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      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/base/ime/input_method_win.h"
      6 
      7 #include "base/basictypes.h"
      8 #include "ui/base/ime/text_input_client.h"
      9 #include "ui/base/ime/win/tsf_input_scope.h"
     10 #include "ui/events/event.h"
     11 #include "ui/events/event_constants.h"
     12 #include "ui/events/event_utils.h"
     13 #include "ui/events/keycodes/keyboard_codes.h"
     14 #include "ui/gfx/win/dpi.h"
     15 #include "ui/gfx/win/hwnd_util.h"
     16 
     17 namespace ui {
     18 namespace {
     19 
     20 // Extra number of chars before and after selection (or composition) range which
     21 // is returned to IME for improving conversion accuracy.
     22 static const size_t kExtraNumberOfChars = 20;
     23 
     24 }  // namespace
     25 
     26 InputMethodWin::InputMethodWin(internal::InputMethodDelegate* delegate,
     27                                HWND toplevel_window_handle)
     28     : toplevel_window_handle_(toplevel_window_handle),
     29       pending_requested_direction_(base::i18n::UNKNOWN_DIRECTION),
     30       accept_carriage_return_(false),
     31       active_(false),
     32       enabled_(false),
     33       is_candidate_popup_open_(false),
     34       composing_window_handle_(NULL) {
     35   SetDelegate(delegate);
     36   // In non-Aura environment, appropriate callbacks to OnFocus() and OnBlur()
     37   // are not implemented yet. To work around this limitation, here we use
     38   // "always focused" model.
     39   // TODO(ime): Fix the caller of OnFocus() and OnBlur() so that appropriate
     40   // focus event will be passed.
     41   InputMethodBase::OnFocus();
     42 }
     43 
     44 void InputMethodWin::Init(bool focused) {
     45   // Gets the initial input locale.
     46   OnInputLocaleChanged();
     47 
     48   InputMethodBase::Init(focused);
     49 }
     50 
     51 void InputMethodWin::OnFocus() {
     52   // Ignore OnFocus event for "always focused" model. See the comment in the
     53   // constructor.
     54   // TODO(ime): Implement OnFocus once the callers are fixed.
     55 }
     56 
     57 void InputMethodWin::OnBlur() {
     58   // Ignore OnBlur event for "always focused" model. See the comment in the
     59   // constructor.
     60   // TODO(ime): Implement OnFocus once the callers are fixed.
     61 }
     62 
     63 bool InputMethodWin::OnUntranslatedIMEMessage(
     64     const base::NativeEvent& event,
     65     InputMethod::NativeEventResult* result) {
     66   LRESULT original_result = 0;
     67   BOOL handled = FALSE;
     68   switch (event.message) {
     69     case WM_IME_SETCONTEXT:
     70       original_result = OnImeSetContext(
     71           event.hwnd, event.message, event.wParam, event.lParam, &handled);
     72       break;
     73     case WM_IME_STARTCOMPOSITION:
     74       original_result = OnImeStartComposition(
     75           event.hwnd, event.message, event.wParam, event.lParam, &handled);
     76       break;
     77     case WM_IME_COMPOSITION:
     78       original_result = OnImeComposition(
     79           event.hwnd, event.message, event.wParam, event.lParam, &handled);
     80       break;
     81     case WM_IME_ENDCOMPOSITION:
     82       original_result = OnImeEndComposition(
     83           event.hwnd, event.message, event.wParam, event.lParam, &handled);
     84       break;
     85     case WM_IME_REQUEST:
     86       original_result = OnImeRequest(
     87           event.message, event.wParam, event.lParam, &handled);
     88       break;
     89     case WM_CHAR:
     90     case WM_SYSCHAR:
     91       original_result = OnChar(
     92           event.hwnd, event.message, event.wParam, event.lParam, &handled);
     93       break;
     94     case WM_IME_NOTIFY:
     95       original_result = OnImeNotify(
     96           event.message, event.wParam, event.lParam, &handled);
     97       break;
     98     default:
     99       NOTREACHED() << "Unknown IME message:" << event.message;
    100       break;
    101   }
    102   if (result)
    103     *result = original_result;
    104   return !!handled;
    105 }
    106 
    107 bool InputMethodWin::DispatchKeyEvent(const ui::KeyEvent& event) {
    108   if (!event.HasNativeEvent())
    109     return DispatchFabricatedKeyEvent(event);
    110 
    111   const base::NativeEvent& native_key_event = event.native_event();
    112   if (native_key_event.message == WM_CHAR) {
    113     BOOL handled;
    114     OnChar(native_key_event.hwnd, native_key_event.message,
    115            native_key_event.wParam, native_key_event.lParam, &handled);
    116     return !!handled;  // Don't send WM_CHAR for post event processing.
