Qt TabWidget添加多个窗口窗体，可关闭与打开

点击按钮可判断是否打开，避免重复打开

使用Qt中的TabWidget组件创建一个简单的分页窗体布局。点击按钮时，会新增一个窗体并添加到TabWidget中。每个子窗体能动态获取父窗体指针以进行操作

分别创建一个mainwindow和两个widget窗体文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    void closeEvent(QCloseEvent* e);
    int IsOpened(QString title);

    QString GetTableNumber();
private slots:
    void on_pushButton_clicked();

    void on_tabWidget_tabCloseRequested(int index);

    void on_tabWidget_currentChanged(int index);

private:
    Ui::MainWindow *ui;
    int cur = 1;
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "form2.h"
#include "form3.h"
#include <QMessageBox>
#include <QPushButton>
#include <QToolButton>


MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->tabWidget->setVisible(true);
    ui->tabWidget->clear();//清除所有页面
    //ui->tabWidget->tabsClosable(); //Page有关闭按钮，可被关闭
    ui->tabWidget->setTabsClosable(true);

    QPushButton *btn1 = new QPushButton;
    btn1->setText("开始");
    btn1->setIcon(QIcon(":/new/prefix1/button_Log_icon2.ico"));

    // ui->toolBar->addWidget(btn1);
    QPushButton *btn2 = new QPushButton;
    btn2->setText("暂停");
    //  ui->toolBar->addWidget(btn2);
    QToolButton *tbtn = new QToolButton;
    tbtn->setText("复位");
    tbtn->setIcon(QIcon(":/new/prefix1/button_Log_icon2.ico"));
    tbtn->setToolButtonStyle(Qt::ToolButtonTextUnderIcon); //图像在上，文字在下
    ui->toolBar->addWidget(tbtn);

    QToolButton *tbtn2 = new QToolButton;
    tbtn2->setText("设置");
    tbtn2->setIcon(QIcon(":/new/prefix1/best_quality_2.png"));
    tbtn2->setToolButtonStyle(Qt::ToolButtonTextUnderIcon); //图像在上，文字在下
    ui->toolBar->addWidget(tbtn2);

    connect(tbtn,&QToolButton::clicked,this,[=]{
        Form2 *ptr =new Form2(this);//关闭时自动销毁
        ptr->setAttribute(Qt::WA_DeleteOnClose);
        Form3 *ptr3 =new Form3(this);//关闭时自动销毁
        ptr3->setAttribute(Qt::WA_DeleteOnClose);
        int tb_index =IsOpened(tbtn->text());
        if(tb_index>=0)
        {
            ui->tabWidget->setCurrentIndex(tb_index) ;
            return;
        }
        //  if(cur%2==0)
        {
            cur = ui->tabWidget->addTab(ptr,tbtn->text());//QString::asprintf("192.168.1.%d",ui->tabWidget->count()));
        }
        //  else
        {
            //cur = ui->tabWidget->addTab(ptr3,QString::asprintf("test%d",ui->tabWidget->count()));
        }


        ui->tabWidget->setTabIcon(cur,QIcon(":/new/prefix1/button_Log_icon2.ico"));
        ui->tabWidget->setCurrentIndex(cur) ;
    });
    connect(tbtn2,&QToolButton::clicked,this,[=]{
        Form2 *ptr =new Form2(this);//关闭时自动销毁
        ptr->setAttribute(Qt::WA_DeleteOnClose);
        Form3 *ptr3 =new Form3(this);//关闭时自动销毁
        ptr3->setAttribute(Qt::WA_DeleteOnClose);
        int tb_index =IsOpened(tbtn2->text());
        if(tb_index>=0)
        {
            ui->tabWidget->setCurrentIndex(tb_index) ;
            return;
        }
        //  if(cur%2==0)
        {
            //   cur = ui->tabWidget->addTab(ptr,QString::asprintf("192.168.1.%d",ui->tabWidget->count()));
        }
        //  else
        {
            cur = ui->tabWidget->addTab(ptr3,tbtn2->text());//QString::asprintf("test%d",ui->tabWidget->count()));
        }


        ui->tabWidget->setTabIcon(cur,QIcon(":/new/prefix1/best_quality_2.png"));
        ui->tabWidget->setCurrentIndex(cur) ;
    });




}

/**********************************************
* @projectName   %{CurrentProject:Name}
* @brief         function_name...
* @param         void
* @return        void
* @author        cdtxw@foxmail.com/ by txwtech
* @date          2024-09-05
**********************************************/

// 定义函数来获取当前Table名字
QString MainWindow::GetTableNumber()
{
    QString ref = QString(ui->tabWidget->currentIndex());
    return ref;
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::closeEvent(QCloseEvent* e)
{
    QMessageBox::information(this,"title","main window will be closed");
}

/**********************************************
* @projectName   %{CurrentProject:Name}
* @brief         是否打开
* @param         void
* @return        void
* @author        cdtxw@foxmail.com/ by txwtech
* @date          2024-09-05
**********************************************/

int MainWindow::IsOpened(QString title)
{
    int tab_count = ui->tabWidget->count();
    int window_count =0;
    if(window_count==0)
    {
        window_count = -1;
    }
    for(int x=0;x<tab_count;x++)//获取出每个菜单的标题
    {
        QString tab_name = ui->tabWidget->tabText(x);
        if(tab_name==title)
        {
            window_count = x;
            break;
        }
        else if(x==tab_count)
        {
            window_count = -1;
        }


    }
    return window_count;


}

/**********************************************
* @projectName   %{CurrentProject:Name}
* @brief         添加窗口
* @param         void
* @return        void
* @author        cdtxw@foxmail.com/ by txwtech
* @date          2024-09-05
**********************************************/


void MainWindow::on_pushButton_clicked()
{
    //新建选项卡
    Form2 *ptr =new Form2(this);//关闭时自动销毁
    ptr->setAttribute(Qt::WA_DeleteOnClose);
    Form3 *ptr3 =new Form3(this);//关闭时自动销毁
    ptr3->setAttribute(Qt::WA_DeleteOnClose);
    if(cur%2==0)
    {
        cur = ui->tabWidget->addTab(ptr,QString::asprintf("192.168.1.%d",ui->tabWidget->count()));
    }
    else
    {
        cur = ui->tabWidget->addTab(ptr3,QString::asprintf("test%d",ui->tabWidget->count()));
    }


    ui->tabWidget->setTabIcon(cur,QIcon(":/new/prefix1/button_Log_icon2.ico"));
    ui->tabWidget->setCurrentIndex(cur) ;
    ui->tabWidget->setVisible(true);

}


void MainWindow::on_tabWidget_tabCloseRequested(int index)
{
    if (index<0)
        return;
    auto aa= QMessageBox::question(this,"tips","window will be closed",QMessageBox::Yes,QMessageBox::No);
    if(aa==QMessageBox::No)
    {
        return;
    }
    QWidget* aForm=ui->tabWidget->widget(index);
    aForm->close();

}


void MainWindow::on_tabWidget_currentChanged(int index)//
// 在无Tab页面是默认禁用
{
    Q_UNUSED(index);
    bool en=ui->tabWidget->count()>0;
    // ui->tabWidget->setVisible(en);
}

工程代码：

https://download.csdn.net/download/txwtech/89715631