Enable basic IME functionality under Ash on Windows

win8/metro_driver/ime/input_scope.cc

Index: win8/metro_driver/ime/input_scope.cc
diff --git a/win8/metro_driver/ime/input_scope.cc b/win8/metro_driver/ime/input_scope.cc
new file mode 100644
index 0000000000000000000000000000000000000000..77bda67b27ac4f1e4becffd101988841fbf6893a
--- /dev/null
+++ b/win8/metro_driver/ime/input_scope.cc
@@ -0,0 +1,82 @@
+// 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.
+
+#include "win8/metro_driver/ime/input_scope.h"
+
+#include <atlbase.h>
+#include <atlcom.h>
+
+#include "ui/base/win/atl_module.h"
+
+namespace metro_driver {
+namespace {
+
+// An implementation of ITfInputScope interface.
+// This implementation only covers ITfInputScope::GetInputScopes since built-in
+// on-screen keyboard on Windows 8+ changes its layout depending on the returned
+// value of this method.
+// Although other advanced features of ITfInputScope such as phase list or
+// regex support might be useful for IMEs or on-screen keyboards in future,
+// no IME seems to be utilizing such features as of Windows 8.1.
+class ATL_NO_VTABLE InputScopeImpl
+    : public CComObjectRootEx<CComMultiThreadModel>,
+      public ITfInputScope {
+ public:
+  InputScopeImpl() {}
+
+  BEGIN_COM_MAP(InputScopeImpl)
+    COM_INTERFACE_ENTRY(ITfInputScope)
+  END_COM_MAP()
+
+  void Initialize(const std::vector<InputScope>& input_scopes) {
+    input_scopes_ = input_scopes;
+  }
+
+ private:
+  // ITfInputScope overrides:
+  STDMETHOD(GetInputScopes)(InputScope** input_scopes, UINT* count) OVERRIDE {
+    if (!count || !input_scopes)
+      return E_INVALIDARG;
+    *input_scopes = static_cast<InputScope*>(
+        CoTaskMemAlloc(sizeof(InputScope) * input_scopes_.size()));
+    if (!input_scopes) {
+      *count = 0;
+      return E_OUTOFMEMORY;
+    }
+    std::copy(input_scopes_.begin(), input_scopes_.end(), *input_scopes);
+    *count = input_scopes_.size();
+    return S_OK;
+  }
+  STDMETHOD(GetPhrase)(BSTR** phrases, UINT* count) OVERRIDE {
+    return E_NOTIMPL;
+  }
+  STDMETHOD(GetRegularExpression)(BSTR* regexp) OVERRIDE {
+    return E_NOTIMPL;
+  }
+  STDMETHOD(GetSRGS)(BSTR* srgs) OVERRIDE {
+    return E_NOTIMPL;
+  }
+  STDMETHOD(GetXML)(BSTR* xml) OVERRIDE {
+    return E_NOTIMPL;
+  }
+
+  // Data which ITfInputScope::GetInputScopes should return.
+  std::vector<InputScope> input_scopes_;
+
+  DISALLOW_COPY_AND_ASSIGN(InputScopeImpl);
+};
+
+}  // namespace
+
+base::win::ScopedComPtr<ITfInputScope>
+CreteInputScope(const std::vector<InputScope>& input_scopes) {
+  ui::win::CreateATLModuleIfNeeded();
+  CComObject<InputScopeImpl>* object = NULL;
+  if (FAILED(CComObject<InputScopeImpl>::CreateInstance(&object)))
+    return base::win::ScopedComPtr<ITfInputScope>();
+  object->Initialize(input_scopes);
+  return base::win::ScopedComPtr<ITfInputScope>(object);
+}
+
+}  // namespace metro_driver