feat: add source to RESIZE events

Fixes #53

README.md

@@ -191,7 +191,10 @@ If the user reopens the sheet before it's done animating it'll trigger this even
 
 #### RESIZE
 
-Fires whenever there's been a window resize event, or if the header, footer or content have changed its height in such a way that the valid snap points have changed. In the future (#53) you'll be able to differentiate between what triggered the resize.
+Type: `{ source: 'window' | 'maxheightprop' | 'element }`
+
+Fires whenever there's been a window resize event, or if the header, footer or content have changed its height in such a way that the valid snap points have changed.
+`source` tells you what caused the resize. If the resize comes from a `window.onresize` event it's set to `'window'`. `'maxheightprop'` is if the `maxHeight` prop is used, and is fired whenever it changes. And `'element'` is whenever the header, footer or content resize observers detect a change.
 
 #### SNAP
 

src/BottomSheet.tsx

@@ -29,6 +29,7 @@ import type {
   defaultSnapProps,
   Props,
   RefHandles,
+  ResizeSource,
   SnapPointProps,
 } from './types'
 import { debugging } from './utils'
@@ -99,6 +100,7 @@ export const BottomSheet = React.forwardRef<
 
   // Keeps track of the current height, or the height transitioning to
   const heightRef = useRef(0)
+  const resizeSourceRef = useRef<ResizeSource>()
 
   const prefersReducedMotion = useReducedMotion()
 
@@ -131,6 +133,7 @@ export const BottomSheet = React.forwardRef<
     lastSnapRef,
     ready,
     registerReady,
+    resizeSourceRef,
   })
 
   // Setup refs that are used in cases where full control is needed over when a side effect is executed
@@ -196,7 +199,11 @@ export const BottomSheet = React.forwardRef<
         []
       ),
       onResizeCancel: useCallback(
-        () => onSpringCancelRef.current?.({ type: 'RESIZE' }),
+        () =>
+          onSpringCancelRef.current?.({
+            type: 'RESIZE',
+            source: resizeSourceRef.current,
+          }),
         []
       ),
       onOpenEnd: useCallback(
@@ -212,7 +219,11 @@ export const BottomSheet = React.forwardRef<
         []
       ),
       onResizeEnd: useCallback(
-        () => onSpringEndRef.current?.({ type: 'RESIZE' }),
+        () =>
+          onSpringEndRef.current?.({
+            type: 'RESIZE',
+            source: resizeSourceRef.current,
+          }),
         []
       ),
     },
@@ -235,7 +246,11 @@ export const BottomSheet = React.forwardRef<
         []
       ),
       onResizeStart: useCallback(
-        async () => onSpringStartRef.current?.({ type: 'RESIZE' }),
+        async () =>
+          onSpringStartRef.current?.({
+            type: 'RESIZE',
+            source: resizeSourceRef.current,
+          }),
         []
       ),
       onSnapEnd: useCallback(
@@ -255,7 +270,11 @@ export const BottomSheet = React.forwardRef<
         []
       ),
       onResizeEnd: useCallback(
-        async () => onSpringEndRef.current?.({ type: 'RESIZE' }),
+        async () =>
+          onSpringEndRef.current?.({
+            type: 'RESIZE',
+            source: resizeSourceRef.current,
+          }),
         []
       ),
       renderVisuallyHidden: useCallback(

src/hooks/useSnapPoints.tsx

@@ -7,7 +7,7 @@ import React, {
   useState,
 } from 'react'
 import { ResizeObserver, ResizeObserverEntry } from '@juggle/resize-observer'
-import type { defaultSnapProps, snapPoints } from '../types'
+import type { defaultSnapProps, ResizeSource, snapPoints } from '../types'
 import { processSnapPoints, roundAndCheckForNaN } from '../utils'
 import { useReady } from './useReady'
 import { ResizeObserverOptions } from '@juggle/resize-observer/lib/ResizeObserverOptions'
@@ -24,6 +24,7 @@ export function useSnapPoints({
   lastSnapRef,
   ready,
   registerReady,
+  resizeSourceRef,
 }: {
   contentRef: React.RefObject<Element>
   controlledMaxHeight?: number
@@ -36,6 +37,7 @@ export function useSnapPoints({
   lastSnapRef: React.RefObject<number>
   ready: boolean
   registerReady: ReturnType<typeof useReady>['registerReady']
+  resizeSourceRef: React.MutableRefObject<ResizeSource>
 }) {
   const { maxHeight, minHeight, headerHeight, footerHeight } = useDimensions({
     contentRef: contentRef,
@@ -45,6 +47,7 @@ export function useSnapPoints({
     headerEnabled,
     headerRef,
     registerReady,
+    resizeSourceRef,
   })
 
