1 line
36 KiB
Plaintext
1 line
36 KiB
Plaintext
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This component is based on RN's DrawerLayoutAndroid API\n//\n// It perhaps deserves to be put in a separate repo, but since it relies\n// on react-native-gesture-handler library which isn't very popular at the\n// moment I decided to keep it here for the time being. It will allow us\n// to move faster and fix issues that may arise in gesture handler library\n// that could be found when using the drawer component\n\nimport * as React from 'react';\nimport { Component } from 'react';\nimport invariant from 'invariant';\nimport {\n Animated,\n StyleSheet,\n View,\n Keyboard,\n StatusBar,\n I18nManager,\n StatusBarAnimation,\n StyleProp,\n ViewStyle,\n LayoutChangeEvent,\n NativeSyntheticEvent,\n} from 'react-native';\n\nimport {\n GestureEvent,\n PanGestureHandler,\n PanGestureHandlerEventPayload,\n TapGestureHandler,\n HandlerStateChangeEvent,\n TapGestureHandlerEventPayload,\n} from '../handlers/gestureHandlers';\nimport { State } from '../State';\n\nconst DRAG_TOSS = 0.05;\n\nconst IDLE: DrawerState = 'Idle';\nconst DRAGGING: DrawerState = 'Dragging';\nconst SETTLING: DrawerState = 'Settling';\n\nexport type DrawerPosition = 'left' | 'right';\n\nexport type DrawerState = 'Idle' | 'Dragging' | 'Settling';\n\nexport type DrawerType = 'front' | 'back' | 'slide';\n\nexport type DrawerLockMode = 'unlocked' | 'locked-closed' | 'locked-open';\n\nexport type DrawerKeyboardDismissMode = 'none' | 'on-drag';\n\nexport interface DrawerLayoutProps {\n renderNavigationView: (\n progressAnimatedValue: Animated.Value\n ) => React.ReactNode;\n drawerPosition?: DrawerPosition;\n drawerWidth?: number;\n drawerBackgroundColor?: string;\n drawerLockMode?: DrawerLockMode;\n keyboardDismissMode?: DrawerKeyboardDismissMode;\n onDrawerClose?: () => void;\n onDrawerOpen?: () => void;\n onDrawerStateChanged?: (\n newState: DrawerState,\n drawerWillShow: boolean\n ) => void;\n useNativeAnimations?: boolean;\n\n drawerType?: DrawerType;\n edgeWidth?: number;\n minSwipeDistance?: number;\n hideStatusBar?: boolean;\n statusBarAnimation?: StatusBarAnimation;\n overlayColor?: string;\n contentContainerStyle?: StyleProp<ViewStyle>;\n drawerContainerStyle?: StyleProp<ViewStyle>;\n enableTrackpadTwoFingerGesture?: boolean;\n onDrawerSlide?: (position: number) => void;\n onGestureRef?: (ref: PanGestureHandler) => void;\n}\n\nexport type DrawerLayoutState = {\n dragX: Animated.Value;\n touchX: Animated.Value;\n drawerTranslation: Animated.Value;\n containerWidth: number;\n};\n\nexport type DrawerMovementOption = {\n velocity?: number;\n speed?: number;\n};\nexport default class DrawerLayout extends Component<\n DrawerLayoutProps,\n DrawerLayoutState\n> {\n static defaultProps = {\n drawerWidth: 200,\n drawerPosition: 'left',\n useNativeAnimations: true,\n drawerType: 'front',\n edgeWidth: 20,\n minSwipeDistance: 3,\n overlayColor: 'rgba(0, 0, 0, 0.7)',\n drawerLockMode: 'unlocked',\n enableTrackpadTwoFingerGesture: false,\n };\n\n constructor(props: DrawerLayoutProps) {\n super(props);\n\n const dragX = new Animated.Value(0);\n const touchX = new Animated.Value(0);\n const drawerTranslation = new Animated.Value(0);\n\n this.state = {\n dragX,\n touchX,\n drawerTranslation,\n containerWidth: 0,\n };\n\n this.updateAnimatedEvent(props, this.state);\n }\n\n UNSAFE_componentWillUpdate(\n props: DrawerLayoutProps,\n state: DrawerLayoutState\n ) {\n if (\n this.props.drawerPosition !== props.drawerPosition ||\n this.props.drawerWidth !== props.drawerWidth ||\n this.props.drawerType !== props.drawerType ||\n this.state.containerWidth !