Integrating Mac OS Grammar checker into Chromium.

chrome/renderer/spellchecker/spellcheck_provider.h

+// Copyright (c) 2010 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.
+
+#ifndef CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_PROVIDER_H_
+#define CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_PROVIDER_H_
+#pragma once
+
+#include <vector>
+
+#include "base/id_map.h"
+#include "chrome/renderer/render_view_observer.h"
+
+class RenderView;
+class SpellCheck;
+
+namespace WebKit {
+class WebString;
+class WebTextCheckingResult;
+class WebTextCheckingCompletion;
+}
+
+// This class deals with invoking browser-side spellcheck mechanism
+// which is done asynchronously.
+class SpellCheckProvider : public RenderViewObserver {

[Hironori Bono, 2011/02/18 11:09:27]

I'm a little wondering if this name describes the properties of this class well:
this class looks like a proxy than just a provider. I'm a little wondering if it
is good to denote a class derived from an observer as a provider.

+ public:
+  typedef IDMap<WebKit::WebTextCheckingCompletion> WebTextCheckCompletions;
+
+  SpellCheckProvider(RenderView* render_view, SpellCheck* spellcheck);
+  virtual ~SpellCheckProvider();
+
+  void RequestTextChecking(
+      const WebKit::WebString& text,
+      int document_tag,
+      WebKit::WebTextCheckingCompletion* completion);
+
+  void OnSpellCheckerRespondTextCheck(
+      int identifier,
+      int tag,
+      const std::vector<WebKit::WebTextCheckingResult>& results);
+
+  // Check the availability of the platform spellchecker.
+  // Makes this virtual for overriding on the unittest.
+  virtual bool is_using_platform_spelling_engine() const;
+
+  size_t pending_text_request_size() const {
+    return text_check_completions_.size();
+  }
+
+  // RenderViewObserver implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message);
+
+ private:
+  // Holds ongoing spellchecking operations, assigns IDs for the IPC routing.
+  WebTextCheckCompletions text_check_completions_;
+  // Spellcheck implementation for use. Weak reference.
+  SpellCheck* spellcheck_;
+
+  DISALLOW_COPY_AND_ASSIGN(SpellCheckProvider);
+};
+
+#endif  // CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_PROVIDER_H_