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