84 lines
3.3 KiB
C++
84 lines
3.3 KiB
C++
#include "mainwindow.h"
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#include "ui_mainwindow.h"
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#include "conversion.h"
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#include <QClipboard>
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#include <QApplication>
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MainWindow::MainWindow(QWidget *parent)
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: QMainWindow(parent), ui(new Ui::MainWindow)
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{
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ui->setupUi(this);
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ui->categoryCombo->addItems({tr("温度"), tr("长度")});
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connect(ui->categoryCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
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this, &MainWindow::changeCategory);
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connect(ui->convertButton, &QPushButton::clicked, this, &MainWindow::convertValue);
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connect(ui->inputEdit, &QLineEdit::returnPressed, this, &MainWindow::convertValue);
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connect(ui->inputEdit, &QLineEdit::textChanged, this, &MainWindow::clearResult);
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connect(ui->fromCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
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this, &MainWindow::clearResult);
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connect(ui->toCombo, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
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this, &MainWindow::clearResult);
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connect(ui->swapButton, &QPushButton::clicked, this, [this] {
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const int previousFrom = ui->fromCombo->currentIndex();
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ui->fromCombo->setCurrentIndex(ui->toCombo->currentIndex());
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ui->toCombo->setCurrentIndex(previousFrom);
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ui->inputEdit->setFocus();
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});
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connect(ui->clearButton, &QPushButton::clicked, this, [this] {
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ui->inputEdit->clear();
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clearResult();
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ui->inputEdit->setFocus();
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});
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connect(ui->copyButton, &QPushButton::clicked, this, [this] {
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QApplication::clipboard()->setText(ui->resultEdit->text());
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ui->statusLabel->setText(tr("结果已复制。"));
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});
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changeCategory();
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ui->inputEdit->setText(QStringLiteral("25"));
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}
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MainWindow::~MainWindow() { delete ui; }
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void MainWindow::changeCategory()
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{
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const auto category = ui->categoryCombo->currentIndex() == 0
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? Conversion::Category::Temperature : Conversion::Category::Length;
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const QStringList names = Conversion::units(category);
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ui->fromCombo->clear();
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ui->toCombo->clear();
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ui->fromCombo->addItems(names);
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ui->toCombo->addItems(names);
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ui->fromCombo->setCurrentIndex(category == Conversion::Category::Length ? 2 : 0);
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ui->toCombo->setCurrentIndex(1);
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clearResult();
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}
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void MainWindow::clearResult()
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{
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ui->resultEdit->clear();
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ui->formulaLabel->setText(tr("选择单位并输入数值，点击“换算”查看计算过程。"));
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ui->statusLabel->clear();
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ui->copyButton->setEnabled(false);
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}
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void MainWindow::convertValue()
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{
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const auto category = ui->categoryCombo->currentIndex() == 0
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? Conversion::Category::Temperature : Conversion::Category::Length;
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const auto result = Conversion::convert(ui->inputEdit->text(), category,
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ui->fromCombo->currentIndex(),
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ui->toCombo->currentIndex());
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if (!result.ok) {
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clearResult();
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ui->statusLabel->setText(result.error);
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ui->inputEdit->setFocus();
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return;
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}
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ui->resultEdit->setText(QStringLiteral("%1 %2")
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.arg(result.value, 0, 'g', 12).arg(ui->toCombo->currentText()));
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ui->formulaLabel->setText(result.explanation);
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ui->statusLabel->setText(tr("换算完成。结果最多显示 12 位有效数字。"));
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ui->copyButton->setEnabled(true);
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}
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