git.ozlabs.org Git - petitboot/blob - ui/ncurses/nc-widgets.c

   1 /*
   2  *  Copyright (C) 2013 IBM Corporation
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; version 2 of the License.
   7  *
   8  *  This program is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *  GNU General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License
  14  *  along with this program; if not, write to the Free Software
  15  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #if defined(HAVE_CONFIG_H)
  19 #include "config.h"
  20 #endif
  21
  22 #include <linux/input.h> /* This must be included before ncurses.h */
  23 #if defined HAVE_NCURSESW_CURSES_H
  24 #  include <ncursesw/curses.h>
  25 #elif defined HAVE_NCURSESW_H
  26 #  include <ncursesw.h>
  27 #elif defined HAVE_NCURSES_CURSES_H
  28 #  include <ncurses/curses.h>
  29 #elif defined HAVE_NCURSES_H
  30 #  include <ncurses.h>
  31 #elif defined HAVE_CURSES_H
  32 #  include <curses.h>
  33 #else
  34 #  error "Curses header file not found."
  35 #endif
  36
  37 #if defined HAVE_NCURSESW_FORM_H
  38 #  include <ncursesw/form.h>
  39 #elif defined HAVE_NCURSES_FORM_H
  40 #  include <ncurses/form.h>
  41 #elif defined HAVE_FORM_H
  42 #  include <form.h>
  43 #else
  44 #  error "Curses form.h not found."
  45 #endif
  46
  47 #include <string.h>
  48 #include <ctype.h>
  49
  50 #include <talloc/talloc.h>
  51 #include <types/types.h>
  52 #include <log/log.h>
  53 #include <util/util.h>
  54
  55 #include "nc-cui.h"
  56 #include "nc-widgets.h"
  57
  58 #undef move
  59
  60 #define to_checkbox(w) container_of(w, struct nc_widget_checkbox, widget)
  61 #define to_textbox(w) container_of(w, struct nc_widget_textbox, widget)
  62 #define to_button(w) container_of(w, struct nc_widget_button, widget)
  63 #define to_select(w) container_of(w, struct nc_widget_select, widget)
  64
  65 static const char *checkbox_checked_str = "[*]";
  66 static const char *checkbox_unchecked_str = "[ ]";
  67
  68 static const char *select_selected_str = "(*)";
  69 static const char *select_unselected_str = "( )";
  70
  71 struct nc_widgetset {
  72         WINDOW  *mainwin;
  73         WINDOW  *subwin;
  74         FORM    *form;
  75         FIELD   **fields;
  76         int     n_fields, n_alloc_fields;
  77         void    (*widget_focus)(struct nc_widget *, void *);
  78         void    *widget_focus_arg;
  79         FIELD   *cur_field;
  80
  81         /* custom validators */
  82         FIELDTYPE *ipv4_multi_type;
  83 };
  84
  85 struct nc_widget {
  86         FIELD   *field;
  87         bool    (*process_key)(struct nc_widget *, FORM *, int);
  88         void    (*set_visible)(struct nc_widget *, bool);
  89         void    (*move)(struct nc_widget *, int, int);
  90         void    (*field_focus)(struct nc_widget *, FIELD *);
  91         int     focussed_attr;
  92         int     unfocussed_attr;
  93         int     height;
  94         int     width;
  95         int     focus_y;
  96         int     x;
  97         int     y;
  98 };
  99
 100 struct nc_widget_label {
 101         struct nc_widget        widget;
 102         const char              *text;
 103 };
 104
 105 struct nc_widget_checkbox {
 106         struct nc_widget        widget;
 107         bool                    checked;
 108 };
 109
 110 struct nc_widget_textbox {
 111         struct nc_widgetset     *set;
 112         struct nc_widget        widget;
 113 };
 114
 115 struct nc_widget_select {
 116         struct nc_widget        widget;
 117         struct select_option {
 118                 char            *str;
 119                 int             val;
 120                 FIELD           *field;
 121         } *options;
 122         int                     top, left, size;
 123         int                     n_options, selected_option;
 124         struct nc_widgetset     *set;
 125         void                    (*on_change)(void *, int);
 126         void                    *on_change_arg;
 127 };
 128
 129 struct nc_widget_button {
 130         struct nc_widget        widget;
 131         void                    (*click)(void *arg);
 132         void                    *arg;
 133 };
