void AsyncScrollingCoordinator::scheduleUpdateScrollPositionAfterAsyncScroll(ScrollingNodeID nodeID, const FloatPoint& scrollPosition, bool programmaticScroll, SetOrSyncScrollingLayerPosition scrollingLayerPositionAction)
{
ScheduledScrollUpdate scrollUpdate(nodeID, scrollPosition, programmaticScroll, scrollingLayerPositionAction);
if (m_updateNodeScrollPositionTimer.isActive()) {
if (m_scheduledScrollUpdate.matchesUpdateType(scrollUpdate)) {
m_scheduledScrollUpdate.scrollPosition = scrollPosition;
return;
}
// If the parameters don't match what was previously scheduled, dispatch immediately.
m_updateNodeScrollPositionTimer.stop();
updateScrollPositionAfterAsyncScroll(m_scheduledScrollUpdate.nodeID, m_scheduledScrollUpdate.scrollPosition, m_scheduledScrollUpdate.isProgrammaticScroll, m_scheduledScrollUpdate.updateLayerPositionAction);
updateScrollPositionAfterAsyncScroll(nodeID, scrollPosition, programmaticScroll, scrollingLayerPositionAction);
return;
}
m_scheduledScrollUpdate = scrollUpdate;
m_updateNodeScrollPositionTimer.startOneShot(0);
}
void QAbstractKineticScrollerPrivate::handleMove(QMouseEvent *me, QPoint &delta)
{
Q_Q(QAbstractKineticScroller);
if (mode == QAbstractKineticScroller::AccelerationMode) {
// we need delta to be the delta to ipos, not pos in this case
delta = me->globalPos() - ipos;
}
if (axisLockThreshold) {
int dx = qAbs(delta.x());
int dy = qAbs(delta.y());
if (dx || dy) {
bool vertical = (dy > dx);
qreal alpha = qreal(vertical ? dx : dy) / qreal(vertical ? dy : dx);
qKSDebug() << "axis lock: " << alpha << " / " << axisLockThreshold << " - isvertical: " << vertical << " - dx: " << dx << " - dy: " << dy;
if (alpha <= axisLockThreshold) {
if (vertical)
delta.setX(0);
else
delta.setY(0);
}
}
}
switch (mode) {
case QAbstractKineticScroller::PushMode:
// Scroll by the amount of pixels the cursor has moved
// since the last motion event.
scrollUpdate(delta);
pos = me->globalPos();
break;
case QAbstractKineticScroller::AccelerationMode: {
// Set acceleration relative to the initial click
QSize size = q->viewportSize();
qreal signX = 0, signY = 0;
if (delta.x() < 0)
signX = -1;
else if (delta.x() > 0)
signX = 1;
if (delta.y() < 0)
signY = -1;
else if (delta.y() > 0)
signY = 1;
velocity.setX(signX * ((qreal(qAbs(delta.x())) / qreal(size.width()) * (maxVelocity - minVelocity)) + minVelocity));
velocity.setY(signY * ((qreal(qAbs(delta.y())) / qreal(size.height()) * (maxVelocity - minVelocity)) + minVelocity));
break;
}
case QAbstractKineticScroller::AutoMode:
QPointF newVelocity = calculateVelocity(delta, lastTime.elapsed());
QPoint maxPos = q->maximumScrollPosition();
bool alwaysOvershoot = (overshootPolicy == QAbstractKineticScroller::OvershootAlwaysOn);
if (!maxPos.x() && !alwaysOvershoot) {
delta.setX(0);
newVelocity.setX(0);
}
if (!maxPos.y() && !alwaysOvershoot) {
delta.setY(0);
newVelocity.setY(0);
}
velocity = newVelocity;
scrollUpdate(delta);
if (maxPos.x() || alwaysOvershoot)
pos.setX(me->globalPos().x());
if (maxPos.y() || alwaysOvershoot)
pos.setY(me->globalPos().y());
break;
}
}
