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ime: ibus: Retrieve cursor position and selection 

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 03:10:35 +02:00 committed by Sam Lantinga
parent d11702ce29
commit dd7bed9ebc
1 changed files with 163 additions and 52 deletions
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215
src/core/linux/SDL_ibus.c
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@ -22,6 +22,7 @@
#ifdef HAVE_IBUS_IBUS_H
#include "SDL.h"
#include "SDL_hints.h"
#include "SDL_syswm.h"
#include "SDL_ibus.h"
#include "SDL_dbus.h"
@ -66,107 +67,217 @@ IBus_ModState(void)
return ibus_mods;
}
static SDL_bool
IBus_EnterVariant(DBusConnection *conn, DBusMessageIter *iter, SDL_DBusContext *dbus,
DBusMessageIter *inside, const char * struct_id, size_t id_size)
{
DBusMessageIter sub;
if (dbus->message_iter_get_arg_type(iter) != DBUS_TYPE_VARIANT) {
return SDL_FALSE;
}
dbus->message_iter_recurse(iter, &sub);
if (dbus->message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
return SDL_FALSE;
}
dbus->message_iter_recurse(&sub, inside);
if (dbus->message_iter_get_arg_type(inside) != DBUS_TYPE_STRING) {
return SDL_FALSE;
}
dbus->message_iter_get_basic(inside, &struct_id);
if (!struct_id || SDL_strncmp(struct_id, struct_id, id_size) != 0) {
return SDL_FALSE;
}
return SDL_TRUE;
}
static SDL_bool
IBus_GetDecorationPosition(DBusConnection *conn, DBusMessageIter *iter, SDL_DBusContext *dbus,
Uint32 *start_pos, Uint32 *end_pos)
{
DBusMessageIter sub1, sub2, array;
if (!IBus_EnterVariant(conn, iter, dbus, &sub1, "IBusText", sizeof("IBusText"))) {
return SDL_FALSE;
}
dbus->message_iter_next(&sub1);
dbus->message_iter_next(&sub1);
dbus->message_iter_next(&sub1);
if (!IBus_EnterVariant(conn, &sub1, dbus, &sub2, "IBusAttrList", sizeof("IBusAttrList"))) {
return SDL_FALSE;
}
dbus->message_iter_next(&sub2);
dbus->message_iter_next(&sub2);
if (dbus->message_iter_get_arg_type(&sub2) != DBUS_TYPE_ARRAY) {
return SDL_FALSE;
}
dbus->message_iter_recurse(&sub2, &array);
while (dbus->message_iter_get_arg_type(&array) == DBUS_TYPE_VARIANT) {
DBusMessageIter sub;
if (IBus_EnterVariant(conn, &array, dbus, &sub, "IBusAttribute", sizeof("IBusAttribute"))) {
Uint32 type;
dbus->message_iter_next(&sub);
dbus->message_iter_next(&sub);
/* From here on, the structure looks like this: */
/* Uint32 type: 1=underline, 2=foreground, 3=background */
/* Uint32 value: for underline it's 0=NONE, 1=SINGLE, 2=DOUBLE, */
/* 3=LOW, 4=ERROR */
/* for foreground and background it's a color */
/* Uint32 start_index: starting position for the style (utf8-char) */
/* Uint32 end_index: end position for the style (utf8-char) */
dbus->message_iter_get_basic(&sub, &type);
/* We only use the background type to determine the selection */
if (type == 3) {
Uint32 start = -1;
dbus->message_iter_next(&sub);
dbus->message_iter_next(&sub);
if (dbus->message_iter_get_arg_type(&sub) == DBUS_TYPE_UINT32) {
dbus->message_iter_get_basic(&sub, &start);
dbus->message_iter_next(&sub);
if (dbus->message_iter_get_arg_type(&sub) == DBUS_TYPE_UINT32) {
dbus->message_iter_get_basic(&sub, end_pos);
*start_pos = start;
return SDL_TRUE;
}
}
}
}
dbus->message_iter_next(&array);
}
return SDL_FALSE;
}
static const char *
IBus_GetVariantText(DBusConnection *conn, DBusMessageIter *iter, SDL_DBusContext *dbus)
{
/* The text we need is nested weirdly, use dbus-monitor to see the structure better */
const char *text = NULL;
const char *struct_id = NULL;
DBusMessageIter sub1, sub2;
DBusMessageIter sub;