 134
 135 static void widgetset_add_field(struct nc_widgetset *set, FIELD *field);
 136 static void widgetset_remove_field(struct nc_widgetset *set, FIELD *field);
 137
 138 static bool key_is_select(int key)
 139 {
 140         return key == ' ' || key == '\r' || key == '\n' || key == KEY_ENTER;
 141 }
 142
 143 static bool process_key_nop(struct nc_widget *widget __attribute__((unused)),
 144                 FORM *form __attribute((unused)),
 145                 int key __attribute__((unused)))
 146 {
 147         return false;
 148 }
 149
 150 static void field_set_visible(FIELD *field, bool visible)
 151 {
 152         int opts = field_opts(field) & ~O_VISIBLE;
 153         if (visible)
 154                 opts |= O_VISIBLE;
 155         set_field_opts(field, opts);
 156 }
 157
 158 static void field_move(FIELD *field, int y, int x)
 159 {
 160         move_field(field, y, x);
 161 }
 162
 163 static int label_destructor(void *ptr)
 164 {
 165         struct nc_widget_label *label = ptr;
 166         free_field(label->widget.field);
 167         return 0;
 168 }
 169
 170
 171 struct nc_widget_label *widget_new_label(struct nc_widgetset *set,
 172                 int y, int x, char *str)
 173 {
 174         struct nc_widget_label *label;
 175         FIELD *f;
 176         int len;
 177
 178         len = strlen(str);
 179
 180         label = talloc_zero(set, struct nc_widget_label);
 181         label->widget.height = 1;
 182         label->widget.width = len;
 183         label->widget.x = x;
 184         label->widget.y = y;
 185         label->widget.process_key = process_key_nop;
 186         label->widget.field = f = new_field(1, len, y, x, 0, 0);
 187         label->widget.focussed_attr = A_NORMAL;
 188         label->widget.unfocussed_attr = A_NORMAL;
 189
 190         field_opts_off(f, O_ACTIVE);
 191         set_field_buffer(f, 0, str);
 192         set_field_userptr(f, &label->widget);
 193
 194         widgetset_add_field(set, label->widget.field);
 195         talloc_set_destructor(label, label_destructor);
 196
 197         return label;
 198 }
 199
 200 bool widget_checkbox_get_value(struct nc_widget_checkbox *checkbox)
 201 {
 202         return checkbox->checked;
 203 }
 204
 205 static void checkbox_set_buffer(struct nc_widget_checkbox *checkbox)
 206 {
 207         const char *str;
 208         str = checkbox->checked ? checkbox_checked_str : checkbox_unchecked_str;
 209         set_field_buffer(checkbox->widget.field, 0, str);
 210 }
 211
 212 static bool checkbox_process_key(struct nc_widget *widget,
 213                 FORM *form __attribute__((unused)), int key)
 214 {
 215         struct nc_widget_checkbox *checkbox = to_checkbox(widget);
 216
 217         if (!key_is_select(key))
 218                 return false;
 219
 220         checkbox->checked = !checkbox->checked;
 221         checkbox_set_buffer(checkbox);
 222
 223         return true;
 224 }
 225
 226 static int checkbox_destructor(void *ptr)
 227 {
 228         struct nc_widget_checkbox *checkbox = ptr;
 229         free_field(checkbox->widget.field);
 230         return 0;
 231 }
 232
 233 struct nc_widget_checkbox *widget_new_checkbox(struct nc_widgetset *set,
 234                 int y, int x, bool checked)
 235 {
 236         struct nc_widget_checkbox *checkbox;
 237         FIELD *f;
 238
 239         checkbox = talloc_zero(set, struct nc_widget_checkbox);
 240         checkbox->checked = checked;
 241         checkbox->widget.height = 1;
 242         checkbox->widget.width = strlen(checkbox_checked_str);
 243         checkbox->widget.x = x;
 244         checkbox->widget.y = y;
 245         checkbox->widget.process_key = checkbox_process_key;
 246         checkbox->widget.focussed_attr = A_REVERSE;
 247         checkbox->widget.unfocussed_attr = A_NORMAL;
 248         checkbox->widget.field = f = new_field(1, strlen(checkbox_checked_str),
 249                         y, x, 0, 0);
 250
 251         field_opts_off(f, O_EDIT);
 252         set_field_userptr(f, &checkbox->widget);
 253         checkbox_set_buffer(checkbox);
 254
 255         widgetset_add_field(set, checkbox->widget.field);
 256         talloc_set_destructor(checkbox, checkbox_destructor);
