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cfa4b13472
Summary:
This adds new development feature to React Native that provides information
about selected element (see the demo in Test Plan).
This is how it works:
App's root component is rendered to a container that also has a hidden layer called
`<InspectorOverlay/>`. When activated, it shows full screen view and captures all
touches. On every touch we ask UIManager to find a view for given {x,y} coordinates.
Then, we use React's internals to find corresponding React component. `setRootInstance`
is used to remember the top level component to start search from, lmk if you have a
better idea how to do this. Given a component, we can climb up its owners tree
to provice more context on how/where the component is used.
In future we could use the `hierarchy` array to inspect and print their props/state.
Known bugs and limitations:
* InspectorOverlay sometimes receives touches with incorrect coordinates (wtf)
* Not integrated with React Chrome Devtools (maybe in followup diffs)
* Doesn't work with popovers (maybe put the element inspector into an `<Overlay/>`?)
@public
Test Plan:
https://www.facebook.com/pxlcld/mn5k
Works nicely with scrollviews
93 lines
2.2 KiB
JavaScript
93 lines
2.2 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 renderApplication
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*/
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'use strict';
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var InspectorOverlay = require('InspectorOverlay');
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var RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
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var React = require('React');
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var StyleSheet = require('StyleSheet');
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var Subscribable = require('Subscribable');
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var View = require('View');
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var WarningBox = require('WarningBox');
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var invariant = require('invariant');
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var AppContainer = React.createClass({
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mixins: [Subscribable.Mixin],
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getInitialState: function() {
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return { inspector: null };
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},
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toggleElementInspector: function() {
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var inspector = this.state.inspector
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? null
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: <InspectorOverlay
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rootTag={this.props.rootTag}
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inspectedViewTag={React.findNodeHandle(this.refs.main)}
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/>;
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this.setState({inspector});
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},
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componentDidMount: function() {
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this.addListenerOn(
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RCTDeviceEventEmitter,
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'toggleElementInspector',
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this.toggleElementInspector
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);
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},
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render: function() {
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var shouldRenderWarningBox = __DEV__ && console.yellowBoxEnabled;
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var warningBox = shouldRenderWarningBox ? <WarningBox /> : null;
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return (
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<View style={styles.appContainer}>
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<View style={styles.appContainer} ref="main">
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{this.props.children}
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</View>
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{warningBox}
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{this.state.inspector}
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</View>
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);
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}
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});
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function renderApplication<D, P, S>(
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RootComponent: ReactClass<D, P, S>,
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initialProps: P,
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rootTag: any
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) {
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invariant(
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rootTag,
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'Expect to have a valid rootTag, instead got ', rootTag
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);
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React.render(
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<AppContainer rootTag={rootTag}>
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<RootComponent
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{...initialProps}
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/>
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</AppContainer>,
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rootTag
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);
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}
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var styles = StyleSheet.create({
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appContainer: {
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position: 'absolute',
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left: 0,
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top: 0,
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right: 0,
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bottom: 0,
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},
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});
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module.exports = renderApplication;
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