Remove win8/metro_driver

win8/metro_driver/ime/ime_popup_monitor.cc

-// Copyright 2013 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 "win8/metro_driver/ime/ime_popup_monitor.h"
-
-#include <windows.h>
-
-#include "base/logging.h"
-#include "base/message_loop/message_loop.h"
-#include "win8/metro_driver/ime/ime_popup_observer.h"
-
-namespace metro_driver {
-namespace {
-
-ImePopupObserver* g_observer_ = NULL;
-HWINEVENTHOOK g_hook_handle_ = NULL;
-
-void CALLBACK ImeEventCallback(HWINEVENTHOOK win_event_hook_handle,
-                               DWORD event,
-                               HWND window_handle,
-                               LONG object_id,
-                               LONG child_id,
-                               DWORD event_thread,
-                               DWORD event_time) {
-  // This function is registered to SetWinEventHook to be called back on the UI
-  // thread.
-  DCHECK(base::MessageLoopForUI::IsCurrent());
-
-  if (!g_observer_)
-    return;
-  switch (event) {
-    case EVENT_OBJECT_IME_SHOW:
-      g_observer_->OnImePopupChanged(ImePopupObserver::kPopupShown);
-      return;
-    case EVENT_OBJECT_IME_HIDE:
-      g_observer_->OnImePopupChanged(ImePopupObserver::kPopupHidden);
-      return;
-    case EVENT_OBJECT_IME_CHANGE:
-      g_observer_->OnImePopupChanged(ImePopupObserver::kPopupUpdated);
-      return;
-  }
-}
-
-}  // namespace
-
-void AddImePopupObserver(ImePopupObserver* observer) {
-  CHECK(g_observer_ == NULL)
-      << "Currently only one observer is supported at the same time.";
-  g_observer_ = observer;
-
-  // IMEs running under immersive mode are supposed to generate WinEvent
-  // whenever their popup UI such as candidate window is shown, updated, and
-  // hidden to support accessibility applications.
-  // http://msdn.microsoft.com/en-us/library/windows/apps/hh967425.aspx#accessibility
-  // Note that there is another mechanism in TSF, called ITfUIElementSink, to
-  // subscribe when the visibility of an IME's UI element is changed. However,
-  // MS-IME running under immersive mode does not fully support this API.
-  // Thus, WinEvent is more reliable for this purpose.
-  g_hook_handle_ = SetWinEventHook(
-      EVENT_OBJECT_IME_SHOW,
-      EVENT_OBJECT_IME_CHANGE,
-      NULL,
-      ImeEventCallback,
-      GetCurrentProcessId(),  // monitor the metro_driver process only
-      0,   // hook all threads because MS-IME emits WinEvent in a worker thread
-      WINEVENT_OUTOFCONTEXT);  // allows us to receive message in the UI thread
-  LOG_IF(ERROR, !g_hook_handle_) << "SetWinEventHook failed.";
-}
-
-void RemoveImePopupObserver(ImePopupObserver* observer) {
-  if (g_observer_ != observer)
-    return;
-  g_observer_ = NULL;
-  if (!g_hook_handle_)
-    return;
-  const bool unhook_succeeded = !!UnhookWinEvent(g_hook_handle_);
-  LOG_IF(ERROR, !unhook_succeeded) << "UnhookWinEvent failed.";
-  g_hook_handle_ = NULL;
-}
-
-}  // namespace metro_driver