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b0431a51ca
Now when a `key` prop appears, its value is always honored. This means that in the root component or as an only child, changing key will cause remounting; in a `children` object, the `key` prop will be joined with the object key to form a two-part key. Fixes #590.
61 lines
2.0 KiB
JavaScript
61 lines
2.0 KiB
JavaScript
/**
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* Copyright 2013 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @providesModule shouldUpdateReactComponent
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* @typechecks static-only
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*/
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"use strict";
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var getComponentKey = require('getComponentKey');
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/**
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* Given a `prevComponent` and `nextComponent`, determines if `prevComponent`
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* should be updated as opposed to being destroyed or replaced.
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*
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* @param {?object} prevComponent
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* @param {?object} nextComponent
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* @return {boolean} True if `prevComponent` should be updated.
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* @protected
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*/
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function shouldUpdateReactComponent(prevComponent, nextComponent) {
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// TODO: Remove warning after a release.
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if (prevComponent && nextComponent &&
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prevComponent.constructor === nextComponent.constructor) {
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if (prevComponent._owner === nextComponent._owner && (
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getComponentKey(prevComponent, /* index: */ 0) ===
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getComponentKey(nextComponent, /* index: */ 0)
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)) {
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return true;
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} else {
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if (__DEV__) {
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if (prevComponent.state) {
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console.warn(
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'A recent change to React has been found to impact your code. ' +
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'A mounted component will now be unmounted and replaced by a ' +
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'component (of the same class) if their owners are different. ' +
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'Previously, ownership was not considered when updating.',
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prevComponent,
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nextComponent
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);
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}
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}
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}
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}
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return false;
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}
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module.exports = shouldUpdateReactComponent;
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