react-native/Libraries/Inspector.js

66 lines
2.0 KiB
JavaScript

/**
* 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
*/
'use strict';
var ReactInstanceHandles = require('ReactInstanceHandles');
var ReactInstanceMap = require('ReactInstanceMap');
var ReactNativeMount = require('ReactNativeMount');
var ReactNativeTagHandles = require('ReactNativeTagHandles');
function traverseOwnerTreeUp(hierarchy, instance) {
if (instance) {
hierarchy.unshift(instance);
traverseOwnerTreeUp(hierarchy, instance._currentElement._owner);
}
}
function findInstance(component, targetID) {
if (targetID === findRootNodeID(component)) {
return component;
}
if (component._renderedComponent) {
return findInstance(component._renderedComponent, targetID);
} else {
for (var key in component._renderedChildren) {
var child = component._renderedChildren[key];
if (ReactInstanceHandles.isAncestorIDOf(findRootNodeID(child), targetID)) {
var instance = findInstance(child, targetID);
if (instance) {
return instance;
}
}
}
}
}
function findRootNodeID(component) {
var internalInstance = ReactInstanceMap.get(component);
return internalInstance ? internalInstance._rootNodeID : component._rootNodeID;
}
function findInstanceByNativeTag(rootTag, nativeTag) {
var containerID = ReactNativeTagHandles.tagToRootNodeID[rootTag];
var rootInstance = ReactNativeMount._instancesByContainerID[containerID];
var targetID = ReactNativeTagHandles.tagToRootNodeID[nativeTag];
if (!targetID) {
return undefined;
}
return findInstance(rootInstance, targetID);
}
function getOwnerHierarchy(instance) {
var hierarchy = [];
traverseOwnerTreeUp(hierarchy, instance);
return hierarchy;
}
module.exports = {findInstanceByNativeTag, getOwnerHierarchy};