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29 * $Id: move_field.c,v 1.9 2021/06/12 21:30:34 tom Exp $
31 * Demonstrate move_field().
34 #include <test.priv.h>
38 #include <edit_field.h>
39 #include <popup_msg.h>
41 #ifdef HAVE_NETBSD_FORM_H
42 #define form_field_row(field) (field)->form_row
43 #define form_field_col(field) (field)->form_col
44 #else /* e.g., SVr4, ncurses */
45 #define form_field_row(field) (field)->frow
46 #define form_field_col(field) (field)->fcol
49 #define DO_DEMO CTRL('F') /* actual key for toggling demo-mode */
50 #define MY_DEMO EDIT_FIELD('f') /* internal request-code */
52 static char empty[] = "";
53 static FIELD *all_fields[100];
60 { CTRL('A'), REQ_BEG_FIELD, "go to beginning of field" },
61 { CTRL('D'), REQ_DOWN_FIELD, "move downward to field" },
62 { CTRL('E'), REQ_END_FIELD, "go to end of field" },
63 { CTRL('H'), REQ_DEL_PREV, "delete previous character" },
64 { CTRL('I'), REQ_NEXT_FIELD, "go to next field" },
65 { CTRL('K'), REQ_CLR_EOF, "clear to end of field" },
66 { CTRL('N'), REQ_NEXT_FIELD, "go to next field" },
67 { CTRL('P'), REQ_PREV_FIELD, "go to previous field" },
68 { CTRL('Q'), MY_QUIT, "exit form" },
69 { CTRL('U'), REQ_UP_FIELD, "move upward to field" },
70 { CTRL('W'), REQ_NEXT_WORD, "go to next word" },
71 { CTRL('X'), REQ_CLR_FIELD, "clear field" },
72 { CTRL('['), MY_QUIT, "exit form" },
73 { KEY_F(1), MY_HELP, "show this screen", },
74 { KEY_BACKSPACE, REQ_DEL_PREV, "delete previous character" },
75 { KEY_BTAB, REQ_PREV_FIELD, "go to previous field" },
76 { KEY_DOWN, REQ_DOWN_CHAR, "move down 1 character" },
77 { KEY_END, REQ_LAST_FIELD, "go to last field" },
78 { KEY_HOME, REQ_FIRST_FIELD, "go to first field" },
79 { KEY_LEFT, REQ_LEFT_CHAR, "move left 1 character" },
80 { KEY_NEXT, REQ_NEXT_FIELD, "go to next field" },
81 { KEY_PREVIOUS, REQ_PREV_FIELD, "go to previous field" },
82 { KEY_RIGHT, REQ_RIGHT_CHAR, "move right 1 character" },
83 { KEY_UP, REQ_UP_CHAR, "move up 1 character" },
84 { DO_DEMO, MY_DEMO, "move current field with cursor keys" }
89 my_help_edit_field(void)
93 char **msgs = typeCalloc(char *, 3 + SIZEOF(commands));
95 msgs[used++] = strdup("Defined form edit/traversal keys:");
96 for (n = 0; n < SIZEOF(commands); ++n) {
99 const char *code = keyname(commands[n].code);
101 #ifdef NCURSES_VERSION
102 if ((name = form_request_name(commands[n].result)) == 0)
104 name = commands[n].help;
105 need = 5 + strlen(code) + strlen(name);
106 msg = typeMalloc(char, need);
107 _nc_SPRINTF(msg, _nc_SLIMIT(need) "%s -- %s", code, name);
111 strdup("Arrow keys move within a field as you would expect.");
113 popup_msg2(stdscr, msgs);
114 for (n = 0; msgs[n] != 0; ++n) {
121 make_label(const char *label, int frow, int fcol)
123 FIELD *f = new_field(1, (int) strlen(label), frow, fcol, 0, 0);
126 set_field_buffer(f, 0, label);
127 set_field_opts(f, (int) ((unsigned) field_opts(f) & ~O_ACTIVE));
133 make_field(int frow, int fcol, int rows, int cols)
135 FIELD *f = new_field(rows, cols, frow, fcol, 0, 1);
138 set_field_back(f, A_UNDERLINE);
139 init_edit_field(f, empty);
147 WINDOW *w = form_win(f);
148 WINDOW *s = form_sub(f);
158 my_field_attrs(FIELD *f)
160 return (FieldAttrs *) field_userptr(f);
164 buffer_length(FIELD *f)
166 return my_field_attrs(f)->row_lengths[0];
170 set_buffer_length(FIELD *f, int length)
172 my_field_attrs(f)->row_lengths[0] = length;
176 offset_in_field(FORM *form)
178 FIELD *field = current_field(form);
181 form_getyx(form, currow, curcol);
182 return curcol + currow * (int) field->dcols;
186 inactive_field(FIELD *f)
188 set_field_back(f, my_field_attrs(f)->background);
192 my_edit_field(FORM *form, int *result)
194 int ch = wgetch(form_win(form));
200 int before_off = offset_in_field(form);
202 form_getyx(form, before_row, before_col);
203 before = current_field(form);
204 set_field_back(before, A_NORMAL);
206 set_field_back(before, A_REVERSE);
207 } else if (ch <= MAX_FORM_COMMAND) {
208 inactive_field(before);
212 for (n = 0; n < SIZEOF(commands); ++n) {
213 if (commands[n].code == ch) {
214 *result = commands[n].result;
219 status = form_driver(form, *result);
221 if (status == E_OK) {
222 bool modified = TRUE;
223 int length = buffer_length(before);
225 if (length < before_off)
232 if ((int) (before_row + 1) == (int) (before->rows))
239 if (length > before_off)
244 if (before_col > 0) {
246 } else if (before_row > 0) {
247 length -= (int) before->cols + before_col;
252 length += (int) before->cols;
256 modified = (ch < MIN_FORM_COMMAND
262 * If we do not force a re-validation, then field_buffer 0 will
263 * be lagging by one character.