   const { snapPoints, minSnap, maxSnap } = processSnapPoints(
@@ -100,6 +103,7 @@ function useDimensions({
   headerEnabled,
   headerRef,
   registerReady,
+  resizeSourceRef,
 }: {
   contentRef: React.RefObject<Element>
   controlledMaxHeight?: number
@@ -108,24 +112,32 @@ function useDimensions({
   headerEnabled: boolean
   headerRef: React.RefObject<Element>
   registerReady: ReturnType<typeof useReady>['registerReady']
+  resizeSourceRef: React.MutableRefObject<ResizeSource>
 }) {
   const setReady = useMemo(() => registerReady('contentHeight'), [
     registerReady,
   ])
-  const maxHeight = useMaxHeight(controlledMaxHeight, registerReady)
+  const maxHeight = useMaxHeight(
+    controlledMaxHeight,
+    registerReady,
+    resizeSourceRef
+  )
 
   // @TODO probably better to forward props instead of checking refs to decide if it's enabled
   const headerHeight = useElementSizeObserver(headerRef, {
     label: 'headerHeight',
     enabled: headerEnabled,
+    resizeSourceRef,
   })
   const contentHeight = useElementSizeObserver(contentRef, {
     label: 'contentHeight',
     enabled: true,
+    resizeSourceRef,
   })
   const footerHeight = useElementSizeObserver(footerRef, {
     label: 'footerHeight',
     enabled: footerEnabled,
+    resizeSourceRef,
   })
   const minHeight =
     Math.min(maxHeight - headerHeight - footerHeight, contentHeight) +
@@ -161,7 +173,15 @@ const observerOptions: ResizeObserverOptions = {
  */
 function useElementSizeObserver(
   ref: React.RefObject<Element>,
-  { label, enabled }: { label: string; enabled: boolean }
+  {
+    label,
+    enabled,
+    resizeSourceRef,
+  }: {
+    label: string
+    enabled: boolean
+    resizeSourceRef: React.MutableRefObject<ResizeSource>
+  }
 ): number {
   let [size, setSize] = useState(0)
 
@@ -170,6 +190,7 @@ function useElementSizeObserver(
   const handleResize = useCallback((entries: ResizeObserverEntry[]) => {
     // we only observe one element, so accessing the first entry here is fine
     setSize(entries[0].borderBoxSize[0].blockSize)
+    resizeSourceRef.current = 'element'
   }, [])
 
   useEffect(() => {
@@ -191,7 +212,8 @@ function useElementSizeObserver(
 // Blazingly keep track of the current viewport height without blocking the thread, keeping that sweet 60fps on smartphones
 function useMaxHeight(
   controlledMaxHeight,
-  registerReady: ReturnType<typeof useReady>['registerReady']
+  registerReady: ReturnType<typeof useReady>['registerReady'],
+  resizeSourceRef: React.MutableRefObject<ResizeSource>
 ) {
   const setReady = useMemo(() => registerReady('maxHeight'), [registerReady])
   const [maxHeight, setMaxHeight] = useState(() =>
@@ -214,6 +236,7 @@ function useMaxHeight(
     // Bail if the max height is a controlled prop
     if (controlledMaxHeight) {
       setMaxHeight(roundAndCheckForNaN(controlledMaxHeight))
+      resizeSourceRef.current = 'maxheightprop'
 
       return
     }
@@ -227,19 +250,21 @@ function useMaxHeight(
       // throttle state changes using rAF
       raf.current = requestAnimationFrame(() => {
         setMaxHeight(window.innerHeight)
+        resizeSourceRef.current = 'window'
 
         raf.current = 0
       })
     }
     window.addEventListener('resize', handleResize)
     setMaxHeight(window.innerHeight)
+    resizeSourceRef.current = 'window'
     setReady()
 
     return () => {
       window.removeEventListener('resize', handleResize)
       cancelAnimationFrame(raf.current)
     }
-  }, [controlledMaxHeight, setReady])
+  }, [controlledMaxHeight, setReady, resizeSourceRef])
 
   return maxHeight
 }

src/types.ts

@@ -23,6 +23,11 @@ export type SnapPointProps = {
 
 export type snapPoints = (props: SnapPointProps) => number[] | number
 
+/**
+ * `window` comes from window.onresize, maxheightprop is if the `maxHeight` prop is used, and `element` comes from the resize observers that listens to header, footer and the content area
+ */
+export type ResizeSource = 'window' | 'maxheightprop' | 'element'
+
 export type defaultSnapProps = {
   /** The snap points currently in use, this can be controlled by providing a `snapPoints` function on the bottom sheet. */
   snapPoints: number[]
@@ -34,7 +39,7 @@ export type defaultSnapProps = {
 export type SpringEvent =
   | { type: 'OPEN' }
   | { type: 'CLOSE' }
-  | { type: 'RESIZE' }
+  | { type: 'RESIZE'; source: ResizeSource }
   | { type: 'SNAP'; source: 'dragging' | 'custom' | string }
 
 export type Props = {