C++Qt不用Qt工程师，用QStackedWidget完整代码实现在主窗口中用点击菜单进行三个子窗口之间进行切换，并且保证各个窗口之间不会产生冲突

以下是一个使用 QStackedWidget 实现在主窗口中切换子窗口的示例代码：

mainwindow.h：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QStackedWidget>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_menu1_triggered();
    void on_menu2_triggered();
    void on_menu3_triggered();

private:
    QStackedWidget *stackedWidget;
};

#endif // MAINWINDOW_H

mainwindow.cpp：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMenuBar>
#include <QMenu>
#include <QAction>
#include <QWidget>
#include <QHBoxLayout>
#include <QLabel>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    // 创建菜单栏
    QMenuBar *menuBar = new QMenuBar(this);
    setMenuBar(menuBar);

    // 创建菜单
    QMenu *menu1 = new QMenu("窗口1", this);
    QMenu *menu2 = new QMenu("窗口2", this);
    QMenu *menu3 = new QMenu("窗口3", this);
    menuBar->addMenu(menu1);
    menuBar->addMenu(menu2);
    menuBar->addMenu(menu3);

    // 创建菜单项
    QAction *action1_1 = new QAction("显示窗口1", this);
    QAction *action1_2 = new QAction("显示窗口2", this);
    QAction *action1_3 = new QAction("显示窗口3", this);
    QAction *action2_1 = new QAction("显示窗口1", this);
    QAction *action2_2 = new QAction("显示窗口2", this);
    QAction *action2_3 = new QAction("显示窗口3", this);
    QAction *action3_1 = new QAction("显示窗口1", this);
    QAction *action3_2 = new QAction("显示窗口2", this);
    QAction *action3_3 = new QAction("显示窗口3", this);
    menu1->addAction(action1_1);
    menu1->addAction(action1_2);
    menu1->addAction(action1_3);
    menu2->addAction(action2_1);
    menu2->addAction(action2_2);
    menu2->addAction(action2_3);
    menu3->addAction(action3_1);
    menu3->addAction(action3_2);
    menu3->addAction(action3_3);

    // 连接菜单项的点击事件
    connect(action1_1, &QAction::triggered, this, &MainWindow::on_menu1_triggered);
    connect(action1_2, &QAction::triggered, this, &MainWindow::on_menu2_triggered);
    connect(action1_3, &QAction::triggered, this, &MainWindow::on_menu3_triggered);
    connect(action2_1, &QAction::triggered, this, &MainWindow::on_menu1_triggered);
    connect(action2_2, &QAction::triggered, this, &MainWindow::on_menu2_triggered);
    connect(action2_3, &QAction::triggered, this, &MainWindow::on_menu3_triggered);
    connect(action3_1, &QAction::triggered, this, &MainWindow::on_menu1_triggered);
    connect(action3_2, &QAction::triggered, this, &MainWindow::on_menu2_triggered);
    connect(action3_3, &QAction::triggered, this, &MainWindow::on_menu3_triggered);

    // 创建 QStackedWidget
    stackedWidget = new QStackedWidget(this);
    setCentralWidget(stackedWidget);

    // 创建三个子窗口
    QWidget *widget1 = new QWidget(this);
    QHBoxLayout *layout1 = new QHBoxLayout(widget1);
    layout1->addWidget(new QLabel("窗口1", widget1));
    widget1->setLayout(layout1);
    stackedWidget->addWidget(widget1);

    QWidget *widget2 = new QWidget(this);
    QHBoxLayout *layout2 = new QHBoxLayout(widget2);
    layout2->addWidget(new QLabel("窗口2", widget2));
    widget2->setLayout(layout2);
    stackedWidget->addWidget(widget2);

    QWidget *widget3 = new QWidget(this);
    QHBoxLayout *layout3 = new QHBoxLayout(widget3);
    layout3->addWidget(new QLabel("窗口3", widget3));
    widget3->setLayout(layout3);
    stackedWidget->addWidget(widget3);
}

MainWindow::~MainWindow()
{
}

void MainWindow::on_menu1_triggered()
{
    stackedWidget->setCurrentIndex(0);
}

void MainWindow::on_menu2_triggered()
{
    stackedWidget->setCurrentIndex(1);
}

void MainWindow::on_menu3_triggered()
{
    stackedWidget->setCurrentIndex(2);
}

在这个示例中，我们首先创建了一个菜单栏和三个菜单，每个菜单下面有三个菜单项。然后我们创建了一个 QStackedWidget，并将其设置为主窗口的中央部件。接下来，我们创建了三个 QWidget 子窗口，并将它们添加到 QStackedWidget 中。最后，我们连接了菜单项的点击事件，并在点击时设置 QStackedWidget 的当前索引以切换窗口。