react-native/RNTester/js/examples/Pressable/PressableExample.js

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * @flow strict-local
 */

'use strict';

import * as React from 'react';
import {
  Animated,
  Pressable,
  StyleSheet,
  Text,
  Platform,
  View,
} from 'react-native';

const {useEffect, useRef, useState} = React;

const forceTouchAvailable =
  (Platform.OS === 'ios' && Platform.constants.forceTouchAvailable) || false;

function ContentPress() {
  const [timesPressed, setTimesPressed] = useState(0);

  let textLog = '';
  if (timesPressed > 1) {
    textLog = timesPressed + 'x onPress';
  } else if (timesPressed > 0) {
    textLog = 'onPress';
  }

  return (
    <>
      <View style={styles.row}>
        <Pressable
          onPress={() => {
            setTimesPressed(current => current + 1);
          }}>
          {({pressed}) => (
            <Text style={styles.text}>{pressed ? 'Pressed!' : 'Press Me'}</Text>
          )}
        </Pressable>
      </View>
      <View style={styles.logBox}>
        <Text testID="pressable_press_console">{textLog}</Text>
      </View>
    </>
  );
}

function TextOnPressBox() {
  const [timesPressed, setTimesPressed] = useState(0);

  let textLog = '';
  if (timesPressed > 1) {
    textLog = timesPressed + 'x text onPress';
  } else if (timesPressed > 0) {
    textLog = 'text onPress';
  }

  return (
    <>
      <Text
        style={styles.textBlock}
        testID="tappable_text"
        onPress={() => {
          setTimesPressed(prev => prev + 1);
        }}>
        Text has built-in onPress handling
      </Text>
      <View style={styles.logBox}>
        <Text testID="tappable_text_console">{textLog}</Text>
      </View>
    </>
  );
}

function PressableFeedbackEvents() {
  const [eventLog, setEventLog] = useState([]);

  function appendEvent(eventName) {
    const limit = 6;
    setEventLog(current => {
      return [eventName].concat(current.slice(0, limit - 1));
    });
  }

  return (
    <View testID="pressable_feedback_events">
      <View style={[styles.row, styles.centered]}>
        <Pressable
          style={styles.wrapper}
          testID="pressable_feedback_events_button"
          accessibilityLabel="pressable feedback events"
          accessibilityRole="button"
          onPress={() => appendEvent('press')}
          onPressIn={() => appendEvent('pressIn')}
          onPressOut={() => appendEvent('pressOut')}
          onLongPress={() => appendEvent('longPress')}>
          <Text style={styles.button}>Press Me</Text>
        </Pressable>
      </View>
      <View
        testID="pressable_feedback_events_console"
        style={styles.eventLogBox}>
        {eventLog.map((e, ii) => (
          <Text key={ii}>{e}</Text>
        ))}
      </View>
    </View>
  );
}

function PressableDelayEvents() {
  const [eventLog, setEventLog] = useState([]);

  function appendEvent(eventName) {
    const limit = 6;
    const newEventLog = eventLog.slice(0, limit - 1);
    newEventLog.unshift(eventName);
    setEventLog(newEventLog);
  }

  return (
    <View testID="pressable_delay_events">
      <View style={[styles.row, styles.centered]}>
        <Pressable
          style={styles.wrapper}
          testID="pressable_delay_events_button"
          onPress={() => appendEvent('press')}
          onPressIn={() => appendEvent('pressIn')}
          onPressOut={() => appendEvent('pressOut')}
          delayLongPress={800}
          onLongPress={() => appendEvent('longPress - 800ms delay')}>
          <Text style={styles.button}>Press Me</Text>
        </Pressable>
      </View>
      <View style={styles.eventLogBox} testID="pressable_delay_events_console">
        {eventLog.map((e, ii) => (
          <Text key={ii}>{e}</Text>
        ))}
      </View>
    </View>
  );
}

function ForceTouchExample() {
  const [force, setForce] = useState(0);

  const consoleText = forceTouchAvailable
    ? 'Force: ' + force.toFixed(3)
    : '3D Touch is not available on this device';

  return (
    <View testID="pressable_3dtouch_event">
      <View style={styles.forceTouchBox} testID="pressable_3dtouch_output">
        <Text>{consoleText}</Text>
      </View>
      <View style={[styles.row, styles.centered]}>
        <View
          style={styles.wrapper}
          testID="pressable_3dtouch_button"
          onStartShouldSetResponder={() => true}
          onResponderMove={event => setForce(event.nativeEvent.force)}
          onResponderRelease={event => setForce(0)}>
          <Text style={styles.button}>Press Me</Text>
        </View>
      </View>
    </View>
  );
}

function PressableHitSlop() {
  const [timesPressed, setTimesPressed] = useState(0);

  let log = '';
  if (timesPressed > 1) {
    log = timesPressed + 'x onPress';
  } else if (timesPressed > 0) {
    log = 'onPress';
  }

  return (
    <View testID="pressable_hit_slop">
      <View style={[styles.row, styles.centered]}>
        <Pressable
          onPress={() => setTimesPressed(num => num + 1)}
          style={styles.hitSlopWrapper}
          hitSlop={{top: 30, bottom: 30, left: 60, right: 60}}
          testID="pressable_hit_slop_button">
          <Text style={styles.hitSlopButton}>Press Outside This View</Text>
        </Pressable>
      </View>
      <View style={styles.logBox}>
        <Text>{log}</Text>
      </View>
    </View>
  );
}

function PressableNativeMethods() {
  const [status, setStatus] = useState<?boolean>(null);
  const ref = useRef(null);

  useEffect(() => {
    setStatus(ref.current != null && typeof ref.current.measure === 'function');
  }, []);

  return (
    <>
      <View style={[styles.row, styles.block]}>
        <Pressable ref={ref}>
          <View />
        </Pressable>
        <Text>
          {status == null
            ? 'Missing Ref!'
            : status === true
            ? 'Native Methods Exist'
            : 'Native Methods Missing!'}
        </Text>
      </View>
    </>
  );
}

function PressableDisabled() {
  return (
    <>
      <Pressable disabled={true} style={[styles.row, styles.block]}>
        <Text style={styles.disabledButton}>Disabled Pressable</Text>
      </Pressable>

