QT 菜单程序

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MainWindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include<QMainWindow>#include<QMessageBox>class MainWindow : public QMainWindow{    Q_OBJECTpublic:    MainWindow();private slots:    void fExit();    void iInfo();private:    void createMenus();    void createActions();    QAction *exit;    QAction *info;    QMenu *file;    QMenu *about;    QMessageBox *msgBox;};#endif // MAINWINDOW_H

MainWindow.cpp

#include<QtGui>#include"MainWindow.h"MainWindow::MainWindow(){    QWidget *widget=new QWidget;    setCentralWidget(widget);    QWidget *topfiller=new QWidget;    topfiller->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding);    QWidget *bottomFiller=new QWidget;    bottomFiller->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding);    createActions();    createMenus();    QVBoxLayout *layout=new QVBoxLayout;    layout->addWidget(topfiller);    layout->addWidget(bottomFiller);    widget->setLayout(layout);    setWindowTitle(tr("Main Window"));    resize(512,480);}void MainWindow::createActions(){    exit=new QAction(tr("Exit"),this);    exit->setShortcut(QKeySequence::Close);    connect(exit,SIGNAL(triggered()),this,SLOT(fExit()));    info =new QAction(tr("Info"),this);    info->setShortcut(QKeySequence::HelpContents);    connect(info,SIGNAL(triggered()),this,SLOT(iInfo()));}void MainWindow::createMenus(){    file=menuBar()->addMenu(tr("File"));    file->addAction(exit);    about=menuBar()->addMenu(tr("About"));    about->addAction(info);}void MainWindow::fExit(){    MainWindow::close();}void MainWindow::iInfo(){    msgBox=new QMessageBox;    msgBox->setText(tr("hello world"));    msgBox->setIcon(QMessageBox::Question);    msgBox->setStandardButtons(QMessageBox::Ok);    msgBox->exec();}

Main.cpp

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

运行效果：