98 lines
2.6 KiB
JavaScript
98 lines
2.6 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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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 PropTypes = require('prop-types');
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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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import type {ViewStyleProp} from 'StyleSheet';
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import type {LayoutEvent} from 'CoreEventTypes';
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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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* descendants 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 = $ReadOnly<{|
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name: string,
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disabled?: boolean,
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onDone?: () => mixed,
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onLayout?: (event: LayoutEvent) => mixed,
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style?: ViewStyleProp,
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children?: React.Node,
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|}>;
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class IncrementalPresenter extends React.Component<Props> {
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context: Context;
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_isDone: boolean;
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static contextTypes = {
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incrementalGroup: PropTypes.object,
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incrementalGroupEnabled: PropTypes.bool,
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};
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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 (
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this.props.disabled !== true &&
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this.context.incrementalGroupEnabled !== false
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) {
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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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let style: ViewStyleProp;
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if (
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this.props.disabled !== true &&
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this.context.incrementalGroupEnabled !== false &&
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!this._isDone
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) {
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style = [this.props.style, {opacity: 0, position: 'absolute'}];
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} else {
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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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module.exports = IncrementalPresenter;
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