@angular/elements
Version:
Angular - library for using Angular Components as Custom Elements
104 lines • 12.8 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { ComponentFactoryResolver } from '@angular/core';
/**
* Provide methods for scheduling the execution of a callback.
*/
export const scheduler = {
/**
* Schedule a callback to be called after some delay.
*
* Returns a function that when executed will cancel the scheduled function.
*/
schedule(taskFn, delay) {
const id = setTimeout(taskFn, delay);
return () => clearTimeout(id);
},
/**
* Schedule a callback to be called before the next render.
* (If `window.requestAnimationFrame()` is not available, use `scheduler.schedule()` instead.)
*
* Returns a function that when executed will cancel the scheduled function.
*/
scheduleBeforeRender(taskFn) {
// TODO(gkalpak): Implement a better way of accessing `requestAnimationFrame()`
// (e.g. accounting for vendor prefix, SSR-compatibility, etc).
if (typeof window === 'undefined') {
// For SSR just schedule immediately.
return scheduler.schedule(taskFn, 0);
}
if (typeof window.requestAnimationFrame === 'undefined') {
const frameMs = 16;
return scheduler.schedule(taskFn, frameMs);
}
const id = window.requestAnimationFrame(taskFn);
return () => window.cancelAnimationFrame(id);
},
};
/**
* Convert a camelCased string to kebab-cased.
*/
export function camelToDashCase(input) {
return input.replace(/[A-Z]/g, char => `-${char.toLowerCase()}`);
}
/**
* Check whether the input is an `Element`.
*/
export function isElement(node) {
return !!node && node.nodeType === Node.ELEMENT_NODE;
}
/**
* Check whether the input is a function.
*/
export function isFunction(value) {
return typeof value === 'function';
}
/**
* Convert a kebab-cased string to camelCased.
*/
export function kebabToCamelCase(input) {
return input.replace(/-([a-z\d])/g, (_, char) => char.toUpperCase());
}
let _matches;
/**
* Check whether an `Element` matches a CSS selector.
* NOTE: this is duplicated from @angular/upgrade, and can
* be consolidated in the future
*/
export function matchesSelector(el, selector) {
if (!_matches) {
const elProto = Element.prototype;
_matches = elProto.matches || elProto.matchesSelector || elProto.mozMatchesSelector ||
elProto.msMatchesSelector || elProto.oMatchesSelector || elProto.webkitMatchesSelector;
}
return el.nodeType === Node.ELEMENT_NODE ? _matches.call(el, selector) : false;
}
/**
* Test two values for strict equality, accounting for the fact that `NaN !== NaN`.
*/
export function strictEquals(value1, value2) {
return value1 === value2 || (value1 !== value1 && value2 !== value2);
}
/** Gets a map of default set of attributes to observe and the properties they affect. */
export function getDefaultAttributeToPropertyInputs(inputs) {
const attributeToPropertyInputs = {};
inputs.forEach(({ propName, templateName, transform }) => {
attributeToPropertyInputs[camelToDashCase(templateName)] = [propName, transform];
});
return attributeToPropertyInputs;
}
/**
* Gets a component's set of inputs. Uses the injector to get the component factory where the inputs
* are defined.
*/
export function getComponentInputs(component, injector) {
const componentFactoryResolver = injector.get(ComponentFactoryResolver);
const componentFactory = componentFactoryResolver.resolveComponentFactory(component);
return componentFactory.inputs;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nimport {ComponentFactoryResolver, Injector, Type} from '@angular/core';\n\n/**\n * Provide methods for scheduling the execution of a callback.\n */\nexport const scheduler = {\n  /**\n   * Schedule a callback to be called after some delay.\n   *\n   * Returns a function that when executed will cancel the scheduled function.\n   */\n  schedule(taskFn: () => void, delay: number): () => void {\n    const id = setTimeout(taskFn, delay);\n    return () => clearTimeout(id);\n  },\n\n  /**\n   * Schedule a callback to be called before the next render.\n   * (If `window.requestAnimationFrame()` is not available, use `scheduler.schedule()` instead.)\n   *\n   * Returns a function that when executed will cancel the scheduled function.\n   */\n  scheduleBeforeRender(taskFn: () => void): () => void {\n    // TODO(gkalpak): Implement a better way of accessing `requestAnimationFrame()`\n    //                (e.g. accounting for vendor prefix, SSR-compatibility, etc).\n    if (typeof window === 'undefined') {\n      // For SSR just schedule immediately.\n      return scheduler.schedule(taskFn, 0);\n    }\n\n    if (typeof window.requestAnimationFrame === 'undefined') {\n      const frameMs = 16;\n      return scheduler.schedule(taskFn, frameMs);\n    }\n\n    const id = window.requestAnimationFrame(taskFn);\n    return () => window.cancelAnimationFrame(id);\n  },\n};\n\n/**\n * Convert a camelCased string to kebab-cased.\n */\nexport function camelToDashCase(input: string): string {\n  return input.replace(/[A-Z]/g, char => `-${char.toLowerCase()}`);\n}\n\n/**\n * Check whether the input is an `Element`.\n */\nexport function isElement(node: Node|null): node is Element {\n  return !!node && node.nodeType === Node.ELEMENT_NODE;\n}\n\n/**\n * Check whether the input is a function.\n */\nexport function isFunction(value: any): value is Function {\n  return typeof value === 'function';\n}\n\n/**\n * Convert a kebab-cased string to camelCased.\n */\nexport function kebabToCamelCase(input: string): string {\n  return input.replace(/-([a-z\\d])/g, (_, char) => char.toUpperCase());\n}\n\nlet _matches: (this: any, selector: string) => boolean;\n\n/**\n * Check whether an `Element` matches a CSS selector.\n * NOTE: this is duplicated from @angular/upgrade, and can\n * be consolidated in the future\n */\nexport function matchesSelector(el: any, selector: string): boolean {\n  if (!_matches) {\n    const elProto = <any>Element.prototype;\n    _matches = elProto.matches || elProto.matchesSelector || elProto.mozMatchesSelector ||\n        elProto.msMatchesSelector || elProto.oMatchesSelector || elProto.webkitMatchesSelector;\n  }\n  return el.nodeType === Node.ELEMENT_NODE ? _matches.call(el, selector) : false;\n}\n\n/**\n * Test two values for strict equality, accounting for the fact that `NaN !== NaN`.\n */\nexport function strictEquals(value1: any, value2: any): boolean {\n  return value1 === value2 || (value1 !== value1 && value2 !== value2);\n}\n\n/** Gets a map of default set of attributes to observe and the properties they affect. */\nexport function getDefaultAttributeToPropertyInputs(\n    inputs: {propName: string, templateName: string, transform?: (value: any) => any}[]) {\n  const attributeToPropertyInputs:\n      {[key: string]: [propName: string, transform: ((value: any) => any)|undefined]} = {};\n  inputs.forEach(({propName, templateName, transform}) => {\n    attributeToPropertyInputs[camelToDashCase(templateName)] = [propName, transform];\n  });\n\n  return attributeToPropertyInputs;\n}\n\n/**\n * Gets a component's set of inputs. Uses the injector to get the component factory where the inputs\n * are defined.\n */\nexport function getComponentInputs(component: Type<any>, injector: Injector): {\n  propName: string,\n  templateName: string,\n  transform?: (value: any) => any,\n}[] {\n  const componentFactoryResolver = injector.get(ComponentFactoryResolver);\n  const componentFactory = componentFactoryResolver.resolveComponentFactory(component);\n  return componentFactory.inputs;\n}\n"]}