/** * @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 { DOCUMENT, ɵgetDOM as getDOM } from '@angular/common'; import { Inject, Injectable } from '@angular/core'; import { EventManagerPlugin } from './event_manager'; import * as i0 from "@angular/core"; /** * Defines supported modifiers for key events. */ const MODIFIER_KEYS = ['alt', 'control', 'meta', 'shift']; // The following values are here for cross-browser compatibility and to match the W3C standard // cf https://www.w3.org/TR/DOM-Level-3-Events-key/ const _keyMap = { '\b': 'Backspace', '\t': 'Tab', '\x7F': 'Delete', '\x1B': 'Escape', 'Del': 'Delete', 'Esc': 'Escape', 'Left': 'ArrowLeft', 'Right': 'ArrowRight', 'Up': 'ArrowUp', 'Down': 'ArrowDown', 'Menu': 'ContextMenu', 'Scroll': 'ScrollLock', 'Win': 'OS' }; /** * Retrieves modifiers from key-event objects. */ const MODIFIER_KEY_GETTERS = { 'alt': (event) => event.altKey, 'control': (event) => event.ctrlKey, 'meta': (event) => event.metaKey, 'shift': (event) => event.shiftKey }; /** * @publicApi * A browser plug-in that provides support for handling of key events in Angular. */ export class KeyEventsPlugin extends EventManagerPlugin { /** * Initializes an instance of the browser plug-in. * @param doc The document in which key events will be detected. */ constructor(doc) { super(doc); } /** * Reports whether a named key event is supported. * @param eventName The event name to query. * @return True if the named key event is supported. */ supports(eventName) { return KeyEventsPlugin.parseEventName(eventName) != null; } /** * Registers a handler for a specific element and key event. * @param element The HTML element to receive event notifications. * @param eventName The name of the key event to listen for. * @param handler A function to call when the notification occurs. Receives the * event object as an argument. * @returns The key event that was registered. */ addEventListener(element, eventName, handler) { const parsedEvent = KeyEventsPlugin.parseEventName(eventName); const outsideHandler = KeyEventsPlugin.eventCallback(parsedEvent['fullKey'], handler, this.manager.getZone()); return this.manager.getZone().runOutsideAngular(() => { return getDOM().onAndCancel(element, parsedEvent['domEventName'], outsideHandler); }); } /** * Parses the user provided full keyboard event definition and normalizes it for * later internal use. It ensures the string is all lowercase, converts special * characters to a standard spelling, and orders all the values consistently. * * @param eventName The name of the key event to listen for. * @returns an object with the full, normalized string, and the dom event name * or null in the case when the event doesn't match a keyboard event. */ static parseEventName(eventName) { const parts = eventName.toLowerCase().split('.'); const domEventName = parts.shift(); if ((parts.length === 0) || !(domEventName === 'keydown' || domEventName === 'keyup')) { return null; } const key = KeyEventsPlugin._normalizeKey(parts.pop()); let fullKey = ''; let codeIX = parts.indexOf('code'); if (codeIX > -1) { parts.splice(codeIX, 1); fullKey = 'code.'; } MODIFIER_KEYS.forEach(modifierName => { const index = parts.indexOf(modifierName); if (index > -1) { parts.splice(index, 1); fullKey += modifierName + '.'; } }); fullKey += key; if (parts.length != 0 || key.length === 0) { // returning null instead of throwing to let another plugin process the event return null; } // NOTE: Please don't rewrite this as so, as it will break JSCompiler property renaming. // The code must remain in the `result['domEventName']` form. // return {domEventName, fullKey}; const result = {}; result['domEventName'] = domEventName; result['fullKey'] = fullKey; return result; } /** * Determines whether the actual keys pressed match the configured key code string. * The `fullKeyCode` event is normalized in the `parseEventName` method when the * event is attached to the DOM during the `addEventListener` call. This is unseen * by the end user and is normalized for internal consistency and parsing. * * @param event The keyboard event. * @param fullKeyCode The normalized user defined expected key event string * @returns boolean. */ static matchEventFullKeyCode(event, fullKeyCode) { let keycode = _keyMap[event.key] || event.key; let key = ''; if (fullKeyCode.indexOf('code.') > -1) { keycode = event.code; key = 'code.'; } // the keycode could be unidentified so we have to check here if (keycode == null || !keycode) return false; keycode = keycode.toLowerCase(); if (keycode === ' ') { keycode = 'space'; // for readability } else if (keycode === '.') { keycode = 'dot'; // because '.' is used as a separator in event names } MODIFIER_KEYS.forEach(modifierName => { if (modifierName !