react-native/packages/rn-tester/js/examples/Accessibility/AccessibilityAndroidExample.android.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';

const React = require('react');
import RNTesterBlock from '../../components/RNTesterBlock';
import RNTesterPage from '../../components/RNTesterPage';
import {StyleSheet, Text, View, TouchableWithoutFeedback} from 'react-native';

const importantForAccessibilityValues = [
  'auto',
  'yes',
  'no',
  'no-hide-descendants',
];

type AccessibilityAndroidExampleState = {
  count: number,
  backgroundImportantForAcc: number,
  forgroundImportantForAcc: number,
};

class AccessibilityAndroidExample extends React.Component<
  {},
  AccessibilityAndroidExampleState,
> {
  state: AccessibilityAndroidExampleState = {
    count: 0,
    backgroundImportantForAcc: 0,
    forgroundImportantForAcc: 0,
  };

  _addOne = () => {
    this.setState({
      count: ++this.state.count,
    });
  };

  _changeBackgroundImportantForAcc = () => {
    this.setState({
      backgroundImportantForAcc: (this.state.backgroundImportantForAcc + 1) % 4,
    });
  };

  _changeForgroundImportantForAcc = () => {
    this.setState({
      forgroundImportantForAcc: (this.state.forgroundImportantForAcc + 1) % 4,
    });
  };

  render(): React.Node {
    return (
      <RNTesterPage title={'Accessibility Android APIs'}>
        <RNTesterBlock title="LiveRegion">
          <TouchableWithoutFeedback onPress={this._addOne}>
            <View style={styles.embedded}>
              <Text>Click me</Text>
            </View>
          </TouchableWithoutFeedback>
          <View accessibilityLiveRegion="polite">
            <Text>Clicked {this.state.count} times</Text>
          </View>
        </RNTesterBlock>

        <RNTesterBlock title="Overlapping views and importantForAccessibility property">
          <View style={styles.container}>
            <TouchableWithoutFeedback
              accessible={true}
              accessibilityLabel="First layout"
              importantForAccessibility={
                importantForAccessibilityValues[
                  this.state.backgroundImportantForAcc
                ]
              }>
              <View accessible={true} style={styles.touchableContainer}>
                <Text style={{fontSize: 25}}>Hello</Text>
              </View>
            </TouchableWithoutFeedback>
            <View
              style={{
                position: 'absolute',
                left: 10,
                top: 25,
                right: 10,
                height: 110,
                backgroundColor: 'yellow',
                opacity: 0.5,
              }}
              accessible={true}
              accessibilityLabel="Second layout"
              importantForAccessibility={
                importantForAccessibilityValues[
                  this.state.forgroundImportantForAcc
                ]
              }>
              <View accessible={true}>
                <Text style={{fontSize: 20}}>world</Text>
              </View>
            </View>
          </View>
          <TouchableWithoutFeedback
            onPress={this._changeBackgroundImportantForAcc}>
            <View style={styles.embedded}>
              <Text>
                Change importantForAccessibility for background layout.
              </Text>
            </View>
          </TouchableWithoutFeedback>
          <View accessible={true}>
            <Text>Background layout importantForAccessibility</Text>
            <Text>
              {
                importantForAccessibilityValues[
                  this.state.backgroundImportantForAcc
                ]
              }
            </Text>
          </View>
          <TouchableWithoutFeedback
            onPress={this._changeForgroundImportantForAcc}>
            <View style={styles.embedded}>
              <Text>
                Change importantForAccessibility for forground layout.
              </Text>
            </View>
          </TouchableWithoutFeedback>
          <View accessible={true}>
            <Text>Forground layout importantForAccessibility</Text>
            <Text>
              {
                importantForAccessibilityValues[
                  this.state.forgroundImportantForAcc
                ]
              }
            </Text>
          </View>
        </RNTesterBlock>
      </RNTesterPage>
    );
  }
}

const styles = StyleSheet.create({
  touchableContainer: {
    position: 'absolute',
    left: 10,
    top: 10,
    right: 10,
    height: 100,
    backgroundColor: 'green',
  },
  embedded: {
    backgroundColor: 'yellow',
    padding: 10,
  },
  container: {
    flex: 1,
    backgroundColor: 'white',
    padding: 10,
    height: 150,
  },
});

exports.title = 'AccessibilityAndroid';
exports.description = 'Android specific Accessibility APIs.';
exports.examples = [
  {
    title: 'Accessibility elements',
    render(): React.Element<typeof AccessibilityAndroidExample> {
      return <AccessibilityAndroidExample />;
    },
  },
];