TsfTextStore implementation.

ui/base/win/tsf_text_store.cc

 // Copyright (c) 2012 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/win/tsf_text_store.h"
 
 #include <OleCtl.h>
-#include "base/logging.h"
+#include "base/win/scoped_variant.h"
+#include "ui/base/ime/text_input_client.h"
+#include "ui/gfx/rect.h"
 
 namespace ui {
+namespace {
+// We support only one view.
+const TsViewCookie kViewCookie = 1;
+}  // namespace
 
 TsfTextStore::TsfTextStore()
     : ref_count_(0),
-      text_store_acp_sink_mask_(0) {
+      text_store_acp_sink_mask_(0),
+      window_handle_(NULL),
+      text_input_client_(NULL),
+      committed_size_(0),
+      edit_flag_(false),
+      current_lock_type_(0) {
+  if (FAILED(category_manager_.CreateInstance(CLSID_TF_CategoryMgr))) {
+    LOG(FATAL) << "Failed to initialize CategoryMgr.";
+    return;
+  }
+  if (FAILED(display_attribute_manager_.CreateInstance(
+          CLSID_TF_DisplayAttributeMgr))) {
+    LOG(FATAL) << "Failed to initialize DisplayAttributeMgr.";
+    return;
+  }
 }
 
 TsfTextStore::~TsfTextStore() {
 }
 
 ULONG STDMETHODCALLTYPE TsfTextStore::AddRef() {
   return InterlockedIncrement(&ref_count_);
 }
 
 ULONG STDMETHODCALLTYPE TsfTextStore::Release() {
@@ skipping 41 matching lines @@
 
 STDMETHODIMP TsfTextStore::FindNextAttrTransition(
     LONG acp_start,
     LONG acp_halt,
     ULONG num_filter_attributes,
     const TS_ATTRID* filter_attributes,
     DWORD flags,
     LONG* acp_next,
     BOOL* found,
     LONG* found_offset) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  if (!acp_next || !found || !found_offset)
+    return E_INVALIDARG;
+  // We don't support FindNextAttrTransition.
+  *acp_next = 0;
+  *found = FALSE;
+  *found_offset = 0;
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::GetACPFromPoint(
     TsViewCookie view_cookie,
     const POINT* point,
     DWORD flags,
     LONG* acp) {
+  // We don't support GetACPFromPoint.
   NOTIMPLEMENTED();
   return E_NOTIMPL;
 }
 
 STDMETHODIMP TsfTextStore::GetActiveView(TsViewCookie* view_cookie) {
-  NOTIMPLEMENTED();
   if (!view_cookie)
     return E_INVALIDARG;
+  // We support only one view.
+  *view_cookie = kViewCookie;
   return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::GetEmbedded(LONG acp_pos,
                                        REFGUID service,
                                        REFIID iid,
                                        IUnknown** unknown) {
+  // We don't support any embedded objects.
   NOTIMPLEMENTED();
   if (!unknown)
     return E_INVALIDARG;
   *unknown = NULL;
   return E_NOTIMPL;
 }
 
 STDMETHODIMP TsfTextStore::GetEndACP(LONG* acp) {
-  NOTIMPLEMENTED();
   if (!acp)
     return E_INVALIDARG;
-  return E_NOTIMPL;
+  if (!HasReadLock())
+    return TS_E_NOLOCK;
+  *acp = string_buffer_.size();
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::GetFormattedText(LONG acp_start, LONG acp_end,
                                             IDataObject** data_object) {
+  // We don't support GetFormattedText.
   NOTIMPLEMENTED();
   return E_NOTIMPL;
 }
 
