Revert of Remove remote tree host and some related input and metro_driver code

ui/base/ime/remote_input_method_win.cc

Index: ui/base/ime/remote_input_method_win.cc
diff --git a/ui/base/ime/remote_input_method_win.cc b/ui/base/ime/remote_input_method_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..27d242a384b3d7d9a5e9f087366d690903784e84
--- /dev/null
+++ b/ui/base/ime/remote_input_method_win.cc
@@ -0,0 +1,385 @@
+// 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 "ui/base/ime/remote_input_method_win.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "base/command_line.h"
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/win/scoped_handle.h"
+#include "ui/base/ime/input_method.h"
+#include "ui/base/ime/input_method_delegate.h"
+#include "ui/base/ime/input_method_observer.h"
+#include "ui/base/ime/remote_input_method_delegate_win.h"
+#include "ui/base/ime/text_input_client.h"
+#include "ui/base/ime/win/tsf_input_scope.h"
+#include "ui/base/ui_base_switches.h"
+#include "ui/events/event.h"
+#include "ui/events/event_utils.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace ui {
+namespace {
+
+const LANGID kFallbackLangID =
+    MAKELANGID(LANG_NEUTRAL, SUBLANG_UI_CUSTOM_DEFAULT);
+
+InputMethod* g_public_interface_ = NULL;
+RemoteInputMethodPrivateWin* g_private_interface_ = NULL;
+
+void RegisterInstance(InputMethod* public_interface,
+                      RemoteInputMethodPrivateWin* private_interface) {
+  CHECK(g_public_interface_ == NULL)
+      << "Only one instance is supported at the same time";
+  CHECK(g_private_interface_ == NULL)
+      << "Only one instance is supported at the same time";
+  g_public_interface_ = public_interface;
+  g_private_interface_ = private_interface;
+}
+
+RemoteInputMethodPrivateWin* GetPrivate(InputMethod* public_interface) {
+  if (g_public_interface_ != public_interface)
+    return NULL;
+  return g_private_interface_;
+}
+
+void UnregisterInstance(InputMethod* public_interface) {
+  RemoteInputMethodPrivateWin* private_interface = GetPrivate(public_interface);
+  if (g_public_interface_ == public_interface &&
+      g_private_interface_ == private_interface) {
+    g_public_interface_ = NULL;
+    g_private_interface_ = NULL;
+  }
+}
+
+std::string GetLocaleString(LCID Locale_id, LCTYPE locale_type) {
+  wchar_t buffer[16] = {};
+
+  //|chars_written| includes NUL terminator.
+  const int chars_written =
+      GetLocaleInfo(Locale_id, locale_type, buffer, arraysize(buffer));
+  if (chars_written <= 1 || static_cast<int>(arraysize(buffer)) < chars_written)
+    return std::string();
+  std::string result;
+  base::WideToUTF8(buffer, chars_written - 1, &result);
+  return result;
+}
+
+std::vector<int32_t> GetInputScopesAsInt(TextInputType text_input_type,
+                                         TextInputMode text_input_mode) {
+  std::vector<int32_t> result;
+  // An empty vector represents |text_input_type| is TEXT_INPUT_TYPE_NONE.
+  if (text_input_type == TEXT_INPUT_TYPE_NONE)
+    return result;
+
+  const std::vector<InputScope>& input_scopes =
+      tsf_inputscope::GetInputScopes(text_input_type, text_input_mode);
+  result.reserve(input_scopes.size());
+  for (size_t i = 0; i < input_scopes.size(); ++i)
+    result.push_back(static_cast<int32_t>(input_scopes[i]));
+  return result;
+}
+
+std::vector<gfx::Rect> GetCompositionCharacterBounds(
+    const TextInputClient* client) {
+  if (!client)
+    return std::vector<gfx::Rect>();
+
+  std::vector<gfx::Rect> bounds;
+  if (client->HasCompositionText()) {
+    gfx::Range range;
+    if (client->GetCompositionTextRange(&range)) {
+      for (uint32_t i = 0; i < range.length(); ++i) {
+        gfx::Rect rect;
+        if (!client->GetCompositionCharacterBounds(i, &rect))
+          break;
+        bounds.push_back(rect);
+      }
+    }
+  }
+
+  // Use the caret bounds as a fallback if no composition character bounds is
+  // available. One typical use case is PPAPI Flash, which does not support
+  // GetCompositionCharacterBounds at all. crbug.com/133472
+  if (bounds.empty())
+    bounds.push_back(client->GetCaretBounds());
+  return bounds;
+}
+
+class RemoteInputMethodWin : public InputMethod,
+                             public RemoteInputMethodPrivateWin {
+ public:
+  explicit RemoteInputMethodWin(internal::InputMethodDelegate* delegate)
+      : delegate_(delegate),
+        remote_delegate_(NULL),
+        text_input_client_(NULL),
+        is_candidate_popup_open_(false),
+        is_ime_(false),
+        langid_(kFallbackLangID) {
+    RegisterInstance(this, this);
+  }
+
+  ~RemoteInputMethodWin() override {
+    FOR_EACH_OBSERVER(InputMethodObserver,
+                      observer_list_,
+                      OnInputMethodDestroyed(this));
+    UnregisterInstance(this);
+  }
+
+ private:
+  // Overridden from InputMethod:
+  void SetDelegate(internal::InputMethodDelegate* delegate) override {
+    delegate_ = delegate;
+  }
+
+  void OnFocus() override {}
+
+  void OnBlur() override {}
+
+  bool OnUntranslatedIMEMessage(const base::NativeEvent& event,
