/**
* Get the offset to move to in order to snap to the page
*/
public float SnapOffsetForPage(int pageIndex, SnapEdge edge)
{
var offset = PdfFile.GetPageOffset(pageIndex, Zoom);
float length = IsSwipeVertical ? Height : Width;
var pageLength = PdfFile.GetPageLength(pageIndex, Zoom);
switch (edge)
{
case SnapEdge.Center:
offset = offset - length / 2f + pageLength / 2f;
break;
case SnapEdge.End:
offset = offset - length + pageLength;
break;
case SnapEdge.Start:
break;
case SnapEdge.None:
break;
default:
throw new ArgumentOutOfRangeException(nameof(edge), edge, null);
}
return(offset);
}
private IEnumerator SnapTo(SnapEdge edge)
{
yield return(new WaitUntil(() => scrolling == false));
var closestCard = GetClosestCard(edge);
if (!scrolling)
{
LerpTo(closestCard, edge);
}
}
private void LerpTo(RectTransform card, SnapEdge edge)
{
RectTransform target = (edge == SnapEdge.Top) ? top : bottom;
var yDistance = card.position.y - target.position.y;
var lerpDistance = new Vector3(0f, -yDistance, 0f);
if (yDistance < 0)
{
lerpDistance -= new Vector3(0f, distanceBetweenTwoRows, 0f);
}
lerpDistance += new Vector3(0f, distanceBetweenTwoRows / 2, 0f);
var rect = cardLibraryController.GetComponent <RectTransform>();
StartCoroutine(MoveRectTransform(rect, lerpDistance, 1f));
}
private RectTransform GetClosestCard(SnapEdge edge)
{
RectTransform target = (edge == SnapEdge.Top) ? top : bottom;
RectTransform closestCard = null;
float closestDistanceSquare = Mathf.Infinity;
foreach (RectTransform card in cardRects)
{
Vector3 directionToTarget = target.position - card.position;
float directionSquared = directionToTarget.sqrMagnitude;
if (directionSquared < closestDistanceSquare)
{
closestCard = card;
closestDistanceSquare = directionSquared;
}
}
return(closestCard);
}
public void Snap(SnapEdge edge)
{
StopAllCoroutines();
StartCoroutine(SnapTo(edge));
}