 STDMETHODIMP TsfTextStore::GetScreenExt(TsViewCookie view_cookie, RECT* rect) {
   NOTIMPLEMENTED();
   if (!rect)
     return E_INVALIDARG;
   SetRect(rect, 0, 0, 0, 0);
   return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::GetSelection(ULONG selection_index,
                                         ULONG selection_buffer_size,
                                         TS_SELECTION_ACP* selection_buffer,
                                         ULONG* fetched_count) {
-  NOTIMPLEMENTED();
   if (!selection_buffer)
     return E_INVALIDARG;
   if (!fetched_count)
     return E_INVALIDARG;
-  return E_NOTIMPL;
+  if (!HasReadLock())
+    return TS_E_NOLOCK;
+  *fetched_count = 0;
+  if ((selection_buffer_size > 0) &&
+      ((selection_index == 0) || (selection_index == TS_DEFAULT_SELECTION))) {
+    selection_buffer[0].acpStart = selection_.start();
+    selection_buffer[0].acpEnd = selection_.end();
+    selection_buffer[0].style.ase = TS_AE_END;
+    selection_buffer[0].style.fInterimChar = FALSE;
+    *fetched_count = 1;
+  }
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::GetStatus(TS_STATUS* status) {
-  NOTIMPLEMENTED();
   if (!status)
     return E_INVALIDARG;
-  return E_NOTIMPL;
+
+  status->dwDynamicFlags = 0;
+  status->dwStaticFlags = TS_SS_NOHIDDENTEXT;
+
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::GetText(LONG acp_start,
                                    LONG acp_end,
                                    wchar_t* text_buffer,
                                    ULONG text_buffer_size,
                                    ULONG* text_buffer_copied,
                                    TS_RUNINFO* run_info_buffer,
                                    ULONG run_info_buffer_size,
                                    ULONG* run_info_buffer_copied,
                                    LONG* next_acp) {
-  NOTIMPLEMENTED();
   if (!text_buffer_copied || !run_info_buffer_copied)
     return E_INVALIDARG;
   if (!text_buffer && text_buffer_size != 0)
     return E_INVALIDARG;
   if (!run_info_buffer && run_info_buffer_size != 0)
     return E_INVALIDARG;
-  return E_NOTIMPL;
+  if (!HasReadLock())
+    return TF_E_NOLOCK;
+  if (acp_end == -1)
+    acp_end = static_cast<LONG>(string_buffer_.size());
+  if ((acp_start > acp_end) ||
+      (acp_start > static_cast<LONG>(string_buffer_.size())) ||
+      (acp_end > static_cast<LONG>(string_buffer_.size()))) {
+    return TF_E_INVALIDPOS;
+  }
+
+  acp_end = std::min(acp_end, acp_start + static_cast<LONG>(text_buffer_size));
+  *text_buffer_copied = acp_end - acp_start;
+
+  const string16& result =
+      string_buffer_.substr(acp_start, *text_buffer_copied);
+  for (size_t i = 0; i < result.size(); ++i) {
+    text_buffer[i] = result[i];
+  }
+
+  if (run_info_buffer_size) {
+    run_info_buffer[0].uCount = *text_buffer_copied;
+    run_info_buffer[0].type = TS_RT_PLAIN;
+    *run_info_buffer_copied = 1;
+  }
+
+  *next_acp = acp_end;
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::GetTextExt(TsViewCookie view_cookie,
