C++系列三：QT代码库

目录

• 前言
• QT
  • 小记
  • 1. 菜单栏、工具栏、状态栏
  • 2. 自定义的对话框
  • 3. 任务管理器
  • 4. 链接数据库mysql，sqlite
  • 5. Widgets Gallery Example 代码学习：
  • 999.Controls
• QT-For-Python
  • 1. Demo
• QT-Quick
  • 1. HelloWorld
  • 2. 简单表单

前言

记录有关qt的案例。

QT小记

知识点：1. ui_widget.h：类的名称是Ui_widget.h，根据组件、信号与信号槽自动生成。2. 数学运算函数在  头文件中定义3. 消息显示： qDebug，qWarning、qCritical、qFatal、qInfo 4. 全局宏：QT_VERSION、QT_VERSION_STR、5. 容器：QList、QStack和QQueue；QMap、QMultiMap、QHash、QMultiHash和QSet。6. QGridLayout类添加组件的函数是addWidget()：7. QAbstractButton的autoExclusive属性：如果启用了自动独占性，属于同一个父部件的可检查按钮将互斥。8. QGroupBox的flat属性：可以最小化区域框的空间消耗。在大多数样式中，启用这个属性会移除框架的左边缘、右边缘和底边。9. Sql模块对Cmake文件添加： find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Sql REQUIRED)在target_link_libraries中添加Qt${QT_VERSION_MAJOR}::Sql代码：1. 编码格式#include   //添加头文件QTextCodec::setCodecForTr(QTextCodec::codecForLocale()); //设置编码QTextCodec::setCodecForTr(QTextCodec::codecForName("GB2312"));2. tr()函数 =>随国际化变化。ui->pushButton->setText(tr("新窗口"));4. 常用控件属性设置：if(ui->usrLineEdit->text().trimmed() == tr("admin")&& ui->pwdLineEdit->text() == tr("123456"))QLabel *lab; //声明this->lab=new QLabel("hello,world",this);ui->firstBtn->setText("新窗口");QMessageBox::warning(this, tr("Waring"),tr("error!"), QMessageBox::Yes);                      ui->pwdLineEdit->clear();ui->usrLineEdit->setFocus();5. 菜单设置：// 创建新的动作 添加图标 设置快捷键QAction *openAction = new QAction(tr("&Open"), this);QIcon icon(":/myImages/images/close.png");openAction->setIcon(icon);openAction->setShortcut(QKeySequence(tr("Ctrl+O")));ui->menu_F->addAction(openAction);6. 其他：//记事本打开myResources.qrc //文件(&F)//添加资源文件=>/myImages=>images=>需要的图标文件粘贴进去=>可以别名是一个XML文档表明将菜单的快捷键设置为了Alt+ Ficon(":/myImages/close");7. qDebug("111"+str); qDebug()<plainTextEdit->font();font.setBold(checked);//font.setItalic(checked);font.setUnderline(checked);ui->plainTextEdit->setFont(font);QPalette plet=ui->plainTextEdit->palette();if(ui->radioButton_black->isChecked())    plet.setColor(QPalette::Text,Qt::black);if(ui->radioButton_blue->isChecked())    plet.setColor(QPalette::Text,Qt::blue);if(ui->radioButton_red->isChecked())    plet.setColor(QPalette::Text,Qt::red);ui->plainTextEdit->setPalette(plet);QPushButton btn("button");QObject::connect(&btn,&QPushButton::clicked,&QApplication::quit);QObject::connect(&btn,&QPushButton::clicked,[](bool) {        qDebug() <setText ("图片保存为："+ fileName);}10. 布局分布管理 stretchlayoutStretch：0,0,0，表示3个组件平均分配宽度layoutStretch：0,0,1，表示前两个组件达到合适宽度后不再增加宽度，其余的空间都分配给第三个组件layoutStretch：1,1,2，表示前两个组件达到合适宽度后将尽量满足1:1:2的比例11. 分割条允许用户通过拖动子widget之间的边界来控制子widget的大小。QSplitter *splitter = new QSplitter(parent);QListView *listview = new QListView;QTreeView *treeview = new QTreeView;QTextEdit *textedit = new QTextEdit;splitter->addWidget(listview);splitter->addWidget(treeview);splitter->addWidget(textedit);//splitter->setOrientation(Qt::Vertical);12. foreachQList values;foreach (QString str, values)    qDebug() << str;13.// 移除帮助按钮。windowFlags() 当前窗口的标志位（flags）、取反，按位与运算setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);//用户使用键盘快捷键时，可以通过按下 "Alt + S" 来聚焦到 styleComboBox。