    117   }
    118   // Handles ctrl-shift key to change text direction and layout alignment.
    119   if (ui::IMM32Manager::IsRTLKeyboardLayoutInstalled() &&
    120       !IsTextInputTypeNone()) {
    121     // TODO: shouldn't need to generate a KeyEvent here.
    122     const ui::KeyEvent key(native_key_event);
    123     ui::KeyboardCode code = key.key_code();
    124     if (key.type() == ui::ET_KEY_PRESSED) {
    125       if (code == ui::VKEY_SHIFT) {
    126         base::i18n::TextDirection dir;
    127         if (ui::IMM32Manager::IsCtrlShiftPressed(&dir))
    128           pending_requested_direction_ = dir;
    129       } else if (code != ui::VKEY_CONTROL) {
    130         pending_requested_direction_ = base::i18n::UNKNOWN_DIRECTION;
    131       }
    132     } else if (key.type() == ui::ET_KEY_RELEASED &&
    133                (code == ui::VKEY_SHIFT || code == ui::VKEY_CONTROL) &&
    134                pending_requested_direction_ != base::i18n::UNKNOWN_DIRECTION) {
    135       GetTextInputClient()->ChangeTextDirectionAndLayoutAlignment(
    136           pending_requested_direction_);
    137       pending_requested_direction_ = base::i18n::UNKNOWN_DIRECTION;
    138     }
    139   }
    140 
    141   return DispatchKeyEventPostIME(event);
    142 }
    143 
    144 void InputMethodWin::OnTextInputTypeChanged(const TextInputClient* client) {
    145   if (!IsTextInputClientFocused(client) || !IsWindowFocused(client))
    146     return;
    147   imm32_manager_.CancelIME(GetAttachedWindowHandle(client));
    148   UpdateIMEState();
    149 }
    150 
    151 void InputMethodWin::OnCaretBoundsChanged(const TextInputClient* client) {
    152   if (!enabled_ || !IsTextInputClientFocused(client) ||
    153       !IsWindowFocused(client)) {
    154     return;
    155   }
    156   // The current text input type should not be NONE if |client| is focused.
    157   DCHECK(!IsTextInputTypeNone());
    158   // Tentatively assume that the returned value is DIP (Density Independent
    159   // Pixel). See the comment in text_input_client.h and http://crbug.com/360334.
    160   const gfx::Rect dip_screen_bounds(GetTextInputClient()->GetCaretBounds());
    161   const gfx::Rect screen_bounds = gfx::win::DIPToScreenRect(dip_screen_bounds);
    162 
    163   HWND attached_window = GetAttachedWindowHandle(client);
    164   // TODO(ime): see comment in TextInputClient::GetCaretBounds(), this
    165   // conversion shouldn't be necessary.
    166   RECT r = {};
    167   GetClientRect(attached_window, &r);
    168   POINT window_point = { screen_bounds.x(), screen_bounds.y() };
    169   ScreenToClient(attached_window, &window_point);
    170   gfx::Rect caret_rect(gfx::Point(window_point.x, window_point.y),
    171                        screen_bounds.size());
    172   imm32_manager_.UpdateCaretRect(attached_window, caret_rect);
    173 }
    174 
    175 void InputMethodWin::CancelComposition(const TextInputClient* client) {
    176   if (enabled_ && IsTextInputClientFocused(client))
    177     imm32_manager_.CancelIME(GetAttachedWindowHandle(client));
    178 }
    179 
    180 void InputMethodWin::OnInputLocaleChanged() {
    181   active_ = imm32_manager_.SetInputLanguage();
    182   locale_ = imm32_manager_.GetInputLanguageName();
    183   OnInputMethodChanged();
    184 }
    185 
    186 std::string InputMethodWin::GetInputLocale() {
    187   return locale_;
    188 }
    189 
    190 bool InputMethodWin::IsActive() {
    191   return active_;
    192 }
    193 
    194 bool InputMethodWin::IsCandidatePopupOpen() const {
    195   return is_candidate_popup_open_;
    196 }
    197 
    198 void InputMethodWin::OnWillChangeFocusedClient(TextInputClient* focused_before,
    199                                                TextInputClient* focused) {
    200   if (IsWindowFocused(focused_before))
    201     ConfirmCompositionText();
    202 }
    203 
    204 void InputMethodWin::OnDidChangeFocusedClient(
    205     TextInputClient* focused_before,
    206     TextInputClient* focused) {
    207   if (IsWindowFocused(focused)) {
    208     // Force to update the input type since client's TextInputStateChanged()
    209     // function might not be called if text input types before the client loses
    210     // focus and after it acquires focus again are the same.
