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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_USER_ACTIVITY_USER_ACTIVITY_OBSERVER_H_
#define UI_BASE_USER_ACTIVITY_USER_ACTIVITY_OBSERVER_H_
#include "base/component_export.h"
namespace ui {
class Event;
}
namespace ui {
// Interface for classes that want to be notified about user activity.
// Implementations should register themselves with UserActivityDetector.
class COMPONENT_EXPORT(UI_BASE) UserActivityObserver {
public:
UserActivityObserver(const UserActivityObserver&) = delete;
UserActivityObserver& operator=(const UserActivityObserver&) = delete;
// Invoked periodically while the user is active (i.e. generating input
// events). |event| is the event that triggered the notification; it may
// be NULL in some cases (e.g. testing, synthetic invocations or external user
// activities reported by Chrome extensions). The Imprivata extension reports
// external user activities (with NULL events) via the chrome.login API.
virtual void OnUserActivity(const ui::Event* event) = 0;
protected:
UserActivityObserver() {}
virtual ~UserActivityObserver() {}
};
} // namespace ui
#endif // UI_BASE_USER_ACTIVITY_USER_ACTIVITY_OBSERVER_H_
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