ui/views/ime/input_method_bridge.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/views/ime/input_method_bridge.h"
   6
   7 #include "ui/base/ime/input_method.h"
   8 #include "ui/base/ime/input_method_observer.h"
   9 #include "ui/events/event.h"
  10 #include "ui/gfx/rect.h"
  11 #include "ui/views/view.h"
  12 #include "ui/views/widget/widget.h"
  13
  14 namespace views {
  15
  16 // InputMethodBridge::HostObserver class ---------------------------------------
  17
  18 // An observer class for observing the host input method. When the host input
  19 // method is destroyed, it will null out the |host_| field on the
  20 // InputMethodBridge object.
  21 class InputMethodBridge::HostObserver : public ui::InputMethodObserver {
  22  public:
  23   explicit HostObserver(InputMethodBridge* bridge);
  24   virtual ~HostObserver();
  25
  26   virtual void OnTextInputTypeChanged(
  27       const ui::TextInputClient* client) OVERRIDE {}
  28   virtual void OnFocus() OVERRIDE {}
  29   virtual void OnBlur() OVERRIDE {}
  30   virtual void OnCaretBoundsChanged(
  31       const ui::TextInputClient* client) OVERRIDE {}
  32   virtual void OnTextInputStateChanged(
  33       const ui::TextInputClient* client) OVERRIDE {}
  34   virtual void OnInputMethodDestroyed(
  35       const ui::InputMethod* input_method) OVERRIDE;
  36   virtual void OnShowImeIfNeeded() OVERRIDE {}
  37
  38  private:
  39   InputMethodBridge* bridge_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(HostObserver);
  42 };
  43
  44 InputMethodBridge::HostObserver::HostObserver(InputMethodBridge* bridge)
  45     : bridge_(bridge) {
  46   bridge_->host_->AddObserver(this);
  47 }
  48
  49 InputMethodBridge::HostObserver::~HostObserver() {
  50   if (bridge_->host_)
  51     bridge_->host_->RemoveObserver(this);
  52 }
  53
  54 void InputMethodBridge::HostObserver::OnInputMethodDestroyed(
  55     const ui::InputMethod* input_method) {
  56   DCHECK_EQ(bridge_->host_, input_method);
  57   bridge_->host_->RemoveObserver(this);
  58   bridge_->host_ = NULL;
  59 }
  60
  61 // InputMethodBridge class -----------------------------------------------------
  62
  63 InputMethodBridge::InputMethodBridge(internal::InputMethodDelegate* delegate,
  64                                      ui::InputMethod* host,
  65                                      bool shared_input_method)
  66     : host_(host),
  67       shared_input_method_(shared_input_method) {
  68   DCHECK(host_);
  69   SetDelegate(delegate);
  70
  71   host_observer_.reset(new HostObserver(this));
  72 }
  73
  74 InputMethodBridge::~InputMethodBridge() {
  75   // By the time we get here it's very likely |widget_|'s NativeWidget has been
  76   // destroyed. This means any calls to |widget_| that go to the NativeWidget,
  77   // such as IsActive(), will crash. SetFocusedTextInputClient() may callback to
  78   // this and go into |widget_|. NULL out |widget_| so we don't attempt to use
  79   // it.
  80   DetachFromWidget();
  81
  82   // Host input method might have been destroyed at this point.
  83   if (host_)
  84     host_->DetachTextInputClient(this);
  85 }
  86
  87 void InputMethodBridge::OnFocus() {
  88   DCHECK(host_);
  89
  90   // Direct the shared IME to send TextInputClient messages to |this| object.
  91   if (shared_input_method_ || !host_->GetTextInputClient())
  92     host_->SetFocusedTextInputClient(this);
  93
  94   // TODO(yusukes): We don't need to call OnTextInputTypeChanged() once we move
  95   // text input type tracker code to ui::InputMethodBase.
