88 lines
3.3 KiB
Plaintext
88 lines
3.3 KiB
Plaintext
---
|
|
description: Typed event bus — emitting and listening to node and grid events
|
|
globs: packages/core/src/events/**,packages/viewer/**,apps/editor/**
|
|
alwaysApply: false
|
|
---
|
|
|
|
# Events
|
|
|
|
The event bus (`emitter`) is a global `mitt` instance typed with `EditorEvents`. It decouples renderers (which emit) from selection managers and tools (which listen).
|
|
|
|
**Source**: @packages/core/src/events/bus.ts
|
|
|
|
## Event Key Format
|
|
|
|
```
|
|
<nodeType>:<suffix>
|
|
```
|
|
|
|
Example keys: `wall:click`, `item:enter`, `door:double-click`, `grid:pointerdown`
|
|
|
|
### Node Types
|
|
`wall` `item` `site` `building` `level` `zone` `slab` `ceiling` `roof` `window` `door`
|
|
|
|
### Suffixes
|
|
```ts
|
|
'click' | 'move' | 'enter' | 'leave' | 'pointerdown' | 'pointerup' | 'context-menu' | 'double-click'
|
|
```
|
|
|
|
The `grid:*` events fire when the user interacts with empty space (no node hit). They are **not** emitted by a mesh — `useGridEvents(gridY)` (@apps/editor/hooks/use-grid-events.ts) manually raycasts against a ground plane and calls `emitter.emit('grid:click', …)`. Mount it in any tool or editor component that needs empty-space interactions.
|
|
|
|
## NodeEvent Shape
|
|
|
|
```ts
|
|
interface NodeEvent<T extends AnyNode = AnyNode> {
|
|
node: T // typed node that triggered the event
|
|
position: [number, number, number] // world-space hit position
|
|
localPosition: [number, number, number] // object-local hit position
|
|
normal?: [number, number, number] // face normal, if available
|
|
stopPropagation: () => void
|
|
nativeEvent: ThreeEvent<PointerEvent>
|
|
}
|
|
```
|
|
|
|
Grid events only carry `position` and `nativeEvent` (no `node`).
|
|
|
|
## Emitting
|
|
|
|
Renderers emit via `useNodeEvents` — never call `emitter.emit` directly in a renderer:
|
|
|
|
```tsx
|
|
// packages/viewer/src/hooks/use-node-events.ts
|
|
const events = useNodeEvents(node, 'wall')
|
|
return <mesh ref={ref} {...events} />
|
|
```
|
|
|
|
`useNodeEvents` converts R3F `ThreeEvent` into a `NodeEvent` and emits `wall:click`, `wall:enter`, etc. It suppresses events while the camera is dragging.
|
|
|
|
## Listening
|
|
|
|
Listen in a `useEffect`. Always clean up with `emitter.off` using the **same function reference**:
|
|
|
|
```ts
|
|
// Single event
|
|
useEffect(() => {
|
|
const handler = (e: WallEvent) => { /* … */ }
|
|
emitter.on('wall:click', handler)
|
|
return () => emitter.off('wall:click', handler)
|
|
}, [])
|
|
|
|
// Multiple node types, same handler
|
|
useEffect(() => {
|
|
const types = ['wall', 'slab', 'door'] as const
|
|
const handler = (e: NodeEvent) => { /* … */ }
|
|
types.forEach(t => emitter.on(`${t}:click`, handler as any))
|
|
return () => types.forEach(t => emitter.off(`${t}:click`, handler as any))
|
|
}, [])
|
|
```
|
|
|
|
See @apps/editor/components/editor/selection-manager.tsx for a full multi-type listener example.
|
|
|
|
## Rules
|
|
|
|
- **Renderers only emit, never listen.** Listening belongs in selection managers, tools, or systems.
|
|
- **Always clean up.** Forgetting `emitter.off` causes duplicate handlers and memory leaks.
|
|
- **Use the same function reference** for `on` and `off`. Anonymous functions inside `useEffect` are fine as long as the ref is captured in the same scope.
|
|
- **Don't use emitter for state.** It's for one-shot interaction events. Persistent state goes in `useScene`, `useViewer`, or `useEditor`.
|
|
- **`stopPropagation`** prevents the event from being handled by overlapping listeners (e.g. a door on a wall). Call it when a handler should be the final consumer.
|