freebsd-dev/contrib/dialog/buttons.c

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/*
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* $Id: buttons.c,v 1.94 2012/12/30 20:51:01 tom Exp $
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*
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* buttons.c -- draw buttons, e.g., OK/Cancel
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*
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* Copyright 2000-2011,2012 Thomas E. Dickey
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*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License, version 2.1
* as published by the Free Software Foundation.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to
* Free Software Foundation, Inc.
* 51 Franklin St., Fifth Floor
* Boston, MA 02110, USA.
*/
#include <dialog.h>
#include <dlg_keys.h>
#ifdef NEED_WCHAR_H
#include <wchar.h>
#endif
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#define MIN_BUTTON (-dialog_state.visit_cols)
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static void
center_label(char *buffer, int longest, const char *label)
{
int len = dlg_count_columns(label);
int left = 0, right = 0;
*buffer = 0;
if (len < longest) {
left = (longest - len) / 2;
right = (longest - len - left);
if (left > 0)
sprintf(buffer, "%*s", left, " ");
}
strcat(buffer, label);
if (right > 0)
sprintf(buffer + strlen(buffer), "%*s", right, " ");
}
/*
* Parse a multibyte character out of the string, set it past the parsed
* character.
*/
static int
string_to_char(const char **stringp)
{
int result;
#ifdef USE_WIDE_CURSES
const char *string = *stringp;
size_t have = strlen(string);
size_t check;
size_t len;
wchar_t cmp2[2];
mbstate_t state;
memset(&state, 0, sizeof(state));
len = mbrlen(string, have, &state);
if ((int) len > 0 && len <= have) {
memset(&state, 0, sizeof(state));
memset(cmp2, 0, sizeof(cmp2));
check = mbrtowc(cmp2, string, len, &state);
if ((int) check <= 0)
cmp2[0] = 0;
*stringp += len;
} else {
cmp2[0] = UCH(*string);
*stringp += 1;
}
result = cmp2[0];
#else
const char *string = *stringp;
result = UCH(*string);
*stringp += 1;
#endif
return result;
}
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static size_t
count_labels(const char **labels)
{
size_t result = 0;
if (labels != 0) {
while (*labels++ != 0) {
++result;
}
}
return result;
}
/*
* Check if the latest key should be added to the hotkey list.
*/
static int
was_hotkey(int this_key, int *used_keys, size_t next)
{
int result = FALSE;
if (next != 0) {
size_t n;
for (n = 0; n < next; ++n) {
if (used_keys[n] == this_key) {
result = TRUE;
break;
}
}
}
return result;
}
/*
* Determine the hot-keys for a set of button-labels. Normally these are
* the first uppercase character in each label. However, if more than one
* button has the same first-uppercase, then we will (attempt to) look for
* an alternate.
*
* This allocates data which must be freed by the caller.
*/
static int *
get_hotkeys(const char **labels)
{
int *result = 0;
size_t count = count_labels(labels);
size_t n;
if ((result = dlg_calloc(int, count + 1)) != 0) {
for (n = 0; n < count; ++n) {
const char *label = labels[n];
const int *indx = dlg_index_wchars(label);
int limit = dlg_count_wchars(label);
int i;
for (i = 0; i < limit; ++i) {
int first = indx[i];
int check = UCH(label[first]);
#ifdef USE_WIDE_CURSES
int last = indx[i + 1];
if ((last - first) != 1) {
const char *temp = (label + first);
check = string_to_char(&temp);
}
#endif
if (dlg_isupper(check) && !was_hotkey(check, result, n)) {
result[n] = check;
break;
}
}
}
}
return result;
}
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/*
* Print a button
*/
static void
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print_button(WINDOW *win, char *label, int hotkey, int y, int x, int selected)
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{
int i;
int state = 0;
const int *indx = dlg_index_wchars(label);
int limit = dlg_count_wchars(label);
chtype key_attr = (selected
? button_key_active_attr
: button_key_inactive_attr);
chtype label_attr = (selected
? button_label_active_attr
: button_label_inactive_attr);
(void) wmove(win, y, x);
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(void) wattrset(win, selected
? button_active_attr
: button_inactive_attr);
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(void) waddstr(win, "<");
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(void) wattrset(win, label_attr);
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for (i = 0; i < limit; ++i) {
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int check;
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int first = indx[i];
int last = indx[i + 1];
switch (state) {
case 0:
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check = UCH(label[first]);
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#ifdef USE_WIDE_CURSES
if ((last - first) != 1) {
const char *temp = (label + first);
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check = string_to_char(&temp);
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}
#endif
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if (check == hotkey) {
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(void) wattrset(win, key_attr);
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state = 1;
}
break;
case 1:
wattrset(win, label_attr);
state = 2;
break;
}
waddnstr(win, label + first, last - first);
}
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(void) wattrset(win, selected
? button_active_attr
: button_inactive_attr);
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(void) waddstr(win, ">");
(void) wmove(win, y, x + ((int) strspn(label, " ")) + 1);
}
/*
* Count the buttons in the list.
