internal DisplayObject AddChildAt(DisplayObject child, int index)
{
int count = this._children.Count;
index = Mathf.Clamp(index, 0, count);
if (child.parent == this)
{
this.SetChildIndex(child, index);
}
else
{
child.RemoveFromParent();
child.SetParent(this);
child.siblingIndex = index;
this._children.Add(child);
this._children.Sort(CompareSiblingIndex);
if (this.stage != null) //可能父对象还没有添加到舞台哦
{
child.HandleAddToStage();
}
}
return(child);
}
internal DisplayObject RemoveChildAt(int index, bool dispose = false)
{
if (index < 0 || index >= this._children.Count)
{
return(null);
}
DisplayObject child = this._children[index];
if (this.stage != null)
{
child.HandleRemoveFromStage();
}
this._children.Remove(child);
if (!dispose)
{
child.SetParent(null);
}
else
{
child.Dispose();
}
return(child);
}