                                       LONG acp_start,
                                       LONG acp_end,
                                       RECT* rect,
                                       BOOL* clipped) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  if (!rect || !clipped)
+    return E_INVALIDARG;
+  if (!text_input_client_)
+    return E_UNEXPECTED;
+  if (view_cookie != kViewCookie)
+    return E_INVALIDARG;
+  if (!HasReadLock())
+    return TS_E_NOLOCK;
+  if (acp_start < static_cast<LONG>(committed_size_))
+    return TS_E_INVALIDPOS;
+  if (acp_end < acp_start)
+    return E_INVALIDARG;
+
+  gfx::Rect result;
+  gfx::Rect tmp_rect;
+  const uint32 start_pos = acp_start - committed_size_;
+  const uint32 end_pos = acp_end - committed_size_;
+
+  if (start_pos == end_pos) {
+    // According to MSDN document, if |acp_start| and |acp_end| are equal it is
+    // OK to just return TS_E_INVALIDARG.
+    // http://msdn.microsoft.com/en-us/library/ms538435
+    // But when using Pinin IME of Windows 8, this method is called with the
+    // equal values of |acp_start| and |acp_end|. So we handle this condition.
+    if (start_pos == 0) {
+      if (text_input_client_->GetCompositionCharacterBounds(0, &tmp_rect)) {
+        result = tmp_rect;
+        result.set_width(0);
+      } else if (string_buffer_.size() == committed_size_) {
+        result = text_input_client_->GetCaretBounds();
+      } else {
+        return TS_E_NOLAYOUT;
+      }
+    } else if (text_input_client_->GetCompositionCharacterBounds(start_pos - 1,
+                                                                 &tmp_rect)) {
+      result.set_x(tmp_rect.right());
+      result.set_y(tmp_rect.y());
+      result.set_width(0);
+      result.set_height(tmp_rect.height());
+    } else {
+      return TS_E_NOLAYOUT;
+    }
+  } else {
+    if (!text_input_client_->GetCompositionCharacterBounds(start_pos, &result))
+      return TS_E_NOLAYOUT;
+
+    for (uint32 i = start_pos + 1; i < end_pos; ++i) {
+      if (!text_input_client_->GetCompositionCharacterBounds(i, &tmp_rect))
+        return TS_E_NOLAYOUT;
+      result = result.Union(tmp_rect);
+    }
+  }
+
+  *rect =  result.ToRECT();
+  *clipped = FALSE;
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::GetWnd(TsViewCookie view_cookie,
                                   HWND* window_handle) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  if (!window_handle)
+    return E_INVALIDARG;
+  if (view_cookie != kViewCookie)
+    return E_INVALIDARG;
+  *window_handle = window_handle_;
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::InsertEmbedded(DWORD flags,
                                           LONG acp_start,
                                           LONG acp_end,
                                           IDataObject* data_object,
                                           TS_TEXTCHANGE* change) {
+  // We don't support any embedded objects.
   NOTIMPLEMENTED();
   return E_NOTIMPL;
 }
 
