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plugin-volume: add support for hires wheel #1856

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plugin-volume: add support for hires wheel #1856

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17 changes: 15 additions & 2 deletions plugin-volume/volumepopup.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -197,8 +197,21 @@ void VolumePopup::openAt(QPoint pos, Qt::Corner anchor)

void VolumePopup::handleWheelEvent(QWheelEvent *event)
{
m_volumeSlider->setSliderPosition(m_volumeSlider->sliderPosition()
+ (event->angleDelta().y() / QWheelEvent::DefaultDeltasPerStep * m_volumeSlider->singleStep()));
// With a hig res mouse wheel, event->angleDelta().y() may be
// less than QWheelEvent::DefaultDeltasPerStep, so we need to
// accomulate the fraction between each handleWheelEvent call.
// We can declare it static, because even if it would another
// instance of VolumePopup, this would impact onlythe start
// of the strokes.
static int fractionalAngleDelta = 0;

fractionalAngleDelta += event->angleDelta().y();
if (fractionalAngleDelta / QWheelEvent::DefaultDeltasPerStep != 0) {
m_volumeSlider->setSliderPosition(m_volumeSlider->sliderPosition()
+ (fractionalAngleDelta / QWheelEvent::DefaultDeltasPerStep *
m_volumeSlider->singleStep()));
fractionalAngleDelta %= QWheelEvent::DefaultDeltasPerStep;
}
}

void VolumePopup::setDevice(AudioDevice *device)
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