Show composition window for IME-unaware PPAPI plugins on Windows.

ui/base/win/ime_input.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/ime_input.h"
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/string_util.h"
@@ skipping 105 matching lines @@
 
 }  // namespace
 
 namespace ui {
 
 ImeInput::ImeInput()
     : ime_status_(false),
       input_language_id_(LANG_USER_DEFAULT),
       is_composing_(false),
       system_caret_(false),
-      caret_rect_(-1, -1, 0, 0) {
+      caret_rect_(-1, -1, 0, 0),
+      use_composition_window_(false) {
 }
 
 ImeInput::~ImeInput() {
 }
 
 bool ImeInput::SetInputLanguage() {
   // Retrieve the current keyboard layout from Windows and determine whether
   // or not the current input context has IMEs.
   // Also save its input language for language-specific operations required
   // while composing a text.
@@ skipping 46 matching lines @@
   // Destroy the system caret if we have created for this IME input context.
   if (system_caret_) {
     ::DestroyCaret();
     system_caret_ = false;
   }
 }
 
 void ImeInput::MoveImeWindow(HWND window_handle, HIMC imm_context) {
   int x = caret_rect_.x();
   int y = caret_rect_.y();
+
   const int kCaretMargin = 1;
-  if (PRIMARYLANGID(input_language_id_) == LANG_CHINESE) {
+  if (!use_composition_window_ &&
+      PRIMARYLANGID(input_language_id_) == LANG_CHINESE) {
     // As written in a comment in ImeInput::CreateImeWindow(),
     // Chinese IMEs ignore function calls to ::ImmSetCandidateWindow()
     // when a user disables TSF (Text Service Framework) and CUAS (Cicero
     // Unaware Application Support).
     // On the other hand, when a user enables TSF and CUAS, Chinese IMEs
     // ignore the position of the current system caret and uses the
     // parameters given to ::ImmSetCandidateWindow() with its 'dwStyle'
     // parameter CFS_CANDIDATEPOS.
     // Therefore, we do not only call ::ImmSetCandidateWindow() but also
     // set the positions of the temporary system caret if it exists.
     CANDIDATEFORM candidate_position = {0, CFS_CANDIDATEPOS, {x, y},
                                         {0, 0, 0, 0}};
     ::ImmSetCandidateWindow(imm_context, &candidate_position);
   }
   if (system_caret_) {
     switch (PRIMARYLANGID(input_language_id_)) {
       case LANG_JAPANESE:
         ::SetCaretPos(x, y + caret_rect_.height());
         break;
       default:
         ::SetCaretPos(x, y);
         break;
     }
   }
+  if (use_composition_window_) {
+    // Moves the composition text window.
+    COMPOSITIONFORM cf = {CFS_POINT, {x, y}};
+    ::ImmSetCompositionWindow(imm_context, &cf);
+    // Don't need to set the position of candidate window.
+    return;
+  }
+
   if (PRIMARYLANGID(input_language_id_) == LANG_KOREAN) {
     // Chinese IMEs and Japanese IMEs require the upper-left corner of
     // the caret to move the position of their candidate windows.
     // On the other hand, Korean IMEs require the lower-left corner of the
     // caret to move their candidate windows.
     y += kCaretMargin;
   }
   // Japanese IMEs and Korean IMEs also use the rectangle given to
   // ::ImmSetCandidateWindow() with its 'dwStyle' parameter CFS_EXCLUDE
   // to move their candidate windows when a user disables TSF and CUAS.
@@ skipping 210 matching lines @@
     caret_rect_ = caret_rect;
     // Move the IME windows.
     HIMC imm_context = ::ImmGetContext(window_handle);
     if (imm_context) {
       MoveImeWindow(window_handle, imm_context);
       ::ImmReleaseContext(window_handle, imm_context);
     }
   }
 }
 
+void ImeInput::SetUseCompositionWindow(bool use_composition_window) {
+  use_composition_window_ = use_composition_window;
+}
+
 std::string ImeInput::GetInputLanguageName() const {
   const LCID locale_id = MAKELCID(input_language_id_, SORT_DEFAULT);
   // max size for LOCALE_SISO639LANGNAME and LOCALE_SISO3166CTRYNAME is 9.
   wchar_t buffer[9];
 
   // Get language id.
   int length = ::GetLocaleInfo(locale_id, LOCALE_SISO639LANGNAME, &buffer[0],
                                arraysize(buffer));
   if (length <= 1)
     return std::string();
@@ skipping 92 matching lines @@
   keystate[VK_RCONTROL] = 0;
   keystate[VK_LCONTROL] = 0;
   for (int i = 0; i <= VK_PACKET; ++i) {
     if (keystate[i] & kKeyDownMask)
       return false;
   }
   return true;
 }
 
 }  // namespace ui