多功能计算器（Qt版本）

#include "mainwindow.h" #include "ui_mainwindow.h" #include "myhelper.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); setWindowTitle("计算器"); setWindowIcon(QIcon(":/images/calculator-icon.png")); // 计算器类初始化 CALC = new Calculator; ifEqual = false; // 音乐播放器初始化 InitMusicPlayer(); // 初始化函数，添加音乐文件 player->play(); player->setVolume(20); // 设置音量 ui->sliderVolumn->setValue(20); // 设置音量滑条 playerState = true; // 状态为播放 connect(playlist,SIGNAL(currentIndexChanged(int)), this, SLOT(onPlaylistChanged(int))); connect(player,SIGNAL(positionChanged(qint64)), this, SLOT(onPositionChanged(qint64))); connect(player,SIGNAL(durationChanged(qint64)), this, SLOT(onDurationChanged(qint64))); // 跑马灯效果初始化 iSize = aMusicName.size(); curIndex = 0; mtimer = new QTimer(this); connect(mtimer, SIGNAL(timeout()), this, SLOT(scrollCaption())); mtimer->start(1000); // 计算器风格，默认为白色靓丽 on_actBGIWhite_triggered(); } MainWindow::~MainWindow() { delete ui; delete CALC; } void MainWindow::keyPressEvent(QKeyEvent *k) { // 键盘事件 switch(k->key()) { case Qt::Key_0:on_btn_0_clicked();break; case Qt::Key_1:on_btn_1_clicked();break; case Qt::Key_2:on_btn_2_clicked();break; case Qt::Key_3:on_btn_3_clicked();break; case Qt::Key_4:on_btn_4_clicked();break; case Qt::Key_5:on_btn_5_clicked();break; case Qt::Key_6:on_btn_6_clicked();break; case Qt::Key_7:on_btn_7_clicked();break; case Qt::Key_8:on_btn_8_clicked();break; case Qt::Key_9:on_btn_9_clicked();break; case Qt::Key_Plus:on_btnPlus_clicked();break; // + case Qt::Key_Minus:on_btnMinus_clicked();break; // - case Qt::Key_Asterisk:on_btnMulti_clicked();break; // * case Qt::Key_Slash:on_btnDiv_clicked();break; // / case Qt::Key_Backspace:on_btnBack_clicked();break; // ← case Qt::Key_Enter:on_btnEqual_clicked();break; // = case Qt::Key_Return:on_btnEqual_clicked();break; // = case Qt::Key_Equal:on_btnEqual_clicked();break; // = case Qt::Key_Period:on_btnPoint_clicked();break; // . case Qt::Key_ParenLeft:on_btnLeftPare_clicked();break; // ( case Qt::Key_ParenRight:on_btnRightPare_clicked();break; // ) case Qt::Key_Percent:on_btn_mod_clicked();break; // % case Qt::Key_AsciiCircum:on_btn_pow_clicked();break; // ^ } } void MainWindow::InitMusicPlayer() { // 添加音乐文件 player = new QMediaPlayer(this); playlist = new QMediaPlaylist(this); musicList = (QStringList() << "qrc:/music/My Soul (Bonus Track).mp3" << "qrc:/music/陈焕明 - 天空之城.mp3" << "qrc:/music/玖月花儿与筝 - 琵琶语 (古筝版).mp3" ); for (int i = 0; i < musicList.count(); i++) { QString aMusic = musicList.at(i); playlist->addMedia(QUrl(aMusic)); } playlist->setPlaybackMode(QMediaPlaylist::Loop); //循环模式 player->setPlaylist(playlist); aMusicName = musicList.at(0); aMusicName = aMusicName.section("/", 2, 2); ui->LabCurMedia->setText(aMusicName); // 当前音乐名添加到Label标签 } void MainWindow::onPlaylistChanged(int position) { aMusicName = musicList.at(position); aMusicName = aMusicName.section("/", 2, 2); ui->LabCurMedia->setText(aMusicName); // 当前音乐名添加到Label标签 iSize = aMusicName.size(); // 跑马灯重置 curIndex = 0; } void MainWindow::onDurationChanged(qint64 duration) { int secs = duration/1000; //秒 int mins = secs/60; //分钟 secs = secs % 60; //余数秒 durationTime = QString::asprintf("%d:%d", mins, secs); ui->LabRatio->setText(positionTime + "/" + durationTime); } void MainWindow::onPositionChanged(qint64 position) { int secs = position/1000; //秒 int mins = secs/60; //分钟 secs = secs % 60; //余数秒 positionTime = QString::asprintf("%d:%d", mins, secs); ui->LabRatio->setText(positionTime + "/" + durationTime); } void MainWindow::scrollCaption() { if (curIndex > iSize) curIndex = 0; ui->LabCurMedia->setText(aMusicName.mid(curIndex++)); // .mid（pos）； 从pos开始截取字符串 } void MainWindow::on_btnEqual_clicked() { ifEqual = true; // 实现连续计算功能 QString input = ui->lineEdInput->text(); input = input.trimmed(); // 去掉字符串首尾的空格 input += "#"; QString errorInfo = ""; // 错误信息 double result; if (CALC->Run(input, result, errorInfo)){ ui->lineEdResult->setText(QString::number(result)); } else{ QMessageBox::warning(this, "警告", errorInfo); on_btnClear_clicked(); } } void MainWindow::on_btnClear_clicked() { ui->lineEdInput->clear(); ui->lineEdResult->clear(); CALC->Clear(); } void MainWindow::on_btnCE_clicked() { ui->lineEdInput->clear(); } void MainWindow::on_btn_1_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "1"; ui->lineEdInput->setText(input); } void MainWindow::on_btn_2_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "2"; ui->lineEdInput->setText(input); } void MainWindow::on_btn_3_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "3"; ui->lineEdInput->setText(input); } void MainWindow::on_btn_4_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "4"; ui->lineEdInput->setText(input); } void MainWindow::on_btn_5_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "5"; ui->lineEdInput->setText(input); } void MainWindow::on_btn_6_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "6"; ui->lineEdInput->setText(input); } void MainWindow::on_btn_7_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "7"; ui->lineEdInput->setText(input); } void MainWindow::on_btn_8_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "8"; ui->lineEdInput->setText(input); } void MainWindow::on_btn_9_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "9"; ui->lineEdInput->setText(input); } void MainWindow::on_btn_0_clicked() { if (ifEqual){ on_btnClear_clicked(); ifEqual = false; } QString input = ui->lineEdInput->text(); input += "0"; ui->lineEdInput->setText(input); } void MainWindow::on_btnPoint_clicked() { if (ifEqual){ on_btnClear_clicked(