 257
 258         return checkbox;
 259 }
 260
 261 static char *strip_string(char *str)
 262 {
 263         int len, i;
 264
 265         len = strlen(str);
 266
 267         /* clear trailing space */
 268         for (i = len - 1; i >= 0; i--) {
 269                 if (!isspace(str[i]))
 270                         break;
 271                 str[i] = '\0';
 272         }
 273
 274         /* increment str past leading space */
 275         for (i = 0; i < len; i++) {
 276                 if (str[i] == '\0' || !isspace(str[i]))
 277                         break;
 278         }
 279
 280         return str + i;
 281 }
 282
 283 char *widget_textbox_get_value(struct nc_widget_textbox *textbox)
 284 {
 285         char *str = field_buffer(textbox->widget.field, 0);
 286         return str ? strip_string(str) : NULL;
 287 }
 288
 289 static bool textbox_process_key(
 290                 struct nc_widget *widget __attribute__((unused)),
 291                 FORM *form, int key)
 292 {
 293         switch (key) {
 294         case KEY_HOME:
 295                 form_driver(form, REQ_BEG_FIELD);
 296                 break;
 297         case KEY_END:
 298                 form_driver(form, REQ_END_FIELD);
 299                 break;
 300         case KEY_LEFT:
 301                 form_driver(form, REQ_LEFT_CHAR);
 302                 break;
 303         case KEY_RIGHT:
 304                 form_driver(form, REQ_RIGHT_CHAR);
 305                 break;
 306         case KEY_BACKSPACE:
 307                 if (form_driver(form, REQ_LEFT_CHAR) != E_OK)
 308                         break;
 309                 /* fall through */
 310         case KEY_DC:
 311                 form_driver(form, REQ_DEL_CHAR);
 312                 break;
 313         default:
 314                 form_driver(form, key);
 315                 break;
 316         }
 317
 318         return true;
 319 }
 320
 321 static int textbox_destructor(void *ptr)
 322 {
 323         struct nc_widget_textbox *textbox = ptr;
 324         free_field(textbox->widget.field);
 325         return 0;
 326 }
 327
 328 struct nc_widget_textbox *widget_new_textbox(struct nc_widgetset *set,
 329                 int y, int x, int len, char *str)
 330 {
 331         struct nc_widget_textbox *textbox;
 332         FIELD *f;
 333
 334         textbox = talloc_zero(set, struct nc_widget_textbox);
 335         textbox->set = set;
 336         textbox->widget.height = 1;
 337         textbox->widget.width = len;
 338         textbox->widget.x = x;
 339         textbox->widget.y = y;
 340         textbox->widget.process_key = textbox_process_key;
 341         textbox->widget.field = f = new_field(1, len, y, x, 0, 0);
 342         textbox->widget.focussed_attr = A_REVERSE;
 343         textbox->widget.unfocussed_attr = A_UNDERLINE;
 344
 345         field_opts_off(f, O_STATIC | O_WRAP | O_BLANK);
 346         set_field_buffer(f, 0, str);
 347         set_field_back(f, textbox->widget.unfocussed_attr);
 348         set_field_userptr(f, &textbox->widget);
 349
 350         widgetset_add_field(set, textbox->widget.field);
 351         talloc_set_destructor(textbox, textbox_destructor);
 352
 353         return textbox;
 354 }
 355
 356 void widget_textbox_set_fixed_size(struct nc_widget_textbox *textbox)
 357 {
 358         field_opts_on(textbox->widget.field, O_STATIC);
 359 }
 360
 361 void widget_textbox_set_validator_integer(struct nc_widget_textbox *textbox,
 362                 long min, long max)
 363 {
 364         set_field_type(textbox->widget.field, TYPE_INTEGER, 1, min, max);
 365 }
 366
 367 void widget_textbox_set_validator_ipv4(struct nc_widget_textbox *textbox)
 368 {
 369         set_field_type(textbox->widget.field, TYPE_IPV4);
 370 }
 371
 372 static bool check_ipv4_multi_char(int c,
 373                 const void *arg __attribute__((unused)))
 374 {
 375         return isdigit(c) || c == '.' || c == ' ';
 376 }
 377
 378 static bool check_ipv4_multi_field(FIELD *field,
 379                 const void *arg __attribute__((unused)))
 380 {
 381         char *buf = field_buffer(field, 0);
 382         unsigned int ip[4];
 383         int n, len;
 384
