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July 26, 2018 04:30
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| import React, {Fragment, Component} from 'react'; | |
| import {PanResponder, Dimensions, Animated, Button, TouchableOpacity, FlatList, StyleSheet, Text, View} from 'react-native'; | |
| const CONTACTS = [{ | |
| key: 'c1', | |
| name: 'contact1' | |
| }, { | |
| key: 'c2', | |
| name: 'contact2' | |
| }, { | |
| key: 'c3', | |
| name: 'contact3' | |
| }, { | |
| key: 'c4', | |
| name: 'contact4' | |
| }, { | |
| key: 'c5', | |
| name: 'contact5' | |
| }, { | |
| key: 'c6', | |
| name: 'contact6' | |
| }, { | |
| key: 'c7', | |
| name: 'contact7' | |
| }] | |
| const windowWidth = Dimensions.get('window').width | |
| class ListItem extends React.Component { | |
| state = { | |
| dragging: false, | |
| isDeleting: false, | |
| } | |
| isDeleting = false | |
| constructor(props) { | |
| super(props) | |
| this.pan = new Animated.ValueXY(), | |
| this.inAndOut = new Animated.Value(props.shouldAnimateOnMount ? 0 : 1) | |
| this.panResponder = PanResponder.create({ | |
| onStartShouldSetPanResponder: (evt, gestureState) => true, | |
| onStartShouldSetPanResponderCapture: (evt, gestureState) => true, | |
| onMoveShouldSetPanResponder: (evt, gestureState) => true, | |
| onMoveShouldSetPanResponderCapture: (evt, gestureState) => true, | |
| onPanResponderGrant: (evt, gestureState) => { | |
| this.setState({ | |
| dragging: true, | |
| }) | |
| }, | |
| onPanResponderMove: Animated.event([ | |
| null, | |
| {dx: this.pan.x} | |
| ], { | |
| listener: (event, gesture) => { | |
| if (Math.abs(gesture.dx) > 200 && !this.isDeleting) { | |
| this.handleDeletePress() | |
| } | |
| } | |
| }), | |
| onPanResponderTerminationRequest: (evt, gestureState) => true, | |
| onPanResponderRelease: (evt, gestureState) => { | |
| this.setState({ | |
| dragging: false, | |
| }) | |
| Animated.timing(this.pan, { | |
| toValue: { x: 0, y: 0 }, | |
| duration: 2000 | |
| }).start(); | |
| }, | |
| onPanResponderTerminate: (evt, gestureState) => { | |
| this.setState({ | |
| dragging: false, | |
| }) | |
| }, | |
| onShouldBlockNativeResponder: (evt, gestureState) => { | |
| return true; | |
| }, | |
| }); | |
| } | |
| componentDidMount() { | |
| if (this.props.shouldAnimateOnMount) { | |
| Animated.timing(this.inAndOut, { | |
| toValue: 1, | |
| duration: 200 | |
| }).start() | |
| } | |
| this.props.onMount() | |
| } | |
| handleDeletePress = () => { | |
| if (!this.isDeleting) { | |
| Animated.timing(this.inAndOut, { | |
| toValue: 0, | |
| duration: 2000 | |
| }).start(this.props.onDelete) | |
| this.isDeleting = true | |
| } | |
| } | |
| render() { | |
| const { | |
| name, | |
| } = this.props | |
| const height = this.inAndOut.interpolate({ | |
| inputRange: [0, 1], | |
| outputRange: [0, 50], | |
| extrapolate: 'clamp' | |
| }) | |
| const backgroundColor = this.state.dragging ? '#a1a1a1' : '#d3d3d3' | |
| const deleteViewAnimatedStyle = { | |
| transform: [ | |
| {translateX: this.pan.x} | |
| ], | |
| } | |
| return ( | |
| <Animated.View style={{ height }}> | |
| <View | |
| {...this.panResponder.panHandlers} | |
| style={[styles.contactWrapper, { backgroundColor }]}> | |
| <Text>{name}</Text> | |
| </View> | |
| <Animated.View style={[deleteViewAnimatedStyle, styles.deleteView]}/> | |
| </Animated.View> | |
| ) | |
| } | |
| } | |
| export default class App extends Component { | |
| state = { | |
| contacts: CONTACTS, | |
| deletedContacts: [], | |
| } | |
| hasRenderedOnce = {} | |
| timeouts = {} | |
| handleDelete = (contactId) => { | |
| this.setState({ | |
| deletedContacts: { | |
| ...this.state.deletedContacts, | |
| [contactId]: true | |
| } | |
| }) | |
| this.timeouts[contactId] = setTimeout(() => { | |
| this.setState({ | |
| contacts: this.state.contacts.filter(contact => contact.key !== contactId), | |
| deletedContacts: { | |
| ...this.state.deletedContacts, | |
| [contactId]: false, | |
| } | |
| }) | |
| }, 5000) | |
| } | |
| handleListItemMount = (contactId) => { | |
| this.hasRenderedOnce[contactId] = true | |
| } | |
| renderItem = ({ item }) => { | |
| return ( | |
| <ListItem | |
| id={item.key} | |
| name={item.name} | |
| onDelete={() => this.handleDelete(item.key)} | |
| shouldAnimateOnMount={this.hasRenderedOnce[item.key]} | |
| onMount={() => this.handleListItemMount(item.key)} | |
| /> | |
| ) | |
| } | |
| renderSeparator = () => { | |
| return ( | |
| <View | |
| style={{ | |
| height: StyleSheet.hairlineWidth, | |
| backgroundColor: "#000", | |
| }} | |
| /> | |
| ); | |
| } | |
| restoreContact = (deletedContactId) => { | |
| const timeout = this.timeouts[deletedContactId] | |
| if (timeout) { | |
| clearTimeout(timeout) | |
| } | |
| this.setState({ | |
| deletedContacts: { | |
| ...this.state.deletedContacts, | |
| [deletedContactId]: false, | |
| } | |
| }) | |
| } | |
| render() { | |
| return ( | |
| <View style={styles.container}> | |
| <FlatList | |
| style={{backgroundColor: '#c3c3c3', flex: 1}} | |
| data={this.state.contacts.filter(contact => !this.state.deletedContacts[contact.key])} | |
| renderItem={this.renderItem} | |
| ItemSeparatorComponent={this.renderSeparator} | |
| ListFooterComponent={this.renderSeparator} | |
| scrollEnabled={false} | |
| /> | |
| {Object.keys(this.state.deletedContacts).filter(x => this.state.deletedContacts[x]).map(deletedContact => ( | |
| <Button | |
| key={deletedContact} | |
| title={`Restore ${deletedContact}`} | |
| onPress={() => this.restoreContact(deletedContact)} | |
| /> | |
| ))} | |
| </View> | |
| ); | |
| } | |
| } | |
| const styles = StyleSheet.create({ | |
| container: { | |
| flex: 1, | |
| backgroundColor: '#F5FCFF', | |
| paddingTop: 22 | |
| }, | |
| deleteView: { | |
| backgroundColor: '#c0392b', | |
| width: windowWidth, | |
| top: 0, | |
| bottom: 0, | |
| right: -windowWidth, | |
| position: 'absolute' | |
| }, | |
| contactWrapper: { | |
| flex: 1, | |
| justifyContent: 'center', | |
| } | |
| }); |
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