Dialog 关于对话框问题对话框文件对话框模态和非模态对话框

深碍√TFBOYSˉ_ 2021-11-23 04:46 451阅读 0赞

![20190725210837432.png][]

#ifndef MAINWINDOW_H
    #define MAINWINDOW_H
    
    #include <QMainWindow>
    #include <QDialog>
    class MainWindow : public QMainWindow
    {
        Q_OBJECT
    
    public:
        MainWindow(QWidget *parent = 0);
        ~MainWindow();
    
        QDialog dlg;
    };
    
    #endif // MAINWINDOW_H

![20190725210906548.png][]

#include "mainwindow.h"
    #include <QMenuBar> //菜单栏
    #include <QMenu> //菜单
    #include <QAction>
    #include <QDialog>
    #include <QDebug>
    #include <QMessageBox>
    #include <QFileDialog>
    MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
    {
        QMenuBar *mBar = menuBar();
        setMenuBar(mBar);
        QMenu *menu = mBar ->addMenu("对话框");
    
       QAction *p1 = menu -> addAction("模态对话框");
       //Lamda表达式，信号处理
        connect(p1,&QAction::triggered,
                [=]()
                 {
                    QDialog dlg;
                    dlg.exec(); //等着用户操作，才会执行
                    qDebug() << "111111111";
                  }
    
                    );
    
        QAction *p2 = menu -> addAction("非模态对话框");
         // Lamda表达式，信号处理
        connect(p2,&QAction::triggered,
                [=]()
                 {
                    dlg.show();
                    qDebug() << "111111111";
                  }
    
                    );
    
        QAction *p3 = menu -> addAction("关于对话框");
         //Lamda表达式，信号处理
        connect(p3,&QAction::triggered,
                [=]()
                 {
                   QMessageBox::about(this,"about","关于qt");
                  }
                    );
    
        QAction *p4 = menu -> addAction("问题对话框");
          //Lamda表达式，信号处理
        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");
          //Lamda表达式，信号处理
        connect(p5,&QAction::triggered,
                [=]()
                 {
                QString path = QFileDialog::getOpenFileName(
                               this,
                               "open",
                               "../",
                          "source(*.cpp *.h);;Text(*.txt);;all(*.*)"
                               );
                    qDebug() << path;
                  }
                    );
    }
    
    
    MainWindow::~MainWindow()
    {
    
    }

![20190725211010783.png][]

#include "mainwindow.h"
    #include <QApplication>
    
    int main(int argc, char *argv[])
    {
        QApplication a(argc, argv);
        MainWindow w;
        w.show();
    
        return a.exec();
    }

### 效果： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pzMTM0MjA4NDc3Ng_size_16_color_FFFFFF_t_70][]            ![20190725211242543.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pzMTM0MjA4NDc3Ng_size_16_color_FFFFFF_t_70 1][]

[20190725210837432.png]: /images/20211122/7cf1fcaa1d2a403fa08c171da830da16.png
[20190725210906548.png]: /images/20211122/99333808eee441888b86b4ae73c4e5f0.png
[20190725211010783.png]: /images/20211122/eb0ddd0af6b64660ac4807fdfbf564d8.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pzMTM0MjA4NDc3Ng_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/2019072521121338.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pzMTM0MjA4NDc3Ng==,size_16,color_FFFFFF,t_70
[20190725211242543.png]: /images/20211122/bb0fd103cf0c425f89c1151a4e690981.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pzMTM0MjA4NDc3Ng_size_16_color_FFFFFF_t_70 1]: /images/20211122/72f629568b594417aaf668996bd5ffbc.png