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 <QMainWindow>

#include <QAction>

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 <QMenuBar>
#include <QIcon>
#include <QApplication>
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 <QApplication>#include <qmain.h>int main(int argc,char* argv[]){    QApplication app(argc,argv);    QMain* ma = new QMain;    ma->show();    return app.exec();}