Improvements to the IBus related code:

+ Handle HidePreeditText IBus signal.
+ Use SDL_GetKeyboardFocus instead of SDL_GetFocusWindow.
+ Move the X11 IBus SetFocus calls to the X11_DispatchFocus functions.
+ Simplify the IBus ifdefs when handling X11 KeyEvents.
+ Remove inotify watch when SDL_IBus_Quit is called.

src/core/linux/SDL_ibus.c

@@ -45,7 +45,7 @@ static char *input_ctx_path = NULL;
 static SDL_Rect ibus_cursor_rect = {0};
 static DBusConnection *ibus_conn = NULL;
 static char *ibus_addr_file = NULL;
-int inotify_fd = -1;
+int inotify_fd = -1, inotify_wd = -1;
 
 static Uint32
 IBus_ModState(void)
@@ -166,8 +166,6 @@ IBus_MessageFilter(DBusConnection *conn, DBusMessage *msg, void *user_data)
                 i += sz;
                 cursor += chars;
             }
-        } else {
-            SDL_SendEditingText("", 0, 0);
         }
         
         SDL_IBus_UpdateTextRect(NULL);
@@ -175,6 +173,11 @@ IBus_MessageFilter(DBusConnection *conn, DBusMessage *msg, void *user_data)
         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;
 }
 
@@ -360,7 +363,7 @@ IBus_SetupConnection(SDL_DBusContext *dbus, const char* addr)
         dbus->connection_flush(ibus_conn);
     }
 
-    SDL_IBus_SetFocus(SDL_GetFocusWindow() != NULL);
+    SDL_IBus_SetFocus(SDL_GetKeyboardFocus() != NULL);
     SDL_IBus_UpdateTextRect(NULL);
     
     return result;
@@ -375,7 +378,7 @@ IBus_CheckConnection(SDL_DBusContext *dbus)
         return SDL_TRUE;
     }
     
-    if(inotify_fd != -1){
+    if(inotify_fd > 0 && inotify_wd > 0){
         char buf[1024];
         ssize_t readsize = read(inotify_fd, buf, sizeof(buf));
         if(readsize > 0){
@@ -428,15 +431,17 @@ SDL_IBus_Init(void)
         
         char *addr = IBus_ReadAddressFromFile(addr_file);
         
-        inotify_fd = inotify_init();
+        if(inotify_fd < 0){
-        fcntl(inotify_fd, F_SETFL, O_NONBLOCK);
+            inotify_fd = inotify_init();
+            fcntl(inotify_fd, F_SETFL, O_NONBLOCK);
+        }
         
         char *addr_file_dir = SDL_strrchr(addr_file, '/');
         if(addr_file_dir){
             *addr_file_dir = 0;
         }
         
-        inotify_add_watch(inotify_fd, addr_file, IN_CREATE | IN_MODIFY);
+        inotify_wd = inotify_add_watch(inotify_fd, addr_file, IN_CREATE | IN_MODIFY);
         SDL_free(addr_file);
         
         result = IBus_SetupConnection(dbus, addr);
@@ -466,6 +471,11 @@ SDL_IBus_Quit(void)
         dbus->connection_unref(ibus_conn);
     }
     
+    if(inotify_fd > 0 && inotify_wd > 0){
+        inotify_rm_watch(inotify_fd, inotify_wd);
+        inotify_wd = -1;
+    }
+    
     SDL_memset(&ibus_cursor_rect, 0, sizeof(ibus_cursor_rect));
 }
 
@@ -548,7 +558,7 @@ SDL_IBus_UpdateTextRect(SDL_Rect *rect)
         SDL_memcpy(&ibus_cursor_rect, rect, sizeof(ibus_cursor_rect));
     }
     
-    SDL_Window *focused_win = SDL_GetFocusWindow();
+    SDL_Window *focused_win = SDL_GetKeyboardFocus();
 
     if(!focused_win) return;
     

src/video/x11/SDL_x11events.c

@@ -347,6 +347,9 @@ X11_DispatchFocusIn(SDL_WindowData *data)
         X11_XSetICFocus(data->ic);
     }
 #endif
+#ifdef SDL_USE_IBUS
+    SDL_IBus_SetFocus(SDL_TRUE);
+#endif
 }
 
 static void
@@ -367,6 +370,9 @@ X11_DispatchFocusOut(SDL_WindowData *data)
         X11_XUnsetICFocus(data->ic);
     }
 #endif
+#ifdef SDL_USE_IBUS
+    SDL_IBus_SetFocus(SDL_FALSE);
+#endif
 }
 
 static void
@@ -646,11 +652,6 @@ X11_DispatchEvent(_THIS)
             }
 #ifdef DEBUG_XEVENTS
             printf("window %p: FocusIn!\n", data);
-#endif
-#ifdef SDL_USE_IBUS
-            if(SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE){
-                SDL_IBus_SetFocus(SDL_TRUE);
-            }
 #endif
             if (data->pending_focus == PENDING_FOCUS_OUT &&
                 data->window == SDL_GetKeyboardFocus()) {
@@ -688,11 +689,6 @@ X11_DispatchEvent(_THIS)
             }
 #ifdef DEBUG_XEVENTS
             printf("window %p: FocusOut!\n", data);
-#endif
-#ifdef SDL_USE_IBUS
-            if(SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE){
-                SDL_IBus_SetFocus(SDL_FALSE);
-            }
 #endif
             data->pending_focus = PENDING_FOCUS_OUT;
             data->pending_focus_time = SDL_GetTicks() + PENDING_FOCUS_OUT_TIME;
@@ -725,16 +721,11 @@ X11_DispatchEvent(_THIS)
             KeySym keysym = NoSymbol;
             char text[SDL_TEXTINPUTEVENT_TEXT_SIZE];
             Status status = 0;
-#ifdef SDL_USE_IBUS
+            SDL_bool handled_by_ime = SDL_FALSE;
-            Bool handled = False;
-#endif
 
 #ifdef DEBUG_XEVENTS
             printf("window %p: KeyPress (X11 keycode = 0x%X)\n", data, xevent.xkey.keycode);
 #endif
-#ifndef SDL_USE_IBUS
-            SDL_SendKeyboardKey(SDL_PRESSED, videodata->key_layout[keycode]);
-#endif
 #if 1
             if (videodata->key_layout[keycode] == SDL_SCANCODE_UNKNOWN && keycode) {
                 int min_keycode, max_keycode;
@@ -762,7 +753,7 @@ X11_DispatchEvent(_THIS)
 #endif
 #ifdef SDL_USE_IBUS
             if(SDL_GetEventState(SDL_TEXTINPUT) == SDL_ENABLE){
-                if(!(handled = SDL_IBus_ProcessKeyEvent(keysym, keycode))){
+                if(!(handled_by_ime = SDL_IBus_ProcessKeyEvent(keysym, keycode))){
 #endif
                     if(*text){
                         SDL_SendKeyboardText(text);
@@ -770,11 +761,11 @@ X11_DispatchEvent(_THIS)
 #ifdef SDL_USE_IBUS
                 }
             }
-
+#endif
-            if (!handled) {
+            if (!handled_by_ime) {
                 SDL_SendKeyboardKey(SDL_PRESSED, videodata->key_layout[keycode]);
             }
-#endif
+
         }
         break;
 

src/video/x11/SDL_x11keyboard.c

@@ -332,9 +332,7 @@ X11_QuitKeyboard(_THIS)
 void
 X11_StartTextInput(_THIS)
 {
-#ifdef SDL_USE_IBUS
+
-    SDL_IBus_SetFocus(SDL_GetFocusWindow() != NULL);
-#endif
 }
 
 void