if (dbus->message_iter_get_arg_type(iter) != DBUS_TYPE_VARIANT) {
if (!IBus_EnterVariant(conn, iter, dbus, &sub, "IBusText", sizeof("IBusText"))) {
return NULL;
}
dbus->message_iter_recurse(iter, &sub1);
if (dbus->message_iter_get_arg_type(&sub1) != DBUS_TYPE_STRUCT) {
dbus->message_iter_next(&sub);
dbus->message_iter_next(&sub);
if (dbus->message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) {
return NULL;
}
dbus->message_iter_recurse(&sub1, &sub2);
if (dbus->message_iter_get_arg_type(&sub2) != DBUS_TYPE_STRING) {
return NULL;
}
dbus->message_iter_get_basic(&sub2, &struct_id);
if (!struct_id || SDL_strncmp(struct_id, "IBusText", sizeof("IBusText")) != 0) {
return NULL;
}
dbus->message_iter_next(&sub2);
dbus->message_iter_next(&sub2);
if (dbus->message_iter_get_arg_type(&sub2) != DBUS_TYPE_STRING) {
return NULL;
}
dbus->message_iter_get_basic(&sub2, &text);
dbus->message_iter_get_basic(&sub, &text);
return text;
}
static SDL_bool
IBus_GetVariantCursorPos(DBusConnection *conn, DBusMessageIter *iter, SDL_DBusContext *dbus,
Uint32 *pos)
{
dbus->message_iter_next(iter);
if (dbus->message_iter_get_arg_type(iter) != DBUS_TYPE_UINT32) {
return SDL_FALSE;
}
dbus->message_iter_get_basic(iter, pos);
return SDL_TRUE;
}
static DBusHandlerResult
IBus_MessageHandler(DBusConnection *conn, DBusMessage *msg, void *user_data)
{
SDL_DBusContext *dbus = (SDL_DBusContext *)user_data;
if (dbus->message_is_signal(msg, IBUS_INPUT_INTERFACE, "CommitText")) {
DBusMessageIter iter;
const char *text;
dbus->message_iter_init(msg, &iter);
text = IBus_GetVariantText(conn, &iter, dbus);
if (text && *text) {
char buf[SDL_TEXTINPUTEVENT_TEXT_SIZE];
size_t text_bytes = SDL_strlen(text), i = 0;
while (i < text_bytes) {
size_t sz = SDL_utf8strlcpy(buf, text+i, sizeof(buf));
SDL_SendKeyboardText(buf);
i += sz;
}
}
return DBUS_HANDLER_RESULT_HANDLED;
}
if (dbus->message_is_signal(msg, IBUS_INPUT_INTERFACE, "UpdatePreeditText")) {
DBusMessageIter iter;
const char *text;
dbus->message_iter_init(msg, &iter);
text = IBus_GetVariantText(conn, &iter, dbus);
if (text) {
char buf[SDL_TEXTEDITINGEVENT_TEXT_SIZE];
size_t text_bytes = SDL_strlen(text), i = 0;
size_t cursor = 0;
do {
const size_t sz = SDL_utf8strlcpy(buf, text+i, sizeof(buf));
const size_t chars = SDL_utf8strlen(buf);
SDL_SendEditingText(buf, cursor, chars);
i += sz;
cursor += chars;
} while (i < text_bytes);
if (text) {
if (SDL_GetHintBoolean(SDL_HINT_IME_SUPPORT_EXTENDED_TEXT, SDL_FALSE)) {
Uint32 pos, start_pos, end_pos;
SDL_bool has_pos = SDL_FALSE;
SDL_bool has_dec_pos = SDL_FALSE;
dbus->message_iter_init(msg, &iter);
has_dec_pos = IBus_GetDecorationPosition(conn, &iter, dbus, &start_pos, &end_pos);
if (!has_dec_pos)
{
dbus->message_iter_init(msg, &iter);
has_pos = IBus_GetVariantCursorPos(conn, &iter, dbus, &pos);
}
if(has_dec_pos) {
SDL_SendEditingText(text, start_pos, end_pos - start_pos);
} else if (has_pos) {
SDL_SendEditingText(text, pos, -1);
} else {
SDL_SendEditingText(text, -1, -1);
}
} else {
char buf[SDL_TEXTEDITINGEVENT_TEXT_SIZE];
size_t text_bytes = SDL_strlen(text), i = 0;
size_t cursor = 0;
do {
const size_t sz = SDL_utf8strlcpy(buf, text+i, sizeof(buf));
const size_t chars = SDL_utf8strlen(buf);
SDL_SendEditingText(buf, cursor, chars);
i += sz;
cursor += chars;
} while (i < text_bytes);
}
}
SDL_IBus_UpdateTextRect(NULL);
return DBUS_HANDLER_RESULT_HANDLED;
}
if (dbus->message_is_signal(msg, IBUS_INPUT_INTERFACE, "HidePreeditText")) {
SDL_SendEditingText("", 0, 0);
return DBUS_HANDLER_RESULT_HANDLED;
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}