auto styleLabel = createWidget1(tr("&Style:"), "styleLabel");styleLabel->setBuddy(styleComboBox);//全局快捷键：new QShortcut(tr("Ctrl+p"), this, this, &WidgetGallery::demo);demo是一个信号//参数带入，版本宏setWindowTitle(tr("Widget Gallery Qt %1").arg(QT_VERSION_STR));qDebug() << "Qt version: " << QT_VERSION;qDebug() << "Qt major version: " << QT_VERSION_MAJOR;qDebug() << "Qt minor version: " << QT_VERSION_MINOR;qDebug() << "Qt patch version: " << QT_VERSION_PATCH;999. QMetaObject类int main(int argc, char *argv[]){    QApplication a(argc, argv);    //QObject::metaObject返回类关联的元对象    QObject *btn = new QPushButton;    qDebug()<metaObject()->className(); //返回“QPushButton”    QPushButton *btnPush=qobject_cast(btn);//qobject_cast类似于标准C++中的dynamic_cast    qDebug()<metaObject()->className();    QTimer *timer = new QTimer();               //QTimer是QObject的子类    qDebug()<inherits("QTimer");        //返回true    qDebug()<inherits("QObject");       //返回true    qDebug()<inherits("QAbstrctButton");//返回false    //superClass返回父类的元对象    qDebug()<metaObject()->superClass()->className();}1000：属性系统：Q_PROPERTY(bool focus READ hasFocus) Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled) Q_PROPERTY(QCursor cursor READ cursor WRITE SetCursor RESET unsetCursor) int main(int argc, char *argv[]){    QApplication a(argc, argv);    QPushButton *button = new QPushButton;    QObject *object = button;    bool isFlat = object->property("flateee").toBool();    qDebug()<setProperty("flateee",true);    isFlat = object->property("flateee").toBool();    qDebug()<metaObject();    int index=meta->indexOfProperty("down");    QMetaProperty prop=meta->property(index);    bool res=prop.isWritable();    qDebug()<<" down(QPushButton) isWritable?: "<<res;}1001：类的附加信息Q_OBJECT Q_CLASSINFO("author","Wang") Q_CLASSINFO("compay","UPC")Q_CLASSINFO("version","3.0.1")QMyWidget * myWidget = new QMyWidget;qDebug()<metaObject()->classInfo(0).name();qDebug()<metaObject()->classInfo(0).value(); qDebug()<metaObject()->classInfo(1).name(); qDebug()<metaObject()->classInfo(1).value();1002. 自定义信号及其使用：class QPerson:public QObject { Q_OBJECT private: int m_age = 10; public: void incAge(); signals: void ageChanged(int value); }; void QPerson::incAge() { m_age++; emit ageChanged(m_age); //发射信号 1003：容器：QList list; //定义一个float类型的数据列表QList list={1,2,3,4,5};//初始化列表数据QList list(100); //初始化列表元素个数为100，所有元素默认为0QList strList(10,"pass");//10个元素，每个元素都被初始化为passQList list;list<<"Monday"<<"Tuesday"<<"Wednesday"<<"Thursday";list.append("Friday");QString str1=list[0];        //QList::const_reference QList::operator[](qsizetype i) constQString str2=list.at(1);  //------------QMap map;map["one"] = 1;map["three"] = 3;map["seven"] = 7map.insert("twelve", 12);int num1 = map["one"];//如果在map中没有指定键的项，这些函数返回一个默认构造的值。int num2 = map["thirteen"];int num3 = map.value("thirteen");//还有一个value()重载方法，如果指定的键不存在，则使用第二个参数作为默认值 int num4 = map.value("thirteen",13);

1. 菜单栏、工具栏、状态栏

QApplication a(argc, argv);MainWindow mainWindow;// 创建菜单栏QMenuBar *menuBar = mainWindow.menuBar();QMenu *fileMenu = menuBar->addMenu("文件");QMenu *editMenu = menuBar->addMenu("编辑");// 创建工具栏QToolBar *toolBar = mainWindow.addToolBar("工具栏");toolBar->addAction("打开");toolBar->addAction("保存");toolBar->addSeparator();toolBar->addAction("剪切");toolBar->addAction("复制");toolBar->addAction("粘贴");// 创建状态栏QStatusBar *statusBar = mainWindow.statusBar();statusBar->showMessage("准备就绪");mainWindow.setGeometry(100, 100, 800, 600); // 设置主窗口的位置和大小mainWindow.setWindowTitle("Qt 示例应用程序");mainWindow.show();

