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/**
* 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;
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