== keycode) { const modifierGetter = MODIFIER_KEY_GETTERS[modifierName]; if (modifierGetter(event)) { key += modifierName + '.'; } } }); key += keycode; return key === fullKeyCode; } /** * Configures a handler callback for a key event. * @param fullKey The event name that combines all simultaneous keystrokes. * @param handler The function that responds to the key event. * @param zone The zone in which the event occurred. * @returns A callback function. */ static eventCallback(fullKey, handler, zone) { return (event) => { if (KeyEventsPlugin.matchEventFullKeyCode(event, fullKey)) { zone.runGuarded(() => handler(event)); } }; } /** @internal */ static _normalizeKey(keyName) { // TODO: switch to a Map if the mapping grows too much switch (keyName) { case 'esc': return 'escape'; default: return keyName; } } } KeyEventsPlugin.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: KeyEventsPlugin, deps: [{ token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable }); KeyEventsPlugin.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: KeyEventsPlugin }); i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: KeyEventsPlugin, decorators: [{ type: Injectable }], ctorParameters: function () { return [{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT] }] }]; } }); //# 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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 */\n\nimport {DOCUMENT, ɵgetDOM as getDOM} from '@angular/common';\nimport {Inject, Injectable, NgZone} from '@angular/core';\n\nimport {EventManagerPlugin} from './event_manager';\n\n/**\n * Defines supported modifiers for key events.\n */\nconst MODIFIER_KEYS = ['alt', 'control', 'meta', 'shift'];\n\n// The following values are here for cross-browser compatibility and to match the W3C standard\n// cf https://www.w3.org/TR/DOM-Level-3-Events-key/\nconst _keyMap: {[k: string]: string} = {\n  '\\b': 'Backspace',\n  '\\t': 'Tab',\n  '\\x7F': 'Delete',\n  '\\x1B': 'Escape',\n  'Del': 'Delete',\n  'Esc': 'Escape',\n  'Left': 'ArrowLeft',\n  'Right': 'ArrowRight',\n  'Up': 'ArrowUp',\n  'Down': 'ArrowDown',\n  'Menu': 'ContextMenu',\n  'Scroll': 'ScrollLock',\n  'Win': 'OS'\n};\n\n/**\n * Retrieves modifiers from key-event objects.\n */\nconst MODIFIER_KEY_GETTERS: {[key: string]: (event: KeyboardEvent) => boolean} = {\n  'alt': (event: KeyboardEvent) => event.altKey,\n  'control': (event: KeyboardEvent) => event.ctrlKey,\n  'meta': (event: KeyboardEvent) => event.metaKey,\n  'shift': (event: KeyboardEvent) => event.shiftKey\n};\n\n/**\n * @publicApi\n * A browser plug-in that provides support for handling of key events in Angular.\n */\n@Injectable()\nexport class KeyEventsPlugin extends EventManagerPlugin {\n  /**\n   * Initializes an instance of the browser plug-in.\n   * @param doc The document in which key events will be detected.\n   */\n  constructor(@Inject(DOCUMENT) doc: any) {\n    super(doc);\n  }\n\n  /**\n   * Reports whether a named key event is supported.\n   * @param eventName The event name to query.\n   * @return True if the named key event is supported.\n   */\n  override supports(eventName: string): boolean {\n    return KeyEventsPlugin.parseEventName(eventName) != null;\n  }\n\n  /**\n   * Registers a handler for a specific element and key event.\n   * @param element The HTML element to receive event notifications.\n   * @param eventName The name of the key event to listen for.\n   * @param handler A function to call when the notification occurs. Receives the\n   * event object as an argument.\n   * @returns The key event that was registered.