74 lines
2.1 KiB
JavaScript
74 lines
2.1 KiB
JavaScript
////////////////////////////////////////////////////////////////////////////
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//
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// Copyright 2016 Realm Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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////////////////////////////////////////////////////////////////////////////
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'use strict';
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import React from 'react-native';
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const rootComponentPromise = new Promise((resolve) => {
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// Require internal module here so the promise is rejected if there is an error.
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let Mount = require('react-native/Libraries/ReactNative/ReactNativeMount');
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let renderComponent = Mount.renderComponent;
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Mount.renderComponent = function() {
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let component = renderComponent.apply(this, arguments);
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resolve(component);
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return component;
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};
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});
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export function getRootComponent() {
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return rootComponentPromise;
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}
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export function assertChildExists(component, name) {
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if (!findChildComponent(component, name)) {
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throw new Error(name + ' not rendered');
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}
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}
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export function findChildComponent(component, name) {
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for (let child of traverseChildren(component)) {
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if (child.type.name == name) {
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return child;
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}
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}
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return null;
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}
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export function* traverseChildren(component) {
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let props = component.props;
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// The hacky TopLevelWrapper has its props set to the root element.
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if (props.props) {
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props = props.props;
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}
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let children = props.children;
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if (!children) {
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return;
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}
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// ReactNative is missing React.Children.toArray()
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for (let child of React.Children.map(children, (x) => x)) {
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yield child;
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yield* traverseChildren(child);
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}
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}
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