mirror of
https://github.com/SerenityOS/serenity
synced 2024-10-07 00:19:27 +00:00
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/*
|
|
* 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;
|
|
|
|
void type_digit(int digit);
|
|
void type_decimal_point();
|
|
void type_backspace();
|
|
|
|
Crypto::BigFraction value() const;
|
|
void set_value(Crypto::BigFraction);
|
|
void set_typed_value(Crypto::BigFraction);
|
|
void set_to_0();
|
|
|
|
void shrink(unsigned);
|
|
void set_rounding_length(unsigned);
|
|
unsigned rounding_length() const;
|
|
|
|
ErrorOr<String> to_string() const;
|
|
|
|
bool in_typing_state() 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,
|
|
TypedExternal,
|
|
TypingInteger,
|
|
TypingDecimal
|
|
};
|
|
|
|
State m_state { State::External };
|
|
};
|