IME (input method editor) support for Aura, part 3 of 3: Use ui::InputMethod in ash.

ui/aura_shell/input_method_event_filter.cc

Index: ui/aura_shell/input_method_event_filter.cc
diff --git a/ui/aura_shell/input_method_event_filter.cc b/ui/aura_shell/input_method_event_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8a794db30bd969150ab2b97dd3527870563fdd85
--- /dev/null
+++ b/ui/aura_shell/input_method_event_filter.cc
@@ -0,0 +1,98 @@
+// Copyright (c) 2011 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/aura_shell/input_method_event_filter.h"
+
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/event.h"
+#include "ui/aura/root_window.h"
+#include "ui/aura_shell/shell.h"
+#include "ui/base/ime/input_method.h"
+#include "ui/base/ime/input_method_factory.h"
+
+namespace aura_shell {
+namespace internal {
+
+////////////////////////////////////////////////////////////////////////////////
+// InputMethodEventFilter, public:
+
+InputMethodEventFilter::InputMethodEventFilter()
+    : EventFilter(aura::RootWindow::GetInstance()),
+      ALLOW_THIS_IN_INITIALIZER_LIST(
+          input_method_(ui::CreateInputMethod(this))),
+      root_window_destroyed_(false) {
+  aura::RootWindow* root_window = aura::RootWindow::GetInstance();
+
+  // TODO(yusukes): Check if the root window is currently focused and pass the
+  // result to Init().
+  input_method_->Init(true);
+  root_window->SetProperty(aura::kRootWindowInputMethod, input_method_.get());
+  root_window->AddObserver(this);
+}
+
+InputMethodEventFilter::~InputMethodEventFilter() {
+  if (root_window_destroyed_) {
+    // On Linux and Chrome OS, RootWindow is deleted before this function is
+    // called (see RootWindowHostLinux::WillDestroyCurrentMessageLoop in for
+    // details). In this case, calling RootWindow::GetInstance here results in
+    // regeneration of the singleton which is not what we want to do.
+    return;
+  }
+  aura::RootWindow* root_window = aura::RootWindow::GetInstance();
+  root_window->SetProperty(aura::kRootWindowInputMethod, NULL);
+  root_window->RemoveObserver(this);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// InputMethodEventFilter, EventFilter implementation:
+
+bool InputMethodEventFilter::PreHandleKeyEvent(aura::Window* target,
+                                               aura::KeyEvent* event) {
+  input_method_->DispatchKeyEvent(event->native_event());
+  return true;
+}
+
+bool InputMethodEventFilter::PreHandleTranslatedKeyEvent(
+    aura::Window* target,
+    aura::TranslatedKeyEvent* event) {
+  return false;
+}
+
+bool InputMethodEventFilter::PreHandleMouseEvent(aura::Window* target,
+                                                 aura::MouseEvent* event) {
+  return false;
+}
+
+ui::TouchStatus InputMethodEventFilter::PreHandleTouchEvent(
+    aura::Window* target,
+    aura::TouchEvent* event) {
+  return ui::TOUCH_STATUS_UNKNOWN;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// InputMethodEventFilter, ui::InputMethodDelegate implementation:
+
+void InputMethodEventFilter::DispatchKeyEventPostIME(
+    const base::NativeEvent& event) {
+  aura::TranslatedKeyEvent aura_event(event, false /* is_char */);
+  aura::RootWindow::GetInstance()->DispatchTranslatedKeyEvent(&aura_event);
+}
+
+void InputMethodEventFilter::DispatchFabricatedKeyEventPostIME(
+    ui::EventType type,
+    ui::KeyboardCode key_code,
+    int flags) {
+  aura::TranslatedKeyEvent aura_event(type, key_code, flags);
+  aura::RootWindow::GetInstance()->DispatchTranslatedKeyEvent(&aura_event);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// InputMethodEventFilter, aura::WindowObserver implementation:
+
+void InputMethodEventFilter::OnWindowDestroyed(aura::Window* window) {
+  root_window_destroyed_ = true;
+}
+
+}  // namespace internal
+}  // namespace aura_shell