    211     OnTextInputTypeChanged(focused);
    212 
    213     UpdateIMEState();
    214 
    215     // Force to update caret bounds, in case the client thinks that the caret
    216     // bounds has not changed.
    217     OnCaretBoundsChanged(focused);
    218   }
    219   if (focused_before != focused)
    220     accept_carriage_return_ = false;
    221 }
    222 
    223 LRESULT InputMethodWin::OnChar(HWND window_handle,
    224                                UINT message,
    225                                WPARAM wparam,
    226                                LPARAM lparam,
    227                                BOOL* handled) {
    228   *handled = TRUE;
    229 
    230   // We need to send character events to the focused text input client event if
    231   // its text input type is ui::TEXT_INPUT_TYPE_NONE.
    232   if (GetTextInputClient()) {
    233     const base::char16 kCarriageReturn = L'\r';
    234     const base::char16 ch = static_cast<base::char16>(wparam);
    235     // A mask to determine the previous key state from |lparam|. The value is 1
    236     // if the key is down before the message is sent, or it is 0 if the key is
    237     // up.
    238     const uint32 kPrevKeyDownBit = 0x40000000;
    239     if (ch == kCarriageReturn && !(lparam & kPrevKeyDownBit))
    240       accept_carriage_return_ = true;
    241     // Conditionally ignore '\r' events to work around crbug.com/319100.
    242     // TODO(yukawa, IME): Figure out long-term solution.
    243     if (ch != kCarriageReturn || accept_carriage_return_)
    244       GetTextInputClient()->InsertChar(ch, ui::GetModifiersFromKeyState());
    245   }
    246 
    247   // Explicitly show the system menu at a good location on [Alt]+[Space].
    248   // Note: Setting |handled| to FALSE for DefWindowProc triggering of the system
    249   //       menu causes undesirable titlebar artifacts in the classic theme.
    250   if (message == WM_SYSCHAR && wparam == VK_SPACE)
    251     gfx::ShowSystemMenu(window_handle);
    252 
    253   return 0;
    254 }
    255 
    256 LRESULT InputMethodWin::OnImeSetContext(HWND window_handle,
    257                                         UINT message,
    258                                         WPARAM wparam,
    259                                         LPARAM lparam,
    260                                         BOOL* handled) {
    261   if (!!wparam)
    262     imm32_manager_.CreateImeWindow(window_handle);
    263 
    264   OnInputMethodChanged();
    265   return imm32_manager_.SetImeWindowStyle(
    266       window_handle, message, wparam, lparam, handled);
    267 }
    268 
    269 LRESULT InputMethodWin::OnImeStartComposition(HWND window_handle,
    270                                               UINT message,
    271                                               WPARAM wparam,
    272                                               LPARAM lparam,
    273                                               BOOL* handled) {
    274   // We have to prevent WTL from calling ::DefWindowProc() because the function
    275   // calls ::ImmSetCompositionWindow() and ::ImmSetCandidateWindow() to
    276   // over-write the position of IME windows.
    277   *handled = TRUE;
    278 
    279   // Reset the composition status and create IME windows.
    280   composing_window_handle_ = window_handle;
    281   imm32_manager_.CreateImeWindow(window_handle);
    282   imm32_manager_.ResetComposition(window_handle);
    283   return 0;
    284 }
    285 
    286 LRESULT InputMethodWin::OnImeComposition(HWND window_handle,
    287                                          UINT message,
    288                                          WPARAM wparam,
    289                                          LPARAM lparam,
    290                                          BOOL* handled) {
    291   // We have to prevent WTL from calling ::DefWindowProc() because we do not
    292   // want for the IMM (Input Method Manager) to send WM_IME_CHAR messages.
    293   *handled = TRUE;
    294 
    295   // At first, update the position of the IME window.
    296   imm32_manager_.UpdateImeWindow(window_handle);
    297 
    298   // Retrieve the result string and its attributes of the ongoing composition
    299   // and send it to a renderer process.
