Dial: add missing wheel handling

[ChangeLog][Controls][Dial] Added support for wheel handling when
wheelEnabled is set to true.

Change-Id: If0bc2f0ea9d7cde7726739cdfdbd795c908981f0
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/quicktemplates2/qquickdial.cpp b/src/quicktemplates2/qquickdial.cpp
index 79aff781..2b9f83a4 100644
--- a/src/quicktemplates2/qquickdial.cpp
+++ b/src/quicktemplates2/qquickdial.cpp
@@ -606,6 +606,20 @@ void QQuickDial::mouseUngrabEvent()
     setPressed(false);
 }
 
+void QQuickDial::wheelEvent(QWheelEvent *event)
+{
+    Q_D(QQuickDial);
+    QQuickControl::wheelEvent(event);
+    if (d->wheelEnabled) {
+        const qreal oldValue = d->value;
+        const QPointF angle = event->angleDelta();
+        const qreal delta = (qFuzzyIsNull(angle.y()) ? angle.x() : angle.y()) / QWheelEvent::DefaultDeltasPerStep;
+        const qreal step = qFuzzyIsNull(d->stepSize) ? 0.1 : d->stepSize;
+        setValue(oldValue + step * delta);
+        event->setAccepted(!qFuzzyCompare(d->value, oldValue));
+    }
+}
+
 void QQuickDial::mirrorChange()
 {
     QQuickControl::mirrorChange();