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items_choice_ChoiceRenderer.js.html
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<!DOCTYPE html>
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<title>JSDoc: Source: items/choice/ChoiceRenderer.js</title>
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<h1 class="page-title">Source: items/choice/ChoiceRenderer.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>import React, { useState, useEffect } from 'react'
import { View } from 'react-native'
import { createStyleSheet } from '../../styles/createStyleSheet'
import { Choice } from './Choice'
import { Checkbox } from '../../components/Checkbox'
import { Colors } from '../../constants/Colors'
import { Log } from '../../infrastructure/Log'
import { getChoiceEntryScoreColor } from './getChoiceEntryScoreColor'
import { getCompareValuesForSelectableItems } from '../shared/getCompareValuesForSelectableItems'
const debug = Log.create('ChoiceRenderer', 'debug', true)
/**
* Renders a SingleChoice or MultipleChoice item
* @param props
* @return {JSX.Element}
* @component
*/
export const ChoiceRenderer = props => {
const [selected, setSelected] = useState({})
const [compared, setCompared] = useState({})
const { contentId, showCorrectResponse, scoreResult, value } = props
// compare responses with the correct responses when
// the parent decided to activate {showCorrectResponse}
useEffect(() => {
if (!showCorrectResponse || !scoreResult) {
return
}
const correctResponses = value.scoring.flatMap(sc => sc.correctResponse)
const result = getCompareValuesForSelectableItems({ correctResponses, selected })
setCompared(result)
}, [showCorrectResponse, scoreResult, value, selected])
// When contentId changes we have a new element to be rendered:
// 1. clear all selections when the content id changes
// which happens, for example, if we move to the next page
// 2. clear all compared
// 3. submit a fresh 'empty' response
useEffect(() => {
debug('new contentId', contentId)
setSelected({})
setCompared({})
props.submitResponse({
responses: getResponses({}),
data: props
})
}, [contentId])
const { dimensionColor } = props
const { flavor, choices } = props.value
const selectChoice = index => {
const update = getUpdate({ index, flavor, selected })
setSelected(update)
return props.submitResponse({
responses: getResponses(update),
data: props
})
}
const toChoiceButton = (choice, index) => {
const isSelected = !!(selected[index])
const key = `choice-${index}`
const onPress = () => selectChoice(index)
return (
<Checkbox
key={key}
ttsText={choice.tts}
text={choice.text}
hideTts={!choice.tts}
image={choice.image}
onPress={onPress}
checked={isSelected}
checkedColor={Colors.secondary}
uncheckedColor={Colors.gray}
iconColor={dimensionColor}
checkedIcon='dot-circle-o'
uncheckedIcon='circle-o'
textStyle={styles.checkboxText}
textAlign='center'
/>
)
}
const toDisabledChoiceButton = (choice, index) => {
const compareState = compared[index]
const isSelected = !!(selected[index])
const isCompared = typeof compareState === 'number'
const scoredColor = getChoiceEntryScoreColor({
isSelected, isCompared, compareState
})
const key = `choice-${index}`
return (
<Checkbox
key={key}
ttsText={choice.tts}
text={choice.text}
image={choice.image}
hideTts={!choice.tts}
onPress={() => {}}
checked={isSelected || isCompared}
checkedColor={scoredColor ?? Colors.secondary}
uncheckedColor={Colors.gray}
iconColor={scoredColor ?? dimensionColor}
checkedIcon='dot-circle-o'
uncheckedIcon='circle-o'
textStyle={styles.checkboxText}
textAlign='center'
/>
)
}
return (
<View style={[styles.container, props.style]}>
{choices.map(props.showCorrectResponse ? toDisabledChoiceButton : toChoiceButton)}
</View>
)
}
const styles = createStyleSheet({
container: {
flex: 1,
flexDirection: 'column',
alignItems: 'center',
justifyContent: 'center'
},
selected: {
borderWidth: 1,
borderColor: Colors.secondary
},
checkboxText: {
color: Colors.secondary,
fontWeight: 'bold'
}
})
const getUpdate = ({ index, flavor, selected }) => {
// single choice: just replace index
if (flavor === Choice.flavors.single.value) {
return { [index]: true }
}
if (flavor === Choice.flavors.multiple.value) {
// multiple choice: add/remove index
const update = { ...selected }
update[index] = !update[index]
return update
}
throw new Error(`Unexpected flavor ${flavor}`)
}
const getResponses = (selection) => {
const responses = []
Object.keys(selection).forEach(index => {
if (selection[index]) {
responses.push(index)
}
})
if (responses.length === 0) {
responses.push('__undefined__')
}
return responses
}
</code></pre>
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