*/
int
dlg_button_count(const char **labels)
{
int result = 0;
while (*labels++ != 0)
++result;
return result;
}
/*
* Compute the size of the button array in columns. Return the total number of
* columns in *length, and the longest button's columns in *longest
*/
void
dlg_button_sizes(const char **labels,
int vertical,
int *longest,
int *length)
{
int n;
*length = 0;
*longest = 0;
for (n = 0; labels[n] != 0; n++) {
if (vertical) {
*length += 1;
*longest = 1;
} else {
int len = dlg_count_columns(labels[n]);
if (len > *longest)
*longest = len;
*length += len;
}
}
/*
* If we can, make all of the buttons the same size. This is only optional
* for buttons laid out horizontally.
*/
if (*longest < 6 - (*longest & 1))
*longest = 6 - (*longest & 1);
if (!vertical)
*length = *longest * n;
}
/*
* Compute the size of the button array.
*/
int
dlg_button_x_step(const char **labels, int limit, int *gap, int *margin, int *step)
{
int count = dlg_button_count(labels);
int longest;
int length;
int unused;
int used;
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int result;
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*margin = 0;
if (count != 0) {
dlg_button_sizes(labels, FALSE, &longest, &length);
used = (length + (count * 2));
unused = limit - used;
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if ((*gap = unused / (count + 3)) <= 0) {
if ((*gap = unused / (count + 1)) <= 0)
*gap = 1;
*margin = *gap;
} else {
*margin = *gap * 2;
}
*step = *gap + (used + count - 1) / count;
result = (*gap > 0) && (unused >= 0);
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} else {
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result = 0;
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}
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return result;
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}
/*
* Make sure there is enough space for the buttons
*/
void
dlg_button_layout(const char **labels, int *limit)
{
int width = 1;
int gap, margin, step;
if (labels != 0 && dlg_button_count(labels)) {
while (!dlg_button_x_step(labels, width, &gap, &margin, &step))
++width;
width += (4 * MARGIN);
if (width > COLS)
width = COLS;
if (width > *limit)
*limit = width;
}
}
/*
* Print a list of buttons at the given position.
*/
void
dlg_draw_buttons(WINDOW *win,
int y, int x,
const char **labels,
int selected,
int vertical,
int limit)
{
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chtype save = dlg_get_attrs(win);
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int n;
int step = 0;
int length;
int longest;
int final_x;
int final_y;
int gap;
int margin;
size_t need;
char *buffer;
dlg_mouse_setbase(getbegx(win), getbegy(win));
getyx(win, final_y, final_x);
dlg_button_sizes(labels, vertical, &longest, &length);
if (vertical) {
y += 1;
step = 1;
} else {
dlg_button_x_step(labels, limit, &gap, &margin, &step);
x += margin;
}
/*
* Allocate a buffer big enough for any label.
*/
need = (size_t) longest;
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if (need != 0) {
int *hotkeys = get_hotkeys(labels);
assert_ptr(hotkeys, "dlg_draw_buttons");
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for (n = 0; labels[n] != 0; ++n) {
need += strlen(labels[n]) + 1;
}
buffer = dlg_malloc(char, need);
assert_ptr(buffer, "dlg_draw_buttons");
/*
* Draw the labels.
*/
for (n = 0; labels[n] != 0; n++) {
center_label(buffer, longest, labels[n]);
mouse_mkbutton(y, x, dlg_count_columns(buffer), n);
print_button(win, buffer, hotkeys[n], y, x,
(selected == n) || (n == 0 && selected < 0));
if (selected == n)
getyx(win, final_y, final_x);
if (vertical) {
if ((y += step) > limit)
break;
} else {
if ((x += step) > limit)
break;
}
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}
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(void) wmove(win, final_y, final_x);
wrefresh(win);
(void) wattrset(win, save);
free(buffer);
free(hotkeys);
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}
}
/*
* Match a given character against the beginning of the string, ignoring case
* of the given character. The matching string must begin with an uppercase
* character.
