contrib/dialog/yesno.c

   1 /*
   2  *  $Id: yesno.c,v 1.62 2018/06/19 22:57:01 tom Exp $
   3  *
   4  *  yesno.c -- implements the yes/no box
   5  *
   6  *  Copyright 1999-2012,2018    Thomas E. Dickey
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU Lesser General Public License, version 2.1
  10  *  as published by the Free Software Foundation.
  11  *
  12  *  This program is distributed in the hope that it will be useful, but
  13  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this program; if not, write to
  19  *      Free Software Foundation, Inc.
  20  *      51 Franklin St., Fifth Floor
  21  *      Boston, MA 02110, USA.
  22  *
  23  *  An earlier version of this program lists as authors
  24  *      Savio Lam (lam836@cs.cuhk.hk)
  25  */
  26
  27 #include <dialog.h>
  28 #include <dlg_keys.h>
  29
  30 /*
  31  * Display a dialog box with two buttons - Yes and No.
  32  */
  33 int
  34 dialog_yesno(const char *title, const char *cprompt, int height, int width)
  35 {
  36     /* *INDENT-OFF* */
  37     static DLG_KEYS_BINDING binding[] = {
  38         HELPKEY_BINDINGS,
  39         ENTERKEY_BINDINGS,
  40         SCROLLKEY_BINDINGS,
  41         TRAVERSE_BINDINGS,
  42         END_KEYS_BINDING
  43     };
  44     /* *INDENT-ON* */
  45
  46     int x, y;
  47     int key = 0, fkey;
  48     int code;
  49     int button = dlg_default_button();
  50     WINDOW *dialog = 0;
  51     int result = DLG_EXIT_UNKNOWN;
  52     char *prompt;
  53     const char **buttons = dlg_yes_labels();
  54     int min_width = 25;
  55     bool show = TRUE;
  56     int page, last = 0, offset = 0;
  57
  58 #ifdef KEY_RESIZE
  59     int req_high = height;
  60     int req_wide = width;
  61 #endif
  62
  63     DLG_TRACE(("# yesno args:\n"));
  64     DLG_TRACE2S("title", title);
  65     DLG_TRACE2S("message", cprompt);
  66     DLG_TRACE2N("height", height);
  67     DLG_TRACE2N("width", width);
  68
  69 #ifdef KEY_RESIZE
  70   restart:
  71 #endif
  72     prompt = dlg_strclone(cprompt);
  73     dlg_tab_correct_str(prompt);
  74     dlg_button_layout(buttons, &min_width);
  75     dlg_auto_size(title, prompt, &height, &width, 2, min_width);
  76     dlg_print_size(height, width);
  77     dlg_ctl_size(height, width);
  78
  79     x = dlg_box_x_ordinate(width);
  80     y = dlg_box_y_ordinate(height);
  81
  82 #ifdef KEY_RESIZE
  83     if (dialog != 0)
  84         dlg_move_window(dialog, height, width, y, x);
  85     else
  86 #endif
  87     {
  88         dialog = dlg_new_window(height, width, y, x);
  89         dlg_register_window(dialog, "yesno", binding);
  90         dlg_register_buttons(dialog, "yesno", buttons);
  91     }
  92
  93     dlg_draw_box2(dialog, 0, 0, height, width, dialog_attr, border_attr, border2_attr);
  94     dlg_draw_bottom_box2(dialog, border_attr, border2_attr, dialog_attr);
  95     dlg_draw_title(dialog, title);
  96     dlg_draw_helpline(dialog, FALSE);
  97
  98     dlg_attrset(dialog, dialog_attr);
  99
 100     page = height - (1 + 3 * MARGIN);
 101     dlg_draw_buttons(dialog,
 102                      height - 2 * MARGIN, 0,
 103                      buttons, button, FALSE, width);
 104
 105     while (result == DLG_EXIT_UNKNOWN) {
 106         if (show) {
 107             last = dlg_print_scrolled(dialog, prompt, offset,
 108                                       page, width, TRUE);
 109             dlg_trace_win(dialog);
 110             show = FALSE;
 111         }
 112         key = dlg_mouse_wgetch(dialog, &fkey);
 113         if (dlg_result_key(key, fkey, &result))
 114             break;
 115         if ((code = dlg_char_to_button(key, buttons)) >= 0) {
 116             result = dlg_ok_buttoncode(code);
 117             break;
 118         }
 119         /* handle function keys */
 120         if (fkey) {
 121             switch (key) {
 122             case DLGK_FIELD_NEXT:
 123                 button = dlg_next_button(buttons, button);
 124                 if (button < 0)
 125                     button = 0;
 126                 dlg_draw_buttons(dialog,
 127                                  height - 2, 0,
 128                                  buttons, button,
 129                                  FALSE, width);
 130                 break;
 131             case DLGK_FIELD_PREV:
 132                 button = dlg_prev_button(buttons, button);
 133                 if (button < 0)
 134                     button = 0;
 135                 dlg_draw_buttons(dialog,
 136                                  height - 2, 0,
 137                                  buttons, button,
 138                                  FALSE, width);
 139                 break;
 140             case DLGK_ENTER:
 141                 result = dlg_yes_buttoncode(button);
 142                 break;
 143 #ifdef KEY_RESIZE
 144             case KEY_RESIZE:
 145                 dlg_will_resize(dialog);
 146                 dlg_clear();
 147                 free(prompt);
 148                 height = req_high;
 149                 width = req_wide;
 150                 show = TRUE;
 151                 goto restart;
 152 #endif
 153             default:
 154                 if (is_DLGK_MOUSE(key)) {
 155                     result = dlg_yes_buttoncode(key - M_EVENT);
 156                     if (result < 0)
 157                         result = DLG_EXIT_OK;
 158                 } else if (dlg_check_scrolled(key, last, page,
 159                                               &show, &offset) != 0) {
 160                     beep();
 161                 }
 162                 break;
 163             }
 164         } else {
 165             beep();
 166         }
 167     }
 168
 169     dlg_del_window(dialog);
 170     dlg_mouse_free_regions();
 171     free(prompt);
 172     return result;
 173 }