QT学习笔记（四）各种对话框的创建

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

MainWindow(QWidget *parent = 0);

~MainWindow();

};

#endif // MAINWINDOW_H

#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();

setMenuBar(mbar);

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()<<"1111";

}

);

QAction *p2 = menu->addAction("关于对话框");

connect(p2,&QAction::triggered,

[=]()

{

QMessageBox::about(this,"about","关于QT");

}

);

QAction *p3 = menu->addAction("问题对话框");

connect(p3,&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 *p4 = menu->addAction("文件对话框");

connect(p4,&QAction::triggered,

[=]()

{

QString path = QFileDialog::getOpenFileName(this,"open","../","souce(*.cpp *.h);;Text(*.text);;all(*.*)");

qDebug()<<path;

}

);

}

MainWindow::~MainWindow()

{

}

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

MainWindow w;

w.show();

return a.exec();

}