kconfig/lxdialog/yesno.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  *  yesno.c -- implements the yes/no box
0004  *
0005  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
0006  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
0007  */
0008
0009 #include "dialog.h"
0010
0011 /*
0012  * Display termination buttons
0013  */
0014 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
0015 {
0016     int x = width / 2 - 10;
0017     int y = height - 2;
0018
0019     print_button(dialog, " Yes ", y, x, selected == 0);
0020     print_button(dialog, "  No  ", y, x + 13, selected == 1);
0021
0022     wmove(dialog, y, x + 1 + 13 * selected);
0023     wrefresh(dialog);
0024 }
0025
0026 /*
0027  * Display a dialog box with two buttons - Yes and No
0028  */
0029 int dialog_yesno(const char *title, const char *prompt, int height, int width)
0030 {
0031     int i, x, y, key = 0, button = 0;
0032     WINDOW *dialog;
0033
0034 do_resize:
0035     if (getmaxy(stdscr) < (height + YESNO_HEIGTH_MIN))
0036         return -ERRDISPLAYTOOSMALL;
0037     if (getmaxx(stdscr) < (width + YESNO_WIDTH_MIN))
0038         return -ERRDISPLAYTOOSMALL;
0039
0040     /* center dialog box on screen */
0041     x = (getmaxx(stdscr) - width) / 2;
0042     y = (getmaxy(stdscr) - height) / 2;
0043
0044     draw_shadow(stdscr, y, x, height, width);
0045
0046     dialog = newwin(height, width, y, x);
0047     keypad(dialog, TRUE);
0048
0049     draw_box(dialog, 0, 0, height, width,
0050          dlg.dialog.atr, dlg.border.atr);
0051     wattrset(dialog, dlg.border.atr);
0052     mvwaddch(dialog, height - 3, 0, ACS_LTEE);
0053     for (i = 0; i < width - 2; i++)
0054         waddch(dialog, ACS_HLINE);
0055     wattrset(dialog, dlg.dialog.atr);
0056     waddch(dialog, ACS_RTEE);
0057
0058     print_title(dialog, title, width);
0059
0060     wattrset(dialog, dlg.dialog.atr);
0061     print_autowrap(dialog, prompt, width - 2, 1, 3);
0062
0063     print_buttons(dialog, height, width, 0);
0064
0065     while (key != KEY_ESC) {
0066         key = wgetch(dialog);
0067         switch (key) {
0068         case 'Y':
0069         case 'y':
0070             delwin(dialog);
0071             return 0;
0072         case 'N':
0073         case 'n':
0074             delwin(dialog);
0075             return 1;
0076
0077         case TAB:
0078         case KEY_LEFT:
0079         case KEY_RIGHT:
0080             button = ((key == KEY_LEFT ? --button : ++button) < 0) ? 1 : (button > 1 ? 0 : button);
0081
0082             print_buttons(dialog, height, width, button);
0083             wrefresh(dialog);
0084             break;
0085         case ' ':
0086         case '\n':
0087             delwin(dialog);
0088             return button;
0089         case KEY_ESC:
0090             key = on_key_esc(dialog);
0091             break;
0092         case KEY_RESIZE:
0093             delwin(dialog);
0094             on_key_resize();
0095             goto do_resize;
0096         }
0097     }
0098
0099     delwin(dialog);
0100     return key;     /* ESC pressed */
0101 }