== state.containerWidth\n ) {\n this.updateAnimatedEvent(props, state);\n }\n }\n\n private openValue?: Animated.AnimatedInterpolation;\n private onGestureEvent?: (\n event: GestureEvent<PanGestureHandlerEventPayload>\n ) => void;\n private accessibilityIsModalView = React.createRef<View>();\n private pointerEventsView = React.createRef<View>();\n private panGestureHandler = React.createRef<PanGestureHandler | null>();\n private drawerShown = false;\n\n static positions = {\n Left: 'left',\n Right: 'right',\n };\n\n private updateAnimatedEvent = (\n props: DrawerLayoutProps,\n state: DrawerLayoutState\n ) => {\n // Event definition is based on\n const { drawerPosition, drawerWidth, drawerType } = props;\n const {\n dragX: dragXValue,\n touchX: touchXValue,\n drawerTranslation,\n containerWidth,\n } = state;\n\n let dragX = dragXValue;\n let touchX = touchXValue;\n\n if (drawerPosition !== 'left') {\n // Most of the code is written in a way to handle left-side drawer.\n // In order to handle right-side drawer the only thing we need to\n // do is to reverse events coming from gesture handler in a way they\n // emulate left-side drawer gestures. E.g. dragX is simply -dragX, and\n // touchX is calulcated by subtracing real touchX from the width of the\n // container (such that when touch happens at the right edge the value\n // is simply 0)\n dragX = Animated.multiply(\n new Animated.Value(-1),\n dragXValue\n ) as Animated.Value; // TODO(TS): (for all \"as\" in this file) make sure we can map this\n touchX = Animated.add(\n new Animated.Value(containerWidth),\n Animated.multiply(new Animated.Value(-1), touchXValue)\n ) as Animated.Value; // TODO(TS): make sure we can map this;\n touchXValue.setValue(containerWidth);\n } else {\n touchXValue.setValue(0);\n }\n\n // While closing the drawer when user starts gesture outside of its area (in greyed\n // out part of the window), we want the drawer to follow only once finger reaches the\n // edge of the drawer.\n // E.g. on the diagram below drawer is illustrate by X signs and the greyed out area by\n // dots. The touch gesture starts at '*' and moves left, touch path is indicated by\n // an arrow pointing left\n // 1) +---------------+ 2) +---------------+ 3) +---------------+ 4) +---------------+\n // |XXXXXXXX|......| |XXXXXXXX|......| |XXXXXXXX|......| |XXXXX|.........|\n // |XXXXXXXX|......| |XXXXXXXX|......| |XXXXXXXX|......| |XXXXX|.........|\n // |XXXXXXXX|......| |XXXXXXXX|......| |XXXXXXXX|......| |XXXXX|.........|\n // |XXXXXXXX|......| |XXXXXXXX|.<-*..| |XXXXXXXX|<--*..| |XXXXX|<-----*..|\n // |XXXXXXXX|......| |XXXXXXXX|......| |XXXXXXXX|......| |XXXXX|.........|\n // |XXXXXXXX|......| |XXXXXXXX|......| |XXXXXXXX|......| |XXXXX|.........|\n // |XXXXXXXX|......| |XXXXXXXX|......| |XXXXXXXX|......| |XXXXX|.........|\n // +---------------+ +---------------+ +---------------+ +---------------+\n //\n // For the above to work properly we define animated value that will keep start position\n // of the gesture. Then we use that value to calculate how much we need to subtract from\n // the dragX. If the gesture started on the greyed out area we take the distance from the\n // edge of the drawer to the start position. Otherwise we don't subtract at all and the\n // drawer be pulled back as soon as you start the pan.\n //\n // This is used only when drawerType is \"front\"\n //\n let translationX = dragX;\n if (drawerType === 'front') {\n const startPositionX = Animated.add(\n touchX,\n Animated.multiply(new Animated.Value(-1), dragX)\n );\n\n const dragOffsetFromOnStartPosition = startPositionX.interpolate({\n inputRange: [drawerWidth! - 1, drawerWidth!, drawerWidth! + 1],\n outputRange: [0, 0, 1],\n });\n translationX = Animated.add(\n dragX,\n dragOffsetFromOnStartPosition\n ) as Animated.Value; // TODO: as above\n }\n\n this.openValue = Animated.add(translationX, drawerTranslation).interpolate({\n inputRange: [0, drawerWidth!],\n outputRange: [0, 1],\n extrapolate: 'clamp',\n });\n\n const gestureOptions: {\n useNativeDriver: boolean;\n // TODO: make sure it is correct\n listener?: (\n ev: NativeSyntheticEvent<PanGestureHandlerEventPayload>\n ) => void;\n } = {\n useNativeDriver: props.useNativeAnimations!,\n };\n\n if (this.props.onDrawerSlide) {\n gestureOptions.listener = (ev) => {\n const translationX = Math.floor(Math.abs(ev.nativeEvent.translationX));\n const position = translationX / this.state.containerWidth;\n\n this.props.onDrawerSlide?.