react-native/Libraries/Inspector/Inspector.js

/**
 * 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 Inspector
 * @flow
 */
'use strict';

var Dimensions = require('Dimensions');
var InspectorOverlay = require('InspectorOverlay');
var InspectorPanel = require('InspectorPanel');
var InspectorUtils = require('InspectorUtils');
var React = require('React');
var StyleSheet = require('StyleSheet');
var UIManager = require('NativeModules').UIManager;
var View = require('View');

class Inspector extends React.Component {
  constructor(props: Object) {
    super(props);
    this.state = {
      panelPos: 'bottom',
      inspecting: true,
      inspected: null,
    };
  }

  setSelection(i: number) {
    var instance = this.state.hierarchy[i];
    var publicInstance = instance.getPublicInstance();
    UIManager.measure(React.findNodeHandle(instance), (x, y, width, height, left, top) => {
      this.setState({
        inspected: {
          frame: {left, top, width, height},
          style: publicInstance.props ? publicInstance.props.style : {},
        },
        selection: i,
      });
    });
  }

  onTouchInstance(instance: Object, frame: Object, pointerY: number) {
    var hierarchy = InspectorUtils.getOwnerHierarchy(instance);
    var publicInstance = instance.getPublicInstance();
    var props = publicInstance.props || {};
    this.setState({
      panelPos: pointerY > Dimensions.get('window').height / 2 ? 'top' : 'bottom',
      selection: hierarchy.length - 1,
      hierarchy,
      inspected: {
        style: props.style || {},
        frame,
      },
    });
  }

  setInspecting(val: bool) {
    this.setState({
      inspecting: val,
    });
  }

  render() {
    var panelPosition;
    if (this.state.panelPos === 'bottom') {
      panelPosition = {bottom: -Dimensions.get('window').height};
    } else {
      panelPosition = {top: 0};
    }
    return (
      <View style={styles.container}>
        {this.state.inspecting &&
          <InspectorOverlay
            rootTag={this.props.rootTag}
            inspected={this.state.inspected}
            inspectedViewTag={this.props.inspectedViewTag}
            onTouchInstance={this.onTouchInstance.bind(this)}
          />}
        <View style={[styles.panelContainer, panelPosition]}>
          <InspectorPanel
            inspecting={this.state.inspecting}
            setInspecting={this.setInspecting.bind(this)}
            inspected={this.state.inspected}
            hierarchy={this.state.hierarchy}
            selection={this.state.selection}
            setSelection={this.setSelection.bind(this)}
          />
        </View>
      </View>
    );
  }
}

var styles = StyleSheet.create({
  container: {
    position: 'absolute',
    backgroundColor: 'transparent',
    top: 0,
    left: 0,
    right: 0,
    height: 0,
  },
  panelContainer: {
    position: 'absolute',
    left: 0,
    right: 0,
  },
});

module.exports = Inspector;