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Ben Alpert
265
Libraries/ReactIOS/ReactIOSNativeComponent.js
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265
Libraries/ReactIOS/ReactIOSNativeComponent.js
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/**
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* Copyright 2004-present Facebook. All Rights Reserved.
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*
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* @providesModule ReactIOSNativeComponent
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*/
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'use strict';
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var NativeMethodsMixin = require('NativeMethodsMixin');
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var ReactComponent = require('ReactComponent');
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var ReactIOSComponentMixin = require('ReactIOSComponentMixin');
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var ReactIOSEventEmitter = require('ReactIOSEventEmitter');
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var ReactIOSStyleAttributes = require('ReactIOSStyleAttributes');
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var ReactIOSTagHandles = require('ReactIOSTagHandles');
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var ReactMultiChild = require('ReactMultiChild');
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var RKUIManager = require('NativeModulesDeprecated').RKUIManager;
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var styleDiffer = require('styleDiffer');
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var deepFreezeAndThrowOnMutationInDev = require('deepFreezeAndThrowOnMutationInDev');
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var diffRawProperties = require('diffRawProperties');
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var flattenStyle = require('flattenStyle');
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var warning = require('warning');
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var registrationNames = ReactIOSEventEmitter.registrationNames;
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var putListener = ReactIOSEventEmitter.putListener;
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var deleteAllListeners = ReactIOSEventEmitter.deleteAllListeners;
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/**
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* @constructor ReactIOSNativeComponent
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* @extends ReactComponent
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* @extends ReactMultiChild
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* @param {!object} UIKit View Configuration.
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*/
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var ReactIOSNativeComponent = function(viewConfig) {
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this.viewConfig = viewConfig;
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this.props = null;
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this.previousFlattenedStyle = null;
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};
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/**
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* Generates and caches arrays of the form:
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*
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* [0, 1, 2, 3]
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* [0, 1, 2, 3, 4]
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* [0, 1]
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*
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* @param {number} size Size of array to generate.
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* @return {Array<number>} Array with values that mirror the index.
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*/
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var cachedIndexArray = function(size) {
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var cachedResult = cachedIndexArray._cache[size];
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if (!cachedResult) {
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var arr = [];
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for (var i = 0; i < size; i++) {
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arr[i] = i;
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}
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return cachedIndexArray._cache[size] = arr;
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} else {
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return cachedResult;
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}
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};
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cachedIndexArray._cache = {};
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/**
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* Mixin for containers that contain UIViews. NOTE: markup is rendered markup
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* which is a `viewID` ... see the return value for `mountComponent` !
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*/
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ReactIOSNativeComponent.Mixin = {
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unmountComponent: function() {
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deleteAllListeners(this._rootNodeID);
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ReactComponent.Mixin.unmountComponent.call(this);
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this.unmountChildren();
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},
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/**
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* Every native component is responsible for allocating its own `tag`, and
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* issuing the native `createView` command. But it is not responsible for
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* recording the fact that its own `rootNodeID` is associated with a
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* `nodeHandle`. Only the code that actually adds its `nodeHandle` (`tag`) as
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* a child of a container can confidently record that in
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* `ReactIOSTagHandles`.
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*/
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initializeChildren: function(children, containerTag, transaction) {
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var mountImages = this.mountChildren(children, transaction);
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// In a well balanced tree, half of the nodes are in the bottom row and have
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// no children - let's avoid calling out to the native bridge for a large
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// portion of the children.
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if (mountImages.length) {
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var indexes = cachedIndexArray(mountImages.length);
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// TODO: Pool these per platform view class. Reusing the `mountImages`
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// array would likely be a jit deopt.
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var createdTags = [];
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for (var i = 0; i < mountImages.length; i++) {
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var mountImage = mountImages[i];
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var childTag = mountImage.tag;
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var childID = mountImage.rootNodeID;
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warning(
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mountImage && mountImage.rootNodeID && mountImage.tag,
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'Mount image returned does not have required data'
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);
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ReactIOSTagHandles.associateRootNodeIDWithMountedNodeHandle(
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childID,
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childTag
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);
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createdTags[i] = mountImage.tag;
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}
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RKUIManager
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.manageChildren(containerTag, null, null, createdTags, indexes, null);
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}
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},
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/**
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* Beware, this function has side effect to store this.previousFlattenedStyle!
