58 lines
1.2 KiB
JavaScript
58 lines
1.2 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow
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*/
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'use strict';
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/**
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* Resolve a style property into it's component parts, e.g.
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*
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* resolveProperties('margin', {margin: 5, marginBottom: 10})
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* ->
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* {top: 5, left: 5, right: 5, bottom: 10}
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*
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* If none are set, returns false.
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*/
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function resolveBoxStyle(prefix: string, style: Object): ?Object {
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const res = {};
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const subs = ['top', 'left', 'bottom', 'right'];
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let set = false;
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subs.forEach(sub => {
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res[sub] = style[prefix] || 0;
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});
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if (style[prefix]) {
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set = true;
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}
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if (style[prefix + 'Vertical']) {
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res.top = res.bottom = style[prefix + 'Vertical'];
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set = true;
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}
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if (style[prefix + 'Horizontal']) {
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res.left = res.right = style[prefix + 'Horizontal'];
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set = true;
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}
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subs.forEach(sub => {
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const val = style[prefix + capFirst(sub)];
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if (val) {
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res[sub] = val;
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set = true;
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}
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});
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if (!set) {
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return;
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}
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return res;
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}
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function capFirst(text) {
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return text[0].toUpperCase() + text.slice(1);
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}
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module.exports = resolveBoxStyle;
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