 385         while (*buf != '\0') {
 386                 n = sscanf(buf, "%u.%u.%u.%u%n",
 387                                 &ip[0], &ip[1], &ip[2], &ip[3], &len);
 388                 if (n != 4)
 389                         return false;
 390
 391                 if (ip[0] > 255 || ip[1] > 255 || ip[2] > 255 || ip[3] > 255)
 392                         return false;
 393
 394                 for (buf += len; *buf != '\0'; buf++) {
 395                         if (isspace(*buf))
 396                                 continue;
 397                         else if (isdigit(*buf))
 398                                 break;
 399                         else
 400                                 return false;
 401                 }
 402         }
 403
 404         return true;
 405 }
 406
 407 void widget_textbox_set_validator_ipv4_multi(struct nc_widget_textbox *textbox)
 408 {
 409         if (!textbox->set->ipv4_multi_type) {
 410                 textbox->set->ipv4_multi_type = new_fieldtype(
 411                                 check_ipv4_multi_field,
 412                                 check_ipv4_multi_char);
 413         }
 414         set_field_type(textbox->widget.field, textbox->set->ipv4_multi_type);
 415 }
 416
 417 static void select_option_change(struct select_option *opt, bool selected)
 418 {
 419         const char *str;
 420
 421         str = selected ? select_selected_str : select_unselected_str;
 422
 423         memcpy(opt->str, str, strlen(str));
 424         set_field_buffer(opt->field, 0, opt->str);
 425 }
 426
 427 static bool select_process_key(struct nc_widget *w, FORM *form, int key)
 428 {
 429         struct nc_widget_select *select = to_select(w);
 430         struct select_option *new_opt, *old_opt;
 431         int i, new_idx;
 432         FIELD *field;
 433
 434         if (!key_is_select(key))
 435                 return false;
 436
 437         field = current_field(form);
 438         new_opt = NULL;
 439
 440         for (i = 0; i < select->n_options; i++) {
 441                 if (select->options[i].field == field) {
 442                         new_opt = &select->options[i];
 443                         new_idx = i;
 444                         break;
 445                 }
 446         }
 447
 448         if (!new_opt)
 449                 return true;
 450
 451         if (new_idx == select->selected_option)
 452                 return true;
 453
 454         old_opt = &select->options[select->selected_option];
 455
 456         select_option_change(old_opt, false);
 457         select_option_change(new_opt, true);
 458
 459         select->selected_option = new_idx;
 460
 461         if (select->on_change)
 462                 select->on_change(select->on_change_arg, new_opt->val);
 463
 464         return true;
 465 }
 466
 467 static void select_set_visible(struct nc_widget *widget, bool visible)
 468 {
 469         struct nc_widget_select *select = to_select(widget);
 470         int i;
 471
 472         for (i = 0; i < select->n_options; i++)
 473                 field_set_visible(select->options[i].field, visible);
 474 }
 475
 476 static void select_move(struct nc_widget *widget, int y, int x)
 477 {
 478         struct nc_widget_select *select = to_select(widget);
 479         int i;
 480
 481         for (i = 0; i < select->n_options; i++)
 482                 field_move(select->options[i].field, y + i, x);
 483 }
 484
 485 static void select_field_focus(struct nc_widget *widget, FIELD *field)
 486 {
 487         struct nc_widget_select *select = to_select(widget);
 488         int i;
 489
 490         for (i = 0; i < select->n_options; i++) {
 491                 if (field != select->options[i].field)
 492                         continue;
 493                 widget->focus_y = i;
 494                 return;
 495         }
 496 }
 497
 498 static int select_destructor(void *ptr)
 499 {
 500         struct nc_widget_select *select = ptr;
 501         int i;
 502
 503         for (i = 0; i < select->n_options; i++)
 504                 free_field(select->options[i].field);
 505
 506         return 0;
 507 }
 508
 509 struct nc_widget_select *widget_new_select(struct nc_widgetset *set,
