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react app

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Mario Romano
2016-04-06 17:52:19 +01:00
parent f7e6ef55a2
commit 29df96a085
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react-app/node_modules/react/lib/shouldUpdateReactComponent.js generated vendored Normal file
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/**
* Copyright 2013-2015, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule shouldUpdateReactComponent
* @typechecks static-only
*/
'use strict';
var warning = require("./warning");
/**
* Given a `prevElement` and `nextElement`, determines if the existing
* instance should be updated as opposed to being destroyed or replaced by a new
* instance. Both arguments are elements. This ensures that this logic can
* operate on stateless trees without any backing instance.
*
* @param {?object} prevElement
* @param {?object} nextElement
* @return {boolean} True if the existing instance should be updated.
* @protected
*/
function shouldUpdateReactComponent(prevElement, nextElement) {
if (prevElement != null && nextElement != null) {
var prevType = typeof prevElement;
var nextType = typeof nextElement;
if (prevType === 'string' || prevType === 'number') {
return (nextType === 'string' || nextType === 'number');
} else {
if (nextType === 'object' &&
prevElement.type === nextElement.type &&
prevElement.key === nextElement.key) {
var ownersMatch = prevElement._owner === nextElement._owner;
var prevName = null;
var nextName = null;
var nextDisplayName = null;
if ("production" !== process.env.NODE_ENV) {
if (!ownersMatch) {
if (prevElement._owner != null &&
prevElement._owner.getPublicInstance() != null &&
prevElement._owner.getPublicInstance().constructor != null) {
prevName =
prevElement._owner.getPublicInstance().constructor.displayName;
}
if (nextElement._owner != null &&
nextElement._owner.getPublicInstance() != null &&
nextElement._owner.getPublicInstance().constructor != null) {
nextName =
nextElement._owner.getPublicInstance().constructor.displayName;
}
if (nextElement.type != null &&
nextElement.type.displayName != null) {
nextDisplayName = nextElement.type.displayName;
}
if (nextElement.type != null && typeof nextElement.type === 'string') {
nextDisplayName = nextElement.type;
}
if (typeof nextElement.type !== 'string' ||
nextElement.type === 'input' ||
nextElement.type === 'textarea') {
if ((prevElement._owner != null &&
prevElement._owner._isOwnerNecessary === false) ||
(nextElement._owner != null &&
nextElement._owner._isOwnerNecessary === false)) {
if (prevElement._owner != null) {
prevElement._owner._isOwnerNecessary = true;
}
if (nextElement._owner != null) {
nextElement._owner._isOwnerNecessary = true;
}
("production" !== process.env.NODE_ENV ? warning(
false,
'<%s /> is being rendered by both %s and %s using the same ' +
'key (%s) in the same place. Currently, this means that ' +
'they don\'t preserve state. This behavior should be very ' +
'rare so we\'re considering deprecating it. Please contact ' +
'the React team and explain your use case so that we can ' +
'take that into consideration.',
nextDisplayName || 'Unknown Component',
prevName || '[Unknown]',
nextName || '[Unknown]',
prevElement.key
) : null);
}
}
}
}
return ownersMatch;
}
}
}
return false;
}
module.exports = shouldUpdateReactComponent;