public void Previous()
{
if (!CheckLength())
{
return;
}
Index--;
if (Index < 0)
{
Index = _length - 1;
}
OnIndexChanged?.Invoke();
}
public void Next()
{
if (!CheckLength())
{
return;
}
Index++;
if (Index > _length - 1)
{
Index = 0;
}
OnIndexChanged?.Invoke();
}
public void GoIndex(int index)
{
Index = index;
for (int i = _blocks.Count - 1; i >= 0; i--)
{
_blocks[i].SetX(i < index ? 0 : (i + 1 - index) * _width);
}
OnIndexChanged?.Invoke(this, new IndexEventArgs(index, Count));
if (Index < Count - 1)
{
return;
}
_addLast();
}
private void LateUpdate()
{
// 滞后删除
if (m_NeedToRemove.Count > 0)
{
DelayDestroy();
}
if (m_Elements == null || m_Elements.Count == 0)
{
return;
}
if (m_Direction == Direction.Vertical)
{
var top = m_Elements.First.Value;
var bottom = m_Elements.Last.Value;
while (IsElementShouldMoveUp(bottom.transform) && top.index > 0)
{
m_Elements.RemoveLast();
m_Elements.AddFirst(bottom);
Vector3 newPos = bottom.transform.localPosition;
if (top.index % m_LineCount == 0)
{
// 不在同一行:top在第一列，bottom的位置则应该是上一行的最后一个位置
newPos.x = top.transform.localPosition.x + (m_LineCount - 1) * GetCellAreaSize().x;
newPos.y = top.transform.localPosition.y + GetCellAreaSize().y;
}
else
{
// 在同一行:bottom位于top的左侧
newPos.x = top.transform.localPosition.x - GetCellAreaSize().x;
newPos.y = top.transform.localPosition.y;
}
bottom.transform.localPosition = newPos;
bottom.index = top.index - 1;
OnIndexChanged.Invoke(bottom.index, bottom.transform);
top = m_Elements.First.Value;
bottom = m_Elements.Last.Value;
}
while (IsElementShouldMoveDown(top.transform) && bottom.index < m_ObjectCount - 1)
{
m_Elements.RemoveFirst();
m_Elements.AddLast(top);
Vector3 newPos = top.transform.localPosition;
if (bottom.index % m_LineCount == (m_LineCount - 1))
{
// 不在同一行:bottom位于最后一列，则top位置应该是下一行的第一列
newPos.x = bottom.transform.localPosition.x - (m_LineCount - 1) * GetCellAreaSize().x;
newPos.y = bottom.transform.localPosition.y - GetCellAreaSize().y;
}
else
{
// 在同一行:top位于bottom右侧
newPos.x = bottom.transform.localPosition.x + GetCellAreaSize().x;
newPos.y = bottom.transform.localPosition.y;
}
top.transform.localPosition = newPos;
top.index = bottom.index + 1;
OnIndexChanged.Invoke(top.index, top.transform);
top = m_Elements.First.Value;
bottom = m_Elements.Last.Value;
}
}
else
{
var left = m_Elements.First.Value;
var right = m_Elements.Last.Value;
while (IsElementShouldMoveLeft(right.transform) && left.index > 0)
{
m_Elements.RemoveLast();
m_Elements.AddFirst(right);
Vector3 newPos = right.transform.localPosition;
if (left.index % m_LineCount == 0)
{
// 不在同一列:left位于第一行，则right位置应该是上一列的最后一行
newPos.x = left.transform.localPosition.x - GetCellAreaSize().x;
newPos.y = left.transform.localPosition.y - (m_LineCount - 1) * GetCellAreaSize().y;
}
else
{
// 在同一列:right位于left的上方
newPos.x = left.transform.localPosition.x;
newPos.y = left.transform.localPosition.y + GetCellAreaSize().y;
}
right.transform.localPosition = newPos;
right.index = left.index - 1;
OnIndexChanged.Invoke(right.index, right.transform);
left = m_Elements.First.Value;
right = m_Elements.Last.Value;
}
