blob: f489a8b3d0821fab5cb56c66d97777a4bba2f30c [file] [log] [blame]
// Copyright 2020 The Chromium OS 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 <linux/input.h>
#include <string>
#include <vector>
#include <base/files/scoped_file.h>
#include <xkbcommon/xkbcommon.h>
namespace key_reader {
constexpr int kMaxInputLength = 64;
// Increasing `kBackspaceSensitivity` will slow backspace speed.
constexpr int kBackspaceSensitivity = 2;
class KeyReader {
KeyReader(bool include_usb, bool print_length, std::string country_code)
: backspace_counter_(0),
country_code_(country_code) {
// Checks for valid keyboards and starts listening for input.
// Returns false if there are no valid devices.
bool KeyEventStart();
// Creates the correct keyboard layout for a given country code.
// Returns false for invalid keyboard layout, true otherwise.
bool SetKeyboardContext();
// Given a keycode, does all conversions for the layout including
// capitalization and special characters.
bool GetInput();
// GetChar takes in an input event and adds to user input if the key press
// is a valid, printable ASCII. Returns false on return, true otherwise.
bool GetChar(const struct input_event& ev);
// Returns the input stored as a string. Used in unittests.
std::string GetUserInputForTest();
std::string user_input_;
// Counts and aggregates repeated backspace key events.
int backspace_counter_;
// Checks that enter key down was recorded before returning on key up.
bool return_pressed_;
// Outputs input length to stdout when true.
bool print_length_;
// Whether or not to include USB connections when scanning for events.
bool include_usb_;
// Keyboard layout for xkb common;
std::string country_code_;
// Stores open event connections.
std::vector<base::ScopedFD> fds_;
// XKB common keyboard layout members.
struct xkb_context* ctx_;
struct xkb_rule_names names_;
struct xkb_keymap* keymap_;
struct xkb_state* state_;
} // namespace key_reader