Qt Widgets——动作类与小部件菜单项

 QWidgetAction(QObject * parent)  
virtual ~QWidgetAction()  
QWidget *   defaultWidget() const  
void    releaseWidget(QWidget * widget)  
QWidget *   requestWidget(QWidget * parent)  
void    setDefaultWidget(QWidget * widget)//主要用这个设置自定义部件 

   QActionGroup(QObject * parent)  
    ~QActionGroup()  
QList<QAction *>  actions() const  
QAction *   addAction(QAction * action)//返回的是原action  
QAction *   addAction(const QString & text)  
QAction *   addAction(const QIcon & icon, const QString & text)  
QAction *   checkedAction() const//返回当前被选中的action  
bool    isEnabled() const  
bool    isExclusive() const  
bool    isVisible() const  
void    removeAction(QAction * action)  

#include "mainwindow.h"  
#include "ui_mainwindow.h"  
#include <QListWidget>  
#include <QWidgetAction>  
#include <QAction>  
#include <QMenu>  
#include <QIcon>  
#include <QKeySequence>  
MainWindow::MainWindow(QWidget *parent) :  
    QMainWindow(parent),  
    ui(new Ui::MainWindow)  
{  
    ui->setupUi(this);  
    menu=new QMenu("菜单");  
    menu->addAction("子菜单");  
//QAction  
    ac1=new QAction(this);  
    ac1->setText("setText");  
    //ac1->setSeparator(true);  
    ac1->setStatusTip("setStatusTip");  
    ac1->setToolTip("setToolTip");  
    ac1->setWhatsThis("setWhatsThis");  
    ac1->setIcon(QIcon("://tray.ico"));  
    ac1->setIconText("setIconText");  
    ac1->setMenu(menu);  
    ac1->setCheckable(true);  
    ac1->setData(QString("setData"));  
    ac1->setPriority(QAction::HighPriority);  
    ac1->setShortcut(QKeySequence(tr("Ctrl+P")));  
  
    ui->mainToolBar->addAction(ac1);  
//QActionGroup  
    main_ac1=new QAction("左对齐",this);//创建动作  
    main_ac2=new QAction("右对齐",this);  
    main_ac3=new QAction("居中对齐",this);  
    main_ac1->setCheckable(true);//设置是否可选中  
    main_ac2->setCheckable(true);  
    main_ac3->setCheckable(true);  
    QActionGroup *alignmentGroup = new QActionGroup(this);  
    alignmentGroup->addAction(main_ac1);//将动作加入组  
    alignmentGroup->addAction(main_ac2);  
    alignmentGroup->addAction(main_ac3);  
    main_ac2->setChecked(true);//设置一个默认选中的  
  
    QActionGroup *Group = new QActionGroup(this);  
    QAction *ac_1 = Group->addAction("粗体");  
    QAction *ac_2 = Group->addAction("倾斜");  
    ac_1->setCheckable(true);  
    ac_2->setCheckable(true);  
    Group->setExclusive(false);  
    //connect(ac,SIGNAL(triger)……  
  
    QMenu *menu2=new QMenu("设置",this);  
    menu2->addAction(main_ac1);//将动作加入菜单  
    menu2->addAction(main_ac2);  
    menu2->addAction(main_ac3);  
    menu2->addAction(ac_1);  
    menu2->addAction(ac_2);  
    ui->menuBar->addMenu(menu2);  
  
//QWidgetAction  
    //构建个自定义小部件  
    QListWidget *lw=new QListWidget;  
    lw->addItem("列表项1");  
    lw->addItem("列表项2");  
    lw->addItem("列表项3");  
    //将部件加入QWidgetAction  
    QWidgetAction *a1=new QWidgetAction(this);  
    a1->setDefaultWidget(lw);  
    //将QWidgetAction加入到QMenu  
    QMenu *menu3=new QMenu(this);  
    menu3->addAction(a1);  
    //建立托盘图标,将QMenu加入到托盘图标右键菜单中  
    QIcon icon("://tray.ico");  
    trayIcon = new QSystemTrayIcon(this);  
    trayIcon->setIcon(icon);  
    trayIcon->setContextMenu(menu3);  
    trayIcon->setVisible(true);  
}  
  
MainWindow::~MainWindow()  
{  
    delete ui;  
}