1 /* $OpenBSD: wresize.c,v 1.4 2001/01/22 18:01:49 millert Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998,1999,2000 Free Software Foundation, Inc. * 5 * * 6 * Permission is hereby granted, free of charge, to any person obtaining a * 7 * copy of this software and associated documentation files (the * 8 * "Software"), to deal in the Software without restriction, including * 9 * without limitation the rights to use, copy, modify, merge, publish, * 10 * distribute, distribute with modifications, sublicense, and/or sell * 11 * copies of the Software, and to permit persons to whom the Software is * 12 * furnished to do so, subject to the following conditions: * 13 * * 14 * The above copyright notice and this permission notice shall be included * 15 * in all copies or substantial portions of the Software. * 16 * * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 24 * * 25 * Except as contained in this notice, the name(s) of the above copyright * 26 * holders shall not be used in advertising or otherwise to promote the * 27 * sale, use or other dealings in this Software without prior written * 28 * authorization. * 29 ****************************************************************************/ 30 31 /**************************************************************************** 32 * Author: Thomas E. Dickey <dickey@clark.net> 1996,1997 * 33 ****************************************************************************/ 34 35 #include <curses.priv.h> 36 37 MODULE_ID("$From: wresize.c,v 1.18 2000/12/10 02:43:28 tom Exp $") 38 39 /* 40 * Reallocate a curses WINDOW struct to either shrink or grow to the specified 41 * new lines/columns. If it grows, the new character cells are filled with 42 * blanks. The application is responsible for repainting the blank area. 43 */ 44 45 #define DOALLOC(p,t,n) typeRealloc(t, n, p) 46 #define ld_ALLOC(p,n) DOALLOC(p,struct ldat,n) 47 #define c_ALLOC(p,n) DOALLOC(p,chtype,n) 48 49 NCURSES_EXPORT(int) 50 wresize(WINDOW *win, int ToLines, int ToCols) 51 { 52 register int row; 53 int size_x, size_y; 54 struct ldat *pline; 55 chtype blank; 56 57 #ifdef TRACE 58 T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols)); 59 if (win) { 60 TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)", 61 win->_begy, win->_begx, 62 win->_maxy, win->_maxx, 63 win->_regtop, win->_regbottom)); 64 if (_nc_tracing & TRACE_UPDATE) 65 _tracedump("...before", win); 66 } 67 #endif 68 69 if (!win || --ToLines < 0 || --ToCols < 0) 70 returnCode(ERR); 71 72 size_x = win->_maxx; 73 size_y = win->_maxy; 74 75 if (ToLines == size_y 76 && ToCols == size_x) 77 returnCode(OK); 78 79 if ((win->_flags & _SUBWIN)) { 80 /* 81 * Check if the new limits will fit into the parent window's size. If 82 * not, do not resize. We could adjust the location of the subwindow, 83 * but the application may not like that. 84 */ 85 if (win->_pary + ToLines > win->_parent->_maxy 86 || win->_parx + ToCols > win->_parent->_maxx) { 87 returnCode(ERR); 88 } 89 pline = win->_parent->_line; 90 } else { 91 pline = 0; 92 } 93 94 /* 95 * If the number of lines has changed, adjust the size of the overall 96 * vector: 97 */ 98 if (ToLines != size_y) { 99 if (!(win->_flags & _SUBWIN)) { 100 for (row = ToLines + 1; row <= size_y; row++) 101 free((char *) (win->_line[row].text)); 102 } 103 104 win->_line = ld_ALLOC(win->_line, ToLines + 1); 105 if (win->_line == 0) 106 returnCode(ERR); 107 108 for (row = size_y + 1; row <= ToLines; row++) { 109 win->_line[row].text = 0; 110 win->_line[row].firstchar = 0; 111 win->_line[row].lastchar = ToCols; 112 if ((win->_flags & _SUBWIN)) { 113 win->_line[row].text = 114 &pline[win->_pary + row].text[win->_parx]; 115 } 116 } 117 } 118 119 /* 120 * Adjust the width of the columns: 121 */ 122 blank = _nc_background(win); 123 for (row = 0; row <= ToLines; row++) { 124 chtype *s = win->_line[row].text; 125 int begin = (s == 0) ? 0 : size_x + 1; 126 int end = ToCols; 127 128 if_USE_SCROLL_HINTS(win->_line[row].oldindex = row); 129 130 if (ToCols != size_x || s == 0) { 131 if (!(win->_flags & _SUBWIN)) { 132 win->_line[row].text = s = c_ALLOC(s, ToCols + 1); 133 if (win->_line[row].text == 0) 134 returnCode(ERR); 135 } else if (s == 0) { 136 win->_line[row].text = s = 137 &pline[win->_pary + row].text[win->_parx]; 138 } 139 140 if (end >= begin) { /* growing */ 141 if (win->_line[row].firstchar < begin) 142 win->_line[row].firstchar = begin; 143 win->_line[row].lastchar = ToCols; 144 do { 145 s[end] = blank; 146 } while (--end >= begin); 147 } else { /* shrinking */ 148 win->_line[row].firstchar = 0; 149 win->_line[row].lastchar = ToCols; 150 } 151 } 152 } 153 154 /* 155 * Finally, adjust the parameters showing screen size and cursor 156 * position: 157 */ 158 win->_maxx = ToCols; 159 win->_maxy = ToLines; 160 161 if (win->_regtop > win->_maxy) 162 win->_regtop = win->_maxy; 163 if (win->_regbottom > win->_maxy 164 || win->_regbottom == size_y) 165 win->_regbottom = win->_maxy; 166 167 if (win->_curx > win->_maxx) 168 win->_curx = win->_maxx; 169 if (win->_cury > win->_maxy) 170 win->_cury = win->_maxy; 171 172 #ifdef TRACE 173 TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)", 174 win->_begy, win->_begx, 175 win->_maxy, win->_maxx, 176 win->_regtop, win->_regbottom)); 177 if (_nc_tracing & TRACE_UPDATE) 178 _tracedump("...after:", win); 179 #endif 180 returnCode(OK); 181 } 182