2. 自定义的对话框

#include #include #include #include #include #include #include #include #include #include #include #include #include #include class CustomDialog : public QDialog{public:    CustomDialog(QWidget *parent = nullptr)        : QDialog(parent)    {        setWindowTitle("自定义对话框");        QLabel *label = new QLabel("请输入文本:", this);        lineEdit = new QLineEdit(this);        QPushButton *okButton = new QPushButton("确定", this);        QPushButton *cancelButton = new QPushButton("取消", this);        QVBoxLayout *layout = new QVBoxLayout;        layout->addWidget(label);        layout->addWidget(lineEdit);        layout->addWidget(okButton);        layout->addWidget(cancelButton);        setLayout(layout);        connect(okButton, &QPushButton::clicked, this, &CustomDialog::accept);        connect(cancelButton, &QPushButton::clicked, this, &CustomDialog::reject);    }    QString getText() const    {        return lineEdit->text();    }private:    QLineEdit *lineEdit;};int main(int argc, char *argv[]){    QApplication app(argc, argv);    QMainWindow mainWindow;    QMenuBar *menuBar = mainWindow.menuBar();    QMenu *fileMenu = menuBar->addMenu("文件");    QMenu *editMenu = menuBar->addMenu("编辑");    QToolBar *toolBar = mainWindow.addToolBar("工具栏");    QTextEdit *textEdit = new QTextEdit(&mainWindow);    mainWindow.setCentralWidget(textEdit);    QStatusBar *statusBar = mainWindow.statusBar();    // 在菜单栏和工具栏中添加操作    QAction *openAction = fileMenu->addAction("打开");    QAction *saveAction = fileMenu->addAction("保存");    fileMenu->addSeparator();    QAction *customDialogAction = editMenu->addAction("自定义对话框");    toolBar->addAction(openAction);    toolBar->addAction(saveAction);    toolBar->addSeparator();    toolBar->addAction(customDialogAction);    QObject::connect(openAction, &QAction::triggered, [&]() {        QString fileName = QFileDialog::getOpenFileName(&mainWindow, "打开文件");        if (!fileName.isEmpty()) {            QFile file(fileName);            if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {                textEdit->setPlainText(file.readAll());                file.close();            }        }    });    QObject::connect(saveAction, &QAction::triggered, [&]() {        QString fileName = QFileDialog::getSaveFileName(&mainWindow, "保存文件");        if (!fileName.isEmpty()) {            QFile file(fileName);            if (file.open(QIODevice::WriteOnly | QIODevice::Text)) {                QTextStream out(&file);                out <toPlainText();                file.close();            }        }    });    QObject::connect(customDialogAction, &QAction::triggered, [&]() {        CustomDialog dialog(&mainWindow);        if (dialog.exec() == QDialog::Accepted) {            QString text = dialog.getText();            if (!text.isEmpty()) {                statusBar->showMessage("自定义对话框输入: " + text, 5000);            }        }    });    mainWindow.setGeometry(100, 100, 800, 600);    mainWindow.setWindowTitle("高级 Qt 示例");    mainWindow.show();    return app.exec();}

