private void InitTemplate()
{
for (int i = 0; i < m_CacheCount; i++)
{
ItemModelView itemModelView = InstantiateItem(i);
itemModelView.SetContext(i, Collection.GetBaseItem(i));
}
}
protected virtual ItemModelView InstantiateItem(int index)
{
GameObject itemObject = Instantiate(Template, transform);
Transform itemTransform = itemObject.transform;
itemTransform.localScale = Vector3.one;
itemTransform.localPosition = Vector2.one * 5000;
itemTransform.transform.SetSiblingIndex(index);
ItemModelView modelView = itemObject.GetOrAddComponent <ItemModelView>();
modelView.TemplateName = Template.name;
return(modelView);
}
protected override void OnItemInsert(int index, ItemContext itemContext)
{
if (Template == null)
{
Log.Error("Template is invalid");
return;
}
ItemModelView itemModelView = InstantiateItem(index);
m_ItemModelViews.Insert(index, itemModelView);
UpdateContext(index);
}
private ItemModelView InstantiateItem(int index)
{
GameObject itemObject = Instantiate(Template, transform);
RectTransform rectTransform = itemObject.GetComponent <RectTransform>();
rectTransform.localScale = Vector3.one;
rectTransform.anchorMax = rectTransform.anchorMin = Vector2.one / 2f;
rectTransform.sizeDelta = m_ItemSize;
SetItemPosition(rectTransform, index);
rectTransform.transform.SetSiblingIndex(index);
ItemModelView modelView = itemObject.GetOrAddComponent <ItemModelView>();
modelView.TemplateName = Template.name;
m_ItemModelViews.AddLast(modelView);
return(modelView);
}
/// <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);
}