*/
int
dlg_match_char(int ch, const char *string)
{
if (string != 0) {
int cmp2 = string_to_char(&string);
#ifdef USE_WIDE_CURSES
wint_t cmp1 = dlg_toupper(ch);
if (cmp2 != 0 && (wchar_t) cmp1 == (wchar_t) dlg_toupper(cmp2)) {
return TRUE;
}
#else
if (ch > 0 && ch < 256) {
if (dlg_toupper(ch) == dlg_toupper(cmp2))
return TRUE;
}
#endif
}
return FALSE;
}
/*
* Find the first uppercase character in the label, which we may use for an
* abbreviation.
*/
int
dlg_button_to_char(const char *label)
{
int cmp = -1;
while (*label != 0) {
cmp = string_to_char(&label);
if (dlg_isupper(cmp)) {
break;
}
}
return cmp;
}
/*
* Given a list of button labels, and a character which may be the abbreviation
* for one, find it, if it exists. An abbreviation will be the first character
* which happens to be capitalized in the label.
*/
int
dlg_char_to_button(int ch, const char **labels)
{
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int result = DLG_EXIT_UNKNOWN;
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if (labels != 0) {
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int *hotkeys = get_hotkeys(labels);
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int j;
ch = (int) dlg_toupper(dlg_last_getc());
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if (hotkeys != 0) {
for (j = 0; labels[j] != 0; ++j) {
if (ch == hotkeys[j]) {
dlg_flush_getc();
result = j;
break;
}
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}
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free(hotkeys);
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}
}
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return result;
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}
static const char *
my_yes_label(void)
{
return (dialog_vars.yes_label != NULL)
? dialog_vars.yes_label
: _("Yes");
}
static const char *
my_no_label(void)
{
return (dialog_vars.no_label != NULL)
? dialog_vars.no_label
: _("No");
}
static const char *
my_ok_label(void)
{
return (dialog_vars.ok_label != NULL)
? dialog_vars.ok_label
: _("OK");
}
static const char *
my_cancel_label(void)
{
return (dialog_vars.cancel_label != NULL)
? dialog_vars.cancel_label
: _("Cancel");
}
static const char *
my_exit_label(void)
{
return (dialog_vars.exit_label != NULL)
? dialog_vars.exit_label
: _("EXIT");
}
static const char *
my_extra_label(void)
{
return (dialog_vars.extra_label != NULL)
? dialog_vars.extra_label
: _("Extra");
}
static const char *
my_help_label(void)
{
return (dialog_vars.help_label != NULL)
? dialog_vars.help_label
: _("Help");
}
/*
* Return a list of button labels.
*/
const char **
dlg_exit_label(void)
{
const char **result;
DIALOG_VARS save;
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if (dialog_vars.extra_button) {
dlg_save_vars(&save);
dialog_vars.nocancel = TRUE;
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result = dlg_ok_labels();
dlg_restore_vars(&save);
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} else {
static const char *labels[3];
int n = 0;
if (!dialog_vars.nook)
labels[n++] = my_exit_label();
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if (dialog_vars.help_button)
labels[n++] = my_help_label();
if (n == 0)
labels[n++] = my_exit_label();
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labels[n] = 0;
result = labels;
}
return result;
}
/*
* Map the given button index for dlg_exit_label() into our exit-code.
*/
int
dlg_exit_buttoncode(int button)
{
int result;
DIALOG_VARS save;
dlg_save_vars(&save);
dialog_vars.nocancel = TRUE;
result = dlg_ok_buttoncode(button);
dlg_restore_vars(&save);
return result;
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}
const char **
dlg_ok_label(void)
{
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static const char *labels[4];
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int n = 0;
labels[n++] = my_ok_label();
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if (dialog_vars.extra_button)
labels[n++] = my_extra_label();
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if (dialog_vars.help_button)
labels[n++] = my_help_label();
labels[n] = 0;
return labels;
}
/*
* Return a list of button labels for the OK/Cancel group.
