refactor: SelectionListRadio

src/components/SelectionListRadio/BaseSelectionListRadio.js

@@ -0,0 +1,268 @@
+import React, {useEffect, useRef, useState} from 'react';
+import {View} from 'react-native';
+import _ from 'underscore';
+import lodashGet from 'lodash/get';
+import SectionList from '../SectionList';
+import Text from '../Text';
+import styles from '../../styles/styles';
+import TextInput from '../TextInput';
+import ArrowKeyFocusManager from '../ArrowKeyFocusManager';
+import CONST from '../../CONST';
+import variables from '../../styles/variables';
+import {propTypes as selectionListRadioPropTypes, defaultProps as selectionListRadioDefaultProps} from './selectionListRadioPropTypes';
+import RadioListItem from './RadioListItem';
+import useKeyboardShortcut from '../../hooks/useKeyboardShortcut';
+import SafeAreaConsumer from '../SafeAreaConsumer';
+import withKeyboardState, {keyboardStatePropTypes} from '../withKeyboardState';
+
+const propTypes = {
+    ...keyboardStatePropTypes,
+    ...selectionListRadioPropTypes,
+};
+
+function BaseSelectionListRadio(props) {
+    const listRef = useRef(null);
+    const textInputRef = useRef(null);
+    const focusTimeoutRef = useRef(null);
+    const shouldShowTextInput = Boolean(props.textInputLabel);
+
+    /**
+     * Iterates through the sections and items inside each section, and builds 3 arrays along the way:
+     * - `allOptions`: Contains all the items in the list, flattened, regardless of section
+     * - `disabledOptionsIndexes`: Contains the indexes of all the disabled items in the list, to be used by the ArrowKeyFocusManager
+     * - `itemLayouts`: Contains the layout information for each item, header and footer in the list,
+     * so we can calculate the position of any given item when scrolling programmatically
+     *
+     * @return {{itemLayouts: [{offset: number, length: number}], disabledOptionsIndexes: *[], allOptions: *[]}}
+     */
+    const getFlattenedSections = () => {
+        const allOptions = [];
+
+        const disabledOptionsIndexes = [];
+        let disabledIndex = 0;
+
+        let offset = 0;
+        const itemLayouts = [{length: 0, offset}];
+
+        _.each(props.sections, (section, sectionIndex) => {
+            // We're not rendering any section header, but we need to push to the array
+            // because React Native accounts for it in getItemLayout
+            const sectionHeaderHeight = 0;
+            itemLayouts.push({length: sectionHeaderHeight, offset});
+            offset += sectionHeaderHeight;
+
+            _.each(section.data, (option, optionIndex) => {
+                // Add item to the general flattened array
+                allOptions.push({
+                    ...option,
+                    sectionIndex,
+                    index: optionIndex,
+                });
+
+                // If disabled, add to the disabled indexes array
+                if (section.isDisabled || option.isDisabled) {
+                    disabledOptionsIndexes.push(disabledIndex);
+                }
+                disabledIndex += 1;
+
+                // Account for the height of the item in getItemLayout
+                const fullItemHeight = variables.optionRowHeight;
+                itemLayouts.push({length: fullItemHeight, offset});
+                offset += fullItemHeight;
+            });
+
+            // We're not rendering any section footer, but we need to push to the array
+            // because React Native accounts for it in getItemLayout
+            itemLayouts.push({length: 0, offset});
+        });
+
+        // We're not rendering the list footer, but we need to push to the array
+        // because React Native accounts for it in getItemLayout
+        itemLayouts.push({length: 0, offset});
+
+        return {
+            allOptions,
+            disabledOptionsIndexes,
+            itemLayouts,
+        };
+    };
+
+    const flattenedSections = getFlattenedSections();
+
+    const [focusedIndex, setFocusedIndex] = useState(() => {
+        const defaultIndex = 0;
+
+        const indexOfInitiallyFocusedOption = _.findIndex(flattenedSections.allOptions, (option) => option.keyForList === props.initiallyFocusedOptionKey);
+
+        if (indexOfInitiallyFocusedOption >= 0) {
+            return indexOfInitiallyFocusedOption;
+        }
+
+        return defaultIndex;
+    });
+
+    /**
+     * Scrolls to the desired item index in the section list
+     *
+     * @param {Number} index - the index of the item to scroll to
+     * @param {Boolean} animated - whether to animate the scroll
+     */
+    const scrollToIndex = (index, animated) => {
+        const item = flattenedSections.allOptions[index];
+
+        if (!listRef.current || !item) {
+            return;
+        }
+
+        const itemIndex = item.index;
+        const sectionIndex = item.sectionIndex;
+
+        // Note: react-native's SectionList automatically strips out any empty sections.
+        // So we need to reduce the sectionIndex to remove any empty sections in front of the one we're trying to scroll to.
+        // Otherwise, it will cause an index-out-of-bounds error and crash the app.
+        let adjustedSectionIndex = sectionIndex;
+        for (let i = 0; i < sectionIndex; i++) {
+            if (_.isEmpty(lodashGet(props.sections, `[${i}].data`))) {
+                adjustedSectionIndex--;
+            }
+        }
+
+        listRef.current.scrollToLocation({sectionIndex: adjustedSectionIndex, itemIndex, animated});
+    };
+
+    /**
+     * This function is used to compute the layout of any given item in our list.
+     * We need to implement it so that we can programmatically scroll to items outside the virtual render window of the SectionList.
