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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/String.h>
#include <LibCrypto/BigFraction/BigFraction.h>
#include <LibCrypto/BigInt/UnsignedBigInteger.h>
// This type implements number typing and
// displaying mechanics. It does not perform
// any arithmetic operations or anything on
// the values it deals with.
class Keypad final {
public:
Keypad() = default;
~Keypad() = default;
unsigned type_digit(int digit);
void type_decimal_point();
void type_backspace();
Crypto::BigFraction value() const;
void set_value(Crypto::BigFraction);
void set_to_0();
void set_rounding_length(unsigned);
unsigned rounding_length() const;
String to_string() const;
private:
// Internal representation of the current decimal value.
// Those variables are only used when the user is entering a value.
// Otherwise, the BigFraction m_internal_value is used.
Crypto::UnsignedBigInteger m_int_value { 0 };
Crypto::UnsignedBigInteger m_frac_value { 0 };
Crypto::UnsignedBigInteger m_frac_length { 0 };
// E.g. for -35.004200,
// m_negative = true
// m_int_value = 35
// m_frac_value = 4200
// m_frac_length = 6
mutable Crypto::BigFraction m_internal_value {};
unsigned m_displayed_fraction_length { 0 };
enum class State {
External,
TypingInteger,
TypingDecimal
};
State m_state { State::External };
};
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