【qt】左键菜单

qt 左键菜单

假设类是EditWinEdow

构造函数里，打开对应区域MenuPolicy

`ui->labMap->setContextMenuPolicy(Qt::CustomContextMenu);

在需要的地方连接信号槽

connect(ui->labMap, SIGNAL(customContextMenuRequested(const QPoint)), this, SLOT(onRightClickMenuRequested()));

在EditWinEdow.h中添加

enum RightClickTask{
    TASK_CHANGEVIEW = 1,
    TASK_SYSTEMSET = 2,
    TASK_PARAMSET = 3,
    TASK_DEVLIST = 4,
    TASK_ALARMRECORD = 5,
    TASK_MIN = 6,
    TASK_RESET = 7,
    TASK_EXIT = 8,
    TASK_DEVOPERATE = 9,
    TASK_ADD = 10
​
};

EditWinEdow.cpp添加对应函数，EditWinEdow.h中添加定义（这个略）

void EditWindow::onRightClickMenuRequested()
{
    std::unique_ptr<QMenu> pMenu(new QMenu(this));
    std::unique_ptr<QAction> pAddDevice(new QAction(tr("新建"), this));
    std::unique_ptr<QAction> pMinTask(new QAction(tr("最小化"), this));
    std::unique_ptr<QAction> pExitTask(new QAction(tr("退出"), this));
​
    pAddDevice->setData(RightClickTask::TASK_ADD);
    pMinTask->setData(RightClickTask::TASK_MIN);
    pExitTask->setData(RightClickTask::TASK_EXIT);
​
    pMenu->addAction(pAddDevice.get());
    pMenu->addAction(pMinTask.get());
    pMenu->addAction(pExitTask.get());
    connect(pAddDevice.get(), SIGNAL(triggered()), SLOT(onRightClickMenuEvent()));
    connect(pExitTask.get(), SIGNAL(triggered()), SLOT(onRightClickMenuEvent()));
    connect(pMinTask.get(), SIGNAL(triggered()), SLOT(onRightClickMenuEvent()));
    pMenu->exec(cursor().pos());
}
​

void EditWindow::onRightClickMenuEvent()
{
    QAction *pEven = qobject_cast<QAction *>(this->sender());//this->sender()就是发信号者 QAction
    //获取发送信息类型 1:添加 2:最小化 3:退出
    int iType = pEven->data().toInt();
​
    switch (iType)
    {
    case RightClickTask::TASK_ADD:
        mapAddDevice();
        break;
    case RightClickTask::TASK_MIN:
        WindowMin();
        break;
    case RightClickTask::TASK_EXIT:
        Exit();
        break;
    default:
        break;
    }
}

void EditWindow::mapAddDevice()
{
    //略
}
​
void EditWindow::WindowMin()
{
    this->showMinimized();
}
​
void EditWindow::Exit()
{
    this->close();
}