    300   ui::CompositionText composition;
    301   if (imm32_manager_.GetResult(window_handle, lparam, &composition.text)) {
    302     if (!IsTextInputTypeNone())
    303       GetTextInputClient()->InsertText(composition.text);
    304     imm32_manager_.ResetComposition(window_handle);
    305     // Fall though and try reading the composition string.
    306     // Japanese IMEs send a message containing both GCS_RESULTSTR and
    307     // GCS_COMPSTR, which means an ongoing composition has been finished
    308     // by the start of another composition.
    309   }
    310   // Retrieve the composition string and its attributes of the ongoing
    311   // composition and send it to a renderer process.
    312   if (imm32_manager_.GetComposition(window_handle, lparam, &composition) &&
    313       !IsTextInputTypeNone())
    314     GetTextInputClient()->SetCompositionText(composition);
    315 
    316   return 0;
    317 }
    318 
    319 LRESULT InputMethodWin::OnImeEndComposition(HWND window_handle,
    320                                             UINT message,
    321                                             WPARAM wparam,
    322                                             LPARAM lparam,
    323                                             BOOL* handled) {
    324   // Let WTL call ::DefWindowProc() and release its resources.
    325   *handled = FALSE;
    326 
    327   composing_window_handle_ = NULL;
    328 
    329   if (!IsTextInputTypeNone() && GetTextInputClient()->HasCompositionText())
    330     GetTextInputClient()->ClearCompositionText();
    331 
    332   imm32_manager_.ResetComposition(window_handle);
    333   imm32_manager_.DestroyImeWindow(window_handle);
    334   return 0;
    335 }
    336 
    337 LRESULT InputMethodWin::OnImeNotify(UINT message,
    338                                     WPARAM wparam,
    339                                     LPARAM lparam,
    340                                     BOOL* handled) {
    341   *handled = FALSE;
    342 
    343   bool previous_state = is_candidate_popup_open_;
    344 
    345   // Update |is_candidate_popup_open_|, whether a candidate window is open.
    346   switch (wparam) {
    347   case IMN_OPENCANDIDATE:
    348     is_candidate_popup_open_ = true;
    349     if (!previous_state)
    350       OnCandidateWindowShown();
    351     break;
    352   case IMN_CLOSECANDIDATE:
    353     is_candidate_popup_open_ = false;
    354     if (previous_state)
    355       OnCandidateWindowHidden();
    356     break;
    357   case IMN_CHANGECANDIDATE:
    358     // TODO(kochi): The IME API expects this event to notify window size change,
    359     // while this may fire more often without window resize. There is no generic
    360     // way to get bounds of candidate window.
    361     OnCandidateWindowUpdated();
    362     break;
    363   }
    364 
    365   return 0;
    366 }
    367 
    368 LRESULT InputMethodWin::OnImeRequest(UINT message,
    369                                      WPARAM wparam,
    370                                      LPARAM lparam,
    371                                      BOOL* handled) {
    372   *handled = FALSE;
    373 
    374   // Should not receive WM_IME_REQUEST message, if IME is disabled.
    375   const ui::TextInputType type = GetTextInputType();
    376   if (type == ui::TEXT_INPUT_TYPE_NONE ||
    377       type == ui::TEXT_INPUT_TYPE_PASSWORD) {
    378     return 0;
    379   }
    380 
    381   switch (wparam) {
    382     case IMR_RECONVERTSTRING:
    383       *handled = TRUE;
    384       return OnReconvertString(reinterpret_cast<RECONVERTSTRING*>(lparam));
    385     case IMR_DOCUMENTFEED:
    386       *handled = TRUE;
    387       return OnDocumentFeed(reinterpret_cast<RECONVERTSTRING*>(lparam));
    388     case IMR_QUERYCHARPOSITION:
    389       *handled = TRUE;
    390       return OnQueryCharPosition(reinterpret_cast<IMECHARPOSITION*>(lparam));
    391     default:
    392       return 0;
    393   }
    394 }
    395 
    396 LRESULT InputMethodWin::OnDocumentFeed(RECONVERTSTRING* reconv) {
    397   ui::TextInputClient* client = GetTextInputClient();
    398   if (!client)