+                                NativeEventResult* result) override {
+    return false;
+  }
+
+  void SetFocusedTextInputClient(TextInputClient* client) override {
+    std::vector<int32_t> prev_input_scopes;
+    std::swap(input_scopes_, prev_input_scopes);
+    std::vector<gfx::Rect> prev_bounds;
+    std::swap(composition_character_bounds_, prev_bounds);
+    if (client) {
+      input_scopes_ = GetInputScopesAsInt(client->GetTextInputType(),
+                                          client->GetTextInputMode());
+      composition_character_bounds_ = GetCompositionCharacterBounds(client);
+    }
+
+    const bool text_input_client_changed = text_input_client_ != client;
+    text_input_client_ = client;
+    if (text_input_client_changed) {
+      FOR_EACH_OBSERVER(InputMethodObserver,
+                        observer_list_,
+                        OnTextInputStateChanged(client));
+    }
+
+    if (!remote_delegate_ || (prev_input_scopes == input_scopes_ &&
+                              prev_bounds == composition_character_bounds_))
+      return;
+    remote_delegate_->OnTextInputClientUpdated(input_scopes_,
+                                               composition_character_bounds_);
+  }
+
+  void DetachTextInputClient(TextInputClient* client) override {
+    if (text_input_client_ != client)
+      return;
+    SetFocusedTextInputClient(NULL);
+  }
+
+  TextInputClient* GetTextInputClient() const override {
+    return text_input_client_;
+  }
+
+  void DispatchKeyEvent(ui::KeyEvent* event) override {
+    if (event->HasNativeEvent()) {
+      const base::NativeEvent& native_key_event = event->native_event();
+      if (native_key_event.message == WM_CHAR && text_input_client_) {
+        text_input_client_->InsertChar(*event);
+        event->StopPropagation();
+      }
+      return;
+    }
+
+    if (event->is_char()) {
+      if (text_input_client_) {
+        text_input_client_->InsertChar(*event);
+      }
+      event->StopPropagation();
+      return;
+    }
+    if (delegate_)
+      ignore_result(delegate_->DispatchKeyEventPostIME(event));
+  }
+
+  void OnTextInputTypeChanged(const TextInputClient* client) override {
+    if (!text_input_client_ || text_input_client_ != client)
+      return;
+    std::vector<int32_t> prev_input_scopes;
+    std::swap(input_scopes_, prev_input_scopes);
+    input_scopes_ = GetInputScopesAsInt(client->GetTextInputType(),
+                                        client->GetTextInputMode());
+    if (input_scopes_ != prev_input_scopes && remote_delegate_) {
+      remote_delegate_->OnTextInputClientUpdated(
+          input_scopes_, composition_character_bounds_);
+    }
+  }
+
+  void OnCaretBoundsChanged(const TextInputClient* client) override {
+    if (!text_input_client_ || text_input_client_ != client)
+      return;
+    std::vector<gfx::Rect> prev_rects;
+    std::swap(composition_character_bounds_, prev_rects);
+    composition_character_bounds_ = GetCompositionCharacterBounds(client);
+    if (composition_character_bounds_ != prev_rects && remote_delegate_) {
+      remote_delegate_->OnTextInputClientUpdated(
+          input_scopes_, composition_character_bounds_);
+    }
+  }
+
+  void CancelComposition(const TextInputClient* client) override {
+    if (CanSendRemoteNotification(client))
+      remote_delegate_->CancelComposition();
+  }
+
+  void OnInputLocaleChanged() override {}
+
+  std::string GetInputLocale() override {
+    const LCID locale_id = MAKELCID(langid_, SORT_DEFAULT);
+    std::string language =
+        GetLocaleString(locale_id, LOCALE_SISO639LANGNAME);
+    if (SUBLANGID(langid_) == SUBLANG_NEUTRAL || language.empty())
+      return language;
+    const std::string& region =
+        GetLocaleString(locale_id, LOCALE_SISO3166CTRYNAME);
+    if (region.empty())
+      return language;
+    return language.append(1, '-').append(region);
+  }
+
+  TextInputType GetTextInputType() const override {
+    return text_input_client_ ? text_input_client_->GetTextInputType()
+                              : TEXT_INPUT_TYPE_NONE;
+  }
+
+  TextInputMode GetTextInputMode() const override {
+    return text_input_client_ ? text_input_client_->GetTextInputMode()
+                              : TEXT_INPUT_MODE_DEFAULT;
+  }
+
+  int GetTextInputFlags() const override {
+    return text_input_client_ ? text_input_client_->GetTextInputFlags()
+                              : 0;
+  }
+
+  bool CanComposeInline() const override {
+    return text_input_client_ ? text_input_client_->CanComposeInline() : true;
+  }
+
+  bool IsCandidatePopupOpen() const override {
+    return is_candidate_popup_open_;
+  }
+
+  void ShowImeIfNeeded() override {}
+
+  void AddObserver(InputMethodObserver* observer) override {
+    observer_list_.AddObserver(observer);
+  }
+
+  void RemoveObserver(InputMethodObserver* observer) override {
+    observer_list_.RemoveObserver(observer);
+  }
+
+  // Overridden from RemoteInputMethodPrivateWin:
+  void SetRemoteDelegate(
+      internal::RemoteInputMethodDelegateWin* delegate) override {
+    remote_delegate_ = delegate;
+
+    // Sync initial state.