3. 任务管理器

#include #include #include #include #include #include #include class TaskManager : public QMainWindow{    Q_OBJECTpublic:    TaskManager(QWidget *parent = nullptr)        : QMainWindow(parent)    {        setWindowTitle("任务管理器");        taskList = new QListWidget(this);        setCentralWidget(taskList);        createMenus();    }private:    QListWidget *taskList;    void createMenus()    {        QMenu *taskMenu = menuBar()->addMenu("任务");        QAction *addAction = taskMenu->addAction("添加任务");        connect(addAction, &QAction::triggered, this, &TaskManager::addTask);        QAction *removeAction = taskMenu->addAction("删除任务");        connect(removeAction, &QAction::triggered, this, &TaskManager::removeTask);        QAction *completeAction = taskMenu->addAction("完成任务");        connect(completeAction, &QAction::triggered, this, &TaskManager::completeTask);    }private slots:    void addTask()    {        bool ok;        QString taskName = QInputDialog::getText(this, "添加任务", "输入任务名称:", QLineEdit::Normal, "", &ok);        if (ok && !taskName.isEmpty()) {            taskList->addItem(taskName);        }    }    void removeTask()    {        QListWidgetItem *selectedItem = taskList->currentItem();        if (selectedItem) {            delete selectedItem;        }    }    void completeTask()    {        QListWidgetItem *selectedItem = taskList->currentItem();        if (selectedItem) {            selectedItem->setFlags(selectedItem->flags() | Qt::ItemIsUserCheckable);            selectedItem->setCheckState(Qt::Checked);        }    }};int main(int argc, char *argv[]){    QApplication app(argc, argv);    TaskManager taskManager;    taskManager.show();    return app.exec();}#include "main.moc"  // 使用Qt的元对象系统时需要的moc文件

4. 链接数据库mysql，sqlite

1. cmake:find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Sql REQUIRED)target_link_libraries(20231121_C1 PRIVATE Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Sql)2. 将本地的mysql：D:\mysql-5.7.37-winx64\lib: libmysql.lib、libmysqld.lib 放置E:\QT\Qt4.6\6.5.2\msvc2019_64\bin目录下；重启qt;3.代码测试：//代码：#include "QtSql/qsqlquery.h"#include #include #include #include #include int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    QStringList drivers = QSqlDatabase::drivers();  //获取现在可用的数据库驱动    foreach(QString driver, drivers)        qDebug() << driver;    // 设置 SQLite 数据库连接    // QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");    //db.setDatabaseName("mydatabase.db");    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");    db.setHostName("127.0.0.1");    db.setPort(3306);    db.setDatabaseName("mydata");    db.setUserName("root");    db.setPassword("123456");    // 打开数据库    if (!db.open()) {        qDebug() << "无法打开数据库";        return -1;    }//    // 在数据库中创建表//    QSqlQuery query;//    query.exec("CREATE TABLE IF NOT EXISTS tasks (id INTEGER PRIMARY KEY, name TEXT)");//    // 插入数据//    query.prepare("INSERT INTO tasks (name) VALUES (:name)");//    query.bindValue(":name", "完成 Qt 学习");//    query.exec();//    query.bindValue(":name", "写一个小程序");//    query.exec();    // 查询数据    QSqlQuery query;    query.exec("SELECT * FROM student");    while (query.next()) {        int id = query.value("id").toInt();        QString name = query.value("name").toString();        qDebug() << "任务 ID:" << id << ", 任务名称:" << name;    }    // 关闭数据库    db.close();    return a.exec();}

