119 lines
3.8 KiB
JavaScript
119 lines
3.8 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule diffRawProperties
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* @flow
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*/
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'use strict';
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var deepDiffer = require('deepDiffer');
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/**
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* diffRawProperties takes two sets of props and a set of valid attributes
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* and write to updatePayload the values that changed or were deleted
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*
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* @param {?object} updatePayload Overriden with the props that changed.
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* @param {!object} prevProps Previous properties to diff against current
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* properties. These properties are as supplied to component construction.
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* @param {!object} prevProps Next "current" properties to diff against
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* previous. These properties are as supplied to component construction.
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* @return {?object}
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*/
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function diffRawProperties(
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updatePayload: ?Object,
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prevProps: ?Object,
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nextProps: ?Object,
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validAttributes: Object
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): ?Object {
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var validAttributeConfig;
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var nextProp;
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var prevProp;
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var isScalar;
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var shouldUpdate;
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var differ;
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if (nextProps) {
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for (var propKey in nextProps) {
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validAttributeConfig = validAttributes[propKey];
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if (!validAttributeConfig) {
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continue; // not a valid native prop
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}
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prevProp = prevProps && prevProps[propKey];
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nextProp = nextProps[propKey];
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// functions are converted to booleans as markers that the associated
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// events should be sent from native.
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if (typeof prevProp === 'function') {
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prevProp = true;
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}
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if (typeof nextProp === 'function') {
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nextProp = true;
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}
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if (prevProp !== nextProp) {
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// Scalars and new props are always updated. Objects use deepDiffer by
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// default, but can be optimized with custom differs.
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differ = validAttributeConfig.diff || deepDiffer;
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isScalar = typeof nextProp !== 'object' || nextProp === null;
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shouldUpdate = isScalar || !prevProp || differ(prevProp, nextProp);
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if (shouldUpdate) {
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updatePayload = updatePayload || {};
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updatePayload[propKey] = nextProp;
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}
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}
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}
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}
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// Also iterate through all the previous props to catch any that have been
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// removed and make sure native gets the signal so it can reset them to the
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// default.
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if (prevProps) {
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for (var propKey in prevProps) {
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validAttributeConfig = validAttributes[propKey];
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if (!validAttributeConfig) {
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continue; // not a valid native prop
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}
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if (updatePayload && updatePayload[propKey] !== undefined) {
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continue; // Prop already specified
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}
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prevProp = prevProps[propKey];
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nextProp = nextProps && nextProps[propKey];
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// functions are converted to booleans as markers that the associated
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// events should be sent from native.
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if (typeof prevProp === 'function') {
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prevProp = true;
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}
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if (typeof nextProp === 'function') {
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nextProp = true;
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}
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if (prevProp !== nextProp) {
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if (nextProp === undefined) {
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nextProp = null; // null is a sentinel we explicitly send to native
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}
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// Scalars and new props are always updated. Objects use deepDiffer by
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// default, but can be optimized with custom differs.
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differ = validAttributeConfig.diff || deepDiffer;
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isScalar = typeof nextProp !== 'object' || nextProp === null;
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shouldUpdate =
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isScalar &&
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prevProp !== nextProp ||
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differ(prevProp, nextProp);
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if (shouldUpdate) {
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updatePayload = updatePayload || {};
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updatePayload[propKey] = nextProp;
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}
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}
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}
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}
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return updatePayload;
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}
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module.exports = diffRawProperties;
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