 STDMETHODIMP TsfTextStore::InsertEmbeddedAtSelection(DWORD flags,
                                                      IDataObject* data_object,
                                                      LONG* acp_start,
                                                      LONG* acp_end,
                                                      TS_TEXTCHANGE* change) {
+  // We don't support any embedded objects.
   NOTIMPLEMENTED();
   return E_NOTIMPL;
 }
 
 STDMETHODIMP TsfTextStore::InsertTextAtSelection(DWORD flags,
                                                  const wchar_t* text_buffer,
                                                  ULONG text_buffer_size,
                                                  LONG* acp_start,
                                                  LONG* acp_end,
                                                  TS_TEXTCHANGE* text_change) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  const LONG start_pos = selection_.start();
+  const LONG end_pos = selection_.end();
+  const LONG new_end_pos = start_pos + text_buffer_size;
+
+  if (flags & TS_IAS_QUERYONLY) {
+    if (!HasReadLock())
+      return TS_E_NOLOCK;
+    if (acp_start)
+      *acp_start = start_pos;
+    if (acp_end) {
+      *acp_end = new_end_pos;
+    }
+    return S_OK;
+  }
+
+  if (!HasReadWriteLock())
+    return TS_E_NOLOCK;
+  if (!text_buffer)
+    return E_INVALIDARG;
+
+  DCHECK_LE(start_pos, end_pos);
+  string_buffer_ = string_buffer_.substr(0, start_pos) +
+                   string16(text_buffer, text_buffer + text_buffer_size) +
+                   string_buffer_.substr(end_pos);
+  if (acp_start)
+    *acp_start = start_pos;
+  if (acp_end)
+    *acp_end = new_end_pos;
+  if (text_change) {
+    text_change->acpStart = start_pos;
+    text_change->acpOldEnd = end_pos;
+    text_change->acpNewEnd = new_end_pos;
+  }
+  selection_.set_start(start_pos);
+  selection_.set_end(new_end_pos);
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::QueryInsert(
     LONG acp_test_start,
     LONG acp_test_end,
     ULONG text_size,
     LONG* acp_result_start,
     LONG* acp_result_end) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  if ((acp_test_end < acp_test_start) ||
+      (acp_test_start < static_cast<LONG>(committed_size_))) {
+    return E_FAIL;
+  }
+  if (acp_result_start)
+    *acp_result_start = acp_test_start;
+  if (acp_result_end)
+    *acp_result_end = acp_test_start + text_size;
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::QueryInsertEmbedded(const GUID* service,
                                                const FORMATETC* format,
                                                BOOL* insertable) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  // We don't support any embedded objects.
+  if (insertable)
+    *insertable = FALSE;
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::RequestAttrsAtPosition(
     LONG acp_pos,
     ULONG attribute_buffer_size,
     const TS_ATTRID* attribute_buffer,
     DWORD flags) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  // We don't support any document attributes.
+  // This method just returns S_OK, and the subsequently called
+  // RetrieveRequestedAttrs() returns 0 as the number of supported attributes.
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::RequestAttrsTransitioningAtPosition(
     LONG acp_pos,
     ULONG attribute_buffer_size,
     const TS_ATTRID* attribute_buffer,
     DWORD flags) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  // We don't support any document attributes.
+  // This method just returns S_OK, and the subsequently called
+  // RetrieveRequestedAttrs() returns 0 as the number of supported attributes.
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::RequestLock(DWORD lock_flags, HRESULT* result) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  if (!text_store_acp_sink_.get())
+    return E_FAIL;
+  if (!result)
+    return E_INVALIDARG;
+
+  if (current_lock_type_ != 0) {
+    if (lock_flags & TS_LF_SYNC) {
+      // Can't lock synchronously.
+      *result = TS_E_SYNCHRONOUS;
+      return S_OK;
+    }
+    // Queue the lock request.
+    lock_queue_.push_back(lock_flags & TS_LF_READWRITE);
+    *result = TS_S_ASYNC;
+    return S_OK;
+  }
+
+  // Lock
+  current_lock_type_ = (lock_flags & TS_LF_READWRITE);
+
+  edit_flag_ = false;
+  const size_t last_committed_size = committed_size_;
+
+  // Grant the lock.
+  *result = text_store_acp_sink_->OnLockGranted(current_lock_type_);
+
+  // Unlock
+  current_lock_type_ = 0;
+
+  // Handles the pending lock requests.
+  while (lock_queue_.size() > 0) {
+    current_lock_type_ = lock_queue_.front();
+    lock_queue_.pop_front();
+    text_store_acp_sink_->OnLockGranted(current_lock_type_);
+    current_lock_type_ = 0;
+  }
+
+  if (!edit_flag_) {
+    return S_OK;
+  }
+
+  // If the text store is edited in OnLockGranted(), we may need to call
+  // TextInputClient::InsertText() or TextInputClient::SetCompositionText().
+  const size_t new_committed_size = committed_size_;
+  const string16& new_committed_string =
+      string_buffer_.substr(last_committed_size,
+                            new_committed_size - last_committed_size);
+  const string16& composition_string =
+      string_buffer_.substr(new_committed_size);
+
+  // If there is new committed string, calls TextInputClient::InsertText().