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*
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* @param {!object} prevProps Previous properties
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* @param {!object} nextProps Next properties
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* @param {!object} validAttributes Set of valid attributes and how they
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* should be diffed
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*/
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computeUpdatedProperties: function(prevProps, nextProps, validAttributes) {
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if (__DEV__) {
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for (var key in nextProps) {
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if (nextProps.hasOwnProperty(key) &&
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nextProps[key] &&
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validAttributes[key]) {
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deepFreezeAndThrowOnMutationInDev(nextProps[key]);
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}
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}
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}
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var updatePayload = diffRawProperties(
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null, // updatePayload
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prevProps,
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nextProps,
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validAttributes
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);
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// The style property is a deeply nested element which includes numbers
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// to represent static objects. Most of the time, it doesn't change across
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// renders, so it's faster to spend the time checking if it is different
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// before actually doing the expensive flattening operation in order to
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// compute the diff.
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if (styleDiffer(nextProps.style, prevProps.style)) {
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var nextFlattenedStyle = flattenStyle(nextProps.style);
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updatePayload = diffRawProperties(
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updatePayload,
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this.previousFlattenedStyle,
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nextFlattenedStyle,
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ReactIOSStyleAttributes
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);
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this.previousFlattenedStyle = nextFlattenedStyle;
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}
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return updatePayload;
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},
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/**
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* Updates the component's currently mounted representation.
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*
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* @param {ReactReconcileTransaction} transaction
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* @param {object} prevDescriptor
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* @internal
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*/
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updateComponent: function(transaction, prevDescriptor) {
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ReactComponent.Mixin.updateComponent.call(
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this,
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transaction,
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prevDescriptor
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);
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var nextDescriptor = this._currentElement;
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var updatePayload = this.computeUpdatedProperties(
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prevDescriptor.props,
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nextDescriptor.props,
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this.viewConfig.validAttributes
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);
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if (updatePayload) {
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RKUIManager.updateView(
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ReactIOSTagHandles.mostRecentMountedNodeHandleForRootNodeID(this._rootNodeID),
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this.viewConfig.uiViewClassName,
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updatePayload
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);
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}
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this._reconcileListenersUponUpdate(
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prevDescriptor.props,
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nextDescriptor.props
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);
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this.updateChildren(this.props.children, transaction);
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},
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/**
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* @param {object} initialProps Native component props.
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*/
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_registerListenersUponCreation: function(initialProps) {
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for (var key in initialProps) {
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// NOTE: The check for `!props[key]`, is only possible because this method
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// registers listeners the *first* time a component is created.
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if (registrationNames[key] && initialProps[key]) {
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var listener = initialProps[key];
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putListener(this._rootNodeID, key, listener);
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}
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}
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},
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/**
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* Reconciles event listeners, adding or removing if necessary.
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* @param {object} prevProps Native component props including events.
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* @param {object} nextProps Next native component props including events.
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*/
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_reconcileListenersUponUpdate: function(prevProps, nextProps) {
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for (var key in nextProps) {
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if (registrationNames[key] && (nextProps[key] != prevProps[key])) {
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putListener(this._rootNodeID, key, nextProps[key]);
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}
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}
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},
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/**
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* @param {string} rootID Root ID of this subtree.
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* @param {Transaction} transaction For creating/updating.
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* @return {string} Unique iOS view tag.
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*/
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mountComponent: function(rootID, transaction, mountDepth) {
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ReactComponent.Mixin.mountComponent.call(
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this,
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rootID,
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transaction,
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mountDepth
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);
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var tag = ReactIOSTagHandles.allocateTag();
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this.previousFlattenedStyle = {};
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var updatePayload = this.computeUpdatedProperties(
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{}, // previous props
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this.props, // next props
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this.viewConfig.validAttributes
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);
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RKUIManager.createView(tag, this.viewConfig.uiViewClassName, updatePayload);
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this._registerListenersUponCreation(this.props);
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this.initializeChildren(this.props.children, tag, transaction);
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return {
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rootNodeID: rootID,
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tag: tag
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};
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}
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};
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/**
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* Order of mixins is important. ReactIOSNativeComponent overrides methods in
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* ReactMultiChild.
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*/
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Object.assign(
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ReactIOSNativeComponent.prototype,
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ReactComponent.Mixin,
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ReactMultiChild.Mixin,
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ReactIOSNativeComponent.Mixin,
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NativeMethodsMixin,
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ReactIOSComponentMixin
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);
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module.exports = ReactIOSNativeComponent;
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