Update max amount behaviour to meet new specs.

ui/app/actions.js

@@ -149,6 +149,7 @@ var actions = {
   UPDATE_SEND_AMOUNT: 'UPDATE_SEND_AMOUNT',
   UPDATE_SEND_MEMO: 'UPDATE_SEND_MEMO',
   UPDATE_SEND_ERRORS: 'UPDATE_SEND_ERRORS',
+  UPDATE_MAX_MODE: 'UPDATE_MAX_MODE',
   UPDATE_SEND: 'UPDATE_SEND',
   CLEAR_SEND: 'CLEAR_SEND',
   updateGasLimit,
@@ -160,6 +161,7 @@ var actions = {
   updateSendAmount,
   updateSendMemo,
   updateSendErrors,
+  setMaxModeTo,
   updateSend,
   clearSend,
   setSelectedAddress,
@@ -637,6 +639,13 @@ function updateSendErrors (error) {
   }
 }
 
+function setMaxModeTo (bool) {
+  return {
+    type: actions.UPDATE_MAX_MODE,
+    value: bool,
+  }
+}
+
 function updateSend (newSend) {
   return {
     type: actions.UPDATE_SEND,

ui/app/components/customize-gas-modal/index.js

@@ -5,6 +5,8 @@ const connect = require('react-redux').connect
 const actions = require('../../actions')
 const GasModalCard = require('./gas-modal-card')
 
+const ethUtil = require('ethereumjs-util')
+
 const {
   MIN_GAS_PRICE_DEC,
   MIN_GAS_LIMIT_DEC,
@@ -19,6 +21,7 @@ const {
   conversionUtil,
   multiplyCurrencies,
   conversionGreaterThan,
+  subtractCurrencies,
 } = require('../../conversion-util')
 
 const {
@@ -30,6 +33,7 @@ const {
   getSendFrom,
   getCurrentAccountWithSendEtherInfo,
   getSelectedTokenToFiatRate,
+  getSendMaxModeState,
 } = require('../../selectors')
 
 function mapStateToProps (state) {
@@ -42,6 +46,7 @@ function mapStateToProps (state) {
     gasLimit: getGasLimit(state),
     conversionRate,
     amount: getSendAmount(state),
+    maxModeOn: getSendMaxModeState(state),
     balance: currentAccount.balance,
     primaryCurrency: selectedToken && selectedToken.symbol,
     selectedToken,
@@ -55,6 +60,7 @@ function mapDispatchToProps (dispatch) {
     updateGasPrice: newGasPrice => dispatch(actions.updateGasPrice(newGasPrice)),
     updateGasLimit: newGasLimit => dispatch(actions.updateGasLimit(newGasLimit)),
     updateGasTotal: newGasTotal => dispatch(actions.updateGasTotal(newGasTotal)),
+    updateSendAmount: newAmount => dispatch(actions.updateSendAmount(newAmount)),
   }
 }
 
@@ -93,8 +99,21 @@ CustomizeGasModal.prototype.save = function (gasPrice, gasLimit, gasTotal) {
     updateGasLimit,
     hideModal,
     updateGasTotal,
+    maxModeOn,
+    selectedToken,
+    balance,
+    updateSendAmount,
   } = this.props
 
+  if (maxModeOn && !selectedToken) {
+    const maxAmount = subtractCurrencies(
+      ethUtil.addHexPrefix(balance),
+      ethUtil.addHexPrefix(gasTotal),
+      { toNumericBase: 'hex' }
+    )
+    updateSendAmount(maxAmount)
+  }
+
   updateGasPrice(gasPrice)
   updateGasLimit(gasLimit)
   updateGasTotal(gasTotal)
@@ -112,12 +131,13 @@ CustomizeGasModal.prototype.validate = function ({ gasTotal, gasLimit }) {
     selectedToken,
     amountConversionRate,
     conversionRate,
+    maxModeOn,
   } = this.props
 
   let error = null
 
   const balanceIsSufficient = isBalanceSufficient({
-    amount: selectedToken ? '0' : amount,
+    amount: selectedToken || maxModeOn ? '0' : amount,
     gasTotal,
     balance,
     selectedToken,

