CODEWITHSUNDEEP
qtscrollmouse
Frank
Frank

Reputation: 2696

Scroll event detection in qt

How do I detect a scroll event in a Qt widget?.
I want to use it to scroll a QWT plot. I have tried using a QMouseEvent, but I could only find options for movement and pressing/releasing the mouse.

Upvotes: 11

Views: 17084

Answers (2)

developer0hye
developer0hye

Reputation: 443

If you use vertical wheel mouse, you can catch wheel up or wheel down event using the below function. If you use horizontal wheel mouse, check ev->angleDelta().x() value!

void wheelEvent(QWheelEvent *ev)
{
    if(ev->angleDelta().y() > 0) // up Wheel
        action1();
    else if(ev->angleDelta().y() < 0) //down Wheel
        action2();
}

Upvotes: 10

cmannett85
cmannett85

Reputation: 22346

void QWidget::wheelEvent(QWheelEvent* event) will be what you are after (docs here).

Upvotes: 23

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