+     *
+     * @param {Array} data - This is the same as the data we pass into the component
+     * @param {Number} flatDataArrayIndex - This index is provided by React Native, and refers to a flat array with data from all the sections. This flat array has some quirks:
+     *
+     *     1. It ALWAYS includes a list header and a list footer, even if we don't provide/render those.
+     *     2. Each section includes a header, even if we don't provide/render one.
+     *
+     *     For example, given a list with two sections, two items in each section, no header, no footer, and no section headers, the flat array might look something like this:
+     *
+     *     [{header}, {sectionHeader}, {item}, {item}, {sectionHeader}, {item}, {item}, {footer}]
+     *
+     * @returns {Object}
+     */
+    const getItemLayout = (data, flatDataArrayIndex) => {
+        const targetItem = flattenedSections.itemLayouts[flatDataArrayIndex];
+
+        return {
+            length: targetItem.length,
+            offset: targetItem.offset,
+            index: flatDataArrayIndex,
+        };
+    };
+
+    const renderItem = ({item, index, section}) => {
+        const isFocused = focusedIndex === index + lodashGet(section, 'indexOffset', 0);
+
+        return (
+            <RadioListItem
+                item={item}
+                isFocused={isFocused}
+                onSelectRow={props.onSelectRow}
+            />
+        );
+    };
+
+    /** Focuses the text input when the component mounts. If `props.shouldDelayFocus` is true, we wait for the animation to finish */
+    useEffect(() => {
+        if (shouldShowTextInput) {
+            if (props.shouldDelayFocus) {
+                focusTimeoutRef.current = setTimeout(() => textInputRef.current.focus(), CONST.ANIMATED_TRANSITION);
+            } else {
+                textInputRef.current.focus();
+            }
+        }
+
+        return () => {
+            if (!focusTimeoutRef.current) {
+                return;
+            }
+            clearTimeout(focusTimeoutRef.current);
+        };
+    }, [props.shouldDelayFocus, shouldShowTextInput]);
+
+    useKeyboardShortcut(
+        CONST.KEYBOARD_SHORTCUTS.ENTER,
+        () => {
+            const focusedOption = flattenedSections.allOptions[focusedIndex];
+
+            if (!focusedOption) {
+                return;
+            }
+
+            props.onSelectRow(focusedOption);
+        },
+        {
+            captureOnInputs: true,
+            shouldBubble: () => !flattenedSections.allOptions[focusedIndex],
+        },
+    );
+
+    return (
+        <ArrowKeyFocusManager
+            disabledIndexes={flattenedSections.disabledOptionsIndexes}
+            focusedIndex={focusedIndex}
+            maxIndex={flattenedSections.allOptions.length - 1}
+            onFocusedIndexChanged={(newFocusedIndex) => {
+                setFocusedIndex(newFocusedIndex);
+                scrollToIndex(newFocusedIndex, true);
+            }}
+        >
+            <SafeAreaConsumer>
+                {({safeAreaPaddingBottomStyle}) => (
+                    <View style={[styles.flex1, !props.isKeyboardShown && safeAreaPaddingBottomStyle]}>
+                        {shouldShowTextInput && (
+                            <View style={[styles.ph5, styles.pv5]}>
+                                <TextInput
+                                    ref={textInputRef}
+                                    label={props.textInputLabel}
+                                    value={props.textInputValue}
+                                    placeholder={props.textInputPlaceholder}
+                                    maxLength={props.textInputMaxLength}
+                                    onChangeText={props.onChangeText}
+                                    keyboardType={props.keyboardType}
+                                    selectTextOnFocus
+                                />
+                            </View>
+                        )}
+                        {Boolean(props.headerMessage) && (
+                            <View style={[styles.ph5, styles.pb5]}>
+                                <Text style={[styles.textLabel, styles.colorMuted]}>{props.headerMessage}</Text>
+                            </View>
+                        )}
+                        <SectionList
+                            ref={listRef}
+                            sections={props.sections}
+                            renderItem={renderItem}
+                            getItemLayout={getItemLayout}
+                            onScroll={props.onScroll}
+                            onScrollBeginDrag={props.onScrollBeginDrag}
+                            keyExtractor={(item) => item.keyForList}
+                            extraData={focusedIndex}
+                            indicatorStyle="white"
+                            keyboardShouldPersistTaps="always"
+                            showsVerticalScrollIndicator={false}
+                            OP
+                            initialNumToRender={12}
+                            maxToRenderPerBatch={5}
+                            windowSize={5}
+                            viewabilityConfig={{viewAreaCoveragePercentThreshold: 95}}
+                            onLayout={() => scrollToIndex(focusedIndex, false)}
+                        />
+                    </View>
+                )}
+            </SafeAreaConsumer>
+        </ArrowKeyFocusManager>
+    );
+}
+
+BaseSelectionListRadio.displayName = 'BaseSelectionListRadio';
+BaseSelectionListRadio.propTypes = propTypes;
+BaseSelectionListRadio.defaultProps = selectionListRadioDefaultProps;
+
+export default withKeyboardState(BaseSelectionListRadio);

