[Sheets] [Pt. 12] Add event for selected snap point change (#5584)

Co-authored-by: Eric Bailey <git@esb.lol>
Co-authored-by: Samuel Newman <mozzius@protonmail.com>

modules/bottom-sheet/index.ts

@@ -1,4 +1,13 @@
-import {BottomSheetState, BottomSheetViewProps} from './src/BottomSheet.types'
+import {
+  BottomSheetSnapPoint,
+  BottomSheetState,
+  BottomSheetViewProps,
+} from './src/BottomSheet.types'
 import {BottomSheetView} from './src/BottomSheetView'
 
-export {type BottomSheetState, BottomSheetView, type BottomSheetViewProps}
+export {
+  BottomSheetSnapPoint,
+  type BottomSheetState,
+  BottomSheetView,
+  type BottomSheetViewProps,
+}

modules/bottom-sheet/ios/BottomSheetModule.swift

@@ -10,8 +10,9 @@ public class BottomSheetModule: Module {
 
     View(SheetView.self) {
       Events([
+        "onAttemptDismiss",
+        "onSnapPointChange",
         "onStateChange",
-        "onAttemptDismiss"
       ])
 
       AsyncFunction("dismiss") { (view: SheetView) in
@@ -26,10 +27,6 @@ public class BottomSheetModule: Module {
         view.cornerRadius = CGFloat(prop)
       }
 
-      Prop("preventDismiss") { (view: SheetView, prop: Bool) in
-        view.preventDismiss = prop
-      }
-
       Prop("minHeight") { (view: SheetView, prop: Double) in
         view.minHeight = prop
       }
@@ -38,6 +35,10 @@ public class BottomSheetModule: Module {
         view.maxHeight = prop
       }
 
+      Prop("preventDismiss") { (view: SheetView, prop: Bool) in
+        view.preventDismiss = prop
+      }
+
       Prop("preventExpansion") { (view: SheetView, prop: Bool) in
         view.preventExpansion = prop
       }

modules/bottom-sheet/ios/SheetView.swift

@@ -7,8 +7,9 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
   private var innerView: UIView?
 
   // Events
-  private let onStateChange = EventDispatcher()
   private let onAttemptDismiss = EventDispatcher()
+  private let onSnapPointChange = EventDispatcher()
+  private let onStateChange = EventDispatcher()
 
   // Open event firing
   private var isOpen: Bool = false {
@@ -51,6 +52,19 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
       }
     }
   }
+  private var selectedDetentIdentifier: UISheetPresentationController.Detent.Identifier? {
+    didSet {
+      if selectedDetentIdentifier == .large {
+        onSnapPointChange([
+          "snapPoint": 2
+        ])
+      } else {
+        onSnapPointChange([
+          "snapPoint": 1
+        ])
+      }
+    }
+  }
 
   // MARK: - Lifecycle
 
@@ -103,11 +117,12 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
     }
 
     let sheetVc = SheetViewController()
+    sheetVc.setDetents(contentHeight: self.clampHeight(contentHeight), preventExpansion: self.preventExpansion)
     if let sheet = sheetVc.sheetPresentationController {
       sheet.delegate = self
       sheet.preferredCornerRadius = self.cornerRadius
+      self.selectedDetentIdentifier = sheet.selectedDetentIdentifier
     }
-    sheetVc.setDetents(contentHeight: self.clampHeight(contentHeight), preventExpansion: self.preventExpansion)
     sheetVc.view.addSubview(innerView)
 
     self.sheetVc = sheetVc
@@ -158,4 +173,8 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
   func presentationControllerDidDismiss(_ presentationController: UIPresentationController) {
     self.destroy()
   }
+
+  func sheetPresentationControllerDidChangeSelectedDetentIdentifier(_ sheetPresentationController: UISheetPresentationController) {
+    self.selectedDetentIdentifier = sheetPresentationController.selectedDetentIdentifier
+  }
 }

modules/bottom-sheet/src/BottomSheet.types.ts

@@ -3,6 +3,12 @@ import {ColorValue, NativeSyntheticEvent} from 'react-native'
 
 export type BottomSheetState = 'closed' | 'closing' | 'open' | 'opening'
 
+export enum BottomSheetSnapPoint {
+  Hidden,
+  Partial,
+  Full,
+}
+
 export interface BottomSheetViewProps {
   children: React.ReactNode
   cornerRadius?: number
@@ -15,6 +21,10 @@ export interface BottomSheetViewProps {
   minHeight?: number
   maxHeight?: number
 
+  onAttemptDismiss?: (event: NativeSyntheticEvent<object>) => void
+  onSnapPointChange?: (
+    event: NativeSyntheticEvent<{snapPoint: BottomSheetSnapPoint}>,
+  ) => void
   onStateChange?: (
     event: NativeSyntheticEvent<{state: BottomSheetState}>,
   ) => void

src/components/Button.tsx

@@ -122,11 +122,13 @@ export const Button = React.forwardRef<View, ButtonProps>(
     },
     ref,
   ) => {
-    // This will pick the correct default pressable to use. If we are inside a dialog, we need to use the RNGH
-    // pressable so that it is usable inside the dialog.
-    const {insideDialog} = useDialogContext()
+    /*
+     * This will pick the correct default pressable to use. If we are inside a
+     * native dialog, we need to use the RNGH pressable.
+     */
+    const {isNativeDialog} = useDialogContext()
     if (!PressableComponent) {
-      if (insideDialog) {
+      if (isNativeDialog) {
         PressableComponent = NormalizedRNGHPressable
       } else {
         PressableComponent = Pressable
@@ -468,7 +470,7 @@ export const Button = React.forwardRef<View, ButtonProps>(
         role="button"
         accessibilityHint={undefined} // optional
         {...rest}
-        // @ts-expect-error ref type
+        // @ts-ignore - this will always be a pressable
         ref={ref}
         aria-label={label}
         aria-pressed={state.pressed}

