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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_INPUT_MONITOR_RAW_INPUT_HANDLER_H_
#define REMOTING_HOST_INPUT_MONITOR_RAW_INPUT_HANDLER_H_
#include <windows.h>
#include <cstdint>
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_pump_type.h"
#include "base/observer_list_threadsafe.h"
#include "base/threading/sequence_bound.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
#include "ui/events/event.h"
namespace base {
class SingleThreadTaskRunner;
} // namespace base
namespace remoting {
// This interface provides the per-input type logic for registering and
// receiving raw input for the underlying input mode. Note that only one HWND
// per process can register for RawInput events so subclasses must ensure they
// do not register for the same event types.
class RawInputHandler {
public:
class Observer : base::CheckedObserver {
public:
virtual void OnMouseMove(const webrtc::DesktopVector&, ui::EventType) = 0;
virtual void OnKeyboardInput(std::uint32_t usb_keycode) = 0;
virtual void OnError() = 0;
protected:
Observer() = default;
~Observer() override = default;
};
using ObserverList = base::ObserverListThreadSafe<
Observer,
base::RemoveObserverPolicy::kAddingSequenceOnly>;
RawInputHandler(scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
std::uint16_t hid_usage);
virtual ~RawInputHandler();
// AddObserver()/RemoveObserver() are thread safe however `RemoveObserver()`
// must be called on the same sequence that was used for `AddObserver()`.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
protected:
// Called for each raw input event.
virtual void OnInputEvent(const RAWINPUT& event) = 0;
// Notify observers when an event has been processed or an error has occurred.
void NotifyMouseMove(const base::Location& from_here,
const webrtc::DesktopVector&);
void NotifyKeyboardInput(const base::Location& from_here,
std::uint32_t usb_keycode);
void NotifyError(const base::Location& from_here);
private:
void StartListening();
void StopListening();
class Core;
base::SequenceBound<Core> core_;
// Observers are bound to the sequence they registered on meaning they are
// notified on that sequence and must unregister from that sequence as well.
const scoped_refptr<ObserverList> observer_list_ =
base::MakeRefCounted<ObserverList>(
base::ObserverListPolicy::EXISTING_ONLY);
base::WeakPtrFactory<RawInputHandler> weak_factory_{this};
};
} // namespace remoting
#endif // REMOTING_HOST_INPUT_MONITOR_RAW_INPUT_HANDLER_H_
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