//设置中间
public void SetCenterItem(EnhanceScrollViewItem selectItem)
{
if (!mChangeItem)
{
return;
}
if (mCurCenterItem == selectItem)
{
return;
}
mChangeItem = false;
mPreCenterItem = mCurCenterItem;
mCurCenterItem = selectItem;
bool isRight = false;
if (selectItem.transform.localPosition.x > m_CenterXValue)
{
isRight = true;
}
SortEnhanceItem();
int moveIndex = Mathf.Abs(mPreCenterItem.RealIndex - selectItem.RealIndex);
float intervalValue = 0.0f;
if (isRight)
{
intervalValue = -moveIndex * mIntervalFactor;
}
else
{
intervalValue = moveIndex * mIntervalFactor;
}
PrepareTween(m_CurHorizontalSliderValue, m_CurHorizontalSliderValue + intervalValue, true);
}
//更新界面,sliderValue为整个界面的滑动条值，思路是通过整个界面的滑动条值，计算子界面的滑动条值
//sliderValue 为整个界面的sliderValue,大小无限制
private void UpdateScrollView(float sliderValue)
{
for (int i = 0; i < mItemList.Count; i++)
{
EnhanceScrollViewItem item = mItemList[i];
float childSliderVaue = sliderValue + item.LocalSliderValue;
item.SliderValue = childSliderVaue;
float xPosValue = GetXPosValue(childSliderVaue);
float scaleValue = GetScaleValue(childSliderVaue);
float depthValue = GetDepthValue(childSliderVaue);
item.UpdateInScrollView(xPosValue, YFixedPositionValue, scaleValue, depthValue, mDepthFactor, mItemList.Count);
}
}
private void Start()
{
//规则 极左-极右（0-1）
mChangeItem = true;
int count = mItemList.Count;
m_CenterIndex = count / 2;
if (count % 2 == 0)
{
m_CenterIndex = count / 2 - 1;
}
mIntervalFactor = (Mathf.RoundToInt((1f / count) * 10000f)) * 0.0001f;
int index = 0;
for (int i = 0; i < count; i++)
{
mItemList[i].StartIndex = i;
mItemList[i].LocalSliderValue = mIntervalFactor * (m_CenterIndex + index);
mItemList[i].SetSelectState(false);
mItemList[i].Init(this);
index++;
}
//越界的情况下设置中心的item
if (StartCenterIndex < 0 || StartCenterIndex > count)
{
StartCenterIndex = m_CenterIndex;
}
//排序
mSortItemList = new List <EnhanceScrollViewItem>(mItemList.ToArray());
mTotalHorizontalWidth = CellWidth * count;
mCurCenterItem = mSortItemList[StartCenterIndex];
m_CurHorizontalSliderValue = 0.5f - mCurCenterItem.LocalSliderValue;
m_CenterXValue = PositionCurve.Evaluate(0.5f) * mTotalHorizontalWidth;
PrepareTween(0, m_CurHorizontalSliderValue, false);
}
//拖拽结束
public void OnDragEnd()
{
float minDis = Mathf.Infinity;
int minIndex = 0;
for (int i = 0; i < mItemList.Count; i++)
{
float distance = Mathf.Abs(mItemList[i].transform.localPosition.x - m_CenterXValue);
if (distance < minDis)
{
minDis = distance;
minIndex = i;
}
}
float target = 0;
EnhanceScrollViewItem item = mItemList[minIndex];
float remainder = item.SliderValue % mIntervalFactor;
bool isEven = mItemList.Count % 2 == 0;
float start = m_CurHorizontalSliderValue;
//在中心的右边
if (item.transform.localPosition.x > m_CenterXValue)
{
if (m_CurHorizontalSliderValue > 0)
{
if (!isEven)
{
start = m_CurHorizontalSliderValue + mIntervalFactor / 2;
}
target = start + (mIntervalFactor - m_CurHorizontalSliderValue % mIntervalFactor) - mIntervalFactor;
}
else
{
if (!isEven)
{
start = m_CurHorizontalSliderValue + mIntervalFactor / 2;
}
target = start - (mIntervalFactor + m_CurHorizontalSliderValue % mIntervalFactor);
}
}
else//左边
{
if (m_CurHorizontalSliderValue > 0)
{
if (!isEven)
{
start = m_CurHorizontalSliderValue - mIntervalFactor / 2;
}
target = start - m_CurHorizontalSliderValue % mIntervalFactor + mIntervalFactor;
}
else
{
if (!isEven)
{
start = m_CurHorizontalSliderValue - mIntervalFactor / 2;
}
target = start - m_CurHorizontalSliderValue % mIntervalFactor;
}
}
mPreCenterItem = mCurCenterItem;
mCurCenterItem = item;
PrepareTween(m_CurHorizontalSliderValue, target, true);
mChangeItem = false;
}