265 if (modified && form_driver(form, REQ_VALIDATION) == E_OK && *result
269 set_buffer_length(before, length);
272 if (current_field(form) != before)
273 inactive_field(before);
278 copy_fields(FIELD **source, size_t length)
280 FIELD **target = calloc(length + 1, sizeof(FIELD *));
281 memcpy(target, source, length * sizeof(FIELD *));
285 /* display a status message to show what's happening */
287 show_status(FORM *form, FIELD *field)
289 WINDOW *sub = form_sub(form);
292 getyx(stdscr, currow, curcol);
293 mvprintw(LINES - 1, 0,
294 "Field at [%d,%d]. Press %s to quit moving.",
295 getbegy(sub) + form_field_row(field),
296 getbegx(sub) + form_field_col(field),
299 move(currow, curcol);
304 * Move the current label+field in response to cursor-keys (or h,j,k,l) until
305 * a control/F is read.
310 int count = field_count(form);
311 FIELD *my_field = current_field(form);
313 if (count > 0 && my_field != NULL) {
314 size_t needed = (size_t) count;
315 FIELD **old_fields = copy_fields(form_fields(form), needed);
316 FIELD **new_fields = copy_fields(form_fields(form), needed);
318 if (old_fields != NULL && new_fields != NULL) {
322 /* TODO: move the label too, in parallel with the editing field */
324 /* remove the current field from the newer list */
325 for (ch = 0; ch <= count; ++ch) {
327 new_fields[ch - 1] = new_fields[ch];
328 } else if (new_fields[ch] == my_field) {
336 getyx(stdscr, currow, curcol);
338 show_status(form, my_field);
339 while ((ch = wgetch(form_win(form))) != DO_DEMO) {
340 int field_y = form_field_row(my_field);
341 int field_x = form_field_col(my_field);
375 /* alter connected fields temporarily to move the field */
377 set_form_fields(form, new_fields);
380 /* TODO: update screen position on success */
381 move_field(my_field, field_y, field_x);
383 /* restore the form's list of fields */
385 set_form_fields(form, old_fields);
388 show_status(form, my_field);
394 move(currow, curcol);
404 my_form_driver(FORM *form, int c)
408 if (form_driver(form, REQ_VALIDATION) == E_OK)
412 my_help_edit_field();
432 /* describe the form */
433 all_fields[n++] = make_label("Sample Form", 0, 15);
436 all_fields[n++] = make_label(fname, 2, 0);
437 all_fields[n++] = make_field(3, 0, 1, 18);
438 set_field_type(all_fields[n - 1], TYPE_ALPHA, 1);
440 fname = "First Name";
441 all_fields[n++] = make_label(fname, 2, 20);
442 all_fields[n++] = make_field(3, 20, 1, 12);
443 set_field_type(all_fields[n - 1], TYPE_ALPHA, 1);
445 fname = "Middle Name";
446 all_fields[n++] = make_label(fname, 2, 34);
447 all_fields[n++] = make_field(3, 34, 1, 12);
448 set_field_type(all_fields[n - 1], TYPE_ALPHA, 1);
451 all_fields[n++] = make_label(fname, 5, 0);
452 all_fields[n++] = make_field(6, 0, 4, 46);
453 init_edit_field(all_fields[n - 1], empty);
455 all_fields[n] = (FIELD *) 0;
457 if ((form = new_form(all_fields)) != 0) {
463 switch (my_edit_field(form, &c)) {
466 case E_UNKNOWN_COMMAND:
467 finished = my_form_driver(form, c);
479 for (c = 0; all_fields[c] != 0; c++) {
480 free_edit_field(all_fields[c]);
481 free_field(all_fields[c]);
490 setlocale(LC_ALL, "");
496 nonl(); /* lets us read ^M's */
497 intrflush(stdscr, FALSE);
498 keypad(stdscr, TRUE);
502 init_pair(1, COLOR_WHITE, COLOR_BLUE);
503 init_pair(2, COLOR_GREEN, COLOR_BLACK);
504 init_pair(3, COLOR_CYAN, COLOR_BLACK);
505 bkgd((chtype) COLOR_PAIR(1));
512 ExitProgram(EXIT_SUCCESS);
519 printf("This program requires the curses form library\n");
520 ExitProgram(EXIT_FAILURE);