IME (input method editor) support for Aura, part 2 of 3: Add views::InputMethodBridge

ui/views/ime/input_method_bridge.cc

+// 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/views/ime/input_method_bridge.h"
+
+#include "ui/base/ime/input_method.h"
+#include "ui/gfx/rect.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+
+InputMethodBridge::InputMethodBridge(internal::InputMethodDelegate* delegate,
+                                     ui::InputMethod* host)
+    : host_(host),
+      context_focused_(false) {
+  DCHECK(host_);
+  set_delegate(delegate);
+}
+
+InputMethodBridge::~InputMethodBridge() {
+  if (host_->GetTextInputClient() == this)
+    host_->SetFocusedTextInputClient(NULL);
+}
+
+void InputMethodBridge::Init(Widget* widget) {
+  InputMethodBase::Init(widget);
+}
+
+void InputMethodBridge::OnFocus() {
+  DCHECK(!widget_focused());
+  InputMethodBase::OnFocus();
+
+  // Ask the system-wide IME to send all TextInputClient messages to |this|
+  // object.
+  host_->SetFocusedTextInputClient(this);
+
+  // TODO(yusukes): We don't need to call OnTextInputTypeChanged() once we move
+  // text input type tracker code to ui::InputMethodBase.
+  if (GetFocusedView())
+    OnTextInputTypeChanged(GetFocusedView());
+}
+
+void InputMethodBridge::OnBlur() {
+  DCHECK(widget_focused());
+
+  ConfirmCompositionText();
+  InputMethodBase::OnBlur();
+  if (host_->GetTextInputClient() == this)
+    host_->SetFocusedTextInputClient(NULL);
+}
+
+void InputMethodBridge::DispatchKeyEvent(const KeyEvent& key) {
+  DCHECK(key.type() == ui::ET_KEY_PRESSED || key.type() == ui::ET_KEY_RELEASED);
+  DCHECK(widget_focused());
+
+  // We can just dispatch the event here since the |key| is already processed by
+  // the system-wide IME.
+  DispatchKeyEventPostIME(key);
+}
+
+void InputMethodBridge::OnTextInputTypeChanged(View* view) {
+  if (IsViewFocused(view))
+    host_->OnTextInputTypeChanged(this);
+  InputMethodBase::OnTextInputTypeChanged(view);
+}
+
+void InputMethodBridge::OnCaretBoundsChanged(View* view) {
+  if (IsViewFocused(view) && !IsTextInputTypeNone())
+    host_->OnCaretBoundsChanged(this);
+}
+
+void InputMethodBridge::CancelComposition(View* view) {
+  if (IsViewFocused(view))
+    host_->CancelComposition(this);
+}
+
+std::string InputMethodBridge::GetInputLocale() {
+  return host_->GetInputLocale();
+}
+
+base::i18n::TextDirection InputMethodBridge::GetInputTextDirection() {
+  return host_->GetInputTextDirection();
+}
+
+bool InputMethodBridge::IsActive() {
+  return host_->IsActive();
+}
+
+// Overridden from TextInputClient. Forward an event from the system-wide IME
+// to the text input |client|, which is e.g. views::NativeTextfieldViews.
+void InputMethodBridge::SetCompositionText(
+    const ui::CompositionText& composition) {
+  TextInputClient* client = GetTextInputClient();
+  if (client)
+    client->SetCompositionText(composition);
+}
+
+void InputMethodBridge::ConfirmCompositionText() {
+  TextInputClient* client = GetTextInputClient();
+  if (client)
+    client->ConfirmCompositionText();
+}
+
+void InputMethodBridge::ClearCompositionText() {
+  TextInputClient* client = GetTextInputClient();
+  if (client)
+    client->ClearCompositionText();
+}
+
+void InputMethodBridge::InsertText(const string16& text) {
+  TextInputClient* client = GetTextInputClient();
+  if (client)
+    client->InsertText(text);
+}
+
+void InputMethodBridge::InsertChar(char16 ch, int flags) {
+  TextInputClient* client = GetTextInputClient();
+  if (client)
+    client->InsertChar(ch, flags);
+}
+
+ui::TextInputType InputMethodBridge::GetTextInputType() const {
+  TextInputClient* client = GetTextInputClient();
+  return client ? client->GetTextInputType() : ui::TEXT_INPUT_TYPE_NONE;
+}
+
+gfx::Rect InputMethodBridge::GetCaretBounds() {
+  TextInputClient* client = GetTextInputClient();
+  if (!client || !GetFocusedView())
+    return gfx::Rect();
+
+  const gfx::Rect rect = client->GetCaretBounds();
+  gfx::Point origin = rect.origin();
+  gfx::Point end = gfx::Point(rect.right(), rect.bottom());
+  View::ConvertPointToScreen(GetFocusedView(), &origin);
+  View::ConvertPointToScreen(GetFocusedView(), &end);
+  return gfx::Rect(origin.x(),
+                   origin.y(),
+                   end.x() - origin.x(),
+                   end.y() - origin.y());
+}
+
+bool InputMethodBridge::HasCompositionText() {
+  TextInputClient* client = GetTextInputClient();
+  return client ? client->HasCompositionText() : false;
+}
+
+bool InputMethodBridge::GetTextRange(ui::Range* range) {
+  TextInputClient* client = GetTextInputClient();
+  return client ?  client->GetTextRange(range) : false;
+}
+
+bool InputMethodBridge::GetCompositionTextRange(ui::Range* range) {
+  TextInputClient* client = GetTextInputClient();
+  return client ? client->GetCompositionTextRange(range) : false;
+}
+
+bool InputMethodBridge::GetSelectionRange(ui::Range* range) {
+  TextInputClient* client = GetTextInputClient();
+  return client ? client->GetSelectionRange(range) : false;
+}
+
+bool InputMethodBridge::SetSelectionRange(const ui::Range& range) {
+  TextInputClient* client = GetTextInputClient();
+  return client ? client->SetSelectionRange(range) : false;
+}
+
+bool InputMethodBridge::DeleteRange(const ui::Range& range) {
+  TextInputClient* client = GetTextInputClient();
+  return client ? client->DeleteRange(range) : false;
+}
+
+bool InputMethodBridge::GetTextFromRange(
+    const ui::Range& range, string16* text) {
+  TextInputClient* client = GetTextInputClient();
+  return client ? client->GetTextFromRange(range, text) : false;
+}
+
+void InputMethodBridge::OnInputMethodChanged() {
+  TextInputClient* client = GetTextInputClient();
+  if (client)
+    client->OnInputMethodChanged();
+}
+
+bool InputMethodBridge::ChangeTextDirectionAndLayoutAlignment(
+    base::i18n::TextDirection direction) {
+  TextInputClient* client = GetTextInputClient();
+  return client ?
+      client->ChangeTextDirectionAndLayoutAlignment(direction) : false;
+}
+
+// Overridden from FocusChangeListener.
+void InputMethodBridge::OnWillChangeFocus(View* focused_before, View* focused) {
+  ConfirmCompositionText();
+}
+
+void InputMethodBridge::OnDidChangeFocus(View* focused_before, View* focused) {
+  OnTextInputTypeChanged(GetFocusedView());
+  OnCaretBoundsChanged(GetFocusedView());
+}
+
+}  // namespace views