private void InitTemplate()
{
for (int i = 0; i < m_CacheCount; i++)
{
ItemModelView itemModelView = InstantiateItem(i);
itemModelView.SetContext(i, Collection.GetBaseItem(i));
}
}
/// <summary>
/// 更新Item的位置
/// </summary>
/// <param name="itemModelView">ItemModelView</param>
/// <returns>当水平滑动时,左边界返回1,右边界返回-1,未更新返回0,当垂直滑动时,上边界返回-1,下边界返回1,未更新返回0</returns>
private int UpdatePosition(ItemModelView itemModelView)
{
Transform itemTrans = itemModelView.transform;
float viewPos = m_Content.InverseTransformPoint(m_Viewport.position)[(int)m_Axis];
float itemPos = m_Content.InverseTransformPoint(itemTrans.position)[(int)m_Axis];
float distance = itemPos - viewPos;
if (distance > m_Extents || distance < -m_Extents)
{
int sign = distance > m_Extents ? -1 : 1;
float moveExtents = m_Extents - m_ItemSize[(int)m_Axis] * 0.5f;
int index = itemModelView.Index;
ItemContext itemContext = null;
if (m_Axis == RectTransform.Axis.Horizontal)
{
index += sign * m_CacheCount;
}
else
{
index -= sign * m_CacheCount;
}
itemContext = Collection.GetBaseItem(index);
if (itemContext == null)
{
return(0);
}
float value = moveExtents * 2 + m_Spacing;
itemTrans.localPosition += sign * GetAxisVector3(value);
itemModelView.ClearAllCache();
itemModelView.SetContext(index, itemContext);
//Log.Debug("{0} : {1}", m_Axis, sign);
return(sign);
}
return(0);
}