5. Widgets Gallery Example 代码学习：

999.Controls

//QPushButtonQPushButton *button = new QPushButton("点击我", &w); button.setText("Click me!");  QObject::connect(&button, &QPushButton::clicked, [&](){      // button被点击时执行的代码      qDebug() <setIcon(QIcon(":/icon.png")); // 设置图标toolButton->setText("工具按钮"); // 设置文本layout->addWidget(toolButton);// 将QToolButton添加到布局中// 设置窗口的布局window.setLayout(layout);//QRadioButtonQRadioButton *radioButton1 = new QRadioButton("选项 1");// 创建三个单选按钮QRadioButton *radioButton2 = new QRadioButton("选项 2");QRadioButton *radioButton3 = new QRadioButton("选项 3");// 将单选按钮添加到布局中layout->addWidget(radioButton1);layout->addWidget(radioButton2);layout->addWidget(radioButton3);//QCheckBoxQCheckBox *checkBox1 = new QCheckBox("选项 1");// 创建三个复选框QCheckBox *checkBox2 = new QCheckBox("选项 2");QCheckBox *checkBox3 = new QCheckBox("选项 3");// 将复选框添加到布局中layout->addWidget(checkBox1);layout->addWidget(checkBox2);layout->addWidget(checkBox3);//QListView// 创建一个QStringListModel，用于存储列表项的数据QStringListModel *model = new QStringListModel;// 添加一些示例数据QStringList items;items << "项1" << "项2" << "项3" << "项4" <setStringList(items);// 创建一个QListView并设置模型QListView *listView = new QListView;listView->setModel(model);//QTreeView// 创建一个QStandardItemModel，用于存储树形数据QStandardItemModel *model = new QStandardItemModel;// 创建一个根节点QStandardItem *rootItem = model->invisibleRootItem();// 创建一些子节点QStandardItem *item1 = new QStandardItem("节点1");QStandardItem *item2 = new QStandardItem("节点2");QStandardItem *item3 = new QStandardItem("节点3");// 将子节点添加到根节点rootItem->appendRow(item1);rootItem->appendRow(item2);rootItem->appendRow(item3);// 创建一个QTreeView并设置模型QTreeView *treeView = new QTreeView;treeView->setModel(model);//QTableView// 创建一个QStandardItemModel，用于存储表格数据QStandardItemModel *model = new QStandardItemModel;// 设置表头model->setHorizontalHeaderLabels({"列1", "列2", "列3"});// 插入一些数据for (int row = 0; row < 5; ++row) {    for (int column = 0; column index(row, column, QModelIndex());        model->setData(index, QString("行%1，列%2").arg(row + 1).arg(column + 1));    }}// 创建一个QTableView并设置模型QTableView *tableView = new QTableView;tableView->setModel(model);//QColumnView// 创建一个QFileSystemModel，用于显示文件系统QFileSystemModel *model = new QFileSystemModel;// 设置模型的根目录，这里设置为当前目录model->setRootPath(QDir::currentPath());// 创建一个QColumnView并设置模型QColumnView *columnView = new QColumnView;columnView->setModel(model);//QUndoView用于显示和管理撤销/重做操作的控件// 创建一个QUndoStack来管理操作历史记录QUndoStack undoStack;// 创建一个QUndoView来显示操作历史记录QUndoView undoView(&undoStack);undoView.setEmptyLabel("无可撤销操作");// 创建一个按钮来执行一个示例操作QPushButton button("执行操作");QObject::connect(&button, &QPushButton::clicked, [&]() {    // 在这里执行一个示例操作，将其添加到撤销堆栈中    undoStack.push(new QUndoCommand("示例操作"));});//QListWidget// 创建一个QListWidgetQListWidget *listWidget = new QListWidget;// 创建一些示例列表项QListWidgetItem *item1 = new QListWidgetItem("项目1");QListWidgetItem *item2 = new QListWidgetItem("项目2");QListWidgetItem *item3 = new QListWidgetItem("项目3");// 将列表项添加到QListWidgetlistWidget->addItem(item1);listWidget->addItem(item2);listWidget->addItem(item3);//QTreeWidget// 创建一个QTreeWidget，用于显示树形数据QTreeWidget *treeWidget = new QTreeWidget;// 创建树形控件的列标题QStringList headers;headers << "列1" <setHeaderLabels(headers);// 创建根节点QTreeWidgetItem *rootItem = new QTreeWidgetItem(treeWidget);rootItem->setText(0, "根节点");// 创建一些子节点QTreeWidgetItem *item1 = new QTreeWidgetItem(rootItem);item1->setText(0, "子节点1");item1->setText(1, "子节点1的列2");QTreeWidgetItem *item2 = new QTreeWidgetItem(rootItem);item2->setText(0, "子节点2");item2->setText(1, "子节点2的列2");// 将根节点添加到树形控件treeWidget->addTopLevelItem(rootItem);//QTableWidget// 创建一个QTableWidget，用于显示表格数据QTableWidget *tableWidget = new QTableWidget;// 设置表格的行数和列数tableWidget->setRowCount(3); // 3行tableWidget->setColumnCount(2); // 2列// 设置表格的表头QStringList headers;headers << "列1" <setHorizontalHeaderLabels(headers);// 在表格中插入一些数据tableWidget->setItem(0, 0, new QTableWidgetItem("行1列1"));tableWidget->setItem(0, 1, new QTableWidgetItem("行1列2"));tableWidget->setItem(1, 0, new QTableWidgetItem("行2列1"));tableWidget->setItem(1, 1, new QTableWidgetItem("行2列2"));tableWidget->setItem(2, 0, new QTableWidgetItem("行3列1"));tableWidget->setItem(2, 1, new QTableWidgetItem("行3列2"));//QScrollArea// 创建一个QScrollArea用于显示滚动区域QScrollArea *scrollArea = new QScrollArea;// 创建一个大的QWidget，用于放置内容QWidget *contentWidget = new QWidget;// 创建一个垂直布局管理器用于大的QWidgetQVBoxLayout *contentLayout = new QVBoxLayout(contentWidget);// 向大的QWidget添加一些按钮for (int i = 0; i addWidget(button);}// 