void ScrollView::startAutoScroll(const Vec2& deltaMove, float timeInSec, bool attenuated)
{
Vec2 adjustedDeltaMove = flattenVectorByDirection(deltaMove);
_autoScrolling = true;
_autoScrollTargetDelta = adjustedDeltaMove;
_autoScrollAttenuate = attenuated;
_autoScrollStartPosition = _innerContainer->getPosition();
_autoScrollTotalTime = timeInSec;
_autoScrollAccumulatedTime = 0;
_autoScrollBraking = false;
_autoScrollBrakingStartPosition = Vec2::ZERO;
// If the destination is also out of boundary of same side, start brake from beginning.
Vec2 currentOutOfBoundary = getHowMuchOutOfBoundary();
if (!fltEqualZero(currentOutOfBoundary))
{
_autoScrollCurrentlyOutOfBoundary = true;
Vec2 afterOutOfBoundary = getHowMuchOutOfBoundary(adjustedDeltaMove);
if(currentOutOfBoundary.x * afterOutOfBoundary.x > 0 || currentOutOfBoundary.y * afterOutOfBoundary.y > 0)
{
_autoScrollBraking = true;
}
}
}
void ScrollView::moveInnerContainer(const Vec2& deltaMove, bool canStartBounceBack)
{
Vec2 adjustedMove = flattenVectorByDirection(deltaMove);
setInnerContainerPosition(getInnerContainerPosition() + adjustedMove);
Vec2 outOfBoundary = getHowMuchOutOfBoundary();
updateScrollBar(outOfBoundary);
if(_bounceEnabled && canStartBounceBack)
{
startBounceBackIfNeeded();
}
}
void ListView::startAttenuatingAutoScroll(const Vec2& deltaMove, const Vec2& initialVelocity)
{
Vec2 adjustedDeltaMove = deltaMove;
if(!_items.empty() && _magneticType != MagneticType::NONE)
{
adjustedDeltaMove = flattenVectorByDirection(adjustedDeltaMove);
// If the destination is out of boundary, do nothing here. Because it will be handled by bouncing back.
if(getHowMuchOutOfBoundary(adjustedDeltaMove) == Vec2::ZERO)
{
MagneticType magType = _magneticType;
if(magType == MagneticType::BOTH_END)
{
if(_direction == Direction::HORIZONTAL)
{
magType = (adjustedDeltaMove.x > 0 ? MagneticType::LEFT : MagneticType::RIGHT);
}
else if(_direction == Direction::VERTICAL)
{
magType = (adjustedDeltaMove.y > 0 ? MagneticType::BOTTOM : MagneticType::TOP);
}
}
// Adjust the delta move amount according to the magnetic type
Vec2 magneticAnchorPoint = getAnchorPointByMagneticType(magType);
Vec2 magneticPosition = -_innerContainer->getPosition();
magneticPosition.x += getContentSize().width * magneticAnchorPoint.x;
magneticPosition.y += getContentSize().height * magneticAnchorPoint.y;
Widget* pTargetItem = getClosestItemToPosition(magneticPosition - adjustedDeltaMove, magneticAnchorPoint);
Vec2 itemPosition = calculateItemPositionWithAnchor(pTargetItem, magneticAnchorPoint);
adjustedDeltaMove = magneticPosition - itemPosition;
}
}
ScrollView::startAttenuatingAutoScroll(adjustedDeltaMove, initialVelocity);
}
