Customizing gadget appearance
Factor handbook > UI framework > Implementing new gadgets

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The UI carries out the following steps when drawing a gadget:
The draw-interior generic word is called on the value of the interior slot.
The draw-gadget* generic word is called on the gadget.
The gadget's visible children are drawn, determined by calling visible-children on the gadget.
The draw-boundary generic word is called on the value of the boundary slot.

Now, each one of these steps will be covered in detail.
UI pen protocol
Implementing custom drawing logic