ui/app/components/send/send-v2-container.js

@@ -78,5 +78,6 @@ function mapDispatchToProps (dispatch) {
     goHome: () => dispatch(actions.goHome()),
     clearSend: () => dispatch(actions.clearSend()),
     backToConfirmScreen: editingTransactionId => dispatch(actions.showConfTxPage({ id: editingTransactionId })),
+    setMaxModeTo: bool => dispatch(actions.setMaxModeTo(bool)),
   }
 }

ui/app/reducers/metamask.js

@@ -33,6 +33,7 @@ function reduceMetamask (state, action) {
       amount: '0x0',
       memo: '',
       errors: {},
+      maxModeOn: false,
       editingTransactionId: null,
     },
     coinOptions: {},
@@ -258,6 +259,14 @@ function reduceMetamask (state, action) {
         },
       })
 
+    case actions.UPDATE_MAX_MODE:
+      return extend(metamaskState, {
+        send: {
+          ...metamaskState.send,
+          maxModeOn: action.value,
+        },
+      })
+
     case actions.UPDATE_SEND:
       return extend(metamaskState, {
         send: {

ui/app/selectors.js

@@ -24,6 +24,7 @@ const selectors = {
   getSendAmount,
   getSelectedTokenToFiatRate,
   getSelectedTokenContract,
+  getSendMaxModeState,
 }
 
 module.exports = selectors
@@ -135,6 +136,10 @@ function getSendAmount (state) {
   return state.metamask.send.amount
 }
 
+function getSendMaxModeState (state) {
+  return state.metamask.send.maxModeOn
+}
+
 function getCurrentCurrency (state) {
   return state.metamask.currentCurrency
 }

ui/app/send-v2.js

@@ -13,8 +13,6 @@ const GasFeeDisplay = require('./components/send/gas-fee-display-v2')
 
 const {
   MIN_GAS_TOTAL,
-  MIN_GAS_PRICE_HEX,
-  MIN_GAS_LIMIT_HEX,
 } = require('./components/send/send-constants')
 
 const {
@@ -313,8 +311,9 @@ SendTransactionScreen.prototype.renderToRow = function () {
 
 SendTransactionScreen.prototype.handleAmountChange = function (value) {
   const amount = value
-  const { updateSendAmount } = this.props
+  const { updateSendAmount, setMaxModeTo } = this.props
 
+  setMaxModeTo(false)
   this.validateAmount(amount)
   updateSendAmount(amount)
 }
@@ -324,11 +323,9 @@ SendTransactionScreen.prototype.setAmountToMax = function () {
     from: { balance },
     updateSendAmount,
     updateSendErrors,
-    updateGasPrice,
-    updateGasLimit,
-    updateGasTotal,
     tokenBalance,
     selectedToken,
+    gasTotal,
   } = this.props
   const { decimals } = selectedToken || {}
   const multiplier = Math.pow(10, Number(decimals || 0))
@@ -337,16 +334,12 @@ SendTransactionScreen.prototype.setAmountToMax = function () {
     ? multiplyCurrencies(tokenBalance, multiplier, {toNumericBase: 'hex'})
     : subtractCurrencies(
       ethUtil.addHexPrefix(balance),
-      ethUtil.addHexPrefix(MIN_GAS_TOTAL),
+      ethUtil.addHexPrefix(gasTotal),
       { toNumericBase: 'hex' }
     )
 
   updateSendErrors({ amount: null })
-  if (!selectedToken) {
-    updateGasPrice(MIN_GAS_PRICE_HEX)
-    updateGasLimit(MIN_GAS_LIMIT_HEX)
-    updateGasTotal(MIN_GAS_TOTAL)
-  }
+
   updateSendAmount(maxAmount)
 }
 
@@ -407,19 +400,22 @@ SendTransactionScreen.prototype.renderAmountRow = function () {
     amountConversionRate,
     errors,
     amount,
+    setMaxModeTo,
+    maxModeOn,
   } = this.props
 
   return h('div.send-v2__form-row', [
 
-    h('div.send-v2__form-label', [
+     h('div.send-v2__form-label', [
       'Amount:',
       this.renderErrorMessage('amount'),
       !errors.amount && h('div.send-v2__amount-max', {
         onClick: (event) => {
           event.preventDefault()
+          setMaxModeTo(true)
           this.setAmountToMax()
         },
-      }, [ 'Max' ]),
+      }, [ !maxModeOn ? 'Max' : '' ]),
     ]),
 
     h('div.send-v2__form-field', [