Qt 小记

1. MenuPopup效果

              

   

QToolButton* arrange = new QToolButton;
    QPixmap arrangeIcon = QPixmap(QStringLiteral(":/image/res/tabmenu_graph_peilie.png"));
    arrange->setObjectName("TabMenuBeginMapArrange");
    arrange->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
    arrange->setIcon(arrangeIcon);
    arrange->setIconSize(arrangeIcon.size());
    arrange->setText("排列");
    QString arrangeTool = "<H4>排列</H4>\n\n&nbsp;&nbsp;通过更改页面上对象的顺序、位置和旋转来对其进行排列。"
            "\n\n&nbsp;&nbsp;您也可以将多个对象组合在一起，以便将它们作为单个对象处理。";
    QString arrangeStatus = "set arrange";
    arrange->setToolTip(arrangeTool);
    arrange->setStatusTip(arrangeStatus);
    QMenu* arrangeMenu = new QMenu(arrange);
    QAction* act = new QAction(QIcon(QStringLiteral(":/image/res/tabmenu_graph_top.png")),QStringLiteral("置于顶层(&R)"),arrangeMenu);
    connect(act, SIGNAL(triggered()), this, SLOT(NewPage()));
    arrange->setDefaultAction(act);
    arrangeMenu->addAction(act);
    act = new QAction(QIcon(QStringLiteral(":/image/res/tabmenu_graph_buttom.png")),QStringLiteral("置于低层(&K)"),arrangeMenu);
    connect(act, SIGNAL(clicked()), this, SLOT(NewPage()));
    arrangeMenu->addAction(act);
    act = new QAction(QIcon(QStringLiteral(":/image/res/tabmenu_graph_up.png")),QStringLiteral("上移一层(&F)"),arrangeMenu);
    connect(act, SIGNAL(clicked()), this, SLOT(NewPage()));
    arrangeMenu->addAction(act);
    act = new QAction(QIcon(QStringLiteral(":/image/res/tabmenu_graph_down.png")),QStringLiteral("下移一层(&B)"),arrangeMenu);
    connect(act, SIGNAL(clicked()), this, SLOT(NewPage()));
    arrangeMenu->addAction(act);
    arrange->setMenu(arrangeMenu);    

    arrange->setPopupMode(QToolButton::MenuButtonPopup );

 2. 激发paintEvent 

　　

setAttribute(Qt::WA_Hover, true);

3. 获取窗口大小的时机

    当第一次收到event是QEvent::WindowActivate的时候。

4. Qt 

QT_BEGIN_NAMESPACE
http://qt-project.org/wiki/Qt-In-Namespace