*/
const char **
dlg_ok_labels(void)
{
static const char *labels[5];
int n = 0;
if (!dialog_vars.nook)
labels[n++] = my_ok_label();
if (dialog_vars.extra_button)
labels[n++] = my_extra_label();
if (!dialog_vars.nocancel)
labels[n++] = my_cancel_label();
if (dialog_vars.help_button)
labels[n++] = my_help_label();
labels[n] = 0;
return labels;
}
/*
* Map the given button index for dlg_ok_labels() into our exit-code
*/
int
dlg_ok_buttoncode(int button)
{
int result = DLG_EXIT_ERROR;
int n = !dialog_vars.nook;
if (!dialog_vars.nook && (button <= 0)) {
result = DLG_EXIT_OK;
} else if (dialog_vars.extra_button && (button == n++)) {
result = DLG_EXIT_EXTRA;
} else if (!dialog_vars.nocancel && (button == n++)) {
result = DLG_EXIT_CANCEL;
} else if (dialog_vars.help_button && (button == n)) {
result = DLG_EXIT_HELP;
}
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dlg_trace_msg("# dlg_ok_buttoncode(%d) = %d\n", button, result);
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return result;
}
/*
* Given that we're using dlg_ok_labels() to list buttons, find the next index
* in the list of buttons. The 'extra' parameter if negative provides a way to
* enumerate extra active areas on the widget.
*/
int
dlg_next_ok_buttonindex(int current, int extra)
{
int result = current + 1;
if (current >= 0
&& dlg_ok_buttoncode(result) < 0)
result = extra;
return result;
}
/*
* Similarly, find the previous button index.
*/
int
dlg_prev_ok_buttonindex(int current, int extra)
{
int result = current - 1;
if (result < extra) {
for (result = 0; dlg_ok_buttoncode(result + 1) >= 0; ++result) {
;
}
}
return result;
}
/*
* Find the button-index for the "OK" or "Cancel" button, according to
* whether --defaultno is given. If --nocancel was given, we always return
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* the index for the first button (usually "OK" unless --nook was used).
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*/
int
dlg_defaultno_button(void)
{
int result = 0;
if (dialog_vars.defaultno && !dialog_vars.nocancel) {
while (dlg_ok_buttoncode(result) != DLG_EXIT_CANCEL)
++result;
}
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dlg_trace_msg("# dlg_defaultno_button() = %d\n", result);
return result;
}
/*
* Find the button-index for a button named with --default-button. If the
* option was not specified, or if the selected button does not exist, return
* the index of the first button (usually "OK" unless --nook was used).
*/
int
dlg_default_button(void)
{
int i, n;
int result = 0;
if (dialog_vars.default_button >= 0) {
for (i = 0; (n = dlg_ok_buttoncode(i)) >= 0; i++) {
if (n == dialog_vars.default_button) {
result = i;
break;
}
}
}
dlg_trace_msg("# dlg_default_button() = %d\n", result);
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return result;
}
/*
* Return a list of buttons for Yes/No labels.
*/
const char **
dlg_yes_labels(void)
{
const char **result;
if (dialog_vars.extra_button) {
result = dlg_ok_labels();
} else {
static const char *labels[4];
int n = 0;
labels[n++] = my_yes_label();
labels[n++] = my_no_label();
if (dialog_vars.help_button)
labels[n++] = my_help_label();
labels[n] = 0;
result = labels;
}
return result;
}
/*
* Map the given button index for dlg_yes_labels() into our exit-code.
*/
int
dlg_yes_buttoncode(int button)
{
int result = DLG_EXIT_ERROR;
if (dialog_vars.extra_button) {
result = dlg_ok_buttoncode(button);
} else if (button == 0) {
result = DLG_EXIT_OK;
} else if (button == 1) {
result = DLG_EXIT_CANCEL;
} else if (button == 2 && dialog_vars.help_button) {
result = DLG_EXIT_HELP;
}
return result;
}
/*
* Return the next index in labels[];
*/
int
dlg_next_button(const char **labels, int button)
{
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if (button < -1)
button = -1;
if (labels[button + 1] != 0) {
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++button;
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} else {
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button = MIN_BUTTON;
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}
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return button;
}
/*
* Return the previous index in labels[];
*/
int
dlg_prev_button(const char **labels, int button)
{
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if (button > MIN_BUTTON) {
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--button;
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} else {
if (button < -1)
button = -1;
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while (labels[button + 1] != 0)
++button;
}
return button;
}