设置大的QWidget为QScrollArea的视口scrollArea->setWidget(contentWidget);//QToolBox// 创建一个QToolBoxQToolBox *toolBox = new QToolBox;// 创建多个页面并添加到QToolBox中QWidget *page1 = new QWidget;QPushButton *button1 = new QPushButton("按钮 1");page1->setLayout(new QVBoxLayout);page1->layout()->addWidget(button1);toolBox->addItem(page1, "页面 1");QWidget *page2 = new QWidget;QLabel *label2 = new QLabel("标签 2");page2->setLayout(new QVBoxLayout);page2->layout()->addWidget(label2);toolBox->addItem(page2, "页面 2");QWidget *page3 = new QWidget;QLabel *label3 = new QLabel("标签 3");page3->setLayout(new QVBoxLayout);page3->layout()->addWidget(label3);toolBox->addItem(page3, "页面 3");//QTabWidget// 创建一个QTabWidgetQTabWidget *tabWidget = new QTabWidget;// 创建多个选项卡页面并添加到QTabWidget中QWidget *page1 = new QWidget;QPushButton *button1 = new QPushButton("按钮 1");page1->setLayout(new QVBoxLayout);page1->layout()->addWidget(button1);tabWidget->addTab(page1, "选项卡 1");QWidget *page2 = new QWidget;QLabel *label2 = new QLabel("标签 2");page2->setLayout(new QVBoxLayout);page2->layout()->addWidget(label2);tabWidget->addTab(page2, "选项卡 2");QWidget *page3 = new QWidget;QLabel *label3 = new QLabel("标签 3");page3->setLayout(new QVBoxLayout);page3->layout()->addWidget(label3);tabWidget->addTab(page3, "选项卡 3");//QStackedWidget// 创建一个QWidget窗口QWidget window;// 创建一个垂直布局管理器QVBoxLayout *layout = new QVBoxLayout(&window);// 创建一个QStackedWidgetQStackedWidget *stackedWidget = new QStackedWidget;// 创建多个页面并添加到QStackedWidget中QWidget *page1 = new QWidget;QPushButton *button1 = new QPushButton("按钮 1");page1->setLayout(new QVBoxLayout);page1->layout()->addWidget(button1);stackedWidget->addWidget(page1);QWidget *page2 = new QWidget;QLabel *label2 = new QLabel("标签 2");page2->setLayout(new QVBoxLayout);page2->layout()->addWidget(label2);stackedWidget->addWidget(page2);QWidget *page3 = new QWidget;QLabel *label3 = new QLabel("标签 3");page3->setLayout(new QVBoxLayout);page3->layout()->addWidget(label3);stackedWidget->addWidget(page3);// 设置默认显示的页面stackedWidget->setCurrentIndex(0);// 将QStackedWidget添加到布局中layout->addWidget(stackedWidget);// 创建按钮来切换页面QPushButton *nextButton = new QPushButton("下一页");layout->addWidget(nextButton);// 设置窗口的布局window.setLayout(layout);// 连接按钮的点击事件，用于切换页面QObject::connect(nextButton, &QPushButton::clicked, [&]() {    int currentIndex = stackedWidget->currentIndex();    int nextPageIndex = (currentIndex + 1) % stackedWidget->count();    stackedWidget->setCurrentIndex(nextPageIndex);});// 设置窗口的大小window.resize(300, 200);// 显示窗口window.show();//QFrame// 创建一个QFrameQFrame *frame = new QFrame;// 设置QFrame的样式，添加边框frame->setFrameStyle(QFrame::Panel | QFrame::Raised);// 创建一些小部件并添加到QFrame中QPushButton *button = new QPushButton("按钮");QLabel *label = new QLabel("标签");QVBoxLayout *frameLayout = new QVBoxLayout(frame);frameLayout->addWidget(button);frameLayout->addWidget(label);//QComboBox// 创建一个QComboBoxQComboBox *comboBox = new QComboBox;// 向QComboBox添加选项comboBox->addItem("选项 1");comboBox->addItem("选项 2");comboBox->addItem("选项 3");// 将QComboBox添加到布局中layout->addWidget(comboBox);//QFontComboBox// 创建一个QWidget窗口QWidget window;// 创建一个垂直布局管理器QVBoxLayout *layout = new QVBoxLayout(&window);// 创建一个QFontComboBoxQFontComboBox *fontComboBox = new QFontComboBox;// 创建一个标签来显示所选字体示例QLabel *label = new QLabel("示例文本");label->setFont(fontComboBox->currentFont());// 连接QFontComboBox的currentFontChanged信号以更新标签的字体QObject::connect(fontComboBox, &QFontComboBox::currentFontChanged, label, [=](const QFont &font) {    label->setFont(font);});// 将QFontComboBox和标签添加到布局中layout->addWidget(fontComboBox);layout->addWidget(label);// 设置窗口的布局window.setLayout(layout);// 设置窗口的大小window.resize(300, 200);// 显示窗口window.show();//QLineEdit// 创建一个QLineEdit用于文本输入QLineEdit *lineEdit = new QLineEdit;// 创建一个标签来显示输入的文本QLabel *label = new QLabel("输入的文本：");// 连接QLineEdit的textChanged信号以更新标签的文本QObject::connect(lineEdit, &QLineEdit::textChanged, label, &QLabel::setText);// 将QLineEdit和标签添加到布局中layout->addWidget(lineEdit);layout->addWidget(label);//QTextEdit// 创建一个QTextEdit用于多行文本输入和编辑QTextEdit *textEdit = new QTextEdit;//QPlainTextEdit// 创建一个QPlainTextEdit用于多行文本输入和编辑QPlainTextEdit *plainTextEdit = new QPlainTextEdit;//QSpinBox// 创建一个QSpinBox用于整数值输入QSpinBox *spinBox = new QSpinBox;// 设置QSpinBox的范围spinBox->setMinimum(0);spinBox->setMaximum(100);// 创建一个标签来显示选择的整数值QLabel *label = new QLabel("选择的值：");// 连接QSpinBox的valueChanged信号以更新标签的文本QObject::connect(spinBox, QOverload::of(&QSpinBox::valueChanged), [=](int value) {    label->setText("选择的值：" + QString::number(value));});

