metamask-extension/ui/app/components/send/send-content/send-amount-row/send-amount-row.component.js

import React, { Component } from 'react'
import PropTypes from 'prop-types'
import SendRowWrapper from '../send-row-wrapper/'
import AmountMaxButton from './amount-max-button/'
import CurrencyDisplay from '../../currency-display'

export default class SendAmountRow extends Component {

  static propTypes = {
    amount: PropTypes.string,
    amountConversionRate: PropTypes.oneOfType([
      PropTypes.string,
      PropTypes.number,
    ]),
    balance: PropTypes.string,
    conversionRate: PropTypes.number,
    convertedCurrency: PropTypes.string,
    gasTotal: PropTypes.string,
    inError: PropTypes.bool,
    primaryCurrency: PropTypes.string,
    selectedToken: PropTypes.object,
    setMaxModeTo: PropTypes.func,
    tokenBalance: PropTypes.string,
    updateGasFeeError: PropTypes.func,
    updateSendAmount: PropTypes.func,
    updateSendAmountError: PropTypes.func,
    updateGas: PropTypes.func,
  };

  static contextTypes = {
    t: PropTypes.func,
  };

  validateAmount (amount) {
    const {
      amountConversionRate,
      balance,
      conversionRate,
      gasTotal,
      primaryCurrency,
      selectedToken,
      tokenBalance,
      updateGasFeeError,
      updateSendAmountError,
    } = this.props

    updateSendAmountError({
      amount,
      amountConversionRate,
      balance,
      conversionRate,
      gasTotal,
      primaryCurrency,
      selectedToken,
      tokenBalance,
    })

    if (selectedToken) {
      updateGasFeeError({
        amount,
        amountConversionRate,
        balance,
        conversionRate,
        gasTotal,
        primaryCurrency,
        selectedToken,
        tokenBalance,
      })
    }
  }

  updateAmount (amount) {
    const { updateSendAmount, setMaxModeTo } = this.props

    setMaxModeTo(false)
    updateSendAmount(amount)
  }

  updateGas (amount) {
    const { selectedToken, updateGas } = this.props

    if (selectedToken) {
      updateGas({ amount })
    }
  }

  render () {
    const {
      amount,
      amountConversionRate,
      convertedCurrency,
      gasTotal,
      inError,
      primaryCurrency,
      selectedToken,
    } = this.props

    return (
      <SendRowWrapper
        label={`${this.context.t('amount')}:`}
        showError={inError}
        errorType={'amount'}
      >
        {!inError && gasTotal && <AmountMaxButton />}
        <CurrencyDisplay
          conversionRate={amountConversionRate}
          convertedCurrency={convertedCurrency}
          onBlur={newAmount => {
            this.updateGas(newAmount)
            this.updateAmount(newAmount)
          }}
          onChange={newAmount => this.validateAmount(newAmount)}
          inError={inError}
          primaryCurrency={primaryCurrency || 'ETH'}
          selectedToken={selectedToken}
          value={amount}
          step="any"
        />
      </SendRowWrapper>
    )
  }

}