qt之菜单的使用

     

       首先从QMainWindow 中派生一个类，名为QMain,然后在构造函数中创建菜单，，每个菜单都有QAction组成，而这些QAction中，可以设置图标，快捷键，当被选中时在状态栏显示的文字，当然最重要的是用connect将QAction的triggered信号和相应的槽连接起来。

  下面是代码

    qmain.h

       

      

#ifndef QMAIN_H

#define QMAIN_H

#include 

#include 

class QMain : public QMainWindow

{

    Q_OBJECT

public:

    explicit QMain(QWidget *parent = 0);

protected:

    void  createAction();

    void createMenu();

    void createToolBar();

signals:

public slots:

private:

    QAction* exitAction;

    QAction* openAction;

    QAction* addNoteAction;

    QAction* cutAction;

    QAction* copyAction;

    QAction* pasteAction;

    QMenu* fileMenu;

    QMenu* editMenu;

};

#endif // QMAIN_H

qmain.cpp

#include "qmain.h"

#include 

#include 

#include 

QMain::QMain(QWidget *parent) : QMainWindow(parent)

{

    createAction();

    createMenu();

   resize(500,600);

}

void  QMain::createAction()

{

    exitAction = new QAction(tr("E&xit"),this);

    exitAction->setIcon(QIcon(":/images/delete.png"));

    exitAction->setShortcut(tr("Ctrl+Q"));

    connect(exitAction,SIGNAL(triggered(bool)),this,SLOT(close()));

    openAction = new QAction("&Open",this);

    openAction->setShortcut(QKeySequence::Open);

    openAction->setStatusTip(tr("open"));

   addNoteAction = new QAction(tr("node"),this);

   addNoteAction->setIcon(QIcon(tr(":/images/node.png")));

   addNoteAction->setStatusTip(tr("add node"));

    cutAction = new  QAction(tr("&Cut"),this);

    cutAction->setIcon(QIcon(tr(":/images/cut.png")));

    cutAction->setShortcut(QKeySequence::Cut);

    cutAction->setStatusTip(tr("cut Text"));

     copyAction = new QAction(tr("&Copy"),this);

     copyAction->setIcon(QIcon(tr(":/images/copy.png")));

     copyAction->setShortcut(QKeySequence::Copy);

     pasteAction = new QAction(tr("&Paste"),this);

     pasteAction->setIcon(QIcon(":/images/paste.png"));

     pasteAction->setShortcut(QKeySequence::Paste);

     pasteAction->setStatusTip(tr("paste text"));

}

void QMain::createMenu()

{

 fileMenu = menuBar()->addMenu("&File");

 fileMenu->addAction(exitAction);

 editMenu = menuBar()->addMenu("&Edit");

editMenu->addAction(addNoteAction);

editMenu->addAction(cutAction);

editMenu->addAction(pasteAction);

editMenu->addAction(openAction);

}

void QMain::createToolBar()

{

}

main.cpp:

    

#include 
#include 


int main(int argc,char* argv[])
{
    QApplication app(argc,argv);
    QMain* ma = new QMain;
    ma->show();
    return app.exec();
}