115 lines
2.7 KiB
JavaScript
115 lines
2.7 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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const I18nManager = require('../ReactNative/I18nManager');
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/**
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* Resolve a style property into its component parts.
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*
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* For example:
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*
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* > resolveProperties('margin', {margin: 5, marginBottom: 10})
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* {top: 5, left: 5, right: 5, bottom: 10}
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*
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* If no parts exist, this returns null.
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*/
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function resolveBoxStyle(
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prefix: string,
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style: Object,
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): ?$ReadOnly<{|
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bottom: number,
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left: number,
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right: number,
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top: number,
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|}> {
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let hasParts = false;
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const result = {
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bottom: 0,
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left: 0,
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right: 0,
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top: 0,
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};
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// TODO: Fix issues with multiple properties affecting the same side.
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const styleForAll = style[prefix];
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if (styleForAll != null) {
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for (const key of Object.keys(result)) {
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result[key] = styleForAll;
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}
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hasParts = true;
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}
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const styleForHorizontal = style[prefix + 'Horizontal'];
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if (styleForHorizontal != null) {
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result.left = styleForHorizontal;
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result.right = styleForHorizontal;
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hasParts = true;
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} else {
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const styleForLeft = style[prefix + 'Left'];
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if (styleForLeft != null) {
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result.left = styleForLeft;
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hasParts = true;
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}
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const styleForRight = style[prefix + 'Right'];
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if (styleForRight != null) {
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result.right = styleForRight;
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hasParts = true;
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}
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const styleForEnd = style[prefix + 'End'];
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if (styleForEnd != null) {
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const constants = I18nManager.getConstants();
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if (constants.isRTL && constants.doLeftAndRightSwapInRTL) {
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result.left = styleForEnd;
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} else {
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result.right = styleForEnd;
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}
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hasParts = true;
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}
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const styleForStart = style[prefix + 'Start'];
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if (styleForStart != null) {
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const constants = I18nManager.getConstants();
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if (constants.isRTL && constants.doLeftAndRightSwapInRTL) {
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result.right = styleForStart;
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} else {
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result.left = styleForStart;
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}
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hasParts = true;
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}
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}
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const styleForVertical = style[prefix + 'Vertical'];
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if (styleForVertical != null) {
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result.bottom = styleForVertical;
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result.top = styleForVertical;
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hasParts = true;
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} else {
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const styleForBottom = style[prefix + 'Bottom'];
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if (styleForBottom != null) {
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result.bottom = styleForBottom;
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hasParts = true;
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}
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const styleForTop = style[prefix + 'Top'];
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if (styleForTop != null) {
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result.top = styleForTop;
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hasParts = true;
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}
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}
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return hasParts ? result : null;
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}
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module.exports = resolveBoxStyle;
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