Current File : //usr/share/doc/ncurses-devel-5.9/test/edit_field.c
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/*
* $Id: edit_field.c,v 1.17 2011/01/15 18:15:11 tom Exp $
*
* A wrapper for form_driver() which keeps track of the user's editing changes
* for each field, and makes the result available as a null-terminated string
* in field_buffer(field,1).
*
* Thomas Dickey - 2003/4/26.
*/
#include <test.priv.h>
#if USE_LIBFORM
#include <edit_field.h>
static struct {
int code;
int result;
const char *help;
} commands[] = {
{
CTRL('A'), REQ_NEXT_CHOICE, ""
},
{
CTRL('B'), REQ_PREV_WORD, "go to previous word"
},
{
CTRL('C'), REQ_CLR_EOL, "clear to end of line"
},
{
CTRL('D'), REQ_DOWN_FIELD, "move downward to field"
},
{
CTRL('E'), REQ_END_FIELD, "go to end of field"
},
{
CTRL('F'), REQ_NEXT_PAGE, "go to next page"
},
{
CTRL('G'), REQ_DEL_WORD, "delete current word"
},
{
CTRL('H'), REQ_DEL_PREV, "delete previous character"
},
{
CTRL('I'), REQ_INS_CHAR, "insert character"
},
{
CTRL('K'), REQ_CLR_EOF, "clear to end of field"
},
{
CTRL('L'), REQ_LEFT_FIELD, "go to field to left"
},
{
CTRL('M'), REQ_NEW_LINE, "insert/overlay new line"
},
{
CTRL('N'), REQ_NEXT_FIELD, "go to next field"
},
{
CTRL('O'), REQ_INS_LINE, "insert blank line at cursor"
},
{
CTRL('P'), REQ_PREV_FIELD, "go to previous field"
},
{
CTRL('Q'), MY_QUIT, "exit form"
},
{
CTRL('R'), REQ_RIGHT_FIELD, "go to field to right"
},
{
CTRL('S'), REQ_BEG_FIELD, "go to beginning of field"
},
{
CTRL('T'), MY_EDT_MODE, "toggle O_EDIT mode, clear field status",
},
{
CTRL('U'), REQ_UP_FIELD, "move upward to field"
},
{
CTRL('V'), REQ_DEL_CHAR, "delete character"
},
{
CTRL('W'), REQ_NEXT_WORD, "go to next word"
},
{
CTRL('X'), REQ_CLR_FIELD, "clear field"
},
{
CTRL('Y'), REQ_DEL_LINE, "delete line"
},
{
CTRL('Z'), REQ_PREV_CHOICE, ""
},
{
CTRL('['), MY_QUIT, "exit form"
},
{
CTRL(']'), MY_INS_MODE, "toggle REQ_INS_MODE/REQ_OVL_MODE",
},
{
KEY_F(1), MY_HELP, "show this screen",
},
{
KEY_BACKSPACE, REQ_DEL_PREV, "delete previous character"
},
{
KEY_DOWN, REQ_DOWN_CHAR, "move down 1 character"
},
{
KEY_END, REQ_LAST_FIELD, "go to last field"
},
{
KEY_HOME, REQ_FIRST_FIELD, "go to first field"
},
{
KEY_LEFT, REQ_LEFT_CHAR, "move left 1 character"
},
{
KEY_LL, REQ_LAST_FIELD, "go to last field"
},
{
KEY_NEXT, REQ_NEXT_FIELD, "go to next field"
},
{
KEY_NPAGE, REQ_NEXT_PAGE, "go to next page"
},
{
KEY_PPAGE, REQ_PREV_PAGE, "go to previous page"
},
{
KEY_PREVIOUS, REQ_PREV_FIELD, "go to previous field"
},
{
KEY_RIGHT, REQ_RIGHT_CHAR, "move right 1 character"
},
{
KEY_UP, REQ_UP_CHAR, "move up 1 character"
}
};
static WINDOW *old_window;
static void
begin_popup(void)
{
doupdate();
old_window = dupwin(curscr);
}
static void
end_popup(void)
{
touchwin(old_window);
wnoutrefresh(old_window);
doupdate();
delwin(old_window);
}
/*
* Display a temporary window listing the keystroke-commands we recognize.
