Module registry 

Host-defined tools and availability of built-in tools.

Structs

DrawingToolRegistry

Per-manager catalogue. Register stable host-owned string ids before loading drawings. Unknown custom ids stay in storage but are not rendered or hit until registered. Clone the catalogue into a host picker to share implementations and availability.

RegisteredDrawingTool

A registered tool’s host-facing name, anchor count and implementation.

ToolAvailability

Whether a built-in tool appears in a picker and can create new drawings. Existing drawings remain visible and editable, so hiding a tool never makes a saved annotation disappear.

Traits

DrawingRenderer

Rendering, picking and settings for a host-defined drawing tool. Anchors are projected by the manager into drawing.points; tool-specific data lives in drawing.custom_settings. Callbacks must tolerate incomplete drawings while the pointer previews their construction.