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inputbox.c

/*
 *  inputbox.c -- implements the input box
 *
 *  AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *
 *  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"

unsigned char dialog_input_result[MAX_LEN + 1];

/*
 * Display a dialog box for inputing a string
 */
int
dialog_inputbox (const char *title, const char *prompt, int height, int width,
             const char *init)
{
    int i, x, y, box_y, box_x, box_width;
    int input_x = 0, scroll = 0, key = 0, button = -1;
    unsigned char *instr = dialog_input_result;
    WINDOW *dialog;

    /* center dialog box on screen */
    x = (COLS - width) / 2;
    y = (LINES - height) / 2;

#ifdef HAVE_LIBNCURSES
    if (use_shadow)
      draw_shadow (stdscr, y, x, height, width);
#endif
    dialog = newwin (height, width, y, x);
    mouse_setbase (x, y);
    keypad (dialog, TRUE);

    draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
    wattrset (dialog, border_attr);
    wmove (dialog, height - 3, 0);
    waddch (dialog, ACS_LTEE);
    for (i = 0; i < width - 2; i++)
      waddch (dialog, ACS_HLINE);
    wattrset (dialog, dialog_attr);
    waddch (dialog, ACS_RTEE);
    wmove (dialog, height - 2, 1);
    for (i = 0; i < width - 2; i++)
      waddch (dialog, ' ');

    if (title != NULL) {
      wattrset (dialog, title_attr);
      wmove (dialog, 0, (width - strlen (title)) / 2 - 1);
      waddch (dialog, ' ');
      waddstr (dialog, title);
      waddch (dialog, ' ');
    }
    wattrset (dialog, dialog_attr);
    print_autowrap (dialog, prompt, width - 2, 1, 3);

    /* Draw the input field box */
    box_width = width - 6;
    getyx (dialog, y, x);
    box_y = y + 2;
    box_x = (width - box_width) / 2;
    mouse_mkregion (y + 1, box_x - 1, 3, box_width + 2, 'i');
    draw_box (dialog, y + 1, box_x - 1, 3, box_width + 2,
            border_attr, dialog_attr);

    x = width / 2 - 11;
    y = height - 2;
    print_button (dialog, "Cancel", y, x + 14, FALSE);
    print_button (dialog, "  OK  ", y, x, TRUE);

    /* Set up the initial value */
    wmove (dialog, box_y, box_x);
    wattrset (dialog, inputbox_attr);
    if (!init)
      instr[0] = '\0';
    else
      strcpy (instr, init);
    input_x = strlen (instr);
    if (input_x >= box_width) {
      scroll = input_x - box_width + 1;
      input_x = box_width - 1;
      for (i = 0; i < box_width - 1; i++)
          waddch (dialog, instr[scroll + i]);
    } else
      waddstr (dialog, instr);
    wmove (dialog, box_y, box_x + input_x);

    wrefresh (dialog);
    while (key != ESC) {
      key = mouse_wgetch (dialog);

      if (button == -1) {     /* Input box selected */
          switch (key) {
          case TAB:
          case KEY_UP:
          case KEY_DOWN:
          case M_EVENT + 'i':
          case M_EVENT + 'o':
          case M_EVENT + 'c':
            break;
          case KEY_LEFT:
            continue;
          case KEY_RIGHT:
            continue;
          case KEY_BACKSPACE:
          case 127:
            if (input_x || scroll) {
                wattrset (dialog, inputbox_attr);
                if (!input_x) {
                  scroll = scroll < box_width - 1 ?
                      0 : scroll - (box_width - 1);
                  wmove (dialog, box_y, box_x);
                  for (i = 0; i < box_width; i++)
                      waddch (dialog, instr[scroll + input_x + i] ?
                            instr[scroll + input_x + i] : ' ');
                  input_x = strlen (instr) - scroll;
                } else
                  input_x--;
                instr[scroll + input_x] = '\0';
                wmove (dialog, box_y, input_x + box_x);
                waddch (dialog, ' ');
                wmove (dialog, box_y, input_x + box_x);
                wrefresh (dialog);
            }
            continue;
          default:
            if (key < 0x100 && isprint (key)) {
                if (scroll + input_x < MAX_LEN) {
                  wattrset (dialog, inputbox_attr);
                  instr[scroll + input_x] = key;
                  instr[scroll + input_x + 1] = '\0';
                  if (input_x == box_width - 1) {
                      scroll++;
                      wmove (dialog, box_y, box_x);
                      for (i = 0; i < box_width - 1; i++)
                        waddch (dialog, instr[scroll + i]);
                  } else {
                      wmove (dialog, box_y, input_x++ + box_x);
                      waddch (dialog, key);
                  }
                  wrefresh (dialog);
                } else
                  flash ();   /* Alarm user about overflow */
                continue;
            }
          }
      }
      switch (key) {
      case 'O':
      case 'o':
          delwin (dialog);
          return 0;
      case 'C':
      case 'c':
          delwin (dialog);
          return 1;
      case M_EVENT + 'i':     /* mouse enter events */
      case M_EVENT + 'o':     /* use the code for 'UP' */
      case M_EVENT + 'c':
          button = (key == M_EVENT + 'o') - (key == M_EVENT + 'c');
      case KEY_UP:
      case KEY_LEFT:
          switch (button) {
          case -1:
            button = 1; /* Indicates "Cancel" button is selected */
            print_button (dialog, "  OK  ", y, x, FALSE);
            print_button (dialog, "Cancel", y, x + 14, TRUE);
            wrefresh (dialog);
            break;
          case 0:
            button = -1;      /* Indicates input box is selected */
            print_button (dialog, "Cancel", y, x + 14, FALSE);
            print_button (dialog, "  OK  ", y, x, TRUE);
            wmove (dialog, box_y, box_x + input_x);
            wrefresh (dialog);
            break;
          case 1:
            button = 0; /* Indicates "OK" button is selected */
            print_button (dialog, "Cancel", y, x + 14, FALSE);
            print_button (dialog, "  OK  ", y, x, TRUE);
            wrefresh (dialog);
            break;
          }
          break;
      case TAB:
      case KEY_DOWN:
      case KEY_RIGHT:
          switch (button) {
          case -1:
            button = 0; /* Indicates "OK" button is selected */
            print_button (dialog, "Cancel", y, x + 14, FALSE);
            print_button (dialog, "  OK  ", y, x, TRUE);
            wrefresh (dialog);
            break;
          case 0:
            button = 1; /* Indicates "Cancel" button is selected */
            print_button (dialog, "  OK  ", y, x, FALSE);
            print_button (dialog, "Cancel", y, x + 14, TRUE);
            wrefresh (dialog);
            break;
          case 1:
            button = -1;      /* Indicates input box is selected */
            print_button (dialog, "Cancel", y, x + 14, FALSE);
            print_button (dialog, "  OK  ", y, x, TRUE);
            wmove (dialog, box_y, box_x + input_x);
            wrefresh (dialog);
            break;
          }
          break;
      case ' ':
      case '\n':
          delwin (dialog);
          return (button == -1 ? 0 : button);
      case ESC:
          break;
      }
    }

    delwin (dialog);
    return -1;                /* ESC pressed */
}

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