private void ScaleItem(UIScrollPickerItemCtrlBase item)
{
//当处于(0~半个宽度/高度)的范围内时，会被放大
float dist = 0;
float itemWH = 0;
if (direction == EmDirection.Horizontal)
{
dist = item.transform.localPosition.x;
itemWH = itemWidth * SCALE_POS_FACTOR;
}
else
{
dist = item.transform.localPosition.y;
itemWH = itemHeight * SCALE_POS_FACTOR;
}
//
float scale = 1;
if (dist < 0)
{
dist = -dist;
}
if (dist < itemWH)
{
scale = Mathf.Lerp(pickedItemScale, 1, dist / itemWH);
}
item.transform.localScale = new Vector3(scale, scale, scale);
}
public void Reposition()
{
int itemCount = itemArray.Length;
Vector3 startPos = Vector3.zero;
if (direction == EmDirection.Horizontal)
{
startPos.x = -(itemWidth + itemGap) * (curSelectIndex); //左边有几个，起点就得偏移多少
}
else
{
startPos.y = (itemHeight + itemGap) * (curSelectIndex); //左边有几个，起点就得偏移多少
}
for (int i = 0; i < itemCount; i++)
{
UIScrollPickerItemCtrlBase item = itemArray[i];
Vector3 p = Vector3.zero;
if (direction == EmDirection.Horizontal)
{
p.x = i * (itemWidth + itemGap);
}
else
{
p.y = -i * (itemHeight + itemGap);
}
item.transform.localPosition = startPos + p;
ScaleItem(item);
}
}
void Update_Spring()
{
if (isDragging)
{
return;
}
if (!isSpring)
{
return;
}
if (Time.deltaTime > 0.05f)
{
springTimer += 0.05f;
}
else
{
springTimer += Time.deltaTime;
}
float f = springTimer / springDuration;
Vector3 pos = Vector3.Lerp(springStartPos, Vector3.zero, f);
itemArray[curSelectIndex].transform.localPosition = pos;
//其他的项，从selected item向两边对齐
for (int i = 0; i < itemArray.Length; i++)
{
UIScrollPickerItemCtrlBase item = itemArray[i];
Vector3 v = pos;
if (direction == EmDirection.Horizontal)
{
v.x += (itemWidth + itemGap) * (i - curSelectIndex);
}
else
{
v.y -= (itemHeight + itemGap) * (i - curSelectIndex);
}
item.transform.localPosition = v;
ScaleItem(item);
}
if (springTimer >= springDuration)
{
isSpring = false;
}
}
private void Move(Vector3 delta)
{
if (direction == EmDirection.Horizontal)
{
delta.y = 0;
}
else
{
delta.x = 0;
}
//begin 如果第一个或者最后一个会拉过头，则不拉
//第一个
Vector3 pos = itemArray[0].transform.localPosition;
Vector3 newPos = pos + delta;
if (newPos.x > 0)
{
delta.x = -pos.x;
}
if (newPos.y < 0)
{
delta.y = -pos.y;
}
//最后那个
pos = itemArray[itemArray.Length - 1].transform.localPosition;
newPos = pos + delta;
if (newPos.x < 0)
{
delta.x = -pos.x;
}
if (newPos.y > 0)
{
delta.y = -pos.y;
}
//end
for (int i = 0; i < itemArray.Length; i++)
{
UIScrollPickerItemCtrlBase item = itemArray[i];
item.transform.localPosition += new Vector3(delta.x, delta.y, 0);
ScaleItem(item);
//如果item到原点的距离小于一定值，认为被选中了
float threshold = 0;
float dist = 0;
if (direction == EmDirection.Horizontal)
{
threshold = itemWidth * SCALE_POS_FACTOR;
dist = item.transform.localPosition.x;
}
else
{
threshold = itemHeight * SCALE_POS_FACTOR;
dist = item.transform.localPosition.y;
}
//
int s = curSelectIndex;
if (Mathf.Abs(dist) < threshold)
{
s = i;
}
if (s != curSelectIndex)
{
curSelectIndex = s;
if (selectChangeCallback != null)
{
selectChangeCallback(item, curSelectIndex);
}
Debug.Log("seleced item changed: Cur = " + curSelectIndex);
}
}
}