 510                 int y, int x, int len)
 511 {
 512         struct nc_widget_select *select;
 513
 514         select = talloc_zero(set, struct nc_widget_select);
 515         select->widget.width = len;
 516         select->widget.height = 0;
 517         select->widget.x = x;
 518         select->widget.y = y;
 519         select->widget.process_key = select_process_key;
 520         select->widget.set_visible = select_set_visible;
 521         select->widget.move = select_move;
 522         select->widget.field_focus = select_field_focus;
 523         select->widget.focussed_attr = A_REVERSE;
 524         select->widget.unfocussed_attr = A_NORMAL;
 525         select->top = y;
 526         select->left = x;
 527         select->size = len;
 528         select->set = set;
 529
 530         talloc_set_destructor(select, select_destructor);
 531
 532         return select;
 533 }
 534
 535 void widget_select_add_option(struct nc_widget_select *select, int value,
 536                 const char *text, bool selected)
 537 {
 538         const char *str;
 539         FIELD *f;
 540         int i;
 541
 542         /* if we never see an option with selected set, we want the first
 543          * one to be selected */
 544         if (select->n_options == 0)
 545                 selected = true;
 546         else if (selected)
 547                 select_option_change(&select->options[select->selected_option],
 548                                         false);
 549
 550         if (selected) {
 551                 select->selected_option = select->n_options;
 552                 str = select_selected_str;
 553         } else
 554                 str = select_unselected_str;
 555
 556         i = select->n_options++;
 557         select->widget.height = select->n_options;
 558
 559         select->options = talloc_realloc(select, select->options,
 560                                 struct select_option, i + 2);
 561         select->options[i].val = value;
 562         select->options[i].str = talloc_asprintf(select->options,
 563                                         "%s %s", str, text);
 564
 565         select->options[i].field = f = new_field(1, select->size,
 566                                                 select->top + i,
 567                                                 select->left, 0, 0);
 568
 569         field_opts_off(f, O_WRAP | O_EDIT);
 570         set_field_userptr(f, &select->widget);
 571         set_field_buffer(f, 0, select->options[i].str);
 572
 573         widgetset_add_field(select->set, f);
 574 }
 575
 576 int widget_select_get_value(struct nc_widget_select *select)
 577 {
 578         if (!select->n_options)
 579                 return -1;
 580         return select->options[select->selected_option].val;
 581 }
 582
 583 int widget_select_height(struct nc_widget_select *select)
 584 {
 585         return select->n_options;
 586 }
 587
 588 void widget_select_on_change(struct nc_widget_select *select,
 589                 void (*on_change)(void *, int), void *arg)
 590 {
 591         select->on_change = on_change;
 592         select->on_change_arg = arg;
 593 }
 594
 595 void widget_select_drop_options(struct nc_widget_select *select)
 596 {
 597         struct nc_widgetset *set = select->set;
 598         int i;
 599
 600         for (i = 0; i < select->n_options; i++) {
 601                 FIELD *field = select->options[i].field;
 602                 widgetset_remove_field(set, field);
 603                 if (field == set->cur_field)
 604                         set->cur_field = NULL;
 605                 free_field(select->options[i].field);
 606         }
 607
 608         talloc_free(select->options);
 609         select->options = NULL;
 610         select->n_options = 0;
 611         select->widget.height = 0;
 612         select->widget.focus_y = 0;
 613
 614 }
 615
 616 static bool button_process_key(struct nc_widget *widget,
 617                 FORM *form __attribute__((unused)), int key)
 618 {
 619         struct nc_widget_button *button = to_button(widget);
 620
 621         if (!button->click)
 622                 return false;
 623
 624         if (!key_is_select(key))
 625                 return false;
