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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 REMOTING_HOST_REMOTE_INPUT_FILTER_H_
#define REMOTING_HOST_REMOTE_INPUT_FILTER_H_
#include <list>
#include "base/compiler_specific.h"
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "remoting/protocol/input_event_tracker.h"
#include "remoting/protocol/input_stub.h"
#include "ui/events/event.h"
namespace remoting {
// Filtering InputStub that filters remotely-injected input if it has been
// notified of local input recently.
class RemoteInputFilter : public protocol::InputStub {
public:
// Creates a filter which forwards events to the specified InputEventTracker.
// The filter needs a tracker to release buttons & keys when blocking input.
explicit RemoteInputFilter(protocol::InputEventTracker* event_tracker);
RemoteInputFilter(const RemoteInputFilter&) = delete;
RemoteInputFilter& operator=(const RemoteInputFilter&) = delete;
~RemoteInputFilter() override;
// Informs the filter that local mouse or touch activity has been detected.
// If the activity does not match events we injected then we assume that it
// is local, and block remote input for a short while. Returns true if the
// input was local, or false if it was rejected as an echo.
bool LocalPointerMoved(const webrtc::DesktopVector& pos, ui::EventType type);
// Informs the filter that a local keypress event has been detected. If the
// key does not correspond to one we injected then we assume that it is local,
// and block remote input for a short while. Returns true if the input was
// local, or false if it was rejected as an echo.
bool LocalKeyPressed(uint32_t usb_keycode);
// Informs the filter that injecting input causes an echo.
void SetExpectLocalEcho(bool expect_local_echo);
// InputStub overrides.
void InjectKeyEvent(const protocol::KeyEvent& event) override;
void InjectTextEvent(const protocol::TextEvent& event) override;
void InjectMouseEvent(const protocol::MouseEvent& event) override;
void InjectTouchEvent(const protocol::TouchEvent& event) override;
private:
bool ShouldIgnoreInput() const;
void LocalInputDetected();
raw_ptr<protocol::InputEventTracker> event_tracker_;
// Queue of recently-injected mouse positions and keypresses used to
// distinguish echoes of injected events from movements from a local
// input device.
std::list<webrtc::DesktopVector> injected_mouse_positions_;
std::list<uint32_t> injected_key_presses_;
// Time at which local input events were most recently observed.
base::TimeTicks latest_local_input_time_;
// If |true| than the filter assumes that injecting input causes an echo.
bool expect_local_echo_;
};
} // namespace remoting
#endif // REMOTING_HOST_REMOTE_INPUT_FILTER_H_
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