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// Copyright 2015 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 COMPONENTS_HTML_VIEWER_HTML_FRAME_TREE_MANAGER_OBSERVER_H_
#define COMPONENTS_HTML_VIEWER_HTML_FRAME_TREE_MANAGER_OBSERVER_H_
namespace html_viewer {
// Used to inform observers of interesting events to HTMLFrameTreeManager.
class HTMLFrameTreeManagerObserver {
public:
// The change_id of the HTMLFrameTreeManager has advanced. In other words,
// a structure change was done.
virtual void OnHTMLFrameTreeManagerChangeIdAdvanced() = 0;
// The HTMLFrameTreeManager was destroyed.
virtual void OnHTMLFrameTreeManagerDestroyed() = 0;
protected:
virtual ~HTMLFrameTreeManagerObserver() {}
};
} // namespace html_viewer
#endif // COMPONENTS_HTML_VIEWER_HTML_FRAME_TREE_MANAGER_OBSERVER_H_
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