QT学习Demo例程1

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QFontDialog> void initFileMenu(MainWindow* mainWindow, QMenu* fileMenu); void testMutableInLambda(QWidget* parent); void testReturnInLambda(); void testOnButtonClick(MainWindow* mainWindow); void showModeDialog(QWidget* parent); void showNoneModeDialog(QWidget* parent); void showMessageBox(QWidget* parent, int dialogType); void showColorDialog(QWidget* parent); void showFileDialog(QWidget* parent); void showFontDialog(QWidget* parent); MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); resize(600, 400); initFileMenuItems(); initMenuBar(); initToolBar(); initStatusBar(); initDockWidget(); initCentralWidget(); } void MainWindow::initCentralWidget() { this->textEdit = new QTextEdit(this); setCentralWidget(this->textEdit); } void MainWindow::initDockWidget() { this->dockWidget = new QDockWidget("Float Content"); addDockWidget(Qt::BottomDockWidgetArea, this->dockWidget); } void MainWindow::initStatusBar() { this->myStatusBar = statusBar(); setStatusBar(myStatusBar); // 放入标签控件 QLabel* label = new QLabel("Tips"); myStatusBar->addWidget(label); // 右侧持久标签 QLabel* rightLabel = new QLabel("Right Tips"); myStatusBar->addPermanentWidget(rightLabel); } void MainWindow::initToolBar() { this->toolBar = new QToolBar(this); addToolBar(Qt::TopToolBarArea, this->toolBar); toolBar->setAllowedAreas(Qt::TopToolBarArea | Qt::LeftToolBarArea); toolBar->setFloatable(false); toolBar->setMovable(false); toolBar->addAction(this->fileMenuItems.at(0)); toolBar->addSeparator(); toolBar->addAction(this->fileMenuItems.at(1)); } void MainWindow::initMenuBar() { this->myMenuBar = menuBar(); this->setMenuBar(myMenuBar); QMenu* fileMenu = myMenuBar->addMenu("File"); initFileMenu(this, fileMenu); QMenu* editorMenu = myMenuBar->addMenu("Edit"); } void MainWindow::initFileMenuItems() { QAction* newAction = new QAction("New"); //使用QT资源： : + 前缀名 + 资源名 newAction->setIcon(QIcon(":/image/robot_hand.svg")); this->fileMenuItems.append(newAction); connect(newAction, &QAction::triggered, this, [=](){ // showModeDialog(this); // showNoneModeDialog(this); // showMessageBox(this, 4); // showColorDialog(this); // showFileDialog(this); showFontDialog(this); }); this->fileMenuItems.append(new QAction("Open")); } void showFontDialog(QWidget* parent) { bool flag; QFont font = QFontDialog::getFont(&flag, QFont("Times New Roman", 14)); QString res = QString("Family:%1, Size:%2, Bold:%3, Italic:%4").arg(font.family()).arg(font.pointSize()).arg(font.bold()) .arg(font.italic()); qDebug() << res; } void showFileDialog(QWidget* parent) { QString filePath = QFileDialog::getOpenFileName(parent, "Sk Open File", "C:\\Users\\imt2047\\Desktop", "(*.png)"); qDebug() << filePath; } void showColorDialog(QWidget* parent) { QColor color = QColorDialog::getColor(QColor(255, 0, 0)); QString str = QString("[%1, %2, %3]").arg(color.red()).arg(color.green()).arg(color.blue()); qDebug() << str; } void showMessageBox(QWidget* parent, int dialogType) { switch (dialogType) { case 1: { QMessageBox::critical(parent, "critial", "critial happened"); break; } case 2: { QMessageBox::information(parent, "information", "information happened"); break; } case 3: { QMessageBox::StandardButton result = QMessageBox::question(parent, "ques", "question happened", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes); if (result == QMessageBox::Yes) { qDebug() << "Yes"; } else { qDebug() << "No"; } break; } case 4: { QMessageBox::warning(parent, "warning", "warning happened"); break; } default: QMessageBox::critical(parent, "critial", "critial happened"); break; } } void showNoneModeDialog(QWidget* parent) { QDialog* dialog = new QDialog(parent); dialog->resize(200, 100); dialog->setAttribute(Qt::WA_DeleteOnClose); dialog->show(); } void showModeDialog(QWidget* parent) { QDialog dialog(parent); dialog.resize(200, 100); dialog.exec(); } void initFileMenu(MainWindow* mainWindow, QMenu* fileMenu) { QList<QAction*> fileMenuItems = mainWindow->getFileMenuItems(); fileMenu->addAction(fileMenuItems.at(0)); fileMenu->addSeparator(); fileMenu->addAction(fileMenuItems.at(1)); } void testConnect(MainWindow* mainWindow) { Teacher* teacher = mainWindow->getTeacher(); Student* student = mainWindow->getStudent(); QPushButton* classOverButton = mainWindow->getClassOverButton(); teacher = new Teacher(mainWindow); student = new Student(mainWindow); void (Teacher::*hungryMethod)(QString) = &Teacher::hungry; void (Student::*treatMethod)(QString) = &Student::treat; mainWindow->connect(teacher, hungryMethod, student, treatMethod); classOverButton = new QPushButton("class over", mainWindow); // connect(classOverButton, &QPushButton::clicked, this, &MainWindow::classOver); //信号连接信号 void (Teacher::*hungryMethodPure)(void) = &Teacher::hungry; void (Student::*treatMethodPure)(void) = &Student::treat; mainWindow->connect(teacher, hungryMethodPure, student, treatMethodPure); mainWindow->connect(classOverButton, &QPushButton::clicked, teacher, hungryMethodPure); } /** * @brief testOnButtonClick,利用lambda表达式实现槽函数功能 * * @param mainWindow */ void testOnButtonClick(MainWindow* mainWindow) { QPushButton* button = new QPushButton("Clock window", mainWindow); button->move(100, 100); mainWindow->connect(button, &QPushButton::clicked, mainWindow, [=](){ mainWindow->getStudent()->treat("Coco cola"); mainWindow->close(); }); } void testReturnInLambda() { int ret = []()->int{return 1000;}(); qDebug() << "ret = " << ret; } void testMutableInLambda(QWidget* parent) { //mutable关键字表示可以修改值传递的变量，但是修改的是拷贝，并不是变量本身 QPushButton* myBtn = new QPushButton(parent); QPushButton* myBtn2 = new QPushButton(parent); myBtn2->move(100, 100); int m = 10; parent->connect(myBtn, &QPushButton::clicked, parent, [m]()mutable {m = 110; qDebug() << m;}); parent->connect(myBtn2, &QPushButton::clicked, parent, [=](){qDebug() << m;}); qDebug() << m; } MainWindow::~MainWindow() { delete ui; } void MainWindow::classOver() { emit this->teacher->hungry("Noodles"); } QList<QAction*> MainWindow::getFileMenuItems() { return this->fileMenuItems; } QMenuBar* MainWindow::getMyMenuBar() { return this->myMenuBar; } QPushButton* MainWindow::getClassOverButton() { return this->classOverButton; } Teacher* MainWindow::getTeacher() { return this->teacher; } Student* MainWindow::getStudent() { return this->student; } QStatusBar *MainWindow::getMyStatusBar() const { return myStatusBar; } void MainWindow::setMyStatusBar(QStatusBar *value) { myStatusBar = value; } QDockWidget *MainWindow::getDockWidget() const { return dockWidget; } void MainWindow::setDockWidget(QDockWidget *value) { dockWidget = value; }