Implement cancel() API on a Notification object so that script can cancel or ...

chrome/browser/notifications/balloon_collection.h

 // Copyright (c) 2009 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.
 
 // Handles the visible notification (or balloons).
 
 #ifndef CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_H_
 #define CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_H_
 
 #include <deque>
 
 #include "base/gfx/point.h"
 #include "base/gfx/rect.h"
 #include "base/gfx/size.h"
 #include "chrome/browser/notifications/balloon.h"
 #include "chrome/browser/notifications/notification.h"
 
 class Balloon;
 class Profile;
 
 class BalloonCollection {
  public:
   virtual ~BalloonCollection() {}
 
   // Adds a new balloon for the specified notification.
   virtual void Add(const Notification& notification,
                    Profile* profile) = 0;
 
+  // Removes a balloon from the collection if present.  Returns
+  // true if anything was removed.
+  virtual bool Remove(const Notification& notification) = 0;
+
   // Is there room to add another notification?
   virtual bool HasSpace() const = 0;
 };
 
 // A balloon collection represents a set of notification balloons being
 // shown on the screen.  It positions new notifications according to
 // a layout, and monitors for balloons being closed, which it reports
 // up to its parent, the notification UI manager.
 class BalloonCollectionImpl : public BalloonCollection,
                               public Balloon::BalloonCloseListener {
@@ skipping 13 matching lines @@
   BalloonSpaceChangeListener* space_change_listener() {
     return space_change_listener_;
   }
   void set_space_change_listener(BalloonSpaceChangeListener* listener) {
     space_change_listener_ = listener;
   }
 
   // BalloonCollectionInterface overrides
   virtual void Add(const Notification& notification,
                    Profile* profile);
+  virtual bool Remove(const Notification& notification);
   virtual bool HasSpace() const;
 
   // Balloon::BalloonCloseListener interface
   virtual void OnBalloonClosed(Balloon* source);
 
  protected:
   // Creates a new balloon. Overridable by unit tests.  The caller is
   // responsible for freeing the pointer returned.
   virtual Balloon* MakeBalloon(const Notification& notification,
                                Profile* profile);
@@ skipping 70 matching lines @@
   typedef std::deque<Balloon*> Balloons;
   Balloons balloons_;
 
   // The layout parameters for balloons in this collection.
   Layout layout_;
 
   DISALLOW_COPY_AND_ASSIGN(BalloonCollectionImpl);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_H_