(position);\n };\n }\n\n this.onGestureEvent = Animated.event(\n [{ nativeEvent: { translationX: dragXValue, x: touchXValue } }],\n gestureOptions\n );\n };\n\n private handleContainerLayout = ({ nativeEvent }: LayoutChangeEvent) => {\n this.setState({ containerWidth: nativeEvent.layout.width });\n };\n\n private emitStateChanged = (\n newState: DrawerState,\n drawerWillShow: boolean\n ) => {\n this.props.onDrawerStateChanged?.(newState, drawerWillShow);\n };\n\n private openingHandlerStateChange = ({\n nativeEvent,\n }: HandlerStateChangeEvent<PanGestureHandlerEventPayload>) => {\n if (nativeEvent.oldState === State.ACTIVE) {\n this.handleRelease({ nativeEvent });\n } else if (nativeEvent.state === State.ACTIVE) {\n this.emitStateChanged(DRAGGING, false);\n if (this.props.keyboardDismissMode === 'on-drag') {\n Keyboard.dismiss();\n }\n if (this.props.hideStatusBar) {\n StatusBar.setHidden(true, this.props.statusBarAnimation || 'slide');\n }\n }\n };\n\n private onTapHandlerStateChange = ({\n nativeEvent,\n }: HandlerStateChangeEvent<TapGestureHandlerEventPayload>) => {\n if (\n this.drawerShown &&\n nativeEvent.oldState === State.ACTIVE &&\n this.props.drawerLockMode !== 'locked-open'\n ) {\n this.closeDrawer();\n }\n };\n\n private handleRelease = ({\n nativeEvent,\n }: HandlerStateChangeEvent<PanGestureHandlerEventPayload>) => {\n const { drawerWidth, drawerPosition, drawerType } = this.props;\n const { containerWidth } = this.state;\n let { translationX: dragX, velocityX, x: touchX } = nativeEvent;\n\n if (drawerPosition !== 'left') {\n // See description in _updateAnimatedEvent about why events are flipped\n // for right-side drawer\n dragX = -dragX;\n touchX = containerWidth - touchX;\n velocityX = -velocityX;\n }\n\n const gestureStartX = touchX - dragX;\n let dragOffsetBasedOnStart = 0;\n\n if (drawerType === 'front') {\n dragOffsetBasedOnStart =\n gestureStartX > drawerWidth! ? gestureStartX - drawerWidth! : 0;\n }\n\n const startOffsetX =\n dragX + dragOffsetBasedOnStart + (this.drawerShown ? drawerWidth! : 0);\n const projOffsetX = startOffsetX + DRAG_TOSS * velocityX;\n\n const shouldOpen = projOffsetX > drawerWidth! / 2;\n\n if (shouldOpen) {\n this.animateDrawer(startOffsetX, drawerWidth!, velocityX);\n } else {\n this.animateDrawer(startOffsetX, 0, velocityX);\n }\n };\n\n private updateShowing = (showing: boolean) => {\n this.drawerShown = showing;\n this.accessibilityIsModalView.current?.setNativeProps({\n accessibilityViewIsModal: showing,\n });\n this.pointerEventsView.current?.setNativeProps({\n pointerEvents: showing ? 'auto' : 'none',\n });\n const { drawerPosition, minSwipeDistance, edgeWidth } = this.props;\n const fromLeft = drawerPosition === 'left';\n // gestureOrientation is 1 if the expected gesture is from left to right and -1 otherwise\n // e.g. when drawer is on the left and is closed we expect left to right gesture, thus\n // orientation will be 1.\n const gestureOrientation =\n (fromLeft ? 1 : -1) * (this.drawerShown ? -1 : 1);\n // When drawer is closed we want the hitSlop to be horizontally shorter\n // than the container size by the value of SLOP. This will make it only\n // activate when gesture happens not further than SLOP away from the edge\n const hitSlop = fromLeft\n ? { left: 0, width: showing ? undefined : edgeWidth }\n : { right: 0, width: showing ? undefined : edgeWidth };\n // @ts-ignore internal API, maybe could be fixed in handler types\n this.panGestureHandler.current?.setNativeProps({\n hitSlop,\n activeOffsetX: gestureOrientation * minSwipeDistance!,\n });\n };\n\n private animateDrawer = (\n fromValue: number | null | undefined,\n toValue: number,\n velocity: number,\n speed?: number\n ) => {\n this.state.dragX.setValue(0);\n this.state.touchX.setValue(\n this.props.drawerPosition === 'left' ? 