 626
 627         button->click(button->arg);
 628         return true;
 629 }
 630
 631 static int button_destructor(void *ptr)
 632 {
 633         struct nc_widget_button *button = ptr;
 634         free_field(button->widget.field);
 635         return 0;
 636 }
 637
 638 struct nc_widget_button *widget_new_button(struct nc_widgetset *set,
 639                 int y, int x, int size, const char *str,
 640                 void (*click)(void *), void *arg)
 641 {
 642         struct nc_widget_button *button;
 643         char *text;
 644         FIELD *f;
 645         int idx, len;
 646
 647         button = talloc_zero(set, struct nc_widget_button);
 648         button->widget.height = 1;
 649         button->widget.width = size;
 650         button->widget.x = x;
 651         button->widget.y = y;
 652         button->widget.field = f = new_field(1, size + 2, y, x, 0, 0);
 653         button->widget.process_key = button_process_key;
 654         button->widget.focussed_attr = A_REVERSE;
 655         button->widget.unfocussed_attr = A_NORMAL;
 656         button->click = click;
 657         button->arg = arg;
 658
 659         field_opts_off(f, O_EDIT);
 660         set_field_userptr(f, &button->widget);
 661
 662         /* center str in a size-char buffer, but don't overrun */
 663         len = strlen(str);
 664         len = min(len, size);
 665         idx = (size - len) / 2;
 666
 667         text = talloc_array(button, char, size + 3);
 668         memset(text, ' ', size + 2);
 669         memcpy(text + idx + 1, str, len);
 670         text[0] = '[';
 671         text[size + 1] = ']';
 672         text[size + 2] = '\0';
 673
 674         set_field_buffer(f, 0, text);
 675
 676         widgetset_add_field(set, button->widget.field);
 677         talloc_set_destructor(button, button_destructor);
 678
 679         return button;
 680 }
 681
 682 static void widget_focus_change(struct nc_widget *widget, FIELD *field,
 683                 bool focussed)
 684 {
 685         int attr = focussed ? widget->focussed_attr : widget->unfocussed_attr;
 686         set_field_back(field, attr);
 687 }
 688
 689 bool widgetset_process_key(struct nc_widgetset *set, int key)
 690 {
 691         struct nc_widget *widget;
 692         FIELD *field;
 693         int req = 0;
 694
 695         field = current_field(set->form);
 696         assert(field);
 697
 698         /* handle field change events */
 699         switch (key) {
 700         case KEY_BTAB:
 701         case KEY_UP:
 702                 req = REQ_PREV_FIELD;
 703                 break;
 704         case '\t':
 705         case KEY_DOWN:
 706                 req = REQ_NEXT_FIELD;
 707                 break;
 708         case KEY_PPAGE:
 709                 req = REQ_FIRST_FIELD;
 710                 break;
 711         case KEY_NPAGE:
 712                 req = REQ_LAST_FIELD;
 713                 break;
 714         }
 715
 716         widget = field_userptr(field);
 717         if (req) {
 718                 widget_focus_change(widget, field, false);
 719                 form_driver(set->form, req);
 720                 form_driver(set->form, REQ_END_FIELD);
 721                 field = current_field(set->form);
 722                 widget = field_userptr(field);
 723                 widget_focus_change(widget, field, true);
 724                 if (widget->field_focus)
 725                         widget->field_focus(widget, field);
 726                 if (set->widget_focus)
 727                         set->widget_focus(widget, set->widget_focus_arg);
 728                 return true;
 729         }
 730
 731         if (!widget->process_key)
 732                 return false;
 733
 734         return widget->process_key(widget, set->form, key);
 735 }
 736
 737 static int widgetset_destructor(void *ptr)
 738 {
 739         struct nc_widgetset *set = ptr;
 740         free_form(set->form);
 741         if (set->ipv4_multi_type)
 742                 free_fieldtype(set->ipv4_multi_type);
 743         return 0;
 744 }
 745
 746 struct nc_widgetset *widgetset_create(void *ctx, WINDOW *main, WINDOW *sub)
 747 {
 748         struct nc_widgetset *set;
 749
