Qt中的长按事件

我只是想知道在Qt
中是否有一个长新闻事件可用 当前正在使用的模块需要长按。我在C7中看到了卸载的长按

按钮点击事件和按钮按下事件给出相同的结果，对吗

阿尔法

您可以使用

keyPressEvent ( QKeyEvent * event )

及

---

对于长按事件的处理

您可以查看Qt，
我想，你所追求的手势应该是这样的。

如果你不想使用这种手势，那么快速、简单、老式的方法是这样的：

在标题中声明一个毫秒时间戳以保存上次按下的时间

private:
    // Remembers the point in time when mouse button went down
    quint64 mLastPressTime=0;
    // Pressing and holding for one full second constitutes a "longpress", set whatever value in milliseconds you want here.
    static const quint64 MY_LONG_PRESS_THRESHOLD=1000; 
protected:
    // Declare that we are overriding QWidget's events for mouse press and release
    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;
signals:
    // Our custom signal to emit once a longpress is detected.
    void longPressEvent(QMouseEvent *);

在source中定义鼠标按下和释放处理程序，如下所示：

void MyClass::mousePressEvent(QMouseEvent *event)
{
    // Remeber last time mousr was pressed
    mLastPressTime=QDateTime::currentMSecsSinceEpoch();
}

void MyClass::mouseReleaseEvent(QMouseEvent *event)
{
    // Calculate for how long the button has been pressed upon release
    const quint64 pressTime = QDateTime::currentMSecsSinceEpoch() - mLastPressTime;
    // The press time exceeds our "threshold" and this constitutes a longpress
    if( pressTime > MY_LONG_PRESS_THRESHOLD){
        // We pass the original mouse event in case it is useful (it contains all sorts of goodies like mouse posittion, which button was pressed etc).
        emit longPressEvent(event);
    }
}

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注意：我没有编译这段代码，除了我头脑中的内置编译器，它有很多非传统的扩展。

你说的是按键（键盘）还是点击（鼠标）？这是桌面、symbian还是其他什么？每种情况下的答案可能不同。对不起，不清楚。是的，我说的是按键。我想知道是否有办法实现长按键。即如果我点击按钮一次，它做一个活动，如果我按两次，它做另一个活动。现在我想按住一段时间，开始另一项活动。对不起，不清楚。是的，我说的是按键。我想知道是否有办法实现长按键。即如果我点击按钮一次，它做一个活动，如果我按两次，它做另一个活动。现在我想按住一段时间，开始另一项活动。仅供参考：第二个链接已断开，并且。。。2017年的Qt4.x？这样做怎么样：这个：breadcrumbs:QT Quick 5有

void MyClass::mousePressEvent(QMouseEvent *event)
{
    // Remeber last time mousr was pressed
    mLastPressTime=QDateTime::currentMSecsSinceEpoch();
}

void MyClass::mouseReleaseEvent(QMouseEvent *event)
{
    // Calculate for how long the button has been pressed upon release
    const quint64 pressTime = QDateTime::currentMSecsSinceEpoch() - mLastPressTime;
    // The press time exceeds our "threshold" and this constitutes a longpress
    if( pressTime > MY_LONG_PRESS_THRESHOLD){
        // We pass the original mouse event in case it is useful (it contains all sorts of goodies like mouse posittion, which button was pressed etc).
        emit longPressEvent(event);
    }
}