public override void SetLayoutVertical()
{
HandleSelfFittingAndChildrenSizeAlongAxis(1);
if (m_ProcessLayoutVertical)
{
return;
}
//对于高度限制的Item的设计，不要立刻派发布局完成，可能导致改变了宽度，需要重新计算
//一般不要设置这个属性，会导致两遍计算
if (m_NeedRecalculate)
{
m_ProcessLayoutVertical = true;
LayoutRebuilderUtility.ForceRebuildLayoutImmediate(rectTransform);
}
if (m_LayoutGroupComplete != null)
{
m_ProcessLayoutVertical = false;
m_LayoutGroupComplete.Invoke();
}
}
protected bool SetChildrenAlongAxis(bool isVertical)
{
for (int axis = 0; axis < 2; ++axis)
{
float size = rectTransform.rect.size[axis];
float startOffset = -m_TopStartPosition;
bool alongOtherAxis = (isVertical ^ (axis == 1));
if (alongOtherAxis)
{
float innerSize = size;
startOffset = 0;
for (int i = 0; i < itemViewChildren.Count; i++)
{
var child = itemViewChildren[i].ItemRectTransform;
var itemSize = LayoutUtility.GetPreferredSize(child, axis);
SetChildItemAlongAxis(child, axis, startOffset, innerSize);
if (!Mathf.Approximately(itemSize, innerSize))
{
LayoutRebuilderUtility.ForceRebuildLayoutImmediate(child);
return(true);
}
}
}
else
{
for (int i = 0; i < itemViewChildren.Count; i++)
{
var child = itemViewChildren[i].ItemRectTransform;
var itemSize = LayoutUtility.GetPreferredSize(child, axis);
SetChildItemAlongAxis(child, axis, startOffset, itemSize);
startOffset += itemSize + m_Divider;
}
}
}
return(false);
}
