WIP: Ash IME support

win8/metro_driver/ime/text_store.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2013 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.
 
 #define INITGUID  // required for GUID_PROP_INPUTSCOPE
-#include "ui/base/ime/win/tsf_text_store.h"
+#include "win8/metro_driver/ime/text_store.h"
 
 #include <InputScope.h>
 #include <OleCtl.h>
 
 #include <algorithm>
 
 #include "base/win/scoped_variant.h"
-#include "ui/base/ime/text_input_client.h"
-#include "ui/base/ime/win/tsf_input_scope.h"
-#include "ui/gfx/rect.h"
+#include "win8/metro_driver/ime/input_scope.h"
+#include "win8/metro_driver/ime/text_store_delegate.h"
 
-namespace ui {
+namespace metro_driver {
 namespace {
 
 // We support only one view.
 const TsViewCookie kViewCookie = 1;
 
 }  // namespace
 
-TSFTextStore::TSFTextStore()
+TextStore::TextStore(HWND window_handle,
+                     const std::vector<InputScope>& input_scopes,
+                     TextStoreDelegate* delegate)
     : ref_count_(0),
       text_store_acp_sink_mask_(0),
-      window_handle_(NULL),
-      text_input_client_(NULL),
+      window_handle_(window_handle),
+      delegate_(delegate),
       committed_size_(0),
+      selection_start_(0),
+      selection_end_(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;
   }
+  input_scope_ = CreteInputScope(input_scopes);
 }
 
-TSFTextStore::~TSFTextStore() {
+TextStore::~TextStore() {
 }
 
-ULONG STDMETHODCALLTYPE TSFTextStore::AddRef() {
+ULONG STDMETHODCALLTYPE TextStore::AddRef() {
   return InterlockedIncrement(&ref_count_);
 }
 
-ULONG STDMETHODCALLTYPE TSFTextStore::Release() {
+ULONG STDMETHODCALLTYPE TextStore::Release() {
   const LONG count = InterlockedDecrement(&ref_count_);
   if (!count) {
     delete this;
     return 0;
   }
   return static_cast<ULONG>(count);
 }
 
-STDMETHODIMP TSFTextStore::QueryInterface(REFIID iid, void** result) {
+STDMETHODIMP TextStore::QueryInterface(REFIID iid, void** result) {
   if (iid == IID_IUnknown || iid == IID_ITextStoreACP) {
     *result = static_cast<ITextStoreACP*>(this);
   } else if (iid == IID_ITfContextOwnerCompositionSink) {
     *result = static_cast<ITfContextOwnerCompositionSink*>(this);
   } else if (iid == IID_ITfTextEditSink) {
     *result = static_cast<ITfTextEditSink*>(this);
   } else {
     *result = NULL;
     return E_NOINTERFACE;
   }
   AddRef();
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::AdviseSink(REFIID iid,
-                                      IUnknown* unknown,
-                                      DWORD mask) {
+STDMETHODIMP TextStore::AdviseSink(REFIID iid,
+                                   IUnknown* unknown,
+                                   DWORD mask) {
   if (!IsEqualGUID(iid, IID_ITextStoreACPSink))
     return E_INVALIDARG;
   if (text_store_acp_sink_) {
     if (text_store_acp_sink_.IsSameObject(unknown)) {
       text_store_acp_sink_mask_ = mask;
       return S_OK;
     } else {
       return CONNECT_E_ADVISELIMIT;
     }
   }
   if (FAILED(text_store_acp_sink_.QueryFrom(unknown)))
     return E_UNEXPECTED;
   text_store_acp_sink_mask_ = mask;
 
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::FindNextAttrTransition(
+STDMETHODIMP TextStore::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) {
   if (!acp_next || !found || !found_offset)
     return E_INVALIDARG;
   // We don't support any attributes.
   // So we always return "not found".
   *acp_next = 0;
   *found = FALSE;
   *found_offset = 0;
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::GetACPFromPoint(TsViewCookie view_cookie,
-                                           const POINT* point,
-                                           DWORD flags,
-                                           LONG* acp) {
+STDMETHODIMP TextStore::GetACPFromPoint(TsViewCookie view_cookie,
+                                        const POINT* point,
+                                        DWORD flags,
+                                        LONG* acp) {
   NOTIMPLEMENTED();
   if (view_cookie != kViewCookie)
     return E_INVALIDARG;
   return E_NOTIMPL;
 }
 
