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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_SYSTEM_POINTER_DEVICE_OBSERVER_H_
#define CHROME_BROWSER_ASH_SYSTEM_POINTER_DEVICE_OBSERVER_H_
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "ui/events/devices/input_device_event_observer.h"
namespace ash {
namespace system {
class PointerDeviceObserver : public ui::InputDeviceEventObserver {
public:
PointerDeviceObserver();
PointerDeviceObserver(const PointerDeviceObserver&) = delete;
PointerDeviceObserver& operator=(const PointerDeviceObserver&) = delete;
~PointerDeviceObserver() override;
// Start observing device hierarchy.
void Init();
// Check for presence of devices.
void CheckDevices();
class Observer {
public:
virtual void TouchpadExists(bool exists) = 0;
virtual void HapticTouchpadExists(bool exists) = 0;
virtual void MouseExists(bool exists) = 0;
virtual void PointingStickExists(bool exists) = 0;
protected:
Observer() = default;
virtual ~Observer();
};
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
private:
// InputDeviceEventObserver:
void OnInputDeviceConfigurationChanged(uint8_t input_device_types) override;
// Check for pointer devices.
void CheckTouchpadExists();
void CheckHapticTouchpadExists();
void CheckMouseExists();
void CheckPointingStickExists();
// Callback for pointer device checks.
void OnTouchpadExists(bool exists);
void OnHapticTouchpadExists(bool exists);
void OnMouseExists(bool exists);
void OnPointingStickExists(bool exists);
base::ObserverList<Observer>::Unchecked observers_;
base::WeakPtrFactory<PointerDeviceObserver> weak_factory_{this};
};
} // namespace system
} // namespace ash
#endif // CHROME_BROWSER_ASH_SYSTEM_POINTER_DEVICE_OBSERVER_H_
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