diff options
Diffstat (limited to 'node_modules/react-dom/lib/ReactMultiChild.js')
| -rw-r--r-- | node_modules/react-dom/lib/ReactMultiChild.js | 449 |
1 files changed, 449 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/ReactMultiChild.js b/node_modules/react-dom/lib/ReactMultiChild.js new file mode 100644 index 000000000..e52005ff2 --- /dev/null +++ b/node_modules/react-dom/lib/ReactMultiChild.js @@ -0,0 +1,449 @@ +/** + * Copyright 2013-present, 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. + * + */ + +'use strict'; + +var _prodInvariant = require('./reactProdInvariant'); + +var ReactComponentEnvironment = require('./ReactComponentEnvironment'); +var ReactInstanceMap = require('./ReactInstanceMap'); +var ReactInstrumentation = require('./ReactInstrumentation'); + +var ReactCurrentOwner = require('react/lib/ReactCurrentOwner'); +var ReactReconciler = require('./ReactReconciler'); +var ReactChildReconciler = require('./ReactChildReconciler'); + +var emptyFunction = require('fbjs/lib/emptyFunction'); +var flattenChildren = require('./flattenChildren'); +var invariant = require('fbjs/lib/invariant'); + +/** + * Make an update for markup to be rendered and inserted at a supplied index. + * + * @param {string} markup Markup that renders into an element. + * @param {number} toIndex Destination index. + * @private + */ +function makeInsertMarkup(markup, afterNode, toIndex) { + // NOTE: Null values reduce hidden classes. + return { + type: 'INSERT_MARKUP', + content: markup, + fromIndex: null, + fromNode: null, + toIndex: toIndex, + afterNode: afterNode + }; +} + +/** + * Make an update for moving an existing element to another index. + * + * @param {number} fromIndex Source index of the existing element. + * @param {number} toIndex Destination index of the element. + * @private + */ +function makeMove(child, afterNode, toIndex) { + // NOTE: Null values reduce hidden classes. + return { + type: 'MOVE_EXISTING', + content: null, + fromIndex: child._mountIndex, + fromNode: ReactReconciler.getHostNode(child), + toIndex: toIndex, + afterNode: afterNode + }; +} + +/** + * Make an update for removing an element at an index. + * + * @param {number} fromIndex Index of the element to remove. + * @private + */ +function makeRemove(child, node) { + // NOTE: Null values reduce hidden classes. + return { + type: 'REMOVE_NODE', + content: null, + fromIndex: child._mountIndex, + fromNode: node, + toIndex: null, + afterNode: null + }; +} + +/** + * Make an update for setting the markup of a node. + * + * @param {string} markup Markup that renders into an element. + * @private + */ +function makeSetMarkup(markup) { + // NOTE: Null values reduce hidden classes. + return { + type: 'SET_MARKUP', + content: markup, + fromIndex: null, + fromNode: null, + toIndex: null, + afterNode: null + }; +} + +/** + * Make an update for setting the text content. + * + * @param {string} textContent Text content to set. + * @private + */ +function makeTextContent(textContent) { + // NOTE: Null values reduce hidden classes. + return { + type: 'TEXT_CONTENT', + content: textContent, + fromIndex: null, + fromNode: null, + toIndex: null, + afterNode: null + }; +} + +/** + * Push an update, if any, onto the queue. Creates a new queue if none is + * passed and always returns the queue. Mutative. + */ +function enqueue(queue, update) { + if (update) { + queue = queue || []; + queue.push(update); + } + return queue; +} + +/** + * Processes any enqueued updates. + * + * @private + */ +function processQueue(inst, updateQueue) { + ReactComponentEnvironment.processChildrenUpdates(inst, updateQueue); +} + +var setChildrenForInstrumentation = emptyFunction; +if (process.env.NODE_ENV !== 'production') { + var getDebugID = function (inst) { + if (!inst._debugID) { + // Check for ART-like instances. TODO: This is silly/gross. + var internal; + if (internal = ReactInstanceMap.get(inst)) { + inst = internal; + } + } + return inst._debugID; + }; + setChildrenForInstrumentation = function (children) { + var debugID = getDebugID(this); + // TODO: React Native empty components are also multichild. + // This means they still get into this method but don't have _debugID. + if (debugID !== 0) { + ReactInstrumentation.debugTool.onSetChildren(debugID, children ? Object.keys(children).map(function (key) { + return children[key]._debugID; + }) : []); + } + }; +} + +/** + * ReactMultiChild are capable of reconciling multiple children. + * + * @class ReactMultiChild + * @internal + */ +var ReactMultiChild = { + + /** + * Provides common functionality for components that must reconcile multiple + * children. This is used by `ReactDOMComponent` to mount, update, and + * unmount child components. + * + * @lends {ReactMultiChild.prototype} + */ + Mixin: { + + _reconcilerInstantiateChildren: function (nestedChildren, transaction, context) { + if (process.env.NODE_ENV !