-STDMETHODIMP TSFTextStore::GetActiveView(TsViewCookie* view_cookie) {
+STDMETHODIMP TextStore::GetActiveView(TsViewCookie* view_cookie) {
   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) {
+STDMETHODIMP TextStore::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) {
+STDMETHODIMP TextStore::GetEndACP(LONG* acp) {
   if (!acp)
     return E_INVALIDARG;
   if (!HasReadLock())
     return TS_E_NOLOCK;
   *acp = string_buffer_.size();
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::GetFormattedText(LONG acp_start, LONG acp_end,
+STDMETHODIMP TextStore::GetFormattedText(LONG acp_start, LONG acp_end,
                                             IDataObject** data_object) {
   NOTIMPLEMENTED();
   return E_NOTIMPL;
 }
 
-STDMETHODIMP TSFTextStore::GetScreenExt(TsViewCookie view_cookie, RECT* rect) {
+STDMETHODIMP TextStore::GetScreenExt(TsViewCookie view_cookie, RECT* rect) {
   if (view_cookie != kViewCookie)
     return E_INVALIDARG;
   if (!rect)
     return E_INVALIDARG;
 
   // {0, 0, 0, 0} means that the document rect is not currently displayed.
   SetRect(rect, 0, 0, 0, 0);
 
-  if (!IsWindow(window_handle_))
-    return E_FAIL;
-
-  // Currently ui::TextInputClient does not expose the document rect. So use
-  // the Win32 client rectangle instead.
-  // TODO(yukawa): Upgrade TextInputClient so that the client can retrieve the
-  // document rectangle.
   RECT client_rect = {};
   if (!GetClientRect(window_handle_, &client_rect))
     return E_FAIL;
   POINT left_top = {client_rect.left, client_rect.top};
   POINT right_bottom = {client_rect.right, client_rect.bottom};
   if (!ClientToScreen(window_handle_, &left_top))
     return E_FAIL;
   if (!ClientToScreen(window_handle_, &right_bottom))
     return E_FAIL;
 
   rect->left = left_top.x;
   rect->top = left_top.y;
   rect->right = right_bottom.x;
   rect->bottom = right_bottom.y;
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::GetSelection(ULONG selection_index,
-                                        ULONG selection_buffer_size,
-                                        TS_SELECTION_ACP* selection_buffer,
-                                        ULONG* fetched_count) {
+STDMETHODIMP TextStore::GetSelection(ULONG selection_index,
+                                     ULONG selection_buffer_size,
+                                     TS_SELECTION_ACP* selection_buffer,
+                                     ULONG* fetched_count) {
   if (!selection_buffer)
     return E_INVALIDARG;
   if (!fetched_count)
     return E_INVALIDARG;
   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].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) {
+STDMETHODIMP TextStore::GetStatus(TS_STATUS* status) {
   if (!status)
     return E_INVALIDARG;
 
   status->dwDynamicFlags = 0;
   // We use transitory contexts and we don't support hidden text.
   status->dwStaticFlags = TS_SS_TRANSITORY | 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) {
+STDMETHODIMP TextStore::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) {
   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;
   if (!next_acp)
     return E_INVALIDARG;
   if (!HasReadLock())
     return TF_E_NOLOCK;
@@ skipping 17 matching lines @@
   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) {
+STDMETHODIMP TextStore::GetTextExt(TsViewCookie view_cookie,
+                                   LONG acp_start,
+                                   LONG acp_end,
+                                   RECT* rect,
+                                   BOOL* clipped) {
   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 (!((static_cast<LONG>(committed_size_) <= acp_start) &&
        (acp_start <= acp_end) &&
        (acp_end <= static_cast<LONG>(string_buffer_.size())))) {
     return TS_E_INVALIDPOS;
   }
 
