contrib/dialog/yesno.c

   1 /*
   2  *  $Id: yesno.c,v 1.70 2020/03/27 20:27:41 tom Exp $
   3  *
   4  *  yesno.c -- implements the yes/no box
   5  *
   6  *  Copyright 1999-2019,2020    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, fkey;
  48     int button = dlg_default_button();
  49     WINDOW *dialog = 0;
  50     int result = DLG_EXIT_UNKNOWN;
  51     char *prompt;
  52     const char **buttons = dlg_yes_labels();
  53     int min_width = 25;
  54     bool show = TRUE;
  55     int page, last = 0, offset = 0;
  56
  57 #ifdef KEY_RESIZE
  58     int req_high = height;
  59     int req_wide = width;
  60 #endif
  61
  62     DLG_TRACE(("# yesno args:\n"));
  63     DLG_TRACE2S("title", title);
  64     DLG_TRACE2S("message", cprompt);
  65     DLG_TRACE2N("height", height);
  66     DLG_TRACE2N("width", width);
  67
  68 #ifdef KEY_RESIZE
  69   restart:
  70 #endif
  71     prompt = dlg_strclone(cprompt);
  72     dlg_tab_correct_str(prompt);
  73     dlg_button_layout(buttons, &min_width);
  74     dlg_auto_size(title, prompt, &height, &width, 2, min_width);
  75     dlg_print_size(height, width);
  76     dlg_ctl_size(height, width);
  77
  78     x = dlg_box_x_ordinate(width);
  79     y = dlg_box_y_ordinate(height);
  80
  81     dialog = dlg_new_window(height, width, y, x);
  82     dlg_register_window(dialog, "yesno", binding);
  83     dlg_register_buttons(dialog, "yesno", buttons);
  84
  85     dlg_draw_box2(dialog, 0, 0, height, width, dialog_attr, border_attr, border2_attr);
  86     dlg_draw_bottom_box2(dialog, border_attr, border2_attr, dialog_attr);
  87     dlg_draw_title(dialog, title);
  88     dlg_draw_helpline(dialog, FALSE);
  89
  90     dlg_attrset(dialog, dialog_attr);
  91
  92     page = height - (1 + 3 * MARGIN);
  93     dlg_draw_buttons(dialog,
  94                      height - 2 * MARGIN, 0,
  95                      buttons, button, FALSE, width);
  96
  97     while (result == DLG_EXIT_UNKNOWN) {
  98         int code;
  99
 100         if (show) {
 101             last = dlg_print_scrolled(dialog, prompt, offset,
 102                                       page, width, TRUE);
 103             dlg_trace_win(dialog);
 104             show = FALSE;
 105         }
 106         key = dlg_mouse_wgetch(dialog, &fkey);
 107         if (dlg_result_key(key, fkey, &result)) {
 108             if (!dlg_button_key(result, &button, &key, &fkey))
 109                 break;
 110         }
 111         if ((code = dlg_char_to_button(key, buttons)) >= 0) {
 112             result = dlg_ok_buttoncode(code);
 113             break;
 114         }
 115         /* handle function keys */
 116         if (fkey) {
 117             switch (key) {
 118             case DLGK_FIELD_NEXT:
 119                 button = dlg_next_button(buttons, button);
 120                 if (button < 0)
 121                     button = 0;
 122                 dlg_draw_buttons(dialog,
 123                                  height - 2, 0,
 124                                  buttons, button,
 125                                  FALSE, width);
 126                 break;
 127             case DLGK_FIELD_PREV:
 128                 button = dlg_prev_button(buttons, button);
 129                 if (button < 0)
 130                     button = 0;
 131                 dlg_draw_buttons(dialog,
 132                                  height - 2, 0,
 133                                  buttons, button,
 134                                  FALSE, width);
 135                 break;
 136             case DLGK_ENTER:
 137                 result = dlg_yes_buttoncode(button);
 138                 break;
 139 #ifdef KEY_RESIZE
 140             case KEY_RESIZE:
 141                 dlg_will_resize(dialog);
 142                 height = req_high;
 143                 width = req_wide;
 144                 show = TRUE;
 145                 free(prompt);
 146                 _dlg_resize_cleanup(dialog);
 147                 goto restart;
 148 #endif
 149             default:
 150                 if (is_DLGK_MOUSE(key)) {
 151                     result = dlg_yes_buttoncode(key - M_EVENT);
 152                     if (result < 0)
 153                         result = DLG_EXIT_OK;
 154                 } else if (dlg_check_scrolled(key, last, page,
 155                                               &show, &offset) != 0) {
 156                     beep();
 157                 }
 158                 break;
 159             }
 160         } else if (key > 0) {
 161             beep();
 162         }
 163     }
 164     dlg_add_last_key(-1);
 165
 166     dlg_del_window(dialog);
 167     dlg_mouse_free_regions();
 168     free(prompt);
 169     return result;
 170 }