gnu/lib/libdialog/msgbox.c

   1 /*
   2  *  msgbox.c -- implements the message box and info box
   3  *
   4  *  AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version 2
   9  *  of the License, or (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  * $FreeBSD: src/gnu/lib/libdialog/msgbox.c,v 1.17.6.1 2001/08/12 22:48:02 eric Exp $
  21  * $DragonFly: src/gnu/lib/libdialog/msgbox.c,v 1.2 2003/06/17 04:25:43 dillon Exp $
  22  */
  23
  24 #include <dialog.h>
  25 #include "dialog.priv.h"
  26
  27
  28 /* local prototypes */
  29 static int      getnlines(unsigned char *buf);
  30 static void     print_page(WINDOW *win, int height, int width, unsigned char *buf, int startline, int hscroll);
  31 static void     print_perc(WINDOW *win, int y, int x, float p);
  32
  33
  34 /*
  35  * Display a message box. Program will pause and display an "OK" button
  36  * if the parameter 'pause' is non-zero.
  37  */
  38 int dialog_msgbox(unsigned char *title, unsigned char *prompt, int height, int width, int pause)
  39 {
  40   int i, j, x, y, key = 0;
  41   WINDOW *dialog;
  42
  43   if (height < 0)
  44         height = strheight(prompt)+2+2*(!!pause);
  45   if (width < 0) {
  46         i = strwidth(prompt);
  47         j = ((title != NULL) ? strwidth(title) : 0);
  48         width = MAX(i,j)+4;
  49   }
  50   if (pause)
  51         width = MAX(width,10);
  52
  53   if (width > COLS)
  54         width = COLS;
  55   if (height > LINES)
  56         height = LINES;
  57   /* center dialog box on screen */
  58   x = DialogX ? DialogX : (COLS - width)/2;
  59   y = DialogY ? DialogY : (LINES - height)/2;
  60
  61 #ifdef HAVE_NCURSES
  62   if (use_shadow)
  63     draw_shadow(stdscr, y, x, height, width);
  64 #endif
  65   dialog = newwin(height, width, y, x);
  66   if (dialog == NULL) {
  67     endwin();
  68     fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
  69     exit(1);
  70   }
  71   keypad(dialog, TRUE);
  72
  73   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
  74
  75   if (title != NULL) {
  76     wattrset(dialog, title_attr);
  77     wmove(dialog, 0, (width - strlen(title))/2 - 1);
  78     waddch(dialog, ' ');
  79     waddstr(dialog, title);
  80     waddch(dialog, ' ');
  81   }
  82   wattrset(dialog, dialog_attr);
  83   wmove(dialog, 1, 2);
  84   print_autowrap(dialog, prompt, height-1, width-2, width, 1, 2, TRUE, FALSE);
  85
  86   if (pause) {
  87     wattrset(dialog, border_attr);
  88     wmove(dialog, height-3, 0);
  89     waddch(dialog, ACS_LTEE);
  90     for (i = 0; i < width-2; i++)
  91       waddch(dialog, ACS_HLINE);
  92     wattrset(dialog, dialog_attr);
  93     waddch(dialog, ACS_RTEE);
  94     wmove(dialog, height-2, 1);
  95     for (i = 0; i < width-2; i++)
  96     waddch(dialog, ' ');
  97     display_helpline(dialog, height-1, width);
  98     print_button(dialog, "  OK  ", height-2, width/2-6, TRUE);
  99     wrefresh(dialog);
 100     while (key != ESC && key != '\n' && key != ' ' && key != '\r')
 101       key = wgetch(dialog);
 102     if (key == '\r')
 103       key = '\n';
 104   }
 105   else {
 106     key = '\n';
 107     wrefresh(dialog);
 108   }
 109
 110   delwin(dialog);
 111   return (key == ESC ? -1 : 0);
 112 }
 113 /* End of dialog_msgbox() */
 114
 115 int
 116 dialog_mesgbox(unsigned char *title, unsigned char *prompt, int height, int width)
 117 /*
 118  * Desc: basically the same as dialog_msgbox, but ... can use PGUP, PGDN and
 119  *       arrowkeys to move around the text and pause is always enabled
 120  */
 121 {
 122     int         i, j, x, y, key=0;
 123     int         theight, startline, hscroll, max_lines;
 124     WINDOW      *dialog;
 125
 126     if (height < 0)
 127         height = strheight(prompt)+2+2;
 128     if (width < 0) {
 129         i = strwidth(prompt);
 130         j = ((title != NULL) ? strwidth(title) : 0);
 131         width = MAX(i,j)+4;
 132     }
 133     width = MAX(width,10);
 134
 135     if (width > COLS)
 136         width = COLS;
 137     if (height > LINES)
 138         height = LINES;
 139     /* center dialog box on screen */
 140     x = (COLS - width)/2;
 141     y = (LINES - height)/2;
 142
 143 #ifdef HAVE_NCURSES
 144     if (use_shadow)
 145         draw_shadow(stdscr, y, x, height, width);
 146 #endif
 147     dialog = newwin(height, width, y, x);
 148     if (dialog == NULL) {
 149         endwin();
 150         fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
 151         exit(1);
 152     }
 153     keypad(dialog, TRUE);
 154
 155     draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
 156
 157     if (title != NULL) {
 158         wattrset(dialog, title_attr);
 159         wmove(dialog, 0, (width - strlen(title))/2 - 1);
 160         waddch(dialog, ' ');
 161         waddstr(dialog, title);
 162         waddch(dialog, ' ');
 163     }
 164
 165     wattrset(dialog, border_attr);
 166     wmove(dialog, height-3, 0);
 167     waddch(dialog, ACS_LTEE);
 168     for (i = 0; i < width-2; i++)
 169       waddch(dialog, ACS_HLINE);
 170     wattrset(dialog, dialog_attr);
 171     waddch(dialog, ACS_RTEE);
 172     wmove(dialog, height-2, 1);
