Right click menu of QT

QWidget And inheriting its class Qt Class by using void setContextMenuPolicy(Qt::ContextMenuPolicy) Enumeration settings right-click menu ,Qt::ContextMenuPolicy The enumeration of includes NoContextMenu,DefaultContextMenu,ActionsContextMenu,CustomContextMenu,PreventContextMenu Five types .

enumeration	type
Qt:：NoContextMenu	Part right-click menu , The processing of the right-click menu will be transferred to the parent of the part .
Qt:：PreventContextMenu	There is no right-click menu for components , And NoContextMenu contrary , Processing is not deferred to the parent of the part . This means that all right mouse button events are guaranteed to pass QWidget:：MousePresseEvent（） and QWidget:：mouseReleaseEvent（） Passed to the widget itself .
Qt:：DefaultContextMenu	Call the... Of the part QWidget:：contextMenuEvent（） The handler .
Qt:：ActionsContextMenu	The component will QWidget:：actions（） Display as context menu .
Qt:：CustomContextMenu	Components send QWidget:：customContextMenuRequested（） The signal .

DefaultContextMenu Use

Set up DefaultContextMenu After the type , Rewritable contextMenuEvent(QContextMenuEvent *event) event , Call menu

void ZPushButton::contextMenuEvent(QContextMenuEvent *event)
{
    
    QMenu *mpMenu = new QMenu(this);
    QAction* m_actionOne = new QAction(this);
    QAction* m_actionTwo = new QAction(this);
    QAction* m_actionThree = new QAction(this);

    m_actionOne->setText("ActionOne");
    m_actionTwo->setText("ActionTwo");
    m_actionThree->setText("ActionThree");

    mpMenu->addAction(m_actionOne);
    mpMenu->addAction(m_actionTwo);
    mpMenu->addAction(m_actionThree);
    mpMenu->exec(QCursor::pos());// Displays... At the current mouse position 
}

ActionsContextMenu Use

Use Qt::ActionsContextMenu, Add... Directly to the class QAction

    setContextMenuPolicy(Qt::ActionsContextMenu);
    QAction* m_actionOne = new QAction(this);
    QAction* m_actionTwo = new QAction(this);
    QAction* m_actionThree = new QAction(this);
    
    m_actionOne->setText("ActionOne");
    m_actionTwo->setText("ActionTwo");
    m_actionThree->setText("ActionThree");
    
    addAction(m_actionOne);
    addAction(m_actionTwo);
    addAction(m_actionThree); 
    
	connect(m_actionOne, SIGNAL(triggered()), this, SLOT(actionOneSlot()));
	connect(m_actionTwo, SIGNAL(triggered()), this, SLOT(actionTwoSlot()));
	connect(m_actionThree, SIGNAL(triggered()), this, SLOT(actionThreeSlot()));

Add the above code to the constructor of the form part , You can call the right-click menu .

CustomContextMenu Use

	setContextMenuPolicy(Qt::ContextMenuPolicy::CustomContextMenu);
    connect(this,&ZPushButton::customContextMenuRequested,[this](const QPoint &pos){
    
        qDebug()<<"pos:"<<pos;
        QMenu *mpMenu = new QMenu(this);
        QAction* m_actionOne = new QAction(this);
        QAction* m_actionTwo = new QAction(this);
        QAction* m_actionThree = new QAction(this);

        m_actionOne->setText("ActionOne");
        m_actionTwo->setText("ActionTwo");
        m_actionThree->setText("ActionThree");

        mpMenu->addAction(m_actionOne);
        mpMenu->addAction(m_actionTwo);
        mpMenu->addAction(m_actionThree);
        mpMenu->exec(QCursor::pos());// Displays... At the current mouse position 
    });