    399     return 0;
    400 
    401   gfx::Range text_range;
    402   if (!client->GetTextRange(&text_range) || text_range.is_empty())
    403     return 0;
    404 
    405   bool result = false;
    406   gfx::Range target_range;
    407   if (client->HasCompositionText())
    408     result = client->GetCompositionTextRange(&target_range);
    409 
    410   if (!result || target_range.is_empty()) {
    411     if (!client->GetSelectionRange(&target_range) ||
    412         !target_range.IsValid()) {
    413       return 0;
    414     }
    415   }
    416 
    417   if (!text_range.Contains(target_range))
    418     return 0;
    419 
    420   if (target_range.GetMin() - text_range.start() > kExtraNumberOfChars)
    421     text_range.set_start(target_range.GetMin() - kExtraNumberOfChars);
    422 
    423   if (text_range.end() - target_range.GetMax() > kExtraNumberOfChars)
    424     text_range.set_end(target_range.GetMax() + kExtraNumberOfChars);
    425 
    426   size_t len = text_range.length();
    427   size_t need_size = sizeof(RECONVERTSTRING) + len * sizeof(WCHAR);
    428 
    429   if (!reconv)
    430     return need_size;
    431 
    432   if (reconv->dwSize < need_size)
    433     return 0;
    434 
    435   base::string16 text;
    436   if (!GetTextInputClient()->GetTextFromRange(text_range, &text))
    437     return 0;
    438   DCHECK_EQ(text_range.length(), text.length());
    439 
    440   reconv->dwVersion = 0;
    441   reconv->dwStrLen = len;
    442   reconv->dwStrOffset = sizeof(RECONVERTSTRING);
    443   reconv->dwCompStrLen =
    444       client->HasCompositionText() ? target_range.length() : 0;
    445   reconv->dwCompStrOffset =
    446       (target_range.GetMin() - text_range.start()) * sizeof(WCHAR);
    447   reconv->dwTargetStrLen = target_range.length();
    448   reconv->dwTargetStrOffset = reconv->dwCompStrOffset;
    449 
    450   memcpy((char*)reconv + sizeof(RECONVERTSTRING),
    451          text.c_str(), len * sizeof(WCHAR));
    452 
    453   // According to Microsoft API document, IMR_RECONVERTSTRING and
    454   // IMR_DOCUMENTFEED should return reconv, but some applications return
    455   // need_size.
    456   return reinterpret_cast<LRESULT>(reconv);
    457 }
    458 
    459 LRESULT InputMethodWin::OnReconvertString(RECONVERTSTRING* reconv) {
    460   ui::TextInputClient* client = GetTextInputClient();
    461   if (!client)
    462     return 0;
    463 
    464   // If there is a composition string already, we don't allow reconversion.
    465   if (client->HasCompositionText())
    466     return 0;
    467 
    468   gfx::Range text_range;
    469   if (!client->GetTextRange(&text_range) || text_range.is_empty())
    470     return 0;
    471 
    472   gfx::Range selection_range;
    473   if (!client->GetSelectionRange(&selection_range) ||
    474       selection_range.is_empty()) {
    475     return 0;
    476   }
    477 
    478   DCHECK(text_range.Contains(selection_range));
    479 
    480   size_t len = selection_range.length();
    481   size_t need_size = sizeof(RECONVERTSTRING) + len * sizeof(WCHAR);
    482 
    483   if (!reconv)
    484     return need_size;
    485 
    486   if (reconv->dwSize < need_size)
    487     return 0;
    488 
    489   // TODO(penghuang): Return some extra context to help improve IME's
    490   // reconversion accuracy.
    491   base::string16 text;
    492   if (!GetTextInputClient()->GetTextFromRange(selection_range, &text))
    493     return 0;
    494   DCHECK_EQ(selection_range.length(), text.length());
    495 
    496   reconv->dwVersion = 0;
    497   reconv->dwStrLen = len;
    498   reconv->dwStrOffset = sizeof(RECONVERTSTRING);
    499   reconv->dwCompStrLen = len;
    500   reconv->dwCompStrOffset = 0;
    501   reconv->dwTargetStrLen = len;
    502   reconv->dwTargetStrOffset = 0;
    503 
    504   memcpy(reinterpret_cast<char*>(reconv) + sizeof(RECONVERTSTRING),
    505          text.c_str(), len * sizeof(WCHAR));
    506 
    507   // According to Microsoft API document, IMR_RECONVERTSTRING and
    508   // IMR_DOCUMENTFEED should return reconv, but some applications return
    509   // need_size.
