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Summary:Everything wrapped in `<Incremental>` is rendered sequentially via `InteractionManager`. The `onDone` callback is called when all descendent incremental components have finished rendering, used by `<IncrementalPresenter>` to make the story visible all at once instead of the parts popping in randomly. This includes an example that demonstrates streaming rendering and the use of `<IncrementalPresenter>`. Pressing down pauses rendering and you can see the `TouchableOpacity` animation runs smoothly. Video: https://youtu.be/4UNf4-8orQ4 Ideally this will be baked into React Core at some point, but according to jordwalke that's going to require a major refactoring and take a long time, so going with this for now. Reviewed By: ericvicenti Differential Revision: D2506522 fb-gh-sync-id: 5969bf248de10d38b0ac22f34d7d49bf1b3ac4b6 shipit-source-id: 5969bf248de10d38b0ac22f34d7d49bf1b3ac4b6
96 lines
2.8 KiB
JavaScript
96 lines
2.8 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule IncrementalPresenter
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* @flow
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*/
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'use strict';
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const IncrementalGroup = require('IncrementalGroup');
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const React = require('React');
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const View = require('View');
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import type {Context} from 'Incremental';
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/**
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* WARNING: EXPERIMENTAL. Breaking changes will probably happen a lot and will
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* not be reliably announced. The whole thing might be deleted, who knows? Use
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* at your own risk.
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*
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* `<IncrementalPresenter>` can be used to group sets of `<Incremental>` renders
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* such that they are initially invisible and removed from layout until all
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* decendents have finished rendering, at which point they are drawn all at once
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* so the UI doesn't jump around during the incremental rendering process.
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*
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* See Incremental.js for more info.
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*/
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type Props = {
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name: string;
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disabled: boolean;
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onDone: () => void;
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onLayout: (event: Object) => void;
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style: mixed;
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children: any;
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}
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class IncrementalPresenter extends React.Component {
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props: Props;
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context: Context;
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_isDone: boolean;
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constructor(props: Props, context: Context) {
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super(props, context);
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this._isDone = false;
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(this: any).onDone = this.onDone.bind(this);
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}
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onDone() {
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this._isDone = true;
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if (this.props.disabled !== true &&
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this.context.incrementalGroupEnabled !== false) {
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// Avoid expensive re-renders and use setNativeProps
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this.refs.view.setNativeProps(
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{style: [this.props.style, {opacity: 1, position: 'relative'}]}
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);
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}
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this.props.onDone && this.props.onDone();
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}
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render() {
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if (this.props.disabled !== true &&
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this.context.incrementalGroupEnabled !== false &&
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!this._isDone) {
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var style = [this.props.style, {opacity: 0, position: 'absolute'}];
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} else {
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var style = this.props.style;
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}
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return (
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<IncrementalGroup
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onDone={this.onDone}
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name={this.props.name}
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disabled={this.props.disabled}>
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<View
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children={this.props.children}
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ref="view"
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style={style}
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onLayout={this.props.onLayout}
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/>
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</IncrementalGroup>
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);
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}
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}
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IncrementalPresenter.propTypes = {
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name: React.PropTypes.string,
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disabled: React.PropTypes.bool,
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onDone: React.PropTypes.func,
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onLayout: React.PropTypes.func,
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style: View.propTypes.style,
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};
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IncrementalPresenter.contextTypes = {
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incrementalGroup: React.PropTypes.object,
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incrementalGroupEnabled: React.PropTypes.bool,
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};
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module.exports = IncrementalPresenter;
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