/// 创建Element
protected UIListViewItem CreateElement(int index, ref stRect rect)
{
UIListViewItem elementScript = null;
//找
if (m_unUsedElementScripts.Count > 0)
{
elementScript = m_unUsedElementScripts[0];
m_unUsedElementScripts.RemoveAt(0);
}
else if (m_elementTemplate != null)
{
//克隆
GameObject elementObject = Instantiate(m_elementTemplate);
elementObject.transform.SetParent(m_content.transform);
elementObject.transform.localScale = Vector3.one;
//初始化
InitializeComponent(elementObject);
//
elementScript = elementObject.GetComponent <UIListViewItem>();
}
if (elementScript != null)
{
elementScript.Enable(this, index, m_elementName, ref rect, IsSelectedIndex(index));
m_elementScripts.Add(elementScript);
//JW.Common.Log.LogD("Dispatch Element On Create Event, index = " + index);
if (OnEnableItemHandler != null)
{
OnEnableItemHandler(elementScript);
}
}
return(elementScript);
}
/// 设置在Content上的位置
public void SetRect(ref stRect rect)
{
m_rect = rect;
RectTransform rectTransform = gameObject.transform as RectTransform;
rectTransform.sizeDelta = new Vector2(m_rect.m_width, m_rect.m_height);
rectTransform.anchoredPosition = new Vector2(rect.m_left, rect.m_top);
rectTransform.anchoredPosition3D = new Vector3(rect.m_left, rect.m_top, 0);
}
/// 某项元素是否在滚动区域内(是否可见)
public bool IsElementInScrollArea(int index)
{
if (index < 0 || index >= m_elementAmount)
{
return(false);
}
stRect rect = (m_useOptimized) ? m_elementsRect[index] : m_elementScripts[index].m_rect;
return(IsRectInScrollArea(ref rect));
}
/// 处理元素
protected virtual void ProcessElements()
{
m_contentSize = Vector2.zero;
Vector2 offset = Vector2.zero;
if (m_listType == UIListViewType.Vertical || m_listType == UIListViewType.VerticalGrid)
{
offset.y += m_elementLayoutOffset;
}
else
{
offset.x += m_elementLayoutOffset;
}
for (int i = 0; i < m_elementAmount; i++)
{
//Element布局
stRect rect = LayoutElement(i, ref m_contentSize, ref offset);
//记录Element Rect
if (m_useOptimized)
{
if (i < m_elementsRect.Count)
{
m_elementsRect[i] = rect;
}
else
{
m_elementsRect.Add(rect);
}
}
if (!m_useOptimized || IsRectInScrollArea(ref rect))
{
CreateElement(i, ref rect);
}
}
//设置extraContent if exist
if (m_extraContent != null)
{
if (m_elementAmount > 0)
{
ProcessExtraContent(ref m_contentSize, offset);
}
else
{
m_extraContent.SetActive(false);
}
}
//设置内容区域大小
ResizeContent(ref m_contentSize, false);
}
/// 将某项元素移动到滚动区域内(使其可见)
public void MoveElementInScrollArea(int index, bool moveImmediately)
{
if (index < 0 || index >= m_elementAmount)
{
return;
}
Vector2 fixedOffset = Vector2.zero;
Vector2 position = Vector2.zero;
stRect rect = (m_useOptimized) ? m_elementsRect[index] : m_elementScripts[index].m_rect;
position.x = m_contentRectTransform.anchoredPosition.x + rect.m_left;
position.y = m_contentRectTransform.anchoredPosition.y + rect.m_top;
if (position.x < 0)
{
fixedOffset.x = -position.x;
}
else if (position.x + rect.m_width > m_scrollAreaSize.x)
{
fixedOffset.x = m_scrollAreaSize.x - (position.x + rect.m_width);
}
if (position.y > 0)
{
fixedOffset.y = -position.y;
}
else if (position.y - rect.m_height < -m_scrollAreaSize.y)
{
fixedOffset.y = -m_scrollAreaSize.y - (position.y - rect.m_height);
}
if (moveImmediately)
{
m_contentRectTransform.anchoredPosition += fixedOffset;
}
else
{
Vector2 contentTargetAnchoredPosition = m_contentRectTransform.anchoredPosition + fixedOffset;
