不按住鼠标按钮不接收 mouseMoveEvent

Question

我正在尝试实现悬停功能，当我将鼠标悬停在项目的特定区域时，我会重新绘制项目。

class TestItem : public QQuickItem
{
    Q_OBJECT

public:
    explicit TestItem(QQuickItem *parent = nullptr) : QQuickItem(parent)
    {
        setAcceptHoverEvents(true);
        setAcceptedMouseButtons(Qt::AllButtons);
    }

protected:
    // QQuickItem interface
    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE
    {
        qDebug() << "mouseMoveEvent()" << event->buttons() << event->x() << event->y();
    }

    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE
    {
        qDebug() << "mousePressEvent()" << event->buttons() << event->x() << event->y();
    }

    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE
    {
        qDebug() << "mouseReleaseEvent()" << event->buttons() << event->x() << event->y();
    }
};

但是，使用这个 class 当我将光标移到我的项目上时，我没有在终端上收到任何 "mouseMoveEvent()" 输出。它只在按住任何鼠标按钮时有效。

如何在不强制用户按住任何鼠标按钮的情况下实现这一点？

Answer 1

我自己可以解决，问题是我在监听错误的事件。正确的事件应该是 hoverMoveEvent().

使用以下 class，我得到了正确的输出：

class TestItem : public QQuickItem
{
    Q_OBJECT

public:
    explicit TestItem(QQuickItem *parent = nullptr) : QQuickItem(parent)
    {
        setAcceptHoverEvents(true);
    }

protected:
    // QQuickItem interface
    void hoverEnterEvent(QHoverEvent *event) Q_DECL_OVERRIDE
    {
        qDebug() << "hoverEnterEvent()" << event->posF();
    }

    void hoverMoveEvent(QHoverEvent *event) Q_DECL_OVERRIDE
    {
        qDebug() << "hoverMoveEvent()" << event->posF();
    }

    void hoverLeaveEvent(QHoverEvent *event) Q_DECL_OVERRIDE
    {
        qDebug() << "hoverLeaveEvent()" << event->posF();
    }
};

不按住鼠标按钮不接收 mouseMoveEvent

Not receiving mouseMoveEvent without holding mouse button

c++

qml

qt5

qtquick2