   // According to a behavior of notepad.exe and wordpad.exe, top left corner of
   // rect indicates a first character's one, and bottom right corner of rect
   // indicates a last character's one.
   // We use RECT instead of gfx::Rect since left position may be bigger than
   // right position when composition has multiple lines.
-  RECT result;
-  gfx::Rect tmp_rect;
+  RECT result = {};
+  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 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)) {
-        tmp_rect.set_width(0);
-        result = tmp_rect.ToRECT();
+      if (delegate_->GetCompositionCharacterBounds(0, &tmp_rect)) {
+        tmp_rect.right = tmp_rect.right;
+        result = tmp_rect;
       } else if (string_buffer_.size() == committed_size_) {
-        result = text_input_client_->GetCaretBounds().ToRECT();
+        result = delegate_->GetCaretBounds();
       } else {
         return TS_E_NOLAYOUT;
       }
-    } else if (text_input_client_->GetCompositionCharacterBounds(start_pos - 1,
-                                                                 &tmp_rect)) {
-      result.left = tmp_rect.right();
-      result.right = tmp_rect.right();
-      result.top = tmp_rect.y();
-      result.bottom = tmp_rect.bottom();
+    } else if (delegate_->GetCompositionCharacterBounds(start_pos - 1,
+                                                        &tmp_rect)) {
+      tmp_rect.left = tmp_rect.right;
+      result = tmp_rect;
     } else {
       return TS_E_NOLAYOUT;
     }
   } else {
-    if (text_input_client_->GetCompositionCharacterBounds(start_pos,
-                                                          &tmp_rect)) {
-      result.left = tmp_rect.x();
-      result.top = tmp_rect.y();
-      result.right = tmp_rect.right();
-      result.bottom = tmp_rect.bottom();
-      if (text_input_client_->GetCompositionCharacterBounds(end_pos - 1,
-                                                            &tmp_rect)) {
-        result.right = tmp_rect.right();
-        result.bottom = tmp_rect.bottom();
+    if (delegate_->GetCompositionCharacterBounds(start_pos, &tmp_rect)) {
+      result = tmp_rect;
+      if (delegate_->GetCompositionCharacterBounds(end_pos - 1, &tmp_rect)) {
+        result.right = tmp_rect.right;
+        result.bottom = tmp_rect.bottom;
       } else {
         // We may not be able to get the last character bounds, so we use the
         // first character bounds instead of returning TS_E_NOLAYOUT.
       }
     } else {
       // Hack for PPAPI flash. PPAPI flash does not support GetCaretBounds, so
       // it's better to return previous caret rectangle instead.
       // TODO(nona, kinaba): Remove this hack.
       if (start_pos == 0) {
-        result = text_input_client_->GetCaretBounds().ToRECT();
+        result = delegate_->GetCaretBounds();
       } else {
         return TS_E_NOLAYOUT;
       }
     }
   }
 