      <Pressable
        disabled={false}
        style={({pressed}) => [
          {opacity: pressed ? 0.5 : 1},
          styles.row,
          styles.block,
        ]}>
        <Text style={styles.button}>Enabled Pressable</Text>
      </Pressable>
    </>
  );
}

const styles = StyleSheet.create({
  row: {
    justifyContent: 'center',
    flexDirection: 'row',
  },
  centered: {
    justifyContent: 'center',
  },
  text: {
    fontSize: 16,
  },
  block: {
    padding: 10,
  },
  button: {
    color: '#007AFF',
  },
  disabledButton: {
    color: '#007AFF',
    opacity: 0.5,
  },
  hitSlopButton: {
    color: 'white',
  },
  wrapper: {
    borderRadius: 8,
  },
  wrapperCustom: {
    borderRadius: 8,
    padding: 6,
  },
  hitSlopWrapper: {
    backgroundColor: 'red',
    marginVertical: 30,
  },
  logBox: {
    padding: 20,
    margin: 10,
    borderWidth: StyleSheet.hairlineWidth,
    borderColor: '#f0f0f0',
    backgroundColor: '#f9f9f9',
  },
  eventLogBox: {
    padding: 10,
    margin: 10,
    height: 120,
    borderWidth: StyleSheet.hairlineWidth,
    borderColor: '#f0f0f0',
    backgroundColor: '#f9f9f9',
  },
  forceTouchBox: {
    padding: 10,
    margin: 10,
    borderWidth: StyleSheet.hairlineWidth,
    borderColor: '#f0f0f0',
    backgroundColor: '#f9f9f9',
    alignItems: 'center',
  },
  textBlock: {
    fontWeight: '500',
    color: 'blue',
  },
});

exports.displayName = (undefined: ?string);
exports.description = 'Component for making views pressable.';
exports.title = '<Pressable>';
exports.examples = [
  {
    title: 'Change content based on Press',
    render(): React.Node {
      return <ContentPress />;
    },
  },
  {
    title: 'Change style based on Press',
    render(): React.Node {
      return (
        <View style={styles.row}>
          <Pressable
            style={({pressed}) => [
              {
                backgroundColor: pressed ? 'rgb(210, 230, 255)' : 'white',
              },
              styles.wrapperCustom,
            ]}>
            <Text style={styles.text}>Press Me</Text>
          </Pressable>
        </View>
      );
    },
  },
  {
    title: 'Pressable feedback events',
    description: ('<Pressable> components accept onPress, onPressIn, ' +
      'onPressOut, and onLongPress as props.': string),
    render: function(): React.Node {
      return <PressableFeedbackEvents />;
    },
  },
  {
    title: 'Pressable with Ripple and Animated child',
    description: ('Pressable can have an AnimatedComponent as a direct child.': string),
    platform: 'android',
    render: function(): React.Node {
      const mScale = new Animated.Value(1);
      Animated.timing(mScale, {
        toValue: 0.3,
        duration: 1000,
        useNativeDriver: false,
      }).start();
      const style = {
        backgroundColor: 'rgb(180, 64, 119)',
        width: 200,
        height: 100,
        transform: [{scale: mScale}],
      };
      return (
        <View style={styles.row}>
          <Pressable android_rippleColor="green">
            <Animated.View style={style} />
          </Pressable>
        </View>
      );
    },
  },
  {
    title: '<Text onPress={fn}> with highlight',
    render: function(): React.Node {
      return <TextOnPressBox />;
    },
  },
  {
    title: 'Pressable delay for events',
    description: ('<Pressable> also accept delayPressIn, ' +
      'delayPressOut, and delayLongPress as props. These props impact the ' +
      'timing of feedback events.': string),
    render: function(): React.Node {
      return <PressableDelayEvents />;
    },
  },
  {
    title: '3D Touch / Force Touch',
    description:
      'iPhone 8 and 8 plus support 3D touch, which adds a force property to touches',
    render: function(): React.Node {
      return <ForceTouchExample />;
    },
    platform: 'ios',
  },
  {
    title: 'Pressable Hit Slop',
    description: ('<Pressable> components accept hitSlop prop which extends the touch area ' +
      'without changing the view bounds.': string),
    render: function(): React.Node {
      return <PressableHitSlop />;
    },
  },
  {
    title: 'Pressable Native Methods',
    description: ('<Pressable> components expose native methods like `measure`.': string),
    render: function(): React.Node {
      return <PressableNativeMethods />;
    },
  },
  {
    title: 'Disabled Pressable',
    description: ('<Pressable> components accept disabled prop which prevents ' +
      'any interaction with component': string),
    render: function(): React.Node {
      return <PressableDisabled />;
    },
  },
];