Give platform apps control over launcher right-click context menu.

chrome/browser/extensions/context_menu_matcher.h

+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_CONTEXT_MENU_MATCHER_H_
+#define CHROME_BROWSER_EXTENSIONS_CONTEXT_MENU_MATCHER_H_
+
+#include <map>
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "chrome/browser/extensions/menu_manager.h"
+#include "ui/base/models/simple_menu_model.h"
+
+class ExtensionContextMenuBrowserTest;
+class Profile;
+
+namespace extensions {
+
+// This class contains code that is shared between the various places where
+// context menu items added by the extension or app should be shown.
+class ContextMenuMatcher {
+ public:
+  static const size_t kMaxExtensionItemTitleLength;
+
+  // The |filter| will be called on possibly matching menu items, and its
+  // result is used to determine which items to actually append to the menu.
+  ContextMenuMatcher(Profile* profile,
+                     ui::SimpleMenuModel::Delegate* delegate,
+                     ui::SimpleMenuModel* menu_model,
+                     const base::Callback<bool(const MenuItem*)>& filter);
+
+  // This is a helper function to append items for one particular extension.
+  // The |index| parameter is used for assigning id's, and is incremented for
+  // each item actually added.
+  void AppendExtensionItems(const std::string& extension_id,
+                            const string16& selection_text,
+                            int* index);
+
+  void Clear();
+
+  bool IsCommandIdChecked(int command_id) const;
+  bool IsCommandIdEnabled(int command_id) const;
+  void ExecuteCommand(int command_id,
+    const content::ContextMenuParams& params);
+
+ private:
+  friend class ::ExtensionContextMenuBrowserTest;
+
+  MenuItem::List GetRelevantExtensionItems(
+      const MenuItem::List& items,
+      bool can_cross_incognito);
+
+  // Used for recursively adding submenus of extension items.
+  void RecursivelyAppendExtensionItems(
+    const MenuItem::List& items,
+    bool can_cross_incognito,
+    const string16& selection_text,
+    ui::SimpleMenuModel* menu_model,
+    int* index);
+
+  // Attempts to get an MenuItem given the id of a context menu item.
+  extensions::MenuItem* GetExtensionMenuItem(int id) const;
+
+  // This will set the icon on the most recently-added item in the menu_model_.
+  void SetExtensionIcon(const std::string& extension_id);
+
+  Profile* profile_;
+  ui::SimpleMenuModel* menu_model_;
+  ui::SimpleMenuModel::Delegate* delegate_;
+
+  base::Callback<bool(const MenuItem*)> filter_;
+
+  // Maps the id from a context menu item to the MenuItem's internal id.
+  std::map<int, extensions::MenuItem::Id> extension_item_map_;
+
+  // Keep track of and clean up menu models for submenus.
+  ScopedVector<ui::SimpleMenuModel> extension_menu_models_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContextMenuMatcher);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_CONTEXT_MENU_MATCHER_H_