   *rect =  result;
   *clipped = FALSE;
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::GetWnd(TsViewCookie view_cookie,
+STDMETHODIMP TextStore::GetWnd(TsViewCookie view_cookie,
                                   HWND* window_handle) {
   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,
+STDMETHODIMP TextStore::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,
+STDMETHODIMP TextStore::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,
+STDMETHODIMP TextStore::InsertTextAtSelection(DWORD flags,
                                                  const wchar_t* text_buffer,
                                                  ULONG text_buffer_size,
                                                  LONG* acp_start,
                                                  LONG* acp_end,
                                                  TS_TEXTCHANGE* text_change) {
-  const LONG start_pos = selection_.start();
-  const LONG end_pos = selection_.end();
+  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) {
+    if (acp_end)
       *acp_end = 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);
+  selection_start_ = start_pos;
+  selection_end_ = new_end_pos;
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::QueryInsert(
+STDMETHODIMP TextStore::QueryInsert(
     LONG acp_test_start,
     LONG acp_test_end,
     ULONG text_size,
     LONG* acp_result_start,
     LONG* acp_result_end) {
   if (!acp_result_start || !acp_result_end || acp_test_start > acp_test_end)
     return E_INVALIDARG;
   const LONG committed_size = static_cast<LONG>(committed_size_);
   const LONG buffer_size = static_cast<LONG>(string_buffer_.size());
   *acp_result_start = std::min(std::max(committed_size, acp_test_start),
                                buffer_size);
   *acp_result_end = std::min(std::max(committed_size, acp_test_end),
                              buffer_size);
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::QueryInsertEmbedded(const GUID* service,
+STDMETHODIMP TextStore::QueryInsertEmbedded(const GUID* service,
                                                const FORMATETC* format,
                                                BOOL* insertable) {
   if (!format)
     return E_INVALIDARG;
   // We don't support any embedded objects.
   if (insertable)
     *insertable = FALSE;
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::RequestAttrsAtPosition(
+STDMETHODIMP TextStore::RequestAttrsAtPosition(
     LONG acp_pos,
     ULONG attribute_buffer_size,
     const TS_ATTRID* attribute_buffer,
     DWORD flags) {
   // 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(
+STDMETHODIMP TextStore::RequestAttrsTransitioningAtPosition(
     LONG acp_pos,
     ULONG attribute_buffer_size,
     const TS_ATTRID* attribute_buffer,
     DWORD flags) {
   // 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) {
+STDMETHODIMP TextStore::RequestLock(DWORD lock_flags, HRESULT* result) {
   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;
@@ skipping 17 matching lines @@
   current_lock_type_ = 0;
 
   // Handles the pending lock requests.
   while (!lock_queue_.empty()) {
     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_) {
+  if (!edit_flag_)
     return S_OK;
-  }
 
   // If the text store is edited in OnLockGranted(), we may need to call
-  // TextInputClient::InsertText() or TextInputClient::SetCompositionText().
+  // TextStoreDelegate::ConfirmComposition() or
+  // TextStoreDelegate::SetComposition().
   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);
+  if (delegate_) {
+    // If there is new committed string, calls
+    // TextStoreDelegate::ConfirmComposition().
+    if ((!new_committed_string.empty()))
+      delegate_->OnTextCommitted(new_committed_string);
+
+    // Calls TextInputClient::SetCompositionText().
+    std::vector<metro_viewer::UnderlineInfo> underlines = underlines_;
+    // Adjusts the offset.
+    for (size_t i = 0; i < underlines_.size(); ++i) {
+      underlines[i].start_offset -= new_committed_size;
+      underlines[i].end_offset -= new_committed_size;
+    }
+    int32 selection_start = 0;
+    int32 selection_end = 0;
+    if (selection_start_ >= new_committed_size)
+      selection_start = selection_start_ - new_committed_size;
+    if (selection_end_ >= new_committed_size)
+      selection_end = selection_end_ - new_committed_size;
+    delegate_->OnCompositionChanged(
+          composition_string, selection_start, selection_end, underlines);
   }
 
-  // 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);
+    selection_start_ = 0;
+    selection_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;
+      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(
+STDMETHODIMP TextStore::RequestSupportedAttrs(
     DWORD /* flags */,  // Seems that we should ignore this.
     ULONG attribute_buffer_size,
     const TS_ATTRID* attribute_buffer) {
   if (!attribute_buffer)
     return E_INVALIDARG;
-  if (!text_input_client_)
+  if (!input_scope_)
     return E_FAIL;
   // We support only input scope attribute.
   for (size_t i = 0; i < attribute_buffer_size; ++i) {
     if (IsEqualGUID(GUID_PROP_INPUTSCOPE, attribute_buffer[i]))
       return S_OK;
   }
   return E_FAIL;
 }
 
