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126 lines
3.2 KiB
126 lines
3.2 KiB
const Component = require('react').Component
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const h = require('react-hyperscript')
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const inherits = require('util').inherits
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const Identicon = require('../identicon')
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const { conversionUtil } = require('../../conversion-util')
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module.exports = CurrencyDisplay
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inherits(CurrencyDisplay, Component)
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function CurrencyDisplay () {
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Component.call(this)
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this.state = {
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value: null,
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}
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}
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function isValidInput (text) {
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const re = /^([1-9]\d*|0)(\.|\.\d*)?$/
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return re.test(text)
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}
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function resetCaretIfPastEnd (value, event) {
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const caretPosition = event.target.selectionStart
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if (caretPosition > value.length) {
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event.target.setSelectionRange(value.length, value.length)
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}
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}
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function toHexWei (value) {
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return conversionUtil(value, {
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fromNumericBase: 'dec',
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toNumericBase: 'hex',
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toDenomination: 'WEI',
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})
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}
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CurrencyDisplay.prototype.render = function () {
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const {
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className = 'currency-display',
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primaryBalanceClassName = 'currency-display__input',
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convertedBalanceClassName = 'currency-display__converted-value',
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conversionRate,
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primaryCurrency,
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convertedCurrency,
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convertedPrefix = '',
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placeholder = '0',
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readOnly = false,
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inError = false,
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value: initValue,
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handleChange,
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validate,
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} = this.props
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const { value } = this.state
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const initValueToRender = conversionUtil(initValue, {
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fromNumericBase: 'hex',
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toNumericBase: 'dec',
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fromDenomination: 'WEI',
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numberOfDecimals: 6,
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conversionRate,
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})
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const convertedValue = conversionUtil(value || initValueToRender, {
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fromNumericBase: 'dec',
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fromCurrency: primaryCurrency,
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toCurrency: convertedCurrency,
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numberOfDecimals: 2,
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conversionRate,
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})
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return h('div', {
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className,
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style: {
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borderColor: inError ? 'red' : null,
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},
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}, [
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h('div.currency-display__primary-row', [
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h('div.currency-display__input-wrapper', [
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h('input', {
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className: primaryBalanceClassName,
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value: `${value || initValueToRender} ${primaryCurrency}`,
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placeholder: `${0} ${primaryCurrency}`,
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readOnly,
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onChange: (event) => {
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let newValue = event.target.value.split(' ')[0]
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if (newValue === '') {
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this.setState({ value: '0' })
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}
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else if (newValue.match(/^0[1-9]$/)) {
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this.setState({ value: newValue.match(/[1-9]/)[0] })
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}
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else if (newValue && !isValidInput(newValue)) {
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event.preventDefault()
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}
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else {
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this.setState({ value: newValue })
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}
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},
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onBlur: event => !readOnly && handleChange(toHexWei(event.target.value.split(' ')[0])),
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onKeyUp: event => {
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if (!readOnly) {
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validate(toHexWei(value || initValueToRender))
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resetCaretIfPastEnd(value || initValueToRender, event)
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}
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},
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onClick: event => !readOnly && resetCaretIfPastEnd(value || initValueToRender, event),
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}),
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]),
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]),
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h('div', {
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className: convertedBalanceClassName,
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}, `${convertedValue} ${convertedCurrency.toUpperCase()}`),
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])
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}
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