src/components/SelectionListRadio/RadioListItem.js

@@ -0,0 +1,74 @@
+import React from 'react';
+import {View} from 'react-native';
+import PropTypes from 'prop-types';
+import PressableWithFeedback from '../Pressable/PressableWithFeedback';
+import styles from '../../styles/styles';
+import Text from '../Text';
+import Icon from '../Icon';
+import * as Expensicons from '../Icon/Expensicons';
+import themeColors from '../../styles/themes/default';
+import {radioListItemPropTypes} from './selectionListRadioPropTypes';
+
+const propTypes = {
+    /** The section list item */
+    item: PropTypes.shape(radioListItemPropTypes),
+
+    /** Whether this item is focused (for arrow key controls) */
+    isFocused: PropTypes.bool,
+
+    /** Callback to fire when the item is pressed */
+    onSelectRow: PropTypes.func,
+};
+
+const defaultProps = {
+    item: {},
+    isFocused: false,
+    onSelectRow: () => {},
+};
+
+function RadioListItem(props) {
+    return (
+        <PressableWithFeedback
+            onPress={() => props.onSelectRow(props.item)}
+            accessibilityLabel={props.item.text}
+            accessibilityRole="button"
+            hoverDimmingValue={1}
+            hoverStyle={styles.hoveredComponentBG}
+            focusStyle={styles.hoveredComponentBG}
+        >
+            <View style={[styles.flex1, styles.justifyContentBetween, styles.sidebarLinkInner, styles.optionRow, props.isFocused && styles.sidebarLinkActive]}>
+                <View style={[styles.flex1, styles.alignItemsStart]}>
+                    <Text style={[styles.optionDisplayName, props.isFocused ? styles.sidebarLinkActiveText : styles.sidebarLinkText, props.item.isSelected && styles.sidebarLinkTextBold]}>
+                        {props.item.text}
+                    </Text>
+
+                    {Boolean(props.item.alternateText) && (
+                        <Text style={[props.isFocused ? styles.sidebarLinkActiveText : styles.sidebarLinkText, styles.optionAlternateText, styles.textLabelSupporting]}>
+                            {props.item.alternateText}
+                        </Text>
+                    )}
+                </View>
+
+                {props.item.isSelected && (
+                    <View
+                        style={[styles.flexRow, styles.alignItemsCenter]}
+                        accessible={false}
+                    >
+                        <View>
+                            <Icon
+                                src={Expensicons.Checkmark}
+                                fill={themeColors.success}
+                            />
+                        </View>
+                    </View>
+                )}
+            </View>
+        </PressableWithFeedback>
+    );
+}
+
+RadioListItem.displayName = 'RadioListItem';
+RadioListItem.propTypes = propTypes;
+RadioListItem.defaultProps = defaultProps;
+
+export default RadioListItem;

src/components/SelectionListRadio/index.android.js

@@ -0,0 +1,17 @@
+import React, {forwardRef} from 'react';
+import {Keyboard} from 'react-native';
+import BaseSelectionListRadio from './BaseSelectionListRadio';
+
+const SelectionListRadio = forwardRef((props, ref) => (
+    <BaseSelectionListRadio
+        // eslint-disable-next-line react/jsx-props-no-spreading
+        {...props}
+        ref={ref}
+        shouldDelayFocus
+        onScrollBeginDrag={() => Keyboard.dismiss()}
+    />
+));
+
+SelectionListRadio.displayName = 'SelectionListRadio';
+
+export default SelectionListRadio;

src/components/SelectionListRadio/index.ios.js

@@ -0,0 +1,16 @@
+import React, {forwardRef} from 'react';
+import {Keyboard} from 'react-native';
+import BaseSelectionListRadio from './BaseSelectionListRadio';
+
+const SelectionListRadio = forwardRef((props, ref) => (
+    <BaseSelectionListRadio
+        // eslint-disable-next-line react/jsx-props-no-spreading
+        {...props}
+        ref={ref}
+        onScrollBeginDrag={() => Keyboard.dismiss()}
+    />
+));
+
+SelectionListRadio.displayName = 'SelectionListRadio';
+
+export default SelectionListRadio;