// with only the distance past bounds exposed :
property bool needRefresh: false
property bool resting: verticalDistancePastBounds === 0
property bool threshold: 50
signal refresh
onVerticalDistancePastBoundsChanged: {
    if (verticalDistancePastBounds !== 0)
        needRefresh = verticalDistancePastBounds >= threshold;
}
onRestingChanged: {
    if (!resting && needRefresh)
        refresh();
    needRefresh = false;
}
 
// with a released signal :
property bool resting: verticalDistancePastBounds === 0
property bool threshold: 50
signal refresh
//flickable should have a released signal or overshootReleased or whatever
onReleased: if (verticalDistancePastBounds >= threshold) refresh() // pre-requisite : the distance past bounds should be reseted after the signal is emitted, not before
// this could similarly be done with a lastVerticalDistancePastBounds  property that is not reseted on mouse release
// onRestingChanged: if (lastVerticalDistancePastBounds >= threshold) refresh()