1 files changed, 130 insertions, 0 deletions
diff --git a/ui/app/components/send/currency-display.js b/ui/app/components/send/currency-display.js
new file mode 100644
index 000000000..5dba6a8dd
--- /dev/null
+++ b/ui/app/components/send/currency-display.js
@@ -0,0 +1,130 @@
+const Component = require('react').Component
+const h = require('react-hyperscript')
+const inherits = require('util').inherits
+const Identicon = require('../identicon')
+const { conversionUtil, multiplyCurrencies } = require('../../conversion-util')
+
+module.exports = CurrencyDisplay
+
+inherits(CurrencyDisplay, Component)
+function CurrencyDisplay () {
+  Component.call(this)
+
+  this.state = {
+    value: null,
+  }
+}
+
+function isValidInput (text) {
+  const re = /^([1-9]\d*|0)(\.|\.\d*)?$/
+  return re.test(text)
+}
+
+function toHexWei (value) {
+  return conversionUtil(value, {
+    fromNumericBase: 'dec',
+    toNumericBase: 'hex',
+    toDenomination: 'WEI',
+  })
+}
+
+CurrencyDisplay.prototype.getAmount = function (value) {
+  const { selectedToken } = this.props
+  const { decimals } = selectedToken || {}
+  const multiplier = Math.pow(10, Number(decimals || 0))
+
+  const sendAmount = multiplyCurrencies(value, multiplier, {toNumericBase: 'hex'})
+
+  return selectedToken
+    ? sendAmount
+    : toHexWei(value)
+}
+
+CurrencyDisplay.prototype.render = function () {
+  const {
+    className = 'currency-display',
+    primaryBalanceClassName = 'currency-display__input',
+    convertedBalanceClassName = 'currency-display__converted-value',
+    conversionRate,
+    primaryCurrency,
+    convertedCurrency,
+    convertedPrefix = '',
+    placeholder = '0',
+    readOnly = false,
+    inError = false,
+    value: initValue,
+    handleChange,
+    validate,
+  } = this.props
+  const { value } = this.state
+
+  const initValueToRender = conversionUtil(initValue, {
+    fromNumericBase: 'hex',
+    toNumericBase: 'dec',
+    fromDenomination: 'WEI',
+    numberOfDecimals: 6,
+    conversionRate,
+  })
+
+  const convertedValue = conversionUtil(value || initValueToRender, {
+    fromNumericBase: 'dec',
+    fromCurrency: primaryCurrency,
+    toCurrency: convertedCurrency,
+    numberOfDecimals: 2,
+    conversionRate,
+  })
+
+  const inputSizeMultiplier = readOnly ? 1 : 1.2;
+
+  return h('div', {
+    className,
+    style: {
+      borderColor: inError ? 'red' : null,
+    },
+  }, [
+
+    h('div.currency-display__primary-row', [
+
+      h('div.currency-display__input-wrapper', [
+
+        h('input', {
+          className: primaryBalanceClassName,
+          value: `${value || initValueToRender}`,
+          placeholder: '0',
+          size: (value || initValueToRender).length * inputSizeMultiplier,
+          readOnly,
+          onChange: (event) => {
+            let newValue = event.target.value
+
+            if (newValue === '') {
+              newValue = '0'
+            }
+            else if (newValue.match(/^0[1-9]$/)) {
+              newValue = newValue.match(/[1-9]/)[0]
+            }
+
+            if (newValue && !isValidInput(newValue)) {
+              event.preventDefault()
+            }
+            else {
+              validate(this.getAmount(newValue))
+              this.setState({ value: newValue })
+            }
+          },
+          onBlur: event => !readOnly && handleChange(this.getAmount(event.target.value)),
+        }),
+
+        h('span.currency-display__currency-symbol', primaryCurrency),
+
+      ]),
+
+    ]),
+
+    h('div', {
+      className: convertedBalanceClassName,
+    }, `${convertedValue} ${convertedCurrency.toUpperCase()}`),
+
+  ])
+    
+}
+