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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
113 lines
2.8 KiB
JavaScript
113 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 InspectorOverlay
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*/
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'use strict';
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var Dimensions = require('Dimensions');
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var Inspector = require('Inspector');
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var React = require('React');
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var StyleSheet = require('StyleSheet');
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var Text = require('Text');
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var UIManager = require('NativeModules').UIManager;
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var View = require('View');
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var InspectorOverlay = React.createClass({
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getInitialState: function() {
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return {
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frame: null,
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hierarchy: [],
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};
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},
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findViewForTouchEvent: function(e) {
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var {locationX, locationY} = e.nativeEvent.touches[0];
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UIManager.findSubviewIn(
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this.props.inspectedViewTag,
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[locationX, locationY],
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(nativeViewTag, left, top, width, height) => {
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var instance = Inspector.findInstanceByNativeTag(this.props.rootTag, nativeViewTag);
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var hierarchy = Inspector.getOwnerHierarchy(instance);
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this.setState({
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hierarchy,
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frame: {left, top, width, height}
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});
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}
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);
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},
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shouldSetResponser: function(e) {
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this.findViewForTouchEvent(e);
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return true;
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},
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render: function() {
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var content = [];
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if (this.state.frame) {
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var distanceToTop = this.state.frame.top;
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var distanceToBottom = Dimensions.get('window').height -
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(this.state.frame.top + this.state.frame.height);
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var justifyContent = distanceToTop > distanceToBottom
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? 'flex-start'
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: 'flex-end';
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content.push(<View style={[styles.frame, this.state.frame]} />);
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content.push(<ElementProperties hierarchy={this.state.hierarchy} />);
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}
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return (
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<View
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onStartShouldSetResponder={this.shouldSetResponser}
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onResponderMove={this.findViewForTouchEvent}
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style={[styles.inspector, {justifyContent}]}>
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{content}
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</View>
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);
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}
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});
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var ElementProperties = React.createClass({
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render: function() {
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var path = this.props.hierarchy.map((instance) => instance.getName()).join(' > ');
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return (
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<View style={styles.info}>
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<Text style={styles.path}>
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{path}
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</Text>
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</View>
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);
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}
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});
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var styles = StyleSheet.create({
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inspector: {
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backgroundColor: 'rgba(255,255,255,0.8)',
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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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frame: {
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position: 'absolute',
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backgroundColor: 'rgba(155,155,255,0.3)',
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},
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info: {
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backgroundColor: 'rgba(0, 0, 0, 0.7)',
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padding: 10,
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},
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path: {
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color: 'white',
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fontSize: 9,
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}
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});
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module.exports = InspectorOverlay;
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