while (IsElementShouldMoveRight(left.transform) && right.index < m_ObjectCount - 1)
{
m_Elements.RemoveFirst();
m_Elements.AddLast(left);
Vector3 newPos = left.transform.localPosition;
if (right.index % m_LineCount == (m_LineCount - 1))
{
// 不在同一列:right位于最后一行，则left应该位于下一列的第一行
newPos.x = right.transform.localPosition.x + GetCellAreaSize().x;
newPos.y = right.transform.localPosition.y + (m_LineCount - 1) * GetCellAreaSize().y;
}
else
{
// 在同一列：left位于right的下方
newPos.x = right.transform.localPosition.x;
newPos.y = right.transform.localPosition.y - GetCellAreaSize().y;
}
left.transform.localPosition = newPos;
left.index = right.index + 1;
OnIndexChanged.Invoke(left.index, left.transform);
left = m_Elements.First.Value;
right = m_Elements.Last.Value;
}
}
}
private void CreateElements()
{
int elementCount = Mathf.Min(m_ObjectCount, CalculateElementsCount());
m_Elements = new LinkedList <Element>();
// 每行/每列最大元素的数量
int eleCountPerLine = Mathf.CeilToInt((float)m_ObjectCount / m_LineCount);
if (m_Direction == Direction.Vertical)
{
float contentHeight = GetCellAreaSize().y *eleCountPerLine + m_Padding.vertical;
float contentWidth = GetCellAreaSize().x *m_LineCount + m_Padding.horizontal;
Content.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, contentWidth);
Content.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, contentHeight);
}
else
{
float contentHeight = GetCellAreaSize().y *m_LineCount + m_Padding.vertical;
float contentWidth = GetCellAreaSize().x *eleCountPerLine + m_Padding.horizontal;
Content.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, contentWidth);
Content.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, contentHeight);
}
int childCount = rectChildren.Count;
for (int i = 0; i < elementCount; i++)
{
RectTransform rt = null;
if (i < childCount)
{
rt = this.rectTransform.GetChild(i) as RectTransform;
}
else if (m_ElementPrefab != null)
{
GameObject g = Instantiate(m_ElementPrefab, Content);
rt = g.transform as RectTransform;
}
if (rt == null)
{
return;
}
// 沿着指定方向的索引数（水平-列索引、垂直-行索引）
int r = Mathf.FloorToInt((float)i / m_LineCount);
// 行内索引(水平-行索引、垂直-列索引)
int c = i % m_LineCount;
if (m_Direction == Direction.Horizontal)
{
Vector2 offset = new Vector2(GetStartOffset(0, GetCellAreaSize().x *eleCountPerLine), GetStartOffset(1, m_CellSize.y));
SetChildAlongAxis(rt, 0, offset.x + GetCellAreaSize().x *r);
SetChildAlongAxis(rt, 1, offset.y + GetCellAreaSize().y *c);
}
else
{
Vector2 offset = new Vector2(GetStartOffset(0, m_CellSize.x), GetStartOffset(1, GetCellAreaSize().y *eleCountPerLine));
SetChildAlongAxis(rt, 0, offset.x + GetCellAreaSize().x *c);
SetChildAlongAxis(rt, 1, offset.y + GetCellAreaSize().y *r);
}
m_Elements.AddLast(new Element()
{
index = i,
transform = rt
});
}
// Fix : 修复子物体数量大于所需数量时，删除多余部分
// 滞后删除，在 Rebuild 阶段不允许删除对象
for (int i = elementCount; i < childCount; i++)
{
RectTransform child = rectTransform.GetChild(i) as RectTransform;
if (child == null)
{
continue;
}
m_NeedToRemove.Add(child.gameObject);
}
var ele = m_Elements.First;
while (ele != null)
{
OnIndexChanged.Invoke(ele.Value.index, ele.Value.transform);
ele = ele.Next;
}
}