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Merge branch 'develop' of github.com:MetaMask/metamask-extension into ValidateEmptyKey
Diffstat (limited to 'ui/app/components/send_/send-content/send-amount-row/amount-max-button/amount-max-button.utils.js')
-rw-r--r-- | ui/app/components/send_/send-content/send-amount-row/amount-max-button/amount-max-button.utils.js | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/ui/app/components/send_/send-content/send-amount-row/amount-max-button/amount-max-button.utils.js b/ui/app/components/send_/send-content/send-amount-row/amount-max-button/amount-max-button.utils.js new file mode 100644 index 000000000..b490a7fd7 --- /dev/null +++ b/ui/app/components/send_/send-content/send-amount-row/amount-max-button/amount-max-button.utils.js @@ -0,0 +1,22 @@ +const { + multiplyCurrencies, + subtractCurrencies, +} = require('../../../../../conversion-util') +const ethUtil = require('ethereumjs-util') + +function calcMaxAmount ({ balance, gasTotal, selectedToken, tokenBalance }) { + const { decimals } = selectedToken || {} + const multiplier = Math.pow(10, Number(decimals || 0)) + + return selectedToken + ? multiplyCurrencies(tokenBalance, multiplier, {toNumericBase: 'hex'}) + : subtractCurrencies( + ethUtil.addHexPrefix(balance), + ethUtil.addHexPrefix(gasTotal), + { toNumericBase: 'hex' } + ) +} + +module.exports = { + calcMaxAmount, +} |