 173     for (i = 0; i < width-2; i++)
 174     waddch(dialog, ' ');
 175     display_helpline(dialog, height-1, width);
 176     print_button(dialog, "  OK  ", height-2, width/2-6, TRUE);
 177     wattrset(dialog, dialog_attr);
 178
 179     theight = height - 4;
 180     startline = 0;
 181     hscroll = 0;
 182     max_lines = getnlines(prompt);
 183     print_page(dialog, theight, width, prompt, startline, hscroll);
 184     print_perc(dialog, height-3, width-9, (float) (startline+theight)/max_lines);
 185     wmove(dialog, height-2, width/2-3);
 186     wrefresh(dialog);
 187     while ((key != ESC) && (key != '\n') && (key != '\r') && (key != ' ')) {
 188         key = wgetch(dialog);
 189         switch(key) {
 190         case KEY_HOME:
 191             startline=0;
 192             hscroll=0;
 193             break;
 194         case KEY_END:
 195             startline = max_lines - theight;
 196             if (startline < 0) startline = 0;
 197             break;
 198         case '\020':    /* ^P */
 199         case KEY_UP:
 200             if (startline > 0) startline--;
 201             break;
 202         case '\016':    /* ^N */
 203         case KEY_DOWN:
 204             if (startline < max_lines - theight) startline++;
 205             break;
 206         case KEY_RIGHT:
 207             hscroll+=5;
 208             break;
 209         case KEY_LEFT:
 210             if (hscroll > 0) hscroll-=5;
 211             if (hscroll < 0) hscroll =0;
 212             break;
 213         case KEY_PPAGE:
 214             if (startline - height > 0) {
 215                 startline -= theight;
 216             } else {
 217                 startline = 0;
 218             }
 219             break;
 220         case KEY_NPAGE:
 221             if (startline + theight < max_lines - theight) {
 222                 startline += theight;
 223             } else {
 224                 startline = max_lines - theight;
 225                 if (startline < 0) startline = 0;
 226             }
 227             break;
 228         case KEY_F(1):
 229         case '?':
 230             display_helpfile();
 231             break;
 232         }
 233         print_page(dialog, theight, width, prompt, startline, hscroll);
 234         print_perc(dialog, height-3, width-9, (float) (startline+theight)/max_lines);
 235         wmove(dialog, height-2, width/2-3);
 236         wrefresh(dialog);
 237     }
 238
 239     delwin(dialog);
 240     return (key == ESC ? -1 : 0);
 241
 242 } /* dialog_mesgbox() */
 243
 244 static void
 245 print_perc(WINDOW *win, int y, int x, float p)
 246 /*
 247  * Desc: print p as a percentage at the coordinates (y,x)
 248  */
 249 {
 250     char        ps[10];
 251
 252     if (p>1.0) p=1.0;
 253     sprintf(ps, "(%3d%%)", (int) (p*100));
 254     wmove(win, y, x);
 255     waddstr(win, ps);
 256
 257     return;
 258 } /* print_perc() */
 259
 260 static int
 261 getnlines(unsigned char *buf)
 262 /*
 263  * Desc: count the # of lines in <buf>
 264  */
 265 {
 266     int i = 0;
 267
 268     if (*buf)
 269         i++;
 270     while (*buf) {
 271         if (*buf == '\n' || *buf == '\r')
 272             i++;
 273         buf++;
 274     }
 275     return(i);
 276 } /* getlines() */
 277
 278
 279 unsigned char *
 280 getline(unsigned char *buf, int n)
 281 /*
 282  * Desc: return a pointer to the n'th line in <buf> or NULL if its
 283  *       not there
 284  */
 285 {
 286     int i;
 287
 288     if (n<0) {
 289         return(NULL);
 290     }
 291
 292     i=0;
 293     while (*buf && i<n) {
 294         if (*buf == '\n' || *buf == '\r') {
 295             i++;
 296         }
 297         buf++;
 298     }
 299     if (i<n) {
 300         return(NULL);
 301     } else {
 302         return(buf);
 303     }
 304 } /* getline() */
 305
 306 static void
 307 print_page(WINDOW *win, int height, int width, unsigned char *buf, int startline, int hscroll)
 308 /*
 309  * Desc: Print a page of text in the current window, starting at line <startline>
 310  *       with a <horizontal> scroll of hscroll from buffer <buf>
 311  */
 312 {
 313     int i, j;
 314     unsigned char *b;
 315
 316     b = getline(buf, startline);
 317     for (i=0; i<height; i++) {
 318         /* clear line */
 319         wmove(win, 1+i, 1);
 320         for (j=0; j<width-2; j++) waddnstr(win, " ", 1);
 321         wmove(win, 1+i, 1);
 322         j = 0;
 323         /* scroll to the right */
 324         while (*b && (*b != '\n') && (*b != '\r') && (j<hscroll)) {
 325             b++;
 326             j++;
 327         }
 328         /* print new line */
 329         j = 0;
 330         while (*b && (*b != '\n') && (*b != '\r') && (j<width-2)) {
 331             waddnstr(win, b, 1);
 332             if (*b != '\t') {   /* check for tabs */
 333                 j++;
 334             } else {
 335                 j = ((int) (j+1)/8 + 1) * 8 - 1;
 336             }
 337             b++;
 338         }
 339         while (*b && (*b != '\n') && (*b != '\r')) b++;
 340         if (*b) b++;    /* skip over '\n', if it exists */
 341     }
 342 } /* print_page() */
 343
 344
 345
 346