metamask-extension/ui/app/pages/send/send-content/send-asset-row/send-asset-row.component.js

import React, { Component } from 'react'
import PropTypes from 'prop-types'
import SendRowWrapper from '../send-row-wrapper'
import Identicon from '../../../../components/ui/identicon/identicon.component'
import TokenBalance from '../../../../components/ui/token-balance'
import UserPreferencedCurrencyDisplay from '../../../../components/app/user-preferenced-currency-display'
import { PRIMARY } from '../../../../helpers/constants/common'

export default class SendAssetRow extends Component {
  static propTypes = {
    tokens: PropTypes.arrayOf(
      PropTypes.shape({
        address: PropTypes.string,
        decimals: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
        symbol: PropTypes.string,
      }),
    ).isRequired,
    accounts: PropTypes.object.isRequired,
    selectedAddress: PropTypes.string.isRequired,
    sendTokenAddress: PropTypes.string,
    setSendToken: PropTypes.func.isRequired,
  }

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

  state = {
    isShowingDropdown: false,
  }

  openDropdown = () => this.setState({ isShowingDropdown: true })

  closeDropdown = () => this.setState({ isShowingDropdown: false })

  selectToken = (token) => {
    this.setState(
      {
        isShowingDropdown: false,
      },
      () => {
        this.context.metricsEvent({
          eventOpts: {
            category: 'Transactions',
            action: 'Send Screen',
            name: 'User clicks "Assets" dropdown',
          },
          customVariables: {
            assetSelected: token ? 'ERC20' : 'ETH',
          },
        })
        this.props.setSendToken(token)
      },
    )
  }

  render() {
    const { t } = this.context

    return (
      <SendRowWrapper label={`${t('asset')}:`}>
        <div className="send-v2__asset-dropdown">
          {this.renderSendToken()}
          {this.props.tokens.length > 0 ? this.renderAssetDropdown() : null}
        </div>
      </SendRowWrapper>
    )
  }

  renderSendToken() {
    const { sendTokenAddress } = this.props
    const token = this.props.tokens.find(
      ({ address }) => address === sendTokenAddress,
    )
    return (
      <div
        className="send-v2__asset-dropdown__input-wrapper"
        onClick={this.openDropdown}
      >
        {token ? this.renderAsset(token) : this.renderEth()}
      </div>
    )
  }

  renderAssetDropdown() {
    return (
      this.state.isShowingDropdown && (
        <div>
          <div
            className="send-v2__asset-dropdown__close-area"
            onClick={this.closeDropdown}
          />
          <div className="send-v2__asset-dropdown__list">
            {this.renderEth(true)}
            {this.props.tokens.map((token) => this.renderAsset(token, true))}
          </div>
        </div>
      )
    )
  }

  renderEth(insideDropdown = false) {
    const { t } = this.context
    const { accounts, selectedAddress } = this.props

    const balanceValue = accounts[selectedAddress]
      ? accounts[selectedAddress].balance
      : ''

    return (
      <div
        className={
          this.props.tokens.length > 0
            ? 'send-v2__asset-dropdown__asset'
            : 'send-v2__asset-dropdown__single-asset'
        }
        onClick={() => this.selectToken()}
      >
        <div className="send-v2__asset-dropdown__asset-icon">
          <Identicon diameter={36} />
        </div>
        <div className="send-v2__asset-dropdown__asset-data">
          <div className="send-v2__asset-dropdown__symbol">ETH</div>
          <div className="send-v2__asset-dropdown__name">
            <span className="send-v2__asset-dropdown__name__label">
              {`${t('balance')}:`}
            </span>
            <UserPreferencedCurrencyDisplay
              value={balanceValue}
              type={PRIMARY}
            />
          </div>
        </div>
        {!insideDropdown && this.props.tokens.length > 0 && (
          <i className="fa fa-caret-down fa-lg simple-dropdown__caret" />
        )}
      </div>
    )
  }

  renderAsset(token, insideDropdown = false) {
    const { address, symbol } = token
    const { t } = this.context

    return (
      <div
        key={address}
        className="send-v2__asset-dropdown__asset"
        onClick={() => this.selectToken(token)}
      >
        <div className="send-v2__asset-dropdown__asset-icon">
          <Identicon address={address} diameter={36} />
        </div>
        <div className="send-v2__asset-dropdown__asset-data">
          <div className="send-v2__asset-dropdown__symbol">{symbol}</div>
          <div className="send-v2__asset-dropdown__name">
            <span className="send-v2__asset-dropdown__name__label">
              {`${t('balance')}:`}
            </span>
            <TokenBalance token={token} />
          </div>
        </div>
        {!insideDropdown && (
          <i className="fa fa-caret-down fa-lg simple-dropdown__caret" />
        )}
      </div>
    )
  }
}