\n   */\n  override addEventListener(element: HTMLElement, eventName: string, handler: Function): Function {\n    const parsedEvent = KeyEventsPlugin.parseEventName(eventName)!;\n\n    const outsideHandler =\n        KeyEventsPlugin.eventCallback(parsedEvent['fullKey'], handler, this.manager.getZone());\n\n    return this.manager.getZone().runOutsideAngular(() => {\n      return getDOM().onAndCancel(element, parsedEvent['domEventName'], outsideHandler);\n    });\n  }\n\n  /**\n   * Parses the user provided full keyboard event definition and normalizes it for\n   * later internal use. It ensures the string is all lowercase, converts special\n   * characters to a standard spelling, and orders all the values consistently.\n   *\n   * @param eventName The name of the key event to listen for.\n   * @returns an object with the full, normalized string, and the dom event name\n   * or null in the case when the event doesn't match a keyboard event.\n   */\n  static parseEventName(eventName: string): {fullKey: string, domEventName: string}|null {\n    const parts: string[] = eventName.toLowerCase().split('.');\n\n    const domEventName = parts.shift();\n    if ((parts.length === 0) || !(domEventName === 'keydown' || domEventName === 'keyup')) {\n      return null;\n    }\n\n    const key = KeyEventsPlugin._normalizeKey(parts.pop()!);\n\n    let fullKey = '';\n    let codeIX = parts.indexOf('code');\n    if (codeIX > -1) {\n      parts.splice(codeIX, 1);\n      fullKey = 'code.';\n    }\n    MODIFIER_KEYS.forEach(modifierName => {\n      const index: number = parts.indexOf(modifierName);\n      if (index > -1) {\n        parts.splice(index, 1);\n        fullKey += modifierName + '.';\n      }\n    });\n    fullKey += key;\n\n    if (parts.length != 0 || key.length === 0) {\n      // returning null instead of throwing to let another plugin process the event\n      return null;\n    }\n\n    // NOTE: Please don't rewrite this as so, as it will break JSCompiler property renaming.\n    //       The code must remain in the `result['domEventName']` form.\n    // return {domEventName, fullKey};\n    const result: {fullKey: string, domEventName: string} = {} as any;\n    result['domEventName'] = domEventName;\n    result['fullKey'] = fullKey;\n    return result;\n  }\n\n  /**\n   * Determines whether the actual keys pressed match the configured key code string.\n   * The `fullKeyCode` event is normalized in the `parseEventName` method when the\n   * event is attached to the DOM during the `addEventListener` call. This is unseen\n   * by the end user and is normalized for internal consistency and parsing.\n   *\n   * @param event The keyboard event.\n   * @param fullKeyCode The normalized user defined expected key event string\n   * @returns boolean.\n   */\n  static matchEventFullKeyCode(event: KeyboardEvent, fullKeyCode: string): boolean {\n    let keycode = _keyMap[event.key] || event.key;\n    let key = '';\n    if (fullKeyCode.indexOf('code.') > -1) {\n      keycode = event.code;\n      key = 'code.';\n    }\n    // the keycode could be unidentified so we have to check here\n    if (keycode == null || !keycode) return false;\n    keycode = keycode.toLowerCase();\n    if (keycode === ' ') {\n      keycode = 'space';  // for readability\n    } else if (keycode === '.') {\n      keycode = 'dot';  // because '.' is used as a separator in event names\n    }\n    MODIFIER_KEYS.forEach(modifierName => {\n      if (modifierName !== keycode) {\n        const modifierGetter = MODIFIER_KEY_GETTERS[modifierName];\n        if (modifierGetter(event)) {\n          key += modifierName + '.';\n        }\n      }\n    });\n    key += keycode;\n    return key === fullKeyCode;\n  }\n\n  /**\n   * Configures a handler callback for a key event.\n   * @param fullKey The event name that combines all simultaneous keystrokes.\n   * @param handler The function that responds to the key event.\n   * @param zone The zone in which the event occurred.\n   * @returns A callback function.\n   */\n  static eventCallback(fullKey: string, handler: Function, zone: NgZone): Function {\n    return (event: KeyboardEvent) => {\n      if (KeyEventsPlugin.matchEventFullKeyCode(event, fullKey)) {\n        zone.runGuarded(() => handler(event));\n      }\n    };\n  }\n\n  /** @internal */\n  static _normalizeKey(keyName: string): string {\n    // TODO: switch to a Map if the mapping grows too much\n    switch (keyName) {\n      case 'esc':\n        return 'escape';\n      default:\n        return keyName;\n    }\n  }\n}\n"]}