react-native/Libraries/Experimental/IncrementalGroup.js

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/**
* Copyright (c) 2015-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.
*
* @providesModule IncrementalGroup
* @flow
*/
'use strict';
const Incremental = require('Incremental');
const React = require('React');
const PropTypes = require('prop-types');
const infoLog = require('infoLog');
let _groupCounter = -1;
const DEBUG = false;
import type {Props, Context} from 'Incremental';
/**
* WARNING: EXPERIMENTAL. Breaking changes will probably happen a lot and will
* not be reliably announced. The whole thing might be deleted, who knows? Use
* at your own risk.
*
* `<Incremental>` components must be wrapped in an `<IncrementalGroup>` (e.g.
* via `<IncrementalPresenter>`) in order to provide the incremental group
* context, otherwise they will do nothing.
*
* See Incremental.js for more info.
*/
class IncrementalGroup extends React.Component<Props & {disabled?: boolean}> {
context: Context;
_groupInc: string;
componentWillMount() {
this._groupInc = `g${++_groupCounter}-`;
DEBUG && infoLog(
'create IncrementalGroup with id ' + this.getGroupId()
);
}
getGroupId(): string {
const ctx = this.context.incrementalGroup;
const prefix = ctx ? ctx.groupId + ':' : '';
return prefix + this._groupInc + this.props.name;
}
getChildContext(): Context {
if (this.props.disabled || this.context.incrementalGroupEnabled === false) {
return {
incrementalGroupEnabled: false,
incrementalGroup: null,
};
}
return {
incrementalGroupEnabled: true,
incrementalGroup: {
groupId: this.getGroupId(),
incrementalCount: -1,
},
};
}
render(): React.Node {
return (
<Incremental
onDone={this.props.onDone}
children={this.props.children}
/>
);
}
}
IncrementalGroup.contextTypes = {
incrementalGroup: PropTypes.object,
incrementalGroupEnabled: PropTypes.bool,
};
IncrementalGroup.childContextTypes = IncrementalGroup.contextTypes;
module.exports = IncrementalGroup;