0 : this.state.containerWidth\n );\n\n if (fromValue != null) {\n let nextFramePosition = fromValue;\n if (this.props.useNativeAnimations) {\n // When using native driver, we predict the next position of the animation\n // because it takes one frame of a roundtrip to pass RELEASE event from\n // native driver to JS before we can start animating. Without it, it is more\n // noticable that the frame is dropped.\n if (fromValue < toValue && velocity > 0) {\n nextFramePosition = Math.min(fromValue + velocity / 60.0, toValue);\n } else if (fromValue > toValue && velocity < 0) {\n nextFramePosition = Math.max(fromValue + velocity / 60.0, toValue);\n }\n }\n this.state.drawerTranslation.setValue(nextFramePosition);\n }\n\n const willShow = toValue !== 0;\n this.updateShowing(willShow);\n this.emitStateChanged(SETTLING, willShow);\n if (this.props.hideStatusBar) {\n StatusBar.setHidden(willShow, this.props.statusBarAnimation || 'slide');\n }\n Animated.spring(this.state.drawerTranslation, {\n velocity,\n bounciness: 0,\n toValue,\n useNativeDriver: this.props.useNativeAnimations!,\n speed: speed ?? undefined,\n }).start(({ finished }) => {\n if (finished) {\n this.emitStateChanged(IDLE, willShow);\n if (willShow) {\n this.props.onDrawerOpen?.();\n } else {\n this.props.onDrawerClose?.();\n }\n }\n });\n };\n\n openDrawer = (options: DrawerMovementOption = {}) => {\n this.animateDrawer(\n // TODO: decide if it should be null or undefined is the proper value\n undefined,\n this.props.drawerWidth!,\n options.velocity ? options.velocity : 0\n );\n\n // We need to force the update, otherwise the overlay is not rerendered and it would not be clickable\n this.forceUpdate();\n };\n\n closeDrawer = (options: DrawerMovementOption = {}) => {\n // TODO: decide if it should be null or undefined is the proper value\n this.animateDrawer(undefined, 0, options.velocity ? options.velocity : 0);\n\n // We need to force the update, otherwise the overlay is not rerendered and it would be still clickable\n this.forceUpdate();\n };\n\n private renderOverlay = () => {\n /* Overlay styles */\n invariant(this.openValue, 'should be set');\n const overlayOpacity = this.openValue.interpolate({\n inputRange: [0, 1],\n outputRange: [0, 1],\n extrapolate: 'clamp',\n });\n const dynamicOverlayStyles = {\n opacity: overlayOpacity,\n backgroundColor: this.props.overlayColor,\n };\n\n return (\n <TapGestureHandler onHandlerStateChange={this.onTapHandlerStateChange}>\n <Animated.View\n pointerEvents={this.drawerShown ? 'auto' : 'none'}\n ref={this.pointerEventsView}\n style={[styles.overlay, dynamicOverlayStyles]}\n />\n </TapGestureHandler>\n );\n };\n\n private renderDrawer = () => {\n const {\n drawerBackgroundColor,\n drawerWidth,\n drawerPosition,\n drawerType,\n drawerContainerStyle,\n contentContainerStyle,\n } = this.props;\n\n const fromLeft = drawerPosition === 'left';\n const drawerSlide = drawerType !== 'back';\n const containerSlide = drawerType !