Draw order

The draw order of elements in the visual tree follows a depth-first search. Child visual elements appear on top of parent elements. UI Toolkit draws child elements in the order of the sibling list. The draw order is the following:

1. 顶级视觉元素。
2. 该视觉元素的第一个子元素。
3. 后代元素的子元素。

The diagram below shows the draw order of a visual tree:

To change the draw order of visual elements in C#, use the following functions:

• BringToFront()
• SendToBack()

To change the draw order of sibling visual elements, use the following functions:

• PlaceBehind()
• PlaceInFront()