| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | * |
| 7 | * @flow strict-local |
| 8 | */ |
| 9 | |
| 10 | 'use strict'; |
| 11 | |
| 12 | import {type ViewConfig} from './ReactNativeTypes'; |
| 13 | |
| 14 | // Event configs |
| 15 | export const customBubblingEventTypes = {}; |
| 16 | export const customDirectEventTypes = {}; |
| 17 | |
| 18 | const viewConfigCallbacks = new Map(); |
| 19 | const viewConfigs = new Map(); |
| 20 | |
| 21 | function processEventTypes(viewConfig: ViewConfig): void { |
| 22 | const {bubblingEventTypes, directEventTypes} = viewConfig; |
| 23 | |
| 24 | if (__DEV__) { |
| 25 | if (bubblingEventTypes != null && directEventTypes != null) { |
| 26 | for (const topLevelType in directEventTypes) { |
| 27 | if (bubblingEventTypes[topLevelType] != null) { |
| 28 | throw new Error( |
| 29 | `Event cannot be both direct and bubbling: ${topLevelType}`, |
| 30 | ); |
| 31 | } |
| 32 | } |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | if (bubblingEventTypes != null) { |
| 37 | for (const topLevelType in bubblingEventTypes) { |
| 38 | if (customBubblingEventTypes[topLevelType] == null) { |
| 39 | customBubblingEventTypes[topLevelType] = |
| 40 | bubblingEventTypes[topLevelType]; |
| 41 | } |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | if (directEventTypes != null) { |
| 46 | for (const topLevelType in directEventTypes) { |
| 47 | if (customDirectEventTypes[topLevelType] == null) { |
| 48 | customDirectEventTypes[topLevelType] = directEventTypes[topLevelType]; |
| 49 | } |
| 50 | } |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Registers a native view/component by name. |
| 56 | * A callback is provided to load the view config from UIManager. |
| 57 | * The callback is deferred until the view is actually rendered. |
| 58 | */ |
| 59 | export function register(name: string, callback: () => ViewConfig): string { |
| 60 | if (viewConfigCallbacks.has(name)) { |
| 61 | throw new Error(`Tried to register two views with the same name ${name}`); |
| 62 | } |
| 63 | |
| 64 | if (typeof callback !== 'function') { |
| 65 | throw new Error( |
| 66 | `View config getter callback for component \`${name}\` must be a function (received \`${ |
| 67 | callback === null ? 'null' : typeof callback |
| 68 | }\`)`, |
| 69 | ); |
| 70 | } |
| 71 | |
| 72 | viewConfigCallbacks.set(name, callback); |
| 73 | return name; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Retrieves a config for the specified view. |
| 78 | * If this is the first time the view has been used, |
| 79 | * This configuration will be lazy-loaded from UIManager. |
| 80 | */ |
| 81 | export function get(name: string): ViewConfig { |
| 82 | let viewConfig; |
| 83 | if (!viewConfigs.has(name)) { |
| 84 | const callback = viewConfigCallbacks.get(name); |
| 85 | if (typeof callback !== 'function') { |
| 86 | throw new Error( |
| 87 | `View config getter callback for component \`${name}\` must be a function (received \`${ |
| 88 | callback === null ? 'null' : typeof callback |
| 89 | }\`).${ |
| 90 | typeof name[0] === 'string' && /[a-z]/.test(name[0]) |
| 91 | ? ' Make sure to start component names with a capital letter.' |
| 92 | : '' |
| 93 | }`, |
| 94 | ); |
| 95 | } |
| 96 | viewConfig = callback(); |
| 97 | processEventTypes(viewConfig); |
| 98 | viewConfigs.set(name, viewConfig); |
| 99 | |
| 100 | // Clear the callback after the config is set so that |
| 101 | // we don't mask any errors during registration. |
| 102 | viewConfigCallbacks.set(name, null); |
| 103 | } else { |
| 104 | viewConfig = viewConfigs.get(name); |
| 105 | } |
| 106 | |
| 107 | if (!viewConfig) { |
| 108 | throw new Error(`View config not found for name ${name}`); |
| 109 | } |
| 110 | |
| 111 | return viewConfig; |
| 112 | } |