[QT] Common dialog box QDialog

This article lists 5 types of dialogs: modal dialogs, non-modal dialogs, about dialogs, question dialogs, and file dialogs.

#include "mainwindow.h"
#include<QMenu>
#include<QMenuBar>
#include<QAction>
#include<QDialog>
#include<QDebug>
#include<QMessageBox>
#include<QFileDialog>
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    
    
    QMenuBar *mBar = menuBar();
    QMenu *menu = mBar->addMenu("对话框");

    QAction *p1 = menu->addAction("模态对话框");
    connect(p1,&QAction::triggered,
            []()
            {
    
    
                QDialog dlg;
                dlg.exec();
                qDebug()<<"1111111";
            }
            );

    QAction *p2 = menu->addAction("非模态对话框");
    connect(p2,&QAction::triggered,
            [=]()
            {
    
    
               // dlg.show();  //常用方式
               //qDebug()<<"1111111";
                QDialog *p = new QDialog;
                p->setAttribute(Qt::WA_DeleteOnClose); //窗口关闭自动释放内存
                p->show();
            }
            );

    QAction *p3 = menu->addAction("关于对话框");
    connect(p3,&QAction::triggered,
            [=]()
            {
    
    
                QMessageBox::about(this,"关于对话框","关于qt");
            }
            );

    QAction *p4 = menu->addAction("问题对话框");
    connect(p4,&QAction::triggered,
            [=]()
            {
    
    
               int ret = QMessageBox::question(this,"question","Are you ok?");
               switch (ret)
               {
    
    
                    case QMessageBox::Yes:
                        qDebug()<<"I am ok"; break;
                    case QMessageBox::No:
                        qDebug()<<"I am bad";break;
                    default:
                           break;
               }
            }
            );

    QAction *p5 = menu->addAction("文件对话框");
    connect(p5,&QAction::triggered,
            [=]()
            {
    
    
                QString path = QFileDialog::getOpenFileName(this,"打开","../",
                                                            "souce(*.cpp *.h);;Text(*.txt);;all(*.*)");
                qDebug()<<path;
            }
            );
}

MainWindow::~MainWindow()
{
    
    

}