+  if ((!new_committed_string.empty()) && text_input_client_) {
+    text_input_client_->InsertText(new_committed_string);
+  }
+
+  // Calls TextInputClient::SetCompositionText().
+  CompositionText composition_text;
+  composition_text.text = composition_string;
+  composition_text.underlines = composition_undelines_;
+  // Adjusts the offset.
+  for (size_t i = 0; i < composition_text.underlines.size(); ++i) {
+    composition_text.underlines[i].start_offset -= new_committed_size;
+    composition_text.underlines[i].end_offset -= new_committed_size;
+  }
+  if (selection_.start() < new_committed_size) {
+    composition_text.selection.set_start(0);
+  } else {
+    composition_text.selection.set_start(
+        selection_.start() - new_committed_size);
+  }
+  if (selection_.end() < new_committed_size) {
+    composition_text.selection.set_end(0);
+  } else {
+    composition_text.selection.set_end(selection_.end() - new_committed_size);
+  }
+  if (text_input_client_)
+    text_input_client_->SetCompositionText(composition_text);
+
+  // If there is no composition string, clear the text store status.
+  // And call OnSelectionChange(), OnLayoutChange(), and OnTextChange().
+  if ((composition_string.empty()) && (new_committed_size != 0)) {
+    string_buffer_.clear();
+    committed_size_ = 0;
+    selection_.set_start(0);
+    selection_.set_end(0);
+    if (text_store_acp_sink_mask_ & TS_AS_SEL_CHANGE)
+      text_store_acp_sink_->OnSelectionChange();
+    if (text_store_acp_sink_mask_ & TS_AS_LAYOUT_CHANGE)
+      text_store_acp_sink_->OnLayoutChange(TS_LC_CHANGE, 0);
+    if (text_store_acp_sink_mask_ & TS_AS_TEXT_CHANGE) {
+      TS_TEXTCHANGE textChange;
+      textChange.acpStart = 0;
+      textChange.acpOldEnd = new_committed_size;
+      textChange.acpNewEnd = 0;
+      text_store_acp_sink_->OnTextChange(0, &textChange);
+    }
+  }
+
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::RequestSupportedAttrs(
     DWORD flags,
     ULONG attribute_buffer_size,
     const TS_ATTRID* attribute_buffer) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  // We don't support any document attributes.
+  // This method just returns S_OK, and the subsequently called
+  // RetrieveRequestedAttrs() returns 0 as the number of supported attributes.
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::RetrieveRequestedAttrs(
     ULONG attribute_buffer_size,
     TS_ATTRVAL* attribute_buffer,
     ULONG* attribute_buffer_copied) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  if (attribute_buffer_copied == NULL)
+    return E_INVALIDARG;
+  // We don't support any document attributes.
+  attribute_buffer_copied = 0;
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::SetSelection(
     ULONG selection_buffer_size,
     const TS_SELECTION_ACP* selection_buffer) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  if (!HasReadWriteLock())
+    return TF_E_NOLOCK;
+  if (selection_buffer_size > 0) {
+    const LONG start_pos = selection_buffer[0].acpStart;
+    const LONG end_pos = selection_buffer[0].acpEnd;
+    if ((start_pos < static_cast<LONG>(committed_size_)) ||
+        (static_cast<LONG>(string_buffer_.size()) < start_pos) ||
+        (end_pos < start_pos) ||
+        (static_cast<LONG>(string_buffer_.size()) < end_pos)) {
+      return TF_E_INVALIDPOS;
+    }
+    selection_.set_start(start_pos);
+    selection_.set_end(end_pos);
+  }
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::SetText(DWORD flags,
                                    LONG acp_start,
                                    LONG acp_end,
                                    const wchar_t* text_buffer,
                                    ULONG text_buffer_size,
                                    TS_TEXTCHANGE* text_change) {
-  NOTIMPLEMENTED();
-  return E_NOTIMPL;
+  if (!HasReadWriteLock())
+    return TS_E_NOLOCK;
+  if (acp_start < static_cast<LONG>(committed_size_))
+    return TS_E_INVALIDPOS;
+  if (static_cast<LONG>(string_buffer_.size()) < acp_start)
+    return TS_E_INVALIDPOS;
+  if (acp_end < acp_start)
+    return E_INVALIDARG;
+  if (static_cast<LONG>(string_buffer_.size()) < acp_end)
+    return TS_E_INVALIDPOS;
+
+  TS_SELECTION_ACP selection;
+  selection.acpStart = acp_start;
+  selection.acpEnd = acp_end;
+  selection.style.ase = TS_AE_NONE;
+  selection.style.fInterimChar = 0;
+  if (SetSelection(1, &selection) != S_OK)
+    return E_UNEXPECTED;
+
+  TS_TEXTCHANGE change;
+  if (InsertTextAtSelection(0, text_buffer, text_buffer_size,
+                            &acp_start, &acp_end, &change) != S_OK) {
+    return E_UNEXPECTED;
+  }
+  if (text_change)
+    *text_change = change;
+
+  return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::UnadviseSink(IUnknown* unknown) {
   if (!text_store_acp_sink_.IsSameObject(unknown))
     return CONNECT_E_NOCONNECTION;
   text_store_acp_sink_.Release();
   text_store_acp_sink_mask_ = 0;
   return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::OnStartComposition(
     ITfCompositionView* composition_view,
     BOOL* ok) {
-  if (!ok)
+  if (ok)
     *ok = TRUE;
   return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::OnUpdateComposition(
     ITfCompositionView* composition_view,
     ITfRange* range) {
   return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::OnEndComposition(
     ITfCompositionView* composition_view) {
   return S_OK;
 }
 
