Emit an event when camera options change

This allows you to listen to changes to `autoWheelBehavior` and store it
in e.g. local storage so you can initialize it to the same value the
next time tldraw is laoded.

packages/editor/api-report.md

@@ -2982,6 +2982,8 @@ export type TLEventInfo = TLCancelEventInfo | TLClickEventInfo | TLCompleteEvent
 
 // @public (undocumented)
 export interface TLEventMap {
+    // (undocumented)
+    'camera-options-changed': [TLCameraOptions];
     // (undocumented)
     'max-shapes': [{
         count: number;

packages/editor/src/lib/editor/Editor.ts

@@ -2440,6 +2440,7 @@ export class Editor extends EventEmitter<TLEventMap> {
 		if (next.zoomSteps?.length < 1) next.zoomSteps = [1]
 		this._cameraOptions.set(next)
 		this.setCamera(this.getCamera())
+		this.emit('camera-options-changed', next)
 		return this
 	}
 

packages/editor/src/lib/editor/types/emit-types.ts

@@ -1,6 +1,7 @@
 import { HistoryEntry } from '@tldraw/store'
 import { TLPageId, TLRecord, TLShapeId } from '@tldraw/tlschema'
 import { TLEventInfo } from './event-types'
+import { TLCameraOptions } from './misc-types'
 
 /** @public */
 export interface TLEventMap {
@@ -16,6 +17,7 @@ export interface TLEventMap {
 	tick: [number]
 	frame: [number]
 	'select-all-text': [{ shapeId: TLShapeId }]
+	'camera-options-changed': [TLCameraOptions]
 }
 
 /** @public */