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