protected bool RemoveAt(int index)
{
if (0 <= index && index < children.Count)
{
UIVisual child = children[index];
children.RemoveAt(index);
child.Parent = null;
OnChildRemoved(child);
return(true);
}
else
{
return(false);
}
}
protected void Add(UIVisual item)
{
if (item == null)
{
return;
}
int zOrder = item.ZOrder;
for (int i = children.Count - 1; i >= 0; i--)
{
if (zOrder >= children[i].ZOrder)
{
Insert(i + 1, item);
return;
}
}
Insert(0, item);
}
private void Insert(int index, UIVisual item)
{
index = MathExtension.Clamp(index, 0, children.Count);
if (item.Parent != null)
{
item.Parent.Remove(item);
}
Debug.Assert(item.Parent == null);
item.Parent = this;
if (index < children.Count)
{
children.Insert(index, item);
}
else
{
children.Add(item);
}
OnChildAdded(item);
}
protected bool Remove(UIVisual item)
{
return(RemoveAt(children.IndexOf(item)));
}
internal void BringChildToFront(UIVisual child)
{
}
internal void SendChildToBack(UIVisual child)
{
}
internal void OnChildZOrderChanged(UIVisual child, int old)
{
}
protected virtual void OnChildrenRemoved(UIVisual item)
{
}
protected virtual void OnChildAdded(UIVisual item)
{
}
public void RemoveChild(UIVisual item)
{
Remove(item);
}
public void AddChild(UIVisual item)
{
Add(item);
}