    510   return reinterpret_cast<LRESULT>(reconv);
    511 }
    512 
    513 LRESULT InputMethodWin::OnQueryCharPosition(IMECHARPOSITION* char_positon) {
    514   if (!char_positon)
    515     return 0;
    516 
    517   if (char_positon->dwSize < sizeof(IMECHARPOSITION))
    518     return 0;
    519 
    520   ui::TextInputClient* client = GetTextInputClient();
    521   if (!client)
    522     return 0;
    523 
    524   // Tentatively assume that the returned value from |client| is DIP (Density
    525   // Independent Pixel). See the comment in text_input_client.h and
    526   // http://crbug.com/360334.
    527   gfx::Rect dip_rect;
    528   if (client->HasCompositionText()) {
    529     if (!client->GetCompositionCharacterBounds(char_positon->dwCharPos,
    530                                                &dip_rect)) {
    531       return 0;
    532     }
    533   } else {
    534     // If there is no composition and the first character is queried, returns
    535     // the caret bounds. This behavior is the same to that of RichEdit control.
    536     if (char_positon->dwCharPos != 0)
    537       return 0;
    538     dip_rect = client->GetCaretBounds();
    539   }
    540   const gfx::Rect rect = gfx::win::DIPToScreenRect(dip_rect);
    541 
    542   char_positon->pt.x = rect.x();
    543   char_positon->pt.y = rect.y();
    544   char_positon->cLineHeight = rect.height();
    545   return 1;  // returns non-zero value when succeeded.
    546 }
    547 
    548 HWND InputMethodWin::GetAttachedWindowHandle(
    549   const TextInputClient* text_input_client) const {
    550   // On Aura environment, we can assume that |toplevel_window_handle_| always
    551   // represents the valid top-level window handle because each top-level window
    552   // is responsible for lifecycle management of corresponding InputMethod
    553   // instance.
    554   return toplevel_window_handle_;
    555 }
    556 
    557 bool InputMethodWin::IsWindowFocused(const TextInputClient* client) const {
    558   if (!client)
    559     return false;
    560   HWND attached_window_handle = GetAttachedWindowHandle(client);
    561   // When Aura is enabled, |attached_window_handle| should always be a top-level
    562   // window. So we can safely assume that |attached_window_handle| is ready for
    563   // receiving keyboard input as long as it is an active window. This works well
    564   // even when the |attached_window_handle| becomes active but has not received
    565   // WM_FOCUS yet.
    566   return attached_window_handle && GetActiveWindow() == attached_window_handle;
    567 }
    568 
    569 bool InputMethodWin::DispatchFabricatedKeyEvent(const ui::KeyEvent& event) {
    570   if (event.is_char()) {
    571     if (GetTextInputClient()) {
    572       GetTextInputClient()->InsertChar(event.key_code(),
    573                                        ui::GetModifiersFromKeyState());
    574       return true;
    575     }
    576   }
    577   return DispatchKeyEventPostIME(event);
    578 }
    579 
    580 void InputMethodWin::ConfirmCompositionText() {
    581   if (composing_window_handle_)
    582     imm32_manager_.CleanupComposition(composing_window_handle_);
    583 
    584   if (!IsTextInputTypeNone()) {
    585     // Though above line should confirm the client's composition text by sending
    586     // a result text to us, in case the input method and the client are in
    587     // inconsistent states, we check the client's composition state again.
    588     if (GetTextInputClient()->HasCompositionText())
    589       GetTextInputClient()->ConfirmCompositionText();
    590   }
    591 }
    592 
    593 void InputMethodWin::UpdateIMEState() {
    594   // Use switch here in case we are going to add more text input types.
    595   // We disable input method in password field.
    596   const HWND window_handle = GetAttachedWindowHandle(GetTextInputClient());
    597   const TextInputType text_input_type = GetTextInputType();
    598   const TextInputMode text_input_mode = GetTextInputMode();
    599   switch (text_input_type) {
    600     case ui::TEXT_INPUT_TYPE_NONE:
    601     case ui::TEXT_INPUT_TYPE_PASSWORD:
    602       imm32_manager_.DisableIME(window_handle);
    603       enabled_ = false;
    604       break;
    605     default:
    606       imm32_manager_.EnableIME(window_handle);
    607       enabled_ = true;
    608       break;
    609   }
    610 
    611   imm32_manager_.SetTextInputMode(window_handle, text_input_mode);
    612   tsf_inputscope::SetInputScopeForTsfUnawareWindow(
    613       window_handle, text_input_type, text_input_mode);
    614 }
    615 
    616 }  // namespace ui
    617