 750         set = talloc_zero(ctx, struct nc_widgetset);
 751         set->n_alloc_fields = 8;
 752         set->mainwin = main;
 753         set->subwin = sub;
 754         set->fields = talloc_array(set, FIELD *, set->n_alloc_fields);
 755         talloc_set_destructor(set, widgetset_destructor);
 756
 757         return set;
 758 }
 759
 760 void widgetset_set_windows(struct nc_widgetset *set,
 761                 WINDOW *main, WINDOW *sub)
 762 {
 763         set->mainwin = main;
 764         set->subwin = sub;
 765 }
 766
 767 void widgetset_set_widget_focus(struct nc_widgetset *set,
 768                 widget_focus_cb cb, void *arg)
 769 {
 770         set->widget_focus = cb;
 771         set->widget_focus_arg = arg;
 772 }
 773
 774 void widgetset_post(struct nc_widgetset *set)
 775 {
 776         struct nc_widget *widget;
 777         FIELD *field;
 778
 779         set->form = new_form(set->fields);
 780         set_form_win(set->form, set->mainwin);
 781         set_form_sub(set->form, set->subwin);
 782         post_form(set->form);
 783         form_driver(set->form, REQ_END_FIELD);
 784
 785         if (set->cur_field) {
 786                 set_current_field(set->form, set->cur_field);
 787                 field = set->cur_field;
 788         }
 789
 790         field = current_field(set->form);
 791         widget = field_userptr(field);
 792         widget_focus_change(widget, field, true);
 793         if (set->widget_focus)
 794                 set->widget_focus(widget, set->widget_focus_arg);
 795 }
 796
 797 void widgetset_unpost(struct nc_widgetset *set)
 798 {
 799         set->cur_field = current_field(set->form);
 800         unpost_form(set->form);
 801         free_form(set->form);
 802         set->form = NULL;
 803 }
 804
 805 static void widgetset_add_field(struct nc_widgetset *set, FIELD *field)
 806 {
 807         if (set->n_fields == set->n_alloc_fields - 1) {
 808                 set->n_alloc_fields *= 2;
 809                 set->fields = talloc_realloc(set, set->fields,
 810                                 FIELD *, set->n_alloc_fields);
 811         }
 812
 813         set->n_fields++;
 814         set->fields[set->n_fields - 1] = field;
 815         set->fields[set->n_fields] = NULL;
 816 }
 817
 818 static void widgetset_remove_field(struct nc_widgetset *set, FIELD *field)
 819 {
 820         int i;
 821
 822         for (i = 0; i < set->n_fields; i++) {
 823                 if (set->fields[i] == field)
 824                         break;
 825         }
 826
 827         if (i == set->n_fields)
 828                 return;
 829
 830         memmove(&set->fields[i], &set->fields[i+i],
 831                         (set->n_fields - i) * sizeof(set->fields[i]));
 832         set->n_fields--;
 833 }
 834
 835 #define DECLARE_BASEFN(type) \
 836         struct nc_widget *widget_ ## type ## _base              \
 837                 (struct nc_widget_ ## type *w)                  \
 838         { return &w->widget; }
 839
 840 DECLARE_BASEFN(textbox);
 841 DECLARE_BASEFN(checkbox);
 842 DECLARE_BASEFN(select);
 843 DECLARE_BASEFN(label);
 844 DECLARE_BASEFN(button);
 845
 846 void widget_set_visible(struct nc_widget *widget, bool visible)
 847 {
 848         if (widget->set_visible)
 849                 widget->set_visible(widget, visible);
 850         else
 851                 field_set_visible(widget->field, visible);
 852 }
 853
 854 void widget_move(struct nc_widget *widget, int y, int x)
 855 {
 856         if (widget->move)
 857                 widget->move(widget, y, x);
 858         else
 859                 field_move(widget->field, y, x);
 860
 861         widget->x = x;
 862         widget->y = y;
 863 }
 864
 865 int widget_height(struct nc_widget *widget)
 866 {
 867         return widget->height;
 868 }
 869
 870 int widget_width(struct nc_widget *widget)
 871 {
 872         return widget->width;
 873 }
 874
 875 int widget_x(struct nc_widget *widget)
 876 {
 877         return widget->x;
 878 }
 879
 880 int widget_y(struct nc_widget *widget)
 881 {
 882         return widget->y;
 883 }
 884
 885 int widget_focus_y(struct nc_widget *widget)
 886 {
 887         return widget->focus_y;
 888 }
 889