  96   if (GetFocusedView()) {
  97     OnTextInputTypeChanged(GetFocusedView());
  98     OnCaretBoundsChanged(GetFocusedView());
  99   }
 100 }
 101
 102 void InputMethodBridge::OnBlur() {
 103   DCHECK(host_);
 104
 105   if (HasCompositionText()) {
 106     ConfirmCompositionText();
 107     host_->CancelComposition(this);
 108   }
 109
 110   if (host_->GetTextInputClient() == this)
 111     host_->SetFocusedTextInputClient(NULL);
 112 }
 113
 114 bool InputMethodBridge::OnUntranslatedIMEMessage(const base::NativeEvent& event,
 115                                                  NativeEventResult* result) {
 116   DCHECK(host_);
 117
 118   return host_->OnUntranslatedIMEMessage(event, result);
 119 }
 120
 121 void InputMethodBridge::DispatchKeyEvent(const ui::KeyEvent& key) {
 122   DCHECK(key.type() == ui::ET_KEY_PRESSED || key.type() == ui::ET_KEY_RELEASED);
 123
 124   // We can just dispatch the event here since the |key| is already processed by
 125   // the system-wide IME.
 126   DispatchKeyEventPostIME(key);
 127 }
 128
 129 void InputMethodBridge::OnTextInputTypeChanged(View* view) {
 130   DCHECK(host_);
 131
 132   if (IsViewFocused(view))
 133     host_->OnTextInputTypeChanged(this);
 134   InputMethodBase::OnTextInputTypeChanged(view);
 135 }
 136
 137 void InputMethodBridge::OnCaretBoundsChanged(View* view) {
 138   DCHECK(host_);
 139
 140   if (IsViewFocused(view) && !IsTextInputTypeNone())
 141     host_->OnCaretBoundsChanged(this);
 142 }
 143
 144 void InputMethodBridge::CancelComposition(View* view) {
 145   DCHECK(host_);
 146
 147   if (IsViewFocused(view))
 148     host_->CancelComposition(this);
 149 }
 150
 151 void InputMethodBridge::OnInputLocaleChanged() {
 152   DCHECK(host_);
 153
 154   host_->OnInputLocaleChanged();
 155 }
 156
 157 std::string InputMethodBridge::GetInputLocale() {
 158   DCHECK(host_);
 159
 160   return host_->GetInputLocale();
 161 }
 162
 163 bool InputMethodBridge::IsActive() {
 164   DCHECK(host_);
 165
 166   return host_->IsActive();
 167 }
 168
 169 bool InputMethodBridge::IsCandidatePopupOpen() const {
 170   DCHECK(host_);
 171
 172   return host_->IsCandidatePopupOpen();
 173 }
 174
 175 void InputMethodBridge::ShowImeIfNeeded() {
 176   DCHECK(host_);
 177   host_->ShowImeIfNeeded();
 178 }
 179
 180 // Overridden from TextInputClient. Forward an event from the system-wide IME
 181 // to the text input |client|, which is e.g. views::Textfield.
 182 void InputMethodBridge::SetCompositionText(
 183     const ui::CompositionText& composition) {
 184   TextInputClient* client = GetTextInputClient();
 185   if (client)
 186     client->SetCompositionText(composition);
 187 }
 188
 189 void InputMethodBridge::ConfirmCompositionText() {
 190   TextInputClient* client = GetTextInputClient();
 191   if (client)
 192     client->ConfirmCompositionText();
 193 }
 194
 195 void InputMethodBridge::ClearCompositionText() {
 196   TextInputClient* client = GetTextInputClient();
 197   if (client)
 198     client->ClearCompositionText();
 199 }
 200
 201 void InputMethodBridge::InsertText(const base::string16& text) {
 202   TextInputClient* client = GetTextInputClient();
 203   if (client)
 204     client->InsertText(text);
 205 }
 206
 207 void InputMethodBridge::InsertChar(base::char16 ch, int flags) {
 208   TextInputClient* client = GetTextInputClient();
 209   if (client)
 210     client->InsertChar(ch, flags);
 211 }
 212
 213 gfx::NativeWindow InputMethodBridge::GetAttachedWindow() const {
 214   TextInputClient* client = GetTextInputClient();
 215   return client ?
