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buildroot/buildroot-2016.08.1/support/kconfig/lxdialog/yesno.c 2.88 KB
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  /*
   *  yesno.c -- implements the yes/no box
   *
   *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
   *
   *  This program is free software; you can redistribute it and/or
   *  modify it under the terms of the GNU General Public License
   *  as published by the Free Software Foundation; either version 2
   *  of the License, or (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #include "dialog.h"
  
  /*
   * Display termination buttons
   */
  static void print_buttons(WINDOW * dialog, int height, int width, int selected)
  {
  	int x = width / 2 - 10;
  	int y = height - 2;
  
  	print_button(dialog, gettext(" Yes "), y, x, selected == 0);
  	print_button(dialog, gettext("  No  "), y, x + 13, selected == 1);
  
  	wmove(dialog, y, x + 1 + 13 * selected);
  	wrefresh(dialog);
  }
  
  /*
   * Display a dialog box with two buttons - Yes and No
   */
  int dialog_yesno(const char *title, const char *prompt, int height, int width)
  {
  	int i, x, y, key = 0, button = 0;
  	WINDOW *dialog;
  
  do_resize:
  	if (getmaxy(stdscr) < (height + YESNO_HEIGTH_MIN))
  		return -ERRDISPLAYTOOSMALL;
  	if (getmaxx(stdscr) < (width + YESNO_WIDTH_MIN))
  		return -ERRDISPLAYTOOSMALL;
  
  	/* center dialog box on screen */
  	x = (getmaxx(stdscr) - width) / 2;
  	y = (getmaxy(stdscr) - height) / 2;
  
  	draw_shadow(stdscr, y, x, height, width);
  
  	dialog = newwin(height, width, y, x);
  	keypad(dialog, TRUE);
  
  	draw_box(dialog, 0, 0, height, width,
  		 dlg.dialog.atr, dlg.border.atr);
  	wattrset(dialog, dlg.border.atr);
  	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
  	for (i = 0; i < width - 2; i++)
  		waddch(dialog, ACS_HLINE);
  	wattrset(dialog, dlg.dialog.atr);
  	waddch(dialog, ACS_RTEE);
  
  	print_title(dialog, title, width);
  
  	wattrset(dialog, dlg.dialog.atr);
  	print_autowrap(dialog, prompt, width - 2, 1, 3);
  
  	print_buttons(dialog, height, width, 0);
  
  	while (key != KEY_ESC) {
  		key = wgetch(dialog);
  		switch (key) {
  		case 'Y':
  		case 'y':
  			delwin(dialog);
  			return 0;
  		case 'N':
  		case 'n':
  			delwin(dialog);
  			return 1;
  
  		case TAB:
  		case KEY_LEFT:
  		case KEY_RIGHT:
  			button = ((key == KEY_LEFT ? --button : ++button) < 0) ? 1 : (button > 1 ? 0 : button);
  
  			print_buttons(dialog, height, width, button);
  			wrefresh(dialog);
  			break;
  		case ' ':
  		case '
  ':
  			delwin(dialog);
  			return button;
  		case KEY_ESC:
  			key = on_key_esc(dialog);
  			break;
  		case KEY_RESIZE:
  			delwin(dialog);
  			on_key_resize();
  			goto do_resize;
  		}
  	}
  
  	delwin(dialog);
  	return key;		/* ESC pressed */
  }