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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_MUS_SERVER_VIEW_DRAWN_TRACKER_OBSERVER_H_
#define COMPONENTS_MUS_SERVER_VIEW_DRAWN_TRACKER_OBSERVER_H_
namespace mus {
class ServerView;
class ServerViewDrawnTrackerObserver {
public:
// Invoked when the drawn state changes. If |is_drawn| is false |ancestor|
// identifies where the change occurred. In the case of a remove |ancestor| is
// the parent of the view that was removed. In the case of a visibility change
// |ancestor| is the parent of the view whose visibility changed.
virtual void OnDrawnStateChanged(ServerView* ancestor,
ServerView* view,
bool is_drawn) {}
protected:
virtual ~ServerViewDrawnTrackerObserver() {}
};
} // namespace mus
#endif // COMPONENTS_MUS_SERVER_VIEW_DRAWN_TRACKER_OBSERVER_H_
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