*/
void
help_edit_field(void)
{
int x0 = 4;
int y0 = 2;
int y1 = 0;
int y2 = 0;
int wide = COLS - ((x0 + 1) * 2);
int high = LINES - ((y0 + 1) * 2);
WINDOW *help = newwin(high, wide, y0, x0);
WINDOW *data = newpad(2 + SIZEOF(commands), wide - 4);
unsigned n;
int ch = ERR;
begin_popup();
keypad(help, TRUE);
keypad(data, TRUE);
waddstr(data, "Defined form edit/traversal keys:\n");
for (n = 0; n < SIZEOF(commands); ++n) {
const char *name;
#ifdef NCURSES_VERSION
if ((name = form_request_name(commands[n].result)) == 0)
#endif
name = commands[n].help;
wprintw(data, "%s -- %s\n",
keyname(commands[n].code),
name != 0 ? name : commands[n].help);
}
waddstr(data, "Arrow keys move within a field as you would expect.");
y2 = getcury(data);
do {
switch (ch) {
case KEY_HOME:
y1 = 0;
break;
case KEY_END:
y1 = y2;
break;
case KEY_PREVIOUS:
case KEY_PPAGE:
if (y1 > 0) {
y1 -= high / 2;
if (y1 < 0)
y1 = 0;
} else {
beep();
}
break;
case KEY_NEXT:
case KEY_NPAGE:
if (y1 < y2) {
y1 += high / 2;
if (y1 >= y2)
y1 = y2;
} else {
beep();
}
break;
case CTRL('P'):
case KEY_UP:
if (y1 > 0)
--y1;
else
beep();
break;
case CTRL('N'):
case KEY_DOWN:
if (y1 < y2)
++y1;
else
beep();
break;
default:
beep();
break;
case ERR:
break;
}
werase(help);
box(help, 0, 0);
wnoutrefresh(help);
pnoutrefresh(data, y1, 0, y0 + 1, x0 + 1, high, wide);
doupdate();
} while ((ch = wgetch(data)) != ERR && ch != QUIT && ch != ESCAPE);
werase(help);
wrefresh(help);
delwin(help);
delwin(data);
end_popup();
}
static int
offset_in_field(FORM * form)
{
FIELD *field = current_field(form);
int currow, curcol;
form_getyx(form, currow, curcol);
return curcol + currow * field->dcols;
}
static void
inactive_field(FIELD * f)
{
FieldAttrs *ptr = (FieldAttrs *) field_userptr(f);
set_field_back(f, ptr->background);
}
int
edit_field(FORM * form, int *result)
{
int ch = wgetch(form_win(form));
int status;
FIELD *before;
unsigned n;
char lengths[80];
int length;
char *buffer;
int before_row;
int before_col;
int before_off = offset_in_field(form);
form_getyx(form, before_row, before_col);
before = current_field(form);
set_field_back(before, A_NORMAL);
if (ch <= KEY_MAX) {
set_field_back(before, A_REVERSE);
} else if (ch <= MAX_FORM_COMMAND) {
inactive_field(before);
}
*result = ch;
for (n = 0; n < SIZEOF(commands); ++n) {
if (commands[n].code == ch) {
*result = commands[n].result;
break;
}
}
status = form_driver(form, *result);
if (status == E_OK) {
bool modified = TRUE;
length = 0;
if ((buffer = field_buffer(before, 1)) != 0)
length = atoi(buffer);
if (length < before_off)
length = before_off;
switch (*result) {
case REQ_CLR_EOF:
length = before_off;
break;
case REQ_CLR_EOL:
if (before_row + 1 == before->rows)
length = before_off;
break;
case REQ_CLR_FIELD:
length = 0;
break;
case REQ_DEL_CHAR:
if (length > before_off)
