Separate out logic to handle different category/group of context menu items from RVContextMenu class

chrome/browser/tab_contents/menu_context/menu_context.h

+// Copyright 2014 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_BROWSER_TAB_CONTENTS_MENU_CONTEXT_MENU_CONTEXT_H_
+#define CHROME_BROWSER_TAB_CONTENTS_MENU_CONTEXT_MENU_CONTEXT_H_
+
+#include "chrome/browser/custom_handlers/protocol_handler_registry.h"
+#include "content/public/common/context_menu_params.h"
+#include "ui/base/models/simple_menu_model.h"
+
+class Profile;
+
+namespace content {
+class RenderFrameHost;
+class WebContents;
+}
+
+namespace extensions {
+class Extension;
+}
+
+// MenuContext is a helper to decide which category/group of items are
+// relevant for a given RenderFrameHost and a context.
+//
+// Subclasses can override the behavior of showing/hiding a category.
+class MenuContext {
+ public:
+  virtual ~MenuContext();
+
+  // Represents a group of menu items.
+  // Order matters as they are appended in the enum order.
+  enum ItemGroup {
+    ITEM_GROUP_CUSTOM,
+    ITEM_GROUP_PAGE,
+    ITEM_GROUP_FRAME,
+    ITEM_GROUP_LINK,
+    ITEM_GROUP_MEDIA_IMAGE,
+    ITEM_GROUP_SEARCHWEBFORIMAGE,
+    ITEM_GROUP_MEDIA_VIDEO,
+    ITEM_GROUP_MEDIA_AUDIO,
+    ITEM_GROUP_MEDIA_PLUGIN,
+    ITEM_GROUP_MEDIA_FILE,
+    ITEM_GROUP_EDITABLE,
+    ITEM_GROUP_COPY,
+    ITEM_GROUP_SEARCH_PROVIDER,
+    ITEM_GROUP_PRINT,
+    ITEM_GROUP_ALL_EXTENSION,
+    ITEM_GROUP_CURRENT_EXTENSION,
+    ITEM_GROUP_DEVELOPER,
+    ITEM_GROUP_DEVTOOLS_UNPACKED_EXT,
+    ITEM_GROUP_PRINT_PREVIEW
+  };
+
+  static MenuContext* Create(content::WebContents* web_contents,
+                             content::RenderFrameHost* render_frame_host,
+                             const content::ContextMenuParams& params);
+
+  // Returns if |group| is enabled.
+  virtual bool SupportsGroup(int group);
+
+ protected:
+  MenuContext(content::RenderFrameHost* render_frame_host,
+              const content::ContextMenuParams& params);
+
+  const extensions::Extension* GetExtension() const;
+
+  content::ContextMenuParams params_;
+  content::WebContents* source_web_contents_;
+  Profile* profile_;
+  bool has_custom_items_;
+
+ private:
+  friend class MenuContextFactory;
+
+  bool HasCustomItems(const std::vector<content::MenuItem>& items) const;
+  void Initialize();
+  bool SupportsGroupInternal(int group);
+
+  DISALLOW_COPY_AND_ASSIGN(MenuContext);
+};
+
+#endif  // CHROME_BROWSER_TAB_CONTENTS_MENU_CONTEXT_MENU_CONTEXT_H_