//动画
DOTween.To(() => { return(m_contentRectTransform.anchoredPosition); },
pos => { m_contentRectTransform.anchoredPosition = pos; },
contentTargetAnchoredPosition,
m_fSpeed);
}
}
/// rect是否位于滚动可视区域
protected bool IsRectInScrollArea(ref stRect rect)
{
Vector2 position = Vector2.zero;
position.x = m_contentRectTransform.anchoredPosition.x + rect.m_left;
position.y = m_contentRectTransform.anchoredPosition.y + rect.m_top;
if (position.x + rect.m_width < 0 ||
position.x > m_scrollAreaSize.x ||
position.y - rect.m_height > 0 ||
position.y < -m_scrollAreaSize.y
)
{
return(false);
}
else
{
return(true);
}
}
/// 处理元素滚动(优化模式)
protected void UpdateElementsScroll()
{
//回收显示区域以外的Element
for (int i = 0; i < m_elementScripts.Count;)
{
if (!IsRectInScrollArea(ref m_elementScripts[i].m_rect))
{
RecycleElement(m_elementScripts[i], true);
continue;
}
i++;
}
//展示显示区域以内的Element
for (int i = 0; i < m_elementAmount; i++)
{
stRect rect = m_elementsRect[i];
if (IsRectInScrollArea(ref rect))
{
bool exist = false;
for (int j = 0; j < m_elementScripts.Count; j++)
{
if (m_elementScripts[j].m_index == i)
{
exist = true;
break;
}
}
if (!exist)
{
CreateElement(i, ref rect);
}
}
}
}
/// Enable元素
public void Enable(UIListView belongedList, int index, string name, ref stRect rect, bool selected)
{
m_belongedListScript = belongedList;
m_index = index;
//
gameObject.name = name + "_" + index.ToString();
if (m_useSetActiveForDisplay)
{
gameObject.ExtSetActive(true);
}
else
{
m_canvasGroup.alpha = 1f;
m_canvasGroup.blocksRaycasts = true;
}
//递归设置从属List
SetComponentBelongedList(gameObject);
//设置位置属性
SetRect(ref rect);
//设置选中/非选中外观
ChangeDisplay(selected);
}
/// 计算元素布局
protected stRect LayoutElement(int index, ref Vector2 contentSize, ref Vector2 offset)
{
stRect rect = new stRect();
rect.m_width = (int)((m_elementsSize == null || m_listType == UIListViewType.Vertical || m_listType == UIListViewType.VerticalGrid || m_listType == UIListViewType.HorizontalGrid) ? m_elementDefaultSize.x : m_elementsSize[index].x);
rect.m_height = (int)((m_elementsSize == null || m_listType == UIListViewType.Horizontal || m_listType == UIListViewType.VerticalGrid || m_listType == UIListViewType.HorizontalGrid) ? m_elementDefaultSize.y : m_elementsSize[index].y);
rect.m_left = (int)offset.x;
rect.m_top = (int)offset.y;
rect.m_right = rect.m_left + rect.m_width;
rect.m_bottom = rect.m_top - rect.m_height;
rect.m_center = new Vector2(rect.m_left + rect.m_width * 0.5f, rect.m_top - rect.m_height * 0.5f);
if (rect.m_right > contentSize.x)
{
contentSize.x = rect.m_right;
}
if (-rect.m_bottom > contentSize.y)
{
contentSize.y = -rect.m_bottom;
}
switch (m_listType)
{
case UIListViewType.Vertical:
{
offset.y -= (rect.m_height + m_elementSpacing.y);
}
break;
case UIListViewType.Horizontal:
{
offset.x += (rect.m_width + m_elementSpacing.x);
}
break;
case UIListViewType.VerticalGrid:
{
offset.x += (rect.m_width + m_elementSpacing.x);
if (offset.x + rect.m_width > m_scrollAreaSize.x)
{
offset.x = 0;
offset.y -= (rect.m_height + m_elementSpacing.y);
}
}
break;
case UIListViewType.HorizontalGrid:
{
offset.y -= (rect.m_height + m_elementSpacing.y);
if (-offset.y + rect.m_height > m_scrollAreaSize.y)
{
offset.y = 0;
offset.x += (rect.m_width + m_elementSpacing.x);
}
}
break;
}
return(rect);
}