QT-For-Python1. Demo

self.ui.pushButton.setText("demo")lable=QLabel("Hello World!")lable.show()Signals and Slots：from PySide6.QtCore import Slot@Slot()def say_hello():    print("button")def function():    print("button")button = QPushButton("Click me")button.clicked.connect(say_hello)//functionbutton.show()

QT-Quick1. HelloWorld

//main.cpp:QQmlApplicationEngine engine;engine.load(QUrl(QStringLiteral("qrc:/qt/qml/qtquickapplication1/main.qml")));if (engine.rootObjects().isEmpty())    return -1;//main.qml:import QtQuick 2.9import QtQuick.Window 2.2import QtQuick.ControlsWindow {    visible: true    width: 640    height: 480    title: "HelloWorld"    Text:{        text:"HelloWorld"    }}

2. 简单表单

import QtQuick 2.15import QtQuick.Controls 2.15import QtQuick.Layouts 1.15ApplicationWindow {    visible: true    width: 400    height: 300    title: "Qt Quick App"    ColumnLayout {        spacing: 10        anchors.centerIn: parent        TextField {            id: nameField            placeholderText: "Enter your name"        }        RowLayout {            spacing: 10            RadioButton {                id: maleRadioButton                text: "Male"                checked: true                onClicked: femaleRadioButton.checked = false            }            RadioButton {                id: femaleRadioButton                text: "Female"                onClicked: maleRadioButton.checked = false            }        }        ComboBox {            id: countryComboBox            model: ["Country 1", "Country 2", "Country 3"]        }        TextArea {            id: commentsTextArea            placeholderText: "Enter your comments"            wrapMode: TextEdit.Wrap            height: 100        }        Button {            text: "Submit"            font.pixelSize: 16            Layout.columnSpan: 2            Layout.fillWidth: true            onClicked: {                var nameValue = nameField.text                var genderValue = maleRadioButton.checked ? "Male" : "Female"                var countryValue = countryComboBox.currentText                var commentsValue = commentsTextArea.text                console.log("Name: " + nameValue)                console.log("Gender: " + genderValue)                console.log("Country: " + countryValue)                console.log("Comments: " + commentsValue)                // 在这里可以将获取到的值进行进一步处理或提交到服务器            }        }    }}