== 'front';\n\n // we rely on row and row-reverse flex directions to position the drawer\n // properly. Apparently for RTL these are flipped which requires us to use\n // the opposite setting for the drawer to appear from left or right according\n // to the drawerPosition prop\n const reverseContentDirection = I18nManager.isRTL ? fromLeft : !fromLeft;\n\n const dynamicDrawerStyles = {\n backgroundColor: drawerBackgroundColor,\n width: drawerWidth,\n };\n const openValue = this.openValue;\n invariant(openValue, 'should be set');\n\n let containerStyles;\n if (containerSlide) {\n const containerTranslateX = openValue.interpolate({\n inputRange: [0, 1],\n outputRange: fromLeft ? [0, drawerWidth!] : [0, -drawerWidth!],\n extrapolate: 'clamp',\n });\n containerStyles = {\n transform: [{ translateX: containerTranslateX }],\n };\n }\n\n let drawerTranslateX: number | Animated.AnimatedInterpolation = 0;\n if (drawerSlide) {\n const closedDrawerOffset = fromLeft ? -drawerWidth! : drawerWidth!;\n drawerTranslateX = openValue.interpolate({\n inputRange: [0, 1],\n outputRange: [closedDrawerOffset, 0],\n extrapolate: 'clamp',\n });\n }\n const drawerStyles: {\n transform: { translateX: number | Animated.AnimatedInterpolation }[];\n flexDirection: 'row-reverse' | 'row';\n } = {\n transform: [{ translateX: drawerTranslateX }],\n flexDirection: reverseContentDirection ? 'row-reverse' : 'row',\n };\n\n return (\n <Animated.View style={styles.main} onLayout={this.handleContainerLayout}>\n <Animated.View\n style={[\n drawerType === 'front'\n ? styles.containerOnBack\n : styles.containerInFront,\n containerStyles,\n contentContainerStyle,\n ]}\n importantForAccessibility={\n this.drawerShown ? 'no-hide-descendants' : 'yes'\n }>\n {typeof this.props.children === 'function'\n ? this.props.children(this.openValue)\n : this.props.children}\n {this.renderOverlay()}\n </Animated.View>\n <Animated.View\n pointerEvents=\"box-none\"\n ref={this.accessibilityIsModalView}\n accessibilityViewIsModal={this.drawerShown}\n style={[styles.drawerContainer, drawerStyles, drawerContainerStyle]}>\n <View style={dynamicDrawerStyles}>\n {this.props.renderNavigationView(this.openValue as Animated.Value)}\n </View>\n </Animated.View>\n </Animated.View>\n );\n };\n\n private setPanGestureRef = (ref: PanGestureHandler) => {\n // TODO(TS): make sure it is OK\n // taken from https://github.com/DefinitelyTyped/DefinitelyTyped/issues/31065#issuecomment-596081842\n (this\n .panGestureHandler as React.MutableRefObject<PanGestureHandler>).current = ref;\n this.props.onGestureRef?.(ref);\n };\n\n render() {\n const {\n drawerPosition,\n drawerLockMode,\n edgeWidth,\n minSwipeDistance,\n } = this.props;\n\n const fromLeft = drawerPosition === 'left';\n\n // gestureOrientation is 1 if the expected gesture is from left to right and -1 otherwise\n // e.g. when drawer is on the left and is closed we expect left to right gesture, thus\n // orientation will be 1.\n const gestureOrientation =\n (fromLeft ? 1 : -1) * (this.drawerShown ? -1 : 1);\n\n // When drawer is closed we want the hitSlop to be horizontally shorter\n // than the container size by the value of SLOP. This will make it only\n // activate when gesture happens not further than SLOP away from the edge\n const hitSlop = fromLeft\n ? { left: 0, width: this.drawerShown ? undefined : edgeWidth }\n : { right: 0, width: this.drawerShown ? undefined : edgeWidth };\n\n return (\n <PanGestureHandler\n // @ts-ignore could be fixed in handler types\n ref={this.setPanGestureRef}\n hitSlop={hitSlop}\n activeOffsetX={gestureOrientation * minSwipeDistance!}\n failOffsetY={[-15, 15]}\n onGestureEvent={this.onGestureEvent}\n onHandlerStateChange={this.openingHandlerStateChange}\n enableTrackpadTwoFingerGesture={\n this.props.enableTrackpadTwoFingerGesture\n }\n enabled={\n drawerLockMode !== 'locked-closed' && drawerLockMode !== 'locked-open'\n }>\n {this.renderDrawer()}\n </PanGestureHandler>\n );\n }\n}\n\nconst styles = StyleSheet.create({\n drawerContainer: {\n ...StyleSheet.absoluteFillObject,\n zIndex: 1001,\n flexDirection: 'row',\n },\n containerInFront: {\n ...StyleSheet.absoluteFillObject,\n zIndex: 1002,\n },\n containerOnBack: {\n ...StyleSheet.absoluteFillObject,\n },\n main: {\n flex: 1,\n zIndex: 0,\n overflow: 'hidden',\n },\n overlay: {\n ...StyleSheet.absoluteFillObject,\n zIndex: 1000,\n },\n});\n"]} |