public void OnEndDrag(PointerEventData eventData)
{
// find closed item to be centered
int focusIndex = 0;
float value = (curScrollValue - (int)curScrollValue);
float min = float.MaxValue;
float tmp = 0.5f * (curScrollValue < 0 ? -1 : 1);
for (int i = 0; i < itemList.Count; i++)
{
float dis = Mathf.Abs(Mathf.Abs(value) - Mathf.Abs((tmp - itemList[i].CenterOffSet)));
if (dis < min)
{
focusIndex = i;
min = dis;
}
}
originScrollValue = curScrollValue;
float target = ((int)curScrollValue + (tmp - itemList[focusIndex].CenterOffSet));
preCenterItem = curCenterItem;
curCenterItem = itemList[focusIndex];
canChangeItem = false;
LerpTweenToTarget(originScrollValue, target, false);
}
public void FocusOnTargetItem(UIEnhanceItem selectItem)
{
if (!canChangeItem)
{
return;
}
if (curCenterItem == selectItem)
{
return;
}
preCenterItem = curCenterItem;
curCenterItem = selectItem;
// calculate the direction of moving
float centerXValue = positionCurve.Evaluate(0.5f) * TotalWidth;
bool isRight = selectItem.transform.localPosition.x > centerXValue;
// calculate the offset * dFactor
int moveIndexCount = GetMoveCurveFactorCount(preCenterItem, selectItem);
float deltaValue = (isRight? -1:1) * moveOffsetPerItem * moveIndexCount;
canChangeItem = false;
LerpTweenToTarget(curScrollValue, curScrollValue + deltaValue, false);
}
protected int GetMoveCurveFactorCount(UIEnhanceItem preCenterItem, UIEnhanceItem newCenterItem)
{
SortEnhanceItem();
int factorCount = Mathf.Abs(newCenterItem.RealIndex) - Mathf.Abs(preCenterItem.RealIndex);
return(Mathf.Abs(factorCount));
}
// Update EnhanceItem state with curve fTime value
protected virtual void UpdateEnhanceScrollView(float value)
{
for (int i = 0; i < itemList.Count; i++)
{
UIEnhanceItem item = itemList[i];
float posX = GetPosXValue(value, item.CenterOffSet);
float scaleValue = GetScaleValue(value, item.CenterOffSet);
int depth = (int)(depthCurve.Evaluate(value + item.CenterOffSet) * itemList.Count);
item.Refresh(posX, scaleValue, depth);
}
}
protected virtual void Awake()
{
ItemCount = itemList.Count;
moveOffsetPerItem = (Mathf.RoundToInt((1f / ItemCount) * 10000f)) * 0.0001f;
if (ItemCount % 2 == 0)
{
mCenterIndex = ItemCount / 2 - 1;
}
else
{
mCenterIndex = ItemCount / 2;
}
int index = 0;
for (int i = ItemCount - 1; i >= 0; i--)
{
UIEnhanceItem item = itemList[i];
item.CurveOffSetIndex = i;
item.CenterOffSet = moveOffsetPerItem * (mCenterIndex - index);
item.SetSelectState(false);
index++;
}
// set the center item with startCenterIndex
if (startCenterIndex < 0 || startCenterIndex >= ItemCount)
{
startCenterIndex = mCenterIndex;
}
TotalWidth = ItemSize.x * ItemCount;
// sorted items
sortedItemList = new List <UIEnhanceItem>(itemList);
curCenterItem = itemList[startCenterIndex];
curScrollValue = 0.5f - curCenterItem.CenterOffSet;
LerpTweenToTarget(0f, curScrollValue, true);
canChangeItem = true;
}
// sort item with X so we can know how much distance we need to move the timeLine(curve time line)
public static int SortPosition(UIEnhanceItem a, UIEnhanceItem b)
{
return(a.transform.localPosition.x.CompareTo(b.transform.localPosition.x));
}