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ime: fcitx: Retrieve cursor position and selection

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Also, if `SDL_HINT_IME_SUPPORT_EXTENDED_TEXT` is enabled, make use of
`SDL_TEXTEDITING_EXT` by sending the full preedit string.
This commit is contained in:
Guldoman 2022-05-05 04:01:05 +02:00 committed by Sam Lantinga
parent dd7bed9ebc
commit e5a3acd6bd
1 changed files with 73 additions and 13 deletions
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86
src/core/linux/SDL_fcitx.c
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@ -85,14 +85,22 @@ GetAppName()
}
static size_t
Fcitx_GetPreeditString(SDL_DBusContext *dbus, DBusMessage *msg, char **ret) {
Fcitx_GetPreeditString(SDL_DBusContext *dbus,
DBusMessage *msg,
char **ret,
Sint32 *start_pos,
Sint32 *end_pos)
{
char *text = NULL, *subtext;
size_t text_bytes = 0;
DBusMessageIter iter, array, sub;
Sint32 p_start_pos = -1;
Sint32 p_end_pos = -1;
dbus->message_iter_init(msg, &iter);
/* Message type is a(si)i, we only need string part */
if (dbus->message_iter_get_arg_type(&iter) == DBUS_TYPE_ARRAY) {
size_t pos = 0;
/* First pass: calculate string length */
dbus->message_iter_recurse(&iter, &array);
while (dbus->message_iter_get_arg_type(&array) == DBUS_TYPE_STRUCT) {
@ -103,7 +111,29 @@ Fcitx_GetPreeditString(SDL_DBusContext *dbus, DBusMessage *msg, char **ret) {
text_bytes += SDL_strlen(subtext);
}
}
dbus->message_iter_next(&sub);
if (dbus->message_iter_get_arg_type(&sub) == DBUS_TYPE_INT32 && p_end_pos == -1) {
/* Type is a bit field defined as follows: */
/* bit 3: Underline, bit 4: HighLight, bit 5: DontCommit, */
/* bit 6: Bold, bit 7: Strike, bit 8: Italic */
Sint32 type;
dbus->message_iter_get_basic(&sub, &type);
/* We only consider highlight */
if (type & (1 << 4)) {
if (p_start_pos == -1) {
p_start_pos = pos;
}
} else if (p_start_pos != -1 && p_end_pos == -1) {
p_end_pos = pos;
}
}
dbus->message_iter_next(&array);
if (subtext && *subtext) {
pos += SDL_utf8strlen(subtext);
}
}
if (p_start_pos != -1 && p_end_pos == -1) {
p_end_pos = pos;
}
if (text_bytes) {
text = SDL_malloc(text_bytes + 1);
@ -129,10 +159,32 @@ Fcitx_GetPreeditString(SDL_DBusContext *dbus, DBusMessage *msg, char **ret) {
text_bytes = 0;
}
}
*ret= text;
*ret = text;
*start_pos = p_start_pos;
*end_pos = p_end_pos;
return text_bytes;
}
static Sint32
Fcitx_GetPreeditCursorByte(SDL_DBusContext *dbus, DBusMessage *msg)
{
Sint32 byte = -1;
DBusMessageIter iter;
dbus->message_iter_init(msg, &iter);
dbus->message_iter_next(&iter);
if (dbus->message_iter_get_arg_type(&iter) != DBUS_TYPE_INT32) {
return -1;
}
dbus->message_iter_get_basic(&iter, &byte);
return byte;
}
static DBusHandlerResult
DBus_MessageFilter(DBusConnection *conn, DBusMessage *msg, void *data)
{
@ -162,20 +214,28 @@ DBus_MessageFilter(DBusConnection *conn, DBusMessage *msg, void *data)
if (dbus->message_is_signal(msg, FCITX_IC_DBUS_INTERFACE, "UpdateFormattedPreedit")) {
char *text = NULL;
size_t text_bytes = Fcitx_GetPreeditString(dbus, msg, &text);
Sint32 start_pos, end_pos;
size_t text_bytes = Fcitx_GetPreeditString(dbus, msg, &text, &start_pos, &end_pos);
if (text_bytes) {
char buf[SDL_TEXTEDITINGEVENT_TEXT_SIZE];
size_t i = 0;
size_t cursor = 0;
if (SDL_GetHintBoolean(SDL_HINT_IME_SUPPORT_EXTENDED_TEXT, SDL_FALSE)) {
if (start_pos == -1) {
Sint32 byte_pos = Fcitx_GetPreeditCursorByte(dbus, msg);
start_pos = byte_pos >= 0 ? SDL_utf8strnlen(text, byte_pos) : -1;
}
SDL_SendEditingText(text, start_pos, end_pos >= 0 ? end_pos - start_pos : -1);
} else {
char buf[SDL_TEXTEDITINGEVENT_TEXT_SIZE];
size_t i = 0;
size_t cursor = 0;
while (i < text_bytes) {
const size_t sz = SDL_utf8strlcpy(buf, text + i, sizeof(buf));
const size_t chars = SDL_utf8strlen(buf);
while (i < text_bytes) {
const size_t sz = SDL_utf8strlcpy(buf, text + i, sizeof(buf));
const size_t chars = SDL_utf8strlen(buf);
SDL_SendEditingText(buf, cursor, chars);
SDL_SendEditingText(buf, cursor, chars);
i += sz;
cursor += chars;
i += sz;
cursor += chars;
}
}
SDL_free(text);
} else {