 STDMETHODIMP TsfTextStore::OnEndEdit(ITfContext* context,
                                      TfEditCookie read_only_edit_cookie,
                                      ITfEditRecord* edit_record) {
+  if (!context || !edit_record)
+    return E_INVALIDARG;
+
+  size_t committed_size;
+  CompositionUnderlines undelines;
+  if (!GetCompositionStatus(context, read_only_edit_cookie, &committed_size,
+                            &undelines)) {
+    return S_OK;
+  }
+  composition_undelines_ = undelines;
+  committed_size_ = committed_size;
+  edit_flag_ = true;
   return S_OK;
 }
 
-}  // namespace ui
+bool TsfTextStore::GetDisplayAttribute(TfGuidAtom guid_atom,
+                                       TF_DISPLAYATTRIBUTE* attribute) {
+  GUID guid;
+  if (FAILED(category_manager_->GetGUID(guid_atom, &guid)))
+    return false;
+
+  base::win::ScopedComPtr<ITfDisplayAttributeInfo> display_attribute_info;
+  if (FAILED(display_attribute_manager_->GetDisplayAttributeInfo(
+          guid, display_attribute_info.Receive(), NULL))) {
+    return false;
+  }
+  return SUCCEEDED(display_attribute_info->GetAttributeInfo(attribute));
+}
+
+bool TsfTextStore::GetCompositionStatus(
+    ITfContext* context,
+    const TfEditCookie read_only_edit_cookie,
+    size_t* committed_size,
+    CompositionUnderlines* undelines) {
+  DCHECK(context);
+  DCHECK(committed_size);
+  DCHECK(undelines);
+  const GUID* rgGuids[2] = {&GUID_PROP_COMPOSING, &GUID_PROP_ATTRIBUTE};
+  base::win::ScopedComPtr<ITfReadOnlyProperty> track_property;
+  if (FAILED(context->TrackProperties(rgGuids, 2, NULL, 0,
+                                      track_property.Receive()))) {
+    return false;
+  }
+
+  *committed_size = 0;
+  undelines->clear();
+  base::win::ScopedComPtr<ITfRange> start_to_end_range;
+  base::win::ScopedComPtr<ITfRange> end_range;
+  if (FAILED(context->GetStart(read_only_edit_cookie,
+                               start_to_end_range.Receive()))) {
+    return false;
+  }
+  if (FAILED(context->GetEnd(read_only_edit_cookie, end_range.Receive())))
+    return false;
+  if (FAILED(start_to_end_range->ShiftEndToRange(read_only_edit_cookie,
+                                                 end_range, TF_ANCHOR_END))) {
+    return false;
+  }
+
+  base::win::ScopedComPtr<IEnumTfRanges> ranges;
+  if (FAILED(track_property->EnumRanges(read_only_edit_cookie, ranges.Receive(),
+                                        start_to_end_range))) {
+    return false;
+  }
+
+  while (true) {
+    base::win::ScopedComPtr<ITfRange> range;
+    if (ranges->Next(1, range.Receive(), NULL) != S_OK)
+      break;
+    base::win::ScopedVariant value;
+    base::win::ScopedComPtr<IEnumTfPropertyValue> enum_prop_value;
+    if (FAILED(track_property->GetValue(read_only_edit_cookie, range,
+                                        value.Receive()))) {
+      return false;
+    }
+    if (FAILED(enum_prop_value.QueryFrom(value.AsInput()->punkVal)))
+      return false;
+
+    TF_PROPERTYVAL property_value;
+    bool is_composition = false;
+    bool has_display_attribute = false;
+    TF_DISPLAYATTRIBUTE display_attribute;
+    while (enum_prop_value->Next(1, &property_value, NULL) == S_OK) {
+      if (IsEqualGUID(property_value.guidId, GUID_PROP_COMPOSING)) {
+        is_composition = (property_value.varValue.lVal == TRUE);
+      } else if (IsEqualGUID(property_value.guidId, GUID_PROP_ATTRIBUTE)) {
+        TfGuidAtom guid_atom =
+            static_cast<TfGuidAtom>(property_value.varValue.lVal);
+        if (GetDisplayAttribute(guid_atom, &display_attribute))
+          has_display_attribute = true;
+      }
+      VariantClear(&property_value.varValue);
+    }
+
+    base::win::ScopedComPtr<ITfRangeACP> range_acp;
+    range_acp.QueryFrom(range);
+    LONG start_pos, length;
+    range_acp->GetExtent(&start_pos, &length);
+    if (!is_composition) {
+      if (*committed_size < static_cast<size_t>(start_pos + length))
+        *committed_size = start_pos + length;
+    } else {
+      CompositionUnderline underline;
+      underline.start_offset = start_pos;
+      underline.end_offset = start_pos + length;
+      underline.color = SK_ColorBLACK;
+      if (has_display_attribute)
+        underline.thick = !!display_attribute.fBoldLine;
+      undelines->push_back(underline);
+    }
+  }
+  return true;
+}
+
+void TsfTextStore::SetFocusedTextInputClient(
+    HWND focused_window,
+    TextInputClient* text_input_client) {
+  window_handle_ = focused_window;
+  text_input_client_ = text_input_client;
+}
+
+void TsfTextStore::RemoveFocusedTextInputClient(
+    TextInputClient* text_input_client) {
+  if (text_input_client_ == text_input_client) {
+    window_handle_ = NULL;
+    text_input_client_ = NULL;
+  }
+}
+
+void TsfTextStore::SendOnLayoutChange() {
+  if (text_store_acp_sink_ && (text_store_acp_sink_mask_ & TS_AS_LAYOUT_CHANGE))
+    text_store_acp_sink_->OnLayoutChange(TS_LC_CHANGE, 0);
+}
+
+bool TsfTextStore::HasReadLock() const {
+  return (current_lock_type_ & TS_LF_READ) == TS_LF_READ;
+}
+
+bool TsfTextStore::HasReadWriteLock() const {
+  return (current_lock_type_ & TS_LF_READWRITE) == TS_LF_READWRITE;
+}
+
+}  // namespace ui