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import React, { PureComponent } from 'react'
import PropTypes from 'prop-types'
import UnitInput from '../unit-input'
import CurrencyDisplay from '../currency-display'
import { getWeiHexFromDecimalValue } from '../../helpers/conversions.util'
import ethUtil from 'ethereumjs-util'
import { conversionUtil, multiplyCurrencies } from '../../conversion-util'
import { ETH } from '../../constants/common'
/**
* Component that allows user to enter token values as a number, and props receive a converted
* hex value. props.value, used as a default or forced value, should be a hex value, which
* gets converted into a decimal value.
*/
export default class TokenInput extends PureComponent {
static contextTypes = {
t: PropTypes.func,
}
static propTypes = {
currentCurrency: PropTypes.string,
onChange: PropTypes.func,
onBlur: PropTypes.func,
value: PropTypes.string,
suffix: PropTypes.string,
showFiat: PropTypes.bool,
selectedToken: PropTypes.object,
selectedTokenExchangeRate: PropTypes.number,
}
constructor (props) {
super(props)
const { value: hexValue } = props
const decimalValue = hexValue ? this.getDecimalValue(props) : 0
this.state = {
decimalValue,
hexValue,
}
}
componentDidUpdate (prevProps) {
const { value: prevPropsHexValue } = prevProps
const { value: propsHexValue } = this.props
const { hexValue: stateHexValue } = this.state
if (prevPropsHexValue !== propsHexValue && propsHexValue !== stateHexValue) {
const decimalValue = this.getDecimalValue(this.props)
this.setState({ hexValue: propsHexValue, decimalValue })
}
}
getDecimalValue (props) {
const { value: hexValue, selectedToken: { decimals, symbol } = {} } = props
const multiplier = Math.pow(10, Number(decimals || 0))
const decimalValueString = conversionUtil(ethUtil.addHexPrefix(hexValue), {
fromNumericBase: 'hex',
toNumericBase: 'dec',
toCurrency: symbol,
conversionRate: multiplier,
invertConversionRate: true,
})
return Number(decimalValueString) || 0
}
handleChange = decimalValue => {
const { selectedToken: { decimals } = {}, onChange } = this.props
const multiplier = Math.pow(10, Number(decimals || 0))
const hexValue = multiplyCurrencies(decimalValue || 0, multiplier, { toNumericBase: 'hex' })
this.setState({ hexValue, decimalValue })
onChange(hexValue)
}
handleBlur = () => {
this.props.onBlur(this.state.hexValue)
}
renderConversionComponent () {
const { selectedTokenExchangeRate, showFiat, currentCurrency } = this.props
const { decimalValue } = this.state
let currency, numberOfDecimals
if (showFiat) {
// Display Fiat
currency = currentCurrency
numberOfDecimals = 2
} else {
// Display ETH
currency = ETH
numberOfDecimals = 6
}
const decimalEthValue = (decimalValue * selectedTokenExchangeRate) || 0
const hexWeiValue = getWeiHexFromDecimalValue({
value: decimalEthValue,
fromCurrency: ETH,
fromDenomination: ETH,
})
return selectedTokenExchangeRate
? (
<CurrencyDisplay
className="currency-input__conversion-component"
currency={currency}
value={hexWeiValue}
numberOfDecimals={numberOfDecimals}
/>
) : (
<div className="currency-input__conversion-component">
{ this.context.t('noConversionRateAvailable') }
</div>
)
}
render () {
const { suffix, ...restProps } = this.props
const { decimalValue } = this.state
return (
<UnitInput
{...restProps}
suffix={suffix}
onChange={this.handleChange}
onBlur={this.handleBlur}
value={decimalValue}
>
{ this.renderConversionComponent() }
</UnitInput>
)
}
}
|