+    if (remote_delegate_) {
+      remote_delegate_->OnTextInputClientUpdated(
+          input_scopes_, composition_character_bounds_);
+    }
+  }
+
+  void OnCandidatePopupChanged(bool visible) override {
+    is_candidate_popup_open_ = visible;
+  }
+
+  void OnInputSourceChanged(LANGID langid, bool /*is_ime*/) override {
+    // Note: Currently |is_ime| is not utilized yet.
+    const bool changed = (langid_ != langid);
+    langid_ = langid;
+    if (changed && GetTextInputClient())
+      GetTextInputClient()->OnInputMethodChanged();
+  }
+
+  void OnCompositionChanged(const CompositionText& composition_text) override {
+    if (!text_input_client_)
+      return;
+    text_input_client_->SetCompositionText(composition_text);
+  }
+
+  void OnTextCommitted(const base::string16& text) override {
+    if (!text_input_client_)
+      return;
+    if (text_input_client_->GetTextInputType() == TEXT_INPUT_TYPE_NONE) {
+      // According to the comment in text_input_client.h,
+      // TextInputClient::InsertText should never be called when the
+      // text input type is TEXT_INPUT_TYPE_NONE.
+
+      for (size_t i = 0; i < text.size(); ++i) {
+        ui::KeyEvent char_event(text[i], static_cast<ui::KeyboardCode>(text[i]),
+                                ui::EF_NONE);
+        text_input_client_->InsertChar(char_event);
+      }
+      return;
+    }
+    text_input_client_->InsertText(text);
+  }
+
+  bool CanSendRemoteNotification(
+      const TextInputClient* text_input_client) const {
+    return text_input_client_ &&
+           text_input_client_ == text_input_client &&
+           remote_delegate_;
+  }
+
+  base::ObserverList<InputMethodObserver> observer_list_;
+
+  internal::InputMethodDelegate* delegate_;
+  internal::RemoteInputMethodDelegateWin* remote_delegate_;
+
+  TextInputClient* text_input_client_;
+  std::vector<int32_t> input_scopes_;
+  std::vector<gfx::Rect> composition_character_bounds_;
+  bool is_candidate_popup_open_;
+  bool is_ime_;
+  LANGID langid_;
+
+  DISALLOW_COPY_AND_ASSIGN(RemoteInputMethodWin);
+};
+
+}  // namespace
+
+bool IsRemoteInputMethodWinRequired(gfx::AcceleratedWidget widget) {
+  // If the remote input method is already registered then don't do it again.
+  if (ui::g_public_interface_ && ui::g_private_interface_)
+    return false;
+
+  DWORD process_id = 0;
+  if (GetWindowThreadProcessId(widget, &process_id) == 0)
+    return false;
+  base::win::ScopedHandle process_handle(::OpenProcess(
+      PROCESS_QUERY_LIMITED_INFORMATION, FALSE, process_id));
+  if (!process_handle.IsValid())
+    return false;
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kViewerConnect);
+}
+
+RemoteInputMethodPrivateWin::RemoteInputMethodPrivateWin() {}
+
+scoped_ptr<InputMethod> CreateRemoteInputMethodWin(
+    internal::InputMethodDelegate* delegate) {
+  return make_scoped_ptr(new RemoteInputMethodWin(delegate));
+}
+
+// static
+RemoteInputMethodPrivateWin* RemoteInputMethodPrivateWin::Get(
+    InputMethod* input_method) {
+  return GetPrivate(input_method);
+}
+
+}  // namespace ui