-STDMETHODIMP TSFTextStore::RetrieveRequestedAttrs(
+STDMETHODIMP TextStore::RetrieveRequestedAttrs(
     ULONG attribute_buffer_size,
     TS_ATTRVAL* attribute_buffer,
     ULONG* attribute_buffer_copied) {
   if (!attribute_buffer_copied)
     return E_INVALIDARG;
+  *attribute_buffer_copied = 0;
   if (!attribute_buffer)
     return E_INVALIDARG;
-  if (!text_input_client_)
-    return E_UNEXPECTED;
+  if (!input_scope_)
+    return E_FAIL;
   // We support only input scope attribute.
-  *attribute_buffer_copied = 0;
   if (attribute_buffer_size == 0)
     return S_OK;
 
   attribute_buffer[0].dwOverlapId = 0;
   attribute_buffer[0].idAttr = GUID_PROP_INPUTSCOPE;
   attribute_buffer[0].varValue.vt = VT_UNKNOWN;
-  attribute_buffer[0].varValue.punkVal = tsf_inputscope::CreateInputScope(
-      text_input_client_->GetTextInputType(),
-      text_input_client_->GetTextInputMode());
+  attribute_buffer[0].varValue.punkVal = input_scope_;
   attribute_buffer[0].varValue.punkVal->AddRef();
   *attribute_buffer_copied = 1;
+
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::SetSelection(
+STDMETHODIMP TextStore::SetSelection(
     ULONG selection_buffer_size,
     const TS_SELECTION_ACP* selection_buffer) {
   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 (!((static_cast<LONG>(committed_size_) <= start_pos) &&
           (start_pos <= end_pos) &&
           (end_pos <= static_cast<LONG>(string_buffer_.size())))) {
       return TF_E_INVALIDPOS;
     }
-    selection_.set_start(start_pos);
-    selection_.set_end(end_pos);
+    selection_start_ = start_pos;
+    selection_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) {
+STDMETHODIMP TextStore::SetText(DWORD flags,
+                                LONG acp_start,
+                                LONG acp_end,
+                                const wchar_t* text_buffer,
+                                ULONG text_buffer_size,
+                                TS_TEXTCHANGE* text_change) {
   if (!HasReadWriteLock())
     return TS_E_NOLOCK;
   if (!((static_cast<LONG>(committed_size_) <= acp_start) &&
         (acp_start <= acp_end) &&
         (acp_end <= static_cast<LONG>(string_buffer_.size())))) {
     return TS_E_INVALIDPOS;
   }
 
-  TS_SELECTION_ACP selection;
+  TS_SELECTION_ACP selection = {};
   selection.acpStart = acp_start;
   selection.acpEnd = acp_end;
   selection.style.ase = TS_AE_NONE;
   selection.style.fInterimChar = 0;
 
-  HRESULT ret;
-  ret = SetSelection(1, &selection);
+  HRESULT ret = SetSelection(1, &selection);
   if (ret != S_OK)
     return ret;
 
   TS_TEXTCHANGE change;
-  ret = InsertTextAtSelection(0, text_buffer, text_buffer_size,
-                              &acp_start, &acp_end, &change);
+  ret = InsertTextAtSelection(
+      0, text_buffer, text_buffer_size, &acp_start, &acp_end, &change);
   if (ret != S_OK)
     return ret;
 
   if (text_change)
     *text_change = change;
 
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::UnadviseSink(IUnknown* unknown) {
+STDMETHODIMP TextStore::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(
+STDMETHODIMP TextStore::OnStartComposition(
     ITfCompositionView* composition_view,
     BOOL* ok) {
   if (ok)
     *ok = TRUE;
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::OnUpdateComposition(
+STDMETHODIMP TextStore::OnUpdateComposition(
     ITfCompositionView* composition_view,
     ITfRange* range) {
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::OnEndComposition(
+STDMETHODIMP TextStore::OnEndComposition(
     ITfCompositionView* composition_view) {
   return S_OK;
 }
 
-STDMETHODIMP TSFTextStore::OnEndEdit(ITfContext* context,
-                                     TfEditCookie read_only_edit_cookie,
-                                     ITfEditRecord* edit_record) {
+STDMETHODIMP TextStore::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)) {
+  if (!GetCompositionStatus(context, read_only_edit_cookie, &committed_size_,
+                            &underlines_)) {
+    // TODO(yukawa): Error handling.
     return S_OK;
   }
-  composition_undelines_ = undelines;
-  committed_size_ = committed_size;
   edit_flag_ = true;
   return S_OK;
 }
 
