[FYI] All-in-one OnCandidateWindow{Show,Update,Hide}

ui/base/ime/input_method_base.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/ime/input_method_base.h"
 
 #include "base/logging.h"
 #include "ui/base/ime/input_method_delegate.h"
 #include "ui/base/ime/input_method_observer.h"
 #include "ui/base/ime/text_input_client.h"
 
 namespace ui {
 
 InputMethodBase::InputMethodBase()
   : delegate_(NULL),
     text_input_client_(NULL),
-    system_toplevel_window_focused_(false) {
+    system_toplevel_window_focused_(false),
+    is_candidate_popup_open_(false) {
 }
 
 InputMethodBase::~InputMethodBase() {
   FOR_EACH_OBSERVER(InputMethodObserver,
                     observer_list_,
                     OnInputMethodDestroyed(this));
 }
 
 void InputMethodBase::SetDelegate(internal::InputMethodDelegate* delegate) {
   delegate_ = delegate;
@@ skipping 97 matching lines @@
       (type, key_code, flags) : false;
 }
 
 void InputMethodBase::NotifyTextInputStateChanged(
     const TextInputClient* client) {
   FOR_EACH_OBSERVER(InputMethodObserver,
                     observer_list_,
                     OnTextInputStateChanged(client));
 }
 
+void InputMethodBase::NotifyCandidateWindowStateChanged() {
+  bool new_state = IsCandidatePopupOpen();
+  if (!is_candidate_popup_open_ && new_state) {
+    text_input_client_->OnCandidateWindowShow();
+  } else if (is_candidate_popup_open_ && new_state) {
+    text_input_client_->OnCandidateWindowUpdate();
+  } else if (is_candidate_popup_open_ && !new_state) {
+    text_input_client_->OnCandidateWindowHide();
+  }
+  is_candidate_popup_open_ = new_state;
+}
+
 void InputMethodBase::SetFocusedTextInputClientInternal(
     TextInputClient* client) {
   TextInputClient* old = text_input_client_;
   if (old == client)
     return;
   OnWillChangeFocusedClient(old, client);
   text_input_client_ = client;  // NULL allowed.
   OnDidChangeFocusedClient(old, client);
   NotifyTextInputStateChanged(text_input_client_);
 }
 
 }  // namespace ui