Refactor UI "badge" (page action) logic into a BadgeController interface.

chrome/browser/extensions/page_box_controller.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_PAGE_BOX_CONTROLLER_H_
+#define CHROME_BROWSER_EXTENSIONS_PAGE_BOX_CONTROLLER_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+
+class ExtensionAction;
+
+namespace extensions {
+
+// Controller of the "badges" (aka "page actions") in the UI.
+class PageBoxController {
+ public:
+  // UI decoration on a page box item.
+  enum Decoration {
+    DECORATION_NONE,
+  };
+
+  // Data about a UI badge.
+  struct Data {
+    // The type of decoration that should be applied to the badge.
+    Decoration decoration;
+
+    // The ExtensionAction that corresponds to the badge.
+    ExtensionAction* action;
+  };
+
+  // Mouse button type passed into OnClicked.
+  enum MouseButton {
+    MOUSE_LEFT,

[Evan Stade, 2012/05/14 19:24:07]

if you make this = 1, and the next = 2, etc., then conversion back to ints is
easier.

+    MOUSE_MIDDLE,
+    MOUSE_RIGHT,
+  };
+
+  typedef std::vector<Data> DataList;
+
+  // The reaction that the UI should take after executing |OnClicked|.
+  enum Action {
+    ACTION_NONE,
+    ACTION_SHOW_POPUP,
+    ACTION_SHOW_CONTEXT_MENU,
+  };
+
+  virtual ~PageBoxController() {}
+
+  // Gets the badge data for all extensions.
+  virtual scoped_ptr<DataList> GetAllBadgeData() = 0;
+
+  // Notifies this that the badge for an extension has been clicked with some
+  // mouse button (1 for left, 2 for middle, and 3 for right click), and
+  // returns the action that should be taken in response (if any).
+  virtual Action OnClicked(const std::string& extension_id,
+                           MouseButton button) = 0;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_PAGE_BOX_CONTROLLER_H_