-bool TSFTextStore::GetDisplayAttribute(TfGuidAtom guid_atom,
-                                       TF_DISPLAYATTRIBUTE* attribute) {
+bool TextStore::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(
+bool TextStore::GetCompositionStatus(
     ITfContext* context,
     const TfEditCookie read_only_edit_cookie,
     size_t* committed_size,
-    CompositionUnderlines* undelines) {
+    std::vector<metro_viewer::UnderlineInfo>* undelines) {
   DCHECK(context);
   DCHECK(committed_size);
   DCHECK(undelines);
-  const GUID* rgGuids[2] = {&GUID_PROP_COMPOSING, &GUID_PROP_ATTRIBUTE};
+  const GUID* kTargetGuids[2] = {&GUID_PROP_COMPOSING, &GUID_PROP_ATTRIBUTE};
   base::win::ScopedComPtr<ITfReadOnlyProperty> track_property;
-  if (FAILED(context->TrackProperties(rgGuids, 2, NULL, 0,
+  if (FAILED(context->TrackProperties(kTargetGuids, 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()))) {
@@ skipping 18 matching lines @@
       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;
+    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;
+      metro_viewer::UnderlineInfo 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;
+      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;
-  }
-}
-
-bool TSFTextStore::CancelComposition() {
+bool TextStore::CancelComposition() {
   // If there is an on-going document lock, we must not edit the text.
   if (edit_flag_)
     return false;
 
   if (string_buffer_.empty())
     return true;
 
   // Unlike ImmNotifyIME(NI_COMPOSITIONSTR, CPS_CANCEL, 0) in IMM32, TSF does
   // not have a dedicated method to cancel composition. However, CUAS actually
   // has a protocol conversion from CPS_CANCEL into TSF operations. According
   // to the observations on Windows 7, TIPs are expected to cancel composition
   // when an on-going composition text is replaced with an empty string. So
   // we use the same operation to cancel composition here to minimize the risk
   // of potential compatibility issues.
 
   const size_t previous_buffer_size = string_buffer_.size();
   string_buffer_.clear();
   committed_size_ = 0;
-  selection_.set_start(0);
-  selection_.set_end(0);
+  selection_start_ = 0;
+  selection_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 = previous_buffer_size;
     textChange.acpNewEnd = 0;
     text_store_acp_sink_->OnTextChange(0, &textChange);
   }
   return true;
 }
 
-bool TSFTextStore::ConfirmComposition() {
+bool TextStore::ConfirmComposition() {
   // If there is an on-going document lock, we must not edit the text.
   if (edit_flag_)
     return false;
 
   if (string_buffer_.empty())
     return true;
 
-  // See the comment in TSFTextStore::CancelComposition.
+  // See the comment in TextStore::CancelComposition.
   // This logic is based on the observation about how to emulate
   // ImmNotifyIME(NI_COMPOSITIONSTR, CPS_COMPLETE, 0) by CUAS.
 
   const string16& composition_text = string_buffer_.substr(committed_size_);
   if (!composition_text.empty())
-    text_input_client_->InsertText(composition_text);
+    delegate_->OnTextCommitted(composition_text);
 
   const size_t previous_buffer_size = string_buffer_.size();
   string_buffer_.clear();
   committed_size_ = 0;
-  selection_.set_start(0);
-  selection_.set_end(0);
+  selection_start_ = 0;
+  selection_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 = previous_buffer_size;
     textChange.acpNewEnd = 0;
     text_store_acp_sink_->OnTextChange(0, &textChange);
   }
   return true;
 }
 
-void TSFTextStore::SendOnLayoutChange() {
+void TextStore::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 {
+bool TextStore::HasReadLock() const {
   return (current_lock_type_ & TS_LF_READ) == TS_LF_READ;
 }
 
-bool TSFTextStore::HasReadWriteLock() const {
+bool TextStore::HasReadWriteLock() const {
   return (current_lock_type_ & TS_LF_READWRITE) == TS_LF_READWRITE;
 }
 
-}  // namespace ui
+}  // namespace metro_driver