--length;
break;
case REQ_DEL_PREV:
if (length > 0) {
if (before_col > 0) {
--length;
} else if (before_row > 0) {
length -= before->cols + before_col;
}
}
break;
case REQ_NEW_LINE:
length += before->cols;
break;
#if 0
/* FIXME: finish these */
case REQ_DEL_LINE: /* delete line */
case REQ_DEL_WORD: /* delete word at cursor */
case REQ_INS_CHAR: /* insert blank char at cursor */
case REQ_INS_LINE: /* insert blank line at cursor */
case REQ_INS_MODE: /* begin insert mode */
case REQ_OVL_MODE: /* begin overlay mode */
#endif
/* ignore all of the motion commands */
case REQ_SCR_BCHAR: /* FALLTHRU */
case REQ_SCR_BHPAGE: /* FALLTHRU */
case REQ_SCR_BLINE: /* FALLTHRU */
case REQ_SCR_BPAGE: /* FALLTHRU */
case REQ_SCR_FCHAR: /* FALLTHRU */
case REQ_SCR_FHPAGE: /* FALLTHRU */
case REQ_SCR_FLINE: /* FALLTHRU */
case REQ_SCR_FPAGE: /* FALLTHRU */
case REQ_SCR_HBHALF: /* FALLTHRU */
case REQ_SCR_HBLINE: /* FALLTHRU */
case REQ_SCR_HFHALF: /* FALLTHRU */
case REQ_SCR_HFLINE: /* FALLTHRU */
case REQ_BEG_FIELD: /* FALLTHRU */
case REQ_BEG_LINE: /* FALLTHRU */
case REQ_DOWN_CHAR: /* FALLTHRU */
case REQ_DOWN_FIELD: /* FALLTHRU */
case REQ_END_FIELD: /* FALLTHRU */
case REQ_END_LINE: /* FALLTHRU */
case REQ_FIRST_FIELD: /* FALLTHRU */
case REQ_FIRST_PAGE: /* FALLTHRU */
case REQ_LAST_FIELD: /* FALLTHRU */
case REQ_LAST_PAGE: /* FALLTHRU */
case REQ_LEFT_CHAR: /* FALLTHRU */
case REQ_LEFT_FIELD: /* FALLTHRU */
case REQ_NEXT_CHAR: /* FALLTHRU */
case REQ_NEXT_CHOICE: /* FALLTHRU */
case REQ_NEXT_FIELD: /* FALLTHRU */
case REQ_NEXT_LINE: /* FALLTHRU */
case REQ_NEXT_PAGE: /* FALLTHRU */
case REQ_NEXT_WORD: /* FALLTHRU */
case REQ_PREV_CHAR: /* FALLTHRU */
case REQ_PREV_CHOICE: /* FALLTHRU */
case REQ_PREV_FIELD: /* FALLTHRU */
case REQ_PREV_LINE: /* FALLTHRU */
case REQ_PREV_PAGE: /* FALLTHRU */
case REQ_PREV_WORD: /* FALLTHRU */
case REQ_RIGHT_CHAR: /* FALLTHRU */
case REQ_RIGHT_FIELD: /* FALLTHRU */
case REQ_SFIRST_FIELD: /* FALLTHRU */
case REQ_SLAST_FIELD: /* FALLTHRU */
case REQ_SNEXT_FIELD: /* FALLTHRU */
case REQ_SPREV_FIELD: /* FALLTHRU */
case REQ_UP_CHAR: /* FALLTHRU */
case REQ_UP_FIELD: /* FALLTHRU */
case REQ_VALIDATION: /* FALLTHRU */
modified = FALSE;
break;
default:
modified = FALSE;
if (ch >= MIN_FORM_COMMAND) {
beep();
} else if (isprint(ch)) {
modified = TRUE;
}
break;
}
/*
* If we do not force a re-validation, then field_buffer 0 will
* be lagging by one character.
*/
if (modified && form_driver(form, REQ_VALIDATION) == E_OK && *result
< MIN_FORM_COMMAND)
++length;
sprintf(lengths, "%d", length);
set_field_buffer(before, 1, lengths);
}
if (current_field(form) != before)
inactive_field(before);
return status;
}
#else
extern void no_edit_field(void);
void
no_edit_field(void)
{
}
#endif
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