components/html_viewer/html_frame_tree_manager_observer.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_HTML_VIEWER_HTML_FRAME_TREE_MANAGER_OBSERVER_H_
   6 #define COMPONENTS_HTML_VIEWER_HTML_FRAME_TREE_MANAGER_OBSERVER_H_
   7
   8 namespace html_viewer {
   9
  10 // Used to inform observers of interesting events to HTMLFrameTreeManager.
  11 class HTMLFrameTreeManagerObserver {
  12  public:
  13   // The change_id of the HTMLFrameTreeManager has advanced. In other words,
  14   // a structure change was done.
  15   virtual void OnHTMLFrameTreeManagerChangeIdAdvanced() = 0;
  16
  17   // The HTMLFrameTreeManager was destroyed.
  18   virtual void OnHTMLFrameTreeManagerDestroyed() = 0;
  19
  20  protected:
  21   virtual ~HTMLFrameTreeManagerObserver() {}
  22 };
  23
  24 }  // namespace html_viewer
  25
  26 #endif  // COMPONENTS_HTML_VIEWER_HTML_FRAME_TREE_MANAGER_OBSERVER_H_