In your UI, you structure elements into a visual tree.
| Topic | 描述 |
|---|---|
| Introduction to visual elements and visual tree | Understand visual elements in the visual tree and how to use it. |
| Panels | Understand panels in the visual tree. |
| Draw order | Understand the elements ordering in the visual tree. |
| Coordinate and position systems | Understand relative and absolute coordinates and transformation between coordinate systems. |