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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_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic: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