 216       client->GetAttachedWindow() : static_cast<gfx::NativeWindow>(NULL);
 217 }
 218
 219 ui::TextInputType InputMethodBridge::GetTextInputType() const {
 220   TextInputClient* client = GetTextInputClient();
 221   return client ? client->GetTextInputType() : ui::TEXT_INPUT_TYPE_NONE;
 222 }
 223
 224 ui::TextInputMode InputMethodBridge::GetTextInputMode() const {
 225   TextInputClient* client = GetTextInputClient();
 226   return client ? client->GetTextInputMode() : ui::TEXT_INPUT_MODE_DEFAULT;
 227 }
 228
 229 bool InputMethodBridge::CanComposeInline() const {
 230   TextInputClient* client = GetTextInputClient();
 231   return client ? client->CanComposeInline() : true;
 232 }
 233
 234 gfx::Rect InputMethodBridge::GetCaretBounds() const {
 235   TextInputClient* client = GetTextInputClient();
 236   if (!client)
 237     return gfx::Rect();
 238
 239   return client->GetCaretBounds();
 240 }
 241
 242 bool InputMethodBridge::GetCompositionCharacterBounds(uint32 index,
 243                                                       gfx::Rect* rect) const {
 244   DCHECK(rect);
 245   TextInputClient* client = GetTextInputClient();
 246   if (!client)
 247     return false;
 248
 249   return client->GetCompositionCharacterBounds(index, rect);
 250 }
 251
 252 bool InputMethodBridge::HasCompositionText() const {
 253   TextInputClient* client = GetTextInputClient();
 254   return client ? client->HasCompositionText() : false;
 255 }
 256
 257 bool InputMethodBridge::GetTextRange(gfx::Range* range) const {
 258   TextInputClient* client = GetTextInputClient();
 259   return client ?  client->GetTextRange(range) : false;
 260 }
 261
 262 bool InputMethodBridge::GetCompositionTextRange(gfx::Range* range) const {
 263   TextInputClient* client = GetTextInputClient();
 264   return client ? client->GetCompositionTextRange(range) : false;
 265 }
 266
 267 bool InputMethodBridge::GetSelectionRange(gfx::Range* range) const {
 268   TextInputClient* client = GetTextInputClient();
 269   return client ? client->GetSelectionRange(range) : false;
 270 }
 271
 272 bool InputMethodBridge::SetSelectionRange(const gfx::Range& range) {
 273   TextInputClient* client = GetTextInputClient();
 274   return client ? client->SetSelectionRange(range) : false;
 275 }
 276
 277 bool InputMethodBridge::DeleteRange(const gfx::Range& range) {
 278   TextInputClient* client = GetTextInputClient();
 279   return client ? client->DeleteRange(range) : false;
 280 }
 281
 282 bool InputMethodBridge::GetTextFromRange(const gfx::Range& range,
 283                                          base::string16* text) const {
 284   TextInputClient* client = GetTextInputClient();
 285   return client ? client->GetTextFromRange(range, text) : false;
 286 }
 287
 288 void InputMethodBridge::OnInputMethodChanged() {
 289   TextInputClient* client = GetTextInputClient();
 290   if (client)
 291     client->OnInputMethodChanged();
 292 }
 293
 294 bool InputMethodBridge::ChangeTextDirectionAndLayoutAlignment(
 295     base::i18n::TextDirection direction) {
 296   TextInputClient* client = GetTextInputClient();
 297   return client ?
 298       client->ChangeTextDirectionAndLayoutAlignment(direction) : false;
 299 }
 300
 301 void InputMethodBridge::ExtendSelectionAndDelete(size_t before, size_t after) {
 302   TextInputClient* client = GetTextInputClient();
 303   if (client)
 304     client->ExtendSelectionAndDelete(before, after);
 305 }
 306
 307 void InputMethodBridge::EnsureCaretInRect(const gfx::Rect& rect) {
 308   TextInputClient* client = GetTextInputClient();
 309   if (client)
 310     client->EnsureCaretInRect(rect);
 311 }
 312
 313 void InputMethodBridge::OnCandidateWindowShown() {
 314 }
 315
 316 void InputMethodBridge::OnCandidateWindowUpdated() {
 317 }
 318
 319 void InputMethodBridge::OnCandidateWindowHidden() {
 320 }
 321
 322 // Overridden from FocusChangeListener.
 323 void InputMethodBridge::OnWillChangeFocus(View* focused_before, View* focused) {
 324   if (HasCompositionText()) {
 325     ConfirmCompositionText();
 326     CancelComposition(focused_before);
 327   }
 328 }
 329
 330 void InputMethodBridge::OnDidChangeFocus(View* focused_before, View* focused) {
 331   DCHECK_EQ(GetFocusedView(), focused);
 332   OnTextInputTypeChanged(focused);
 333   OnCaretBoundsChanged(focused);
 334 }
 335
 336 ui::InputMethod* InputMethodBridge::GetHostInputMethod() const {
 337   return host_;
 338 }
 339
 340
 341 }  // namespace views