mirror of
https://github.com/SerenityOS/serenity
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146 lines
3.6 KiB
C++
146 lines
3.6 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Keypad.h"
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#include "KeypadValue.h"
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#include <AK/IntegralMath.h>
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#include <AK/StringBuilder.h>
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Keypad::Keypad()
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{
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}
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Keypad::~Keypad()
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{
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}
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void Keypad::type_digit(int digit)
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{
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u64 previous_value = 0;
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switch (m_state) {
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case State::External:
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m_state = State::TypingInteger;
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m_negative = false;
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m_int_value = digit;
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m_frac_value = 0;
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m_frac_length = 0;
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break;
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case State::TypingInteger:
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VERIFY(m_frac_value.value() == 0);
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VERIFY(m_frac_length == 0);
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previous_value = m_int_value.value();
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m_int_value *= 10;
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m_int_value += digit;
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if (m_int_value.has_overflow())
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m_int_value = previous_value;
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break;
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case State::TypingDecimal:
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previous_value = m_frac_value.value();
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m_frac_value *= 10;
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m_frac_value += digit;
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if (m_frac_value.has_overflow())
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m_frac_value = previous_value;
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else
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m_frac_length++;
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break;
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}
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}
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void Keypad::type_decimal_point()
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{
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switch (m_state) {
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case State::External:
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m_negative = false;
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m_int_value = 0;
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m_frac_value = 0;
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m_frac_length = 0;
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m_state = State::TypingDecimal;
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break;
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case State::TypingInteger:
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VERIFY(m_frac_value.value() == 0);
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VERIFY(m_frac_length == 0);
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m_state = State::TypingDecimal;
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break;
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case State::TypingDecimal:
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// Ignore it.
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break;
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}
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}
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void Keypad::type_backspace()
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{
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switch (m_state) {
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case State::External:
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m_negative = false;
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m_int_value = 0;
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m_frac_value = 0;
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m_frac_length = 0;
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break;
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case State::TypingDecimal:
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if (m_frac_length > 0) {
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m_frac_value /= 10;
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m_frac_length--;
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break;
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}
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VERIFY(m_frac_value.value() == 0);
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m_state = State::TypingInteger;
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[[fallthrough]];
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case State::TypingInteger:
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VERIFY(m_frac_value.value() == 0);
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VERIFY(m_frac_length == 0);
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m_int_value /= 10;
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if (m_int_value.value() == 0)
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m_negative = false;
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break;
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}
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}
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KeypadValue Keypad::value() const
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{
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KeypadValue frac_part = { (i64)m_frac_value.value(), m_frac_length };
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KeypadValue int_part = { (i64)m_int_value.value() };
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KeypadValue res = int_part + frac_part;
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if (m_negative)
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res = -res;
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return res;
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}
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void Keypad::set_value(KeypadValue value)
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{
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m_state = State::External;
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if (value.m_value < 0) {
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m_negative = true;
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value = -value;
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} else
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m_negative = false;
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m_int_value = value.m_value / AK::pow<u64>(10, value.m_decimal_places);
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m_frac_value = value.m_value % AK::pow<u64>(10, value.m_decimal_places);
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m_frac_length = value.m_decimal_places;
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}
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String Keypad::to_string() const
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{
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StringBuilder builder;
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if (m_negative)
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builder.append("-");
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builder.appendff("{}", m_int_value.value());
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// NOTE: This is so the decimal point appears on screen as soon as you type it.
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if (m_frac_length > 0 || m_state == State::TypingDecimal)
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builder.append('.');
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if (m_frac_length > 0) {
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// FIXME: This disables the compiletime format string check since we can't parse '}}' here correctly.
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// remove the 'StringView { }' when that's fixed.
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builder.appendff("{:0{}}"sv, m_frac_value.value(), m_frac_length);
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}
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return builder.to_string();
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}
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