/*
* tis_text is assumed to be large enough to hold the converted string,
* i.e. it must be at least pango_utf8_strlen(text, len)+1 bytes.
*/
static thchar_t *
utf8_to_tis (const char *text, int len, thchar_t *tis_text, int *tis_cnt)
{
thchar_t *tis_p;
const char *text_p;
tis_p = tis_text;
for (text_p = text; text_p < text + len; text_p = g_utf8_next_char (text_p))
*tis_p++ = th_uni2tis (g_utf8_get_char (text_p));
*tis_p++ = '\0';
*tis_cnt = tis_p - tis_text;
return tis_text;
}
bool
ThaiInstance::process_key_event (const KeyEvent& key)
{
if (key.is_key_release()
|| key.code == 0
|| __is_context_intact_key (key.code))
{
return false;
}
if (key.mask & (SCIM_KEY_AllMasks
& ~(SCIM_KEY_ShiftMask | SCIM_KEY_CapsLockMask)) ||
__is_context_lost_key (key.code))
{
_forget_previous_chars ();
return false;
}
KeyEvent thai_key = m_keymap.map_key (key);
ucs4_t thai_uni = thai_key.get_unicode_code ();
if (!th_wcistis (thai_uni))
return false;
thchar_t thai_tis = th_uni2tis (thai_uni);
thcell_t context_cell = _get_previous_cell ();
thinpconv_t conv;
if (th_validate (context_cell, thai_tis, &conv))
{
if (conv.offset < 0)
if (!delete_surrounding_text (conv.offset, -conv.offset))
return false;
_forget_previous_chars ();
_remember_previous_char (thai_tis);
WideString str;
for (int i = 0; conv.conv [i]; i++)
str.push_back (th_tis2uni (conv.conv [i]));
commit_string (str);
}
else
{
beep ();
}
return true;
}
thcell_t
ThaiInstance::_get_previous_cell ()
{
WideString surrounding;
int cursor_index;
thcell_t the_cell;
th_init_cell (&the_cell);
if (get_surrounding_text (surrounding, cursor_index))
{
thchar_t* tis_text = new thchar_t [cursor_index+1];
if (!tis_text)
goto exit_point;
tis_text [cursor_index] = '\0';
int begin_index = cursor_index;
while (begin_index > 0)
{
thchar_t c = th_uni2tis (surrounding [begin_index-1]);
if (c == THCHAR_ERR)
break;
tis_text [--begin_index] = c;
}
if (begin_index < cursor_index)
{
th_prev_cell (tis_text + begin_index, cursor_index - begin_index,
&the_cell, true);
}
delete tis_text;
}
else
{
th_prev_cell (m_char_buff, m_buff_tail, &the_cell, true);
}
exit_point:
return the_cell;
}