                         } else {                /* shrinking */
 133                                 win->_line[row].firstchar = 0;
 134                                 win->_line[row].lastchar  = ToCols;
 135                         }
 136                 }
 137         }
 138
 139         /*
 140          * Finally, adjust the parameters showing screen size and cursor
 141          * position:
 142          */
 143         win->_maxx = ToCols;
 144         win->_maxy = ToLines;
 145
 146         if (win->_regtop > win->_maxy)
 147                 win->_regtop = win->_maxy;
 148         if (win->_regbottom > win->_maxy
 149          || win->_regbottom == size_y)
 150                 win->_regbottom = win->_maxy;
 151
 152         if (win->_curx > win->_maxx)
 153                 win->_curx = win->_maxx;
 154         if (win->_cury > win->_maxy)
 155                 win->_cury = win->_maxy;
 156
 157 #ifdef TRACE
 158         TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
 159                 win->_begy, win->_begx,
 160                 win->_maxy, win->_maxx,
 161                 win->_regtop, win->_regbottom));
 162         if (_nc_tracing & TRACE_UPDATE)
 163                 _tracedump("...after:", win);
 164 #endif
 165         returnCode(OK);
 166 }