Qt Widgets——菜单和菜单栏

QMenu(QWidget * parent = 0)  
        QMenu(const QString & title, QWidget * parent = 0)  
        ~QMenu()  
  
QAction *   addAction(const QString & text)//添加动作  
QAction *   addAction(const QIcon & icon, const QString & text)  
QAction *   addAction(const QString & text, const QObject * receiver, const char * member, const QKeySequence & shortcut = 0)//尝试失败，求教const char * member该如何？  
QAction *   addAction(const QIcon & icon, const QString & text, const QObject * receiver, const char * member, const QKeySequence & shortcut = 0)  
void        addAction(QAction * action)  
  
QAction *   addMenu(QMenu * menu)//添加菜单  
QMenu *     addMenu(const QString & title)  
QMenu *     addMenu(const QIcon & icon, const QString & title)  
QAction *   insertMenu(QAction * before, QMenu * menu)  
  
QAction *   addSection(const QString & text)//  
QAction *   addSection(const QIcon & icon, const QString & text)  
  
QAction *   addSeparator()//添加分隔线  
  
QAction *   insertSection(QAction * before, const QString & text)  
QAction *   insertSection(QAction * before, const QIcon & icon, const QString & text)  
QAction *   insertSeparator(QAction * before)  
  
void        popup(const QPoint & p, QAction * atAction = 0)//该菜单在p坐标点弹出  
QAction *   exec()//该菜单在0,0 坐标出现，执行后阻塞程序，返回点击的动作或0(什么也没点，如按Esc键)  
QAction *   exec(const QPoint & p, QAction * action = 0)//上同，位置一般为：1，鼠标位置exec(QCursor::pos());2，与某部件对齐exec(somewidget.mapToGlobal  
  
(QPoint(0, 0)));3，通过QMouseEvent *e，exec(e->globalPos());  
void        hideTearOffMenu()  
void        clear()//清除菜单中的所有项  
  
void    setActiveAction(QAction * act)  
void    setAsDockMenu()  
void    setDefaultAction(QAction * act)  
void    setIcon(const QIcon & icon)  
void    setSeparatorsCollapsible(bool collapse)  
void    setTearOffEnabled(bool)  
void    setTitle(const QString & title)  
void    setToolTipsVisible(bool visible)  
  
QIcon       icon() const  
QAction *   defaultAction() const  
QString title() const  
NSMenu *    toNSMenu()  
bool    toolTipsVisible() const  
QAction *   actionAt(const QPoint & pt) const  
QRect       actionGeometry(QAction * act) const  
QAction *   activeAction() const  
bool        isEmpty() const  
bool        isTearOffEnabled() const  
bool        isTearOffMenuVisible() const  
QAction *   menuAction() const  
bool        separatorsCollapsible() const  

   QMenuBar(QWidget * parent = 0)  
        ~QMenuBar()  
QAction *   addMenu(QMenu * menu)//以下几个添加菜单的比较常用  
QMenu *     addMenu(const QString & title)  
QMenu *     addMenu(const QIcon & icon, const QString & title)  
  
void    setActiveAction(QAction * act)  
void    setCornerWidget(QWidget * widget, Qt::Corner corner = Qt::TopRightCorner)//在菜单条的最左或最右添加个小部件，corner可以为Qt::TopRightCorner（最右）或  
  
Qt::TopLeftCorner(最左)  
void    setDefaultAction(QAction * act)//只支持Windows Mobile，手机上的“左软键”  
void    setDefaultUp(bool)//默认false，菜单正常地下拉显示，如设成false,则菜单往上拉显示  
void    setNativeMenuBar(bool nativeMenuBar)//菜单本地化，只支持Mac OS X和Windows CE。我想，如ubuntu上，当窗口最大化时，菜单附着于最上一栏一样吧……（On t<span style="white-space:pre">        </span>hese platforms if this property is true, the menubar is used in the native menubar and is not in the window of its parent, if false the me<span style="white-space:pre">     </span>nubar remains in the window.On other platforms the value of this attribute has no effect.）  
void    clear()//清除所有action  
  
QWidget *   cornerWidget(Qt::Corner corner = Qt::TopRightCorner) const  
QAction *   defaultAction() const  
bool        isDefaultUp() const  
bool        isNativeMenuBar() const  
NSMenu *    toNSMenu()  
QAction *   actionAt(const QPoint & pt) const  
QRect       actionGeometry(QAction * act) const  
QAction *   activeAction() const  
  
QAction *   addAction(const QString & text)//以下四个添加动作或菜单，该动作将直接显示在菜单条上，感觉四个函数都比较让人无语，想不出官方添加它们的用意！  
QAction *   addAction(const QString & text, const QObject * receiver, const char * member)  
void        addAction(QAction * action)  
QAction *   insertMenu(QAction * before, QMenu * menu)  
  
QAction *   addSeparator()//在菜单条上添加分隔线，试了下，没看到效果，和以上四个一样让人无语  
QAction *   insertSeparator(QAction * before)  

#include "mainwindow.h"  
#include "ui_mainwindow.h"  
#include <QDebug>  
#include <QAction>  
#include <QPushButton>  
#include <QCursor>  
#include <QKeySequence>  
MainWindow::MainWindow(QWidget *parent) :  
    QMainWindow(parent),  
    ui(new Ui::MainWindow)  
{  
    ui->setupUi(this);  
  
    QMenu *menu1= new QMenu("hello");  
    menu1->addAction("菜单项1");  
    menu1->addAction("菜单项2");  
    if(QAction *act=menu1->exec(QCursor::pos()))  
    {  
        qDebug()<< act->text() <<"triggered";  
    }  
  
    file_menu=new QMenu("文件");  
    file_menu->addAction("打开");//可用返回的QAction 连接槽函数  
    //file_menu->addAction("退出",this,exit,QKeySequence("Ctrl+E"));//失败  
    file_menu->addSeparator();  
    file_menu->addSection("Section");//貌似无效果  
    file_menu->addMenu(menu1);  
    ui->menuBar->addMenu(file_menu);  
  
    QPushButton *btn=new QPushButton("hello");  
    ui->menuBar->setCornerWidget(btn,Qt::TopLeftCorner);  
    ui->menuBar->setDefaultUp(true);  
  
  
}  
  
MainWindow::~MainWindow()  
{  
    delete ui;  
}