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Sebastian Markbage
c40e06f728
This moves all convenience constructors to use frozen ReactDescriptors.
45 lines
1.6 KiB
JavaScript
45 lines
1.6 KiB
JavaScript
/**
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* Copyright 2013-2014 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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/**
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* Given a `prevDescriptor` and `nextDescriptor`, determines if the existing
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* instance should be updated as opposed to being destroyed or replaced by a new
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* instance. Both arguments are descriptors. This ensures that this logic can
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* operate on stateless trees without any backing instance.
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*
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* @param {?object} prevDescriptor
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* @param {?object} nextDescriptor
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* @return {boolean} True if the existing instance should be updated.
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* @protected
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*/
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function shouldUpdateReactComponent(prevDescriptor, nextDescriptor) {
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if (prevDescriptor && nextDescriptor &&
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prevDescriptor.type === nextDescriptor.type && (
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(prevDescriptor.props && prevDescriptor.props.key) ===
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(nextDescriptor.props && nextDescriptor.props.key)
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) && prevDescriptor._owner === nextDescriptor._owner) {
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return true;
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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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