src/components/Dialog/context.ts

@@ -6,10 +6,12 @@ import {
   DialogControlRefProps,
   DialogOuterProps,
 } from '#/components/Dialog/types'
+import {BottomSheetSnapPoint} from '../../../modules/bottom-sheet/src/BottomSheet.types'
 
 export const Context = React.createContext<DialogContextProps>({
   close: () => {},
-  insideDialog: false,
+  isNativeDialog: false,
+  nativeSnapPoint: BottomSheetSnapPoint.Hidden,
 })
 
 export function useDialogContext() {

src/components/Dialog/index.tsx

@@ -8,7 +8,7 @@ import {isIOS} from '#/platform/detection'
 import {useDialogStateControlContext} from '#/state/dialogs'
 import {List, ListMethods, ListProps} from '#/view/com/util/List'
 import {atoms as a, flatten, useTheme} from '#/alf'
-import {Context} from '#/components/Dialog/context'
+import {Context, useDialogContext} from '#/components/Dialog/context'
 import {
   DialogControlProps,
   DialogInnerProps,
@@ -16,7 +16,10 @@ import {
 } from '#/components/Dialog/types'
 import {createInput} from '#/components/forms/TextField'
 import {Portal} from '#/components/Portal'
-import {BottomSheetView} from '../../../modules/bottom-sheet'
+import {
+  BottomSheetSnapPoint,
+  BottomSheetView,
+} from '../../../modules/bottom-sheet'
 
 export {useDialogContext, useDialogControl} from '#/components/Dialog/context'
 export * from '#/components/Dialog/types'
@@ -57,6 +60,10 @@ export function OuterWithoutPortal({
   const closeCallbacks = React.useRef<(() => void)[]>([])
   const {setDialogIsOpen} = useDialogStateControlContext()
 
+  const [snapPoint, setSnapPoint] = React.useState<BottomSheetSnapPoint>(
+    BottomSheetSnapPoint.Partial,
+  )
+
   const callQueuedCallbacks = React.useCallback(() => {
     for (const cb of closeCallbacks.current) {
       try {
@@ -103,7 +110,10 @@ export function OuterWithoutPortal({
     [open, close],
   )
 
-  const context = React.useMemo(() => ({close, insideDialog: true}), [close])
+  const context = React.useMemo(
+    () => ({close, isNativeDialog: true, nativeSnapPoint: snapPoint}),
+    [close, snapPoint],
+  )
 
   const Wrapper = isIOS ? View : GestureHandlerRootView
 
@@ -113,6 +123,9 @@ export function OuterWithoutPortal({
         ref={ref}
         topInset={30}
         bottomInset={insets.bottom}
+        onSnapPointChange={e => {
+          setSnapPoint(e.nativeEvent.snapPoint)
+        }}
         onStateChange={e => {
           if (e.nativeEvent.state === 'closed') {
             onCloseAnimationComplete()
@@ -147,8 +160,12 @@ export function Inner({children, style}: DialogInnerProps) {
 export const ScrollableInner = React.forwardRef<ScrollView, DialogInnerProps>(
   function ScrollableInner({children, style}, ref) {
     const insets = useSafeAreaInsets()
+    const {nativeSnapPoint} = useDialogContext()
     return (
-      <ScrollView style={[a.px_xl, style]} ref={ref}>
+      <ScrollView
+        style={[a.px_xl, style]}
+        ref={ref}
+        bounces={nativeSnapPoint === BottomSheetSnapPoint.Full}>
         {children}
         <View style={{height: insets.bottom + a.pt_5xl.paddingTop}} />
       </ScrollView>

src/components/Dialog/index.web.tsx

@@ -103,7 +103,8 @@ export function Outer({
   const context = React.useMemo(
     () => ({
       close,
-      insideDialog: true,
+      isNativeDialog: false,
+      nativeSnapPoint: 0,
     }),
     [close],
   )

src/components/Dialog/types.ts

@@ -7,6 +7,7 @@ import type {
 
 import {ViewStyleProp} from '#/alf'
 import {BottomSheetViewProps} from '../../../modules/bottom-sheet'
+import {BottomSheetSnapPoint} from '../../../modules/bottom-sheet/src/BottomSheet.types'
 
 type A11yProps = Required<AccessibilityProps>
 
@@ -37,7 +38,8 @@ export type DialogControlProps = DialogControlRefProps & {
 
 export type DialogContextProps = {
   close: DialogControlProps['close']
-  insideDialog: boolean
+  isNativeDialog: boolean
+  nativeSnapPoint: BottomSheetSnapPoint
 }
 
 export type DialogControlOpenOptions = {

src/components/NormalizedRNGHPressable.tsx

@@ -115,6 +115,8 @@ export class NormalizedRNGHPressable extends React.Component<PressableProps> {
   render() {
     return (
       <BSPressable
+        accessible={true}
+        accessibilityRole="button"
         {...this.props}
         onPress={this.onPress}
         onLongPress={this.onLongPress}