== 'production') { + var selfDebugID = getDebugID(this); + if (this._currentElement) { + try { + ReactCurrentOwner.current = this._currentElement._owner; + return ReactChildReconciler.instantiateChildren(nestedChildren, transaction, context, selfDebugID); + } finally { + ReactCurrentOwner.current = null; + } + } + } + return ReactChildReconciler.instantiateChildren(nestedChildren, transaction, context); + }, + + _reconcilerUpdateChildren: function (prevChildren, nextNestedChildrenElements, mountImages, removedNodes, transaction, context) { + var nextChildren; + var selfDebugID = 0; + if (process.env.NODE_ENV !== 'production') { + selfDebugID = getDebugID(this); + if (this._currentElement) { + try { + ReactCurrentOwner.current = this._currentElement._owner; + nextChildren = flattenChildren(nextNestedChildrenElements, selfDebugID); + } finally { + ReactCurrentOwner.current = null; + } + ReactChildReconciler.updateChildren(prevChildren, nextChildren, mountImages, removedNodes, transaction, this, this._hostContainerInfo, context, selfDebugID); + return nextChildren; + } + } + nextChildren = flattenChildren(nextNestedChildrenElements, selfDebugID); + ReactChildReconciler.updateChildren(prevChildren, nextChildren, mountImages, removedNodes, transaction, this, this._hostContainerInfo, context, selfDebugID); + return nextChildren; + }, + + /** + * Generates a "mount image" for each of the supplied children. In the case + * of `ReactDOMComponent`, a mount image is a string of markup. + * + * @param {?object} nestedChildren Nested child maps. + * @return {array} An array of mounted representations. + * @internal + */ + mountChildren: function (nestedChildren, transaction, context) { + var children = this._reconcilerInstantiateChildren(nestedChildren, transaction, context); + this._renderedChildren = children; + + var mountImages = []; + var index = 0; + for (var name in children) { + if (children.hasOwnProperty(name)) { + var child = children[name]; + var selfDebugID = 0; + if (process.env.NODE_ENV !== 'production') { + selfDebugID = getDebugID(this); + } + var mountImage = ReactReconciler.mountComponent(child, transaction, this, this._hostContainerInfo, context, selfDebugID); + child._mountIndex = index++; + mountImages.push(mountImage); + } + } + + if (process.env.NODE_ENV !== 'production') { + setChildrenForInstrumentation.call(this, children); + } + + return mountImages; + }, + + /** + * Replaces any rendered children with a text content string. + * + * @param {string} nextContent String of content. + * @internal + */ + updateTextContent: function (nextContent) { + var prevChildren = this._renderedChildren; + // Remove any rendered children. + ReactChildReconciler.unmountChildren(prevChildren, false); + for (var name in prevChildren) { + if (prevChildren.hasOwnProperty(name)) { + !false ? process.env.NODE_ENV !== 'production' ? invariant(false, 'updateTextContent called on non-empty component.') : _prodInvariant('118') : void 0; + } + } + // Set new text content. + var updates = [makeTextContent(nextContent)]; + processQueue(this, updates); + }, + + /** + * Replaces any rendered children with a markup string. + * + * @param {string} nextMarkup String of markup. + * @internal + */ + updateMarkup: function (nextMarkup) { + var prevChildren = this._renderedChildren; + // Remove any rendered children. + ReactChildReconciler.unmountChildren(prevChildren, false); + for (var name in prevChildren) { + if (prevChildren.hasOwnProperty(name)) { + !false ? process.env.NODE_ENV !== 'production' ? invariant(false, 'updateTextContent called on non-empty component.') : _prodInvariant('118') : void 0; + } + } + var updates = [makeSetMarkup(nextMarkup)]; + processQueue(this, updates); + }, + + /** + * Updates the rendered children with new children. + * + * @param {?object} nextNestedChildrenElements Nested child element maps. + * @param {ReactReconcileTransaction} transaction + * @internal + */ + updateChildren: function (nextNestedChildrenElements, transaction, context) { + // Hook used by React ART + this._updateChildren(nextNestedChildrenElements, transaction, context); + }, + + /** + * @param {?object} nextNestedChildrenElements Nested child element maps. + * @param {ReactReconcileTransaction} transaction + * @final + * @protected + */ + _updateChildren: function (nextNestedChildrenElements, transaction, context) { + var prevChildren = this._renderedChildren; + var removedNodes = {}; + var mountImages = []; + var nextChildren = this._reconcilerUpdateChildren(prevChildren, nextNestedChildrenElements, mountImages, removedNodes, transaction, context); + if (!nextChildren && !prevChildren) { + return; + } + var updates = null; + var name; + // `nextIndex` will increment for each child in `nextChildren`, but + // `lastIndex` will be the last index visited in `prevChildren`. + var nextIndex = 0; + var lastIndex = 0; + // `nextMountIndex` will increment for each newly mounted child. + var nextMountIndex = 0; + var lastPlacedNode = null; + for (name in nextChildren) { + if (!nextChildren.hasOwnProperty(name)) { + continue; + } + var prevChild = prevChildren && prevChildren[name]; + var nextChild = nextChildren[name]; + if (prevChild === nextChild) { + updates = enqueue(updates, this.moveChild(prevChild, lastPlacedNode, nextIndex, lastIndex)); + lastIndex = Math.max(prevChild._mountIndex, lastIndex); + prevChild._mountIndex = nextIndex; + } else { + if (prevChild) { + // Update `lastIndex` before `_mountIndex` gets unset by unmounting. + lastIndex = Math.max(prevChild._mountIndex, lastIndex); + // The `removedNodes` loop below will actually remove the child. + } + // The child must be instantiated before it's mounted. + updates = enqueue(updates, this._mountChildAtIndex(nextChild, mountImages[nextMountIndex], lastPlacedNode, nextIndex, transaction, context)); + nextMountIndex++; + } + nextIndex++; + lastPlacedNode = ReactReconciler.getHostNode(nextChild); + } + // Remove children that are no longer present. + for (name in removedNodes) { + if (removedNodes.hasOwnProperty(name)) { + updates = enqueue(updates, this._unmountChild(prevChildren[name], removedNodes[name])); + } + } + if (updates) { + processQueue(this, updates); + } + this._renderedChildren = nextChildren; + + if (process.env.NODE_ENV !== 'production') { + setChildrenForInstrumentation.call(this, nextChildren); + } + }, + + /** + * Unmounts all rendered children. This should be used to clean up children + * when this component is unmounted. It does not actually perform any + * backend operations. + * + * @internal + */ + unmountChildren: function (safely) { + var renderedChildren = this._renderedChildren; + ReactChildReconciler.unmountChildren(renderedChildren, safely); + this._renderedChildren = null; + }, + + /** + * Moves a child component to the supplied index. + * + * @param {ReactComponent} child Component to move. + * @param {number} toIndex Destination index of the element. + * @param {number} lastIndex Last index visited of the siblings of `child`. + * @protected + */ + moveChild: function (child, afterNode, toIndex, lastIndex) { + // If the index of `child` is less than `lastIndex`, then it needs to + // be moved. Otherwise, we do not need to move it because a child will be + // inserted or moved before `child`. + if (child._mountIndex < lastIndex) { + return makeMove(child, afterNode, toIndex); + } + }, + + /** + * Creates a child component. + * + * @param {ReactComponent} child Component to create. + * @param {string} mountImage Markup to insert. + * @protected + */ + createChild: function (child, afterNode, mountImage) { + return makeInsertMarkup(mountImage, afterNode, child._mountIndex); + }, + + /** + * Removes a child component. + * + * @param {ReactComponent} child Child to remove. + * @protected + */ + removeChild: function (child, node) { + return makeRemove(child, node); + }, + + /** + * Mounts a child with the supplied name. + * + * NOTE: This is part of `updateChildren` and is here for readability. + * + * @param {ReactComponent} child Component to mount. + * @param {string} name Name of the child. + * @param {number} index Index at which to insert the child. + * @param {ReactReconcileTransaction} transaction + * @private + */ + _mountChildAtIndex: function (child, mountImage, afterNode, index, transaction, context) { + child._mountIndex = index; + return this.createChild(child, afterNode, mountImage); + }, + + /** + * Unmounts a rendered child. + * + * NOTE: This is part of `updateChildren` and is here for readability. + * + * @param {ReactComponent} child Component to unmount. + * @private + */ + _unmountChild: function (child, node) { + var update = this.removeChild(child, node); + child._mountIndex = null; + return update; + } + + } + +}; + +module.exports = ReactMultiChild;
\ No newline at end of file |