blob: 490adc4aec4b37d267218b34f982bf8f080dfbb9 [file] [log] [blame]
// 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.
#include "base/macros.h"
#include "remoting/proto/event.pb.h"
#include "remoting/protocol/input_filter.h"
namespace remoting {
// NormalizingInputFilterWin works around a quirk in Windows' handling of the
// AltGr key. When using a layout that treats RightAlt as AltGr, Windows
// generates the following for an AltGr keydown/keyup cycle:
// keydown LeftControl
// keydown RightAlt
// keyup LeftControl
// keyup RightAlt
// In a layout without AltGr the key will generate only RightAlt events.
// This filter captures LeftControl keydown events and defers them until
// some other event occurs; if the next event is a RightAlt keydown then
// the LeftControl is ignored and neither keydown nor keyup will be sent
// for it.
class NormalizingInputFilterWin : public protocol::InputFilter {
explicit NormalizingInputFilterWin(protocol::InputStub* input_stub);
~NormalizingInputFilterWin() override;
// InputFilter interface.
void InjectKeyEvent(const protocol::KeyEvent& event) override;
void InjectMouseEvent(const protocol::MouseEvent& event) override;
void ProcessKeyDown(const protocol::KeyEvent& event);
void ProcessKeyUp(const protocol::KeyEvent& event);
// Sends the |deferred_control_keydown_|, if any, and clears it.
void FlushDeferredKeydownEvent();
// Holds the keydown event for LeftControl immediately after it has been
// pressed, until we have determined whether it is part of AltGr.
protocol::KeyEvent deferred_control_keydown_;
// True if LeftControl is pressed and treated as LeftControl.
bool left_control_is_pressed_ = false;
// True if LeftControl is pressed as part of AltGr.
bool altgr_is_pressed_ = false;
} // namespace remoting