@angular/core
Version:
Angular - the core framework
128 lines • 19.7 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 { ActionResolver } from './action_resolver';
import { Dispatcher } from './dispatcher';
import { Restriction } from './restriction';
/** An internal symbol used to indicate whether propagation should be stopped or not. */
export const PROPAGATION_STOPPED_SYMBOL = Symbol.for('propagationStopped');
/** Extra event phases beyond what the browser provides. */
export const EventPhase = {
REPLAY: 101,
};
const PREVENT_DEFAULT_ERROR_MESSAGE_DETAILS = ' Because event replay occurs after browser dispatch, `preventDefault` would have no ' +
'effect. You can check whether an event is being replayed by accessing the event phase: ' +
'`event.eventPhase === EventPhase.REPLAY`.';
const PREVENT_DEFAULT_ERROR_MESSAGE = `\`preventDefault\` called during event replay.`;
const COMPOSED_PATH_ERROR_MESSAGE_DETAILS = ' Because event replay occurs after browser ' +
'dispatch, `composedPath()` will be empty. Iterate parent nodes from `event.target` or ' +
'`event.currentTarget` if you need to check elements in the event path.';
const COMPOSED_PATH_ERROR_MESSAGE = `\`composedPath\` called during event replay.`;
/**
* A dispatcher that uses browser-based `Event` semantics, for example bubbling, `stopPropagation`,
* `currentTarget`, etc.
*/
export class EventDispatcher {
constructor(dispatchDelegate) {
this.dispatchDelegate = dispatchDelegate;
this.actionResolver = new ActionResolver();
this.dispatcher = new Dispatcher((eventInfoWrapper) => {
this.dispatchToDelegate(eventInfoWrapper);
}, {
actionResolver: this.actionResolver,
});
}
/**
* The entrypoint for the `EventContract` dispatch.
*/
dispatch(eventInfo) {
this.dispatcher.dispatch(eventInfo);
}
/** Internal method that does basic disaptching. */
dispatchToDelegate(eventInfoWrapper) {
if (eventInfoWrapper.getIsReplay()) {
prepareEventForReplay(eventInfoWrapper);
}
prepareEventForBubbling(eventInfoWrapper);
while (eventInfoWrapper.getAction()) {
prepareEventForDispatch(eventInfoWrapper);
this.dispatchDelegate(eventInfoWrapper.getEvent(), eventInfoWrapper.getAction().name);
if (propagationStopped(eventInfoWrapper)) {
return;
}
this.actionResolver.resolveParentAction(eventInfoWrapper.eventInfo);
}
}
}
function prepareEventForBubbling(eventInfoWrapper) {
const event = eventInfoWrapper.getEvent();
const stopPropagation = () => {
event[PROPAGATION_STOPPED_SYMBOL] = true;
};
patchEventInstance(event, 'stopPropagation', stopPropagation);
patchEventInstance(event, 'stopImmediatePropagation', stopPropagation);
}
function propagationStopped(eventInfoWrapper) {
const event = eventInfoWrapper.getEvent();
return !!event[PROPAGATION_STOPPED_SYMBOL];
}
function prepareEventForReplay(eventInfoWrapper) {
const event = eventInfoWrapper.getEvent();
const target = eventInfoWrapper.getTargetElement();
patchEventInstance(event, 'target', target);
patchEventInstance(event, 'eventPhase', EventPhase.REPLAY);
patchEventInstance(event, 'preventDefault', () => {
throw new Error(PREVENT_DEFAULT_ERROR_MESSAGE + (ngDevMode ? PREVENT_DEFAULT_ERROR_MESSAGE_DETAILS : ''));
});
patchEventInstance(event, 'composedPath', () => {
throw new Error(COMPOSED_PATH_ERROR_MESSAGE + (ngDevMode ? COMPOSED_PATH_ERROR_MESSAGE_DETAILS : ''));
});
}
function prepareEventForDispatch(eventInfoWrapper) {
const event = eventInfoWrapper.getEvent();
const currentTarget = eventInfoWrapper.getAction()?.element;
if (currentTarget) {
patchEventInstance(event, 'currentTarget', currentTarget, {
// `currentTarget` is going to get reassigned every dispatch.
configurable: true,
});
}
}
/**
* Patch `Event` instance during non-standard `Event` dispatch. This patches just the `Event`
* instance that the browser created, it does not patch global properties or methods.
*
* This is necessary because dispatching an `Event` outside of browser dispatch results in
* incorrect properties and methods that need to be polyfilled or do not work.
*
* JSAction dispatch adds two extra "phases" to event dispatch:
* 1. Event delegation - the event is being dispatched by a delegating event handler on a container
* (typically `window.document.documentElement`), to a delegated event handler on some child
* element. Certain `Event` properties will be unintuitive, such as `currentTarget`, which would
* be the container rather than the child element. Bubbling would also not work. In order to
* emulate the browser, these properties and methods on the `Event` are patched.
* 2. Event replay - the event is being dispatched by the framework once the handlers have been
* loaded (during hydration, or late-loaded). Certain `Event` properties can be unset by the
* browser because the `Event` is no longer actively being dispatched, such as `target`. Other
* methods have no effect because the `Event` has already been dispatched, such as
* `preventDefault`. Bubbling would also not work. These properties and methods are patched,
* either to fill in information that the browser may have removed, or to throw errors in methods
* that no longer behave as expected.
*/
function patchEventInstance(event, property, value, { configurable = false } = {}) {
Object.defineProperty(event, property, { value, configurable });
}
/**
* Registers deferred functionality for an EventContract and a Jsaction
* Dispatcher.
*/
export function registerDispatcher(eventContract, dispatcher) {
eventContract.ecrd((eventInfo) => {
dispatcher.dispatch(eventInfo);
}, Restriction.I_AM_THE_JSACTION_FRAMEWORK);
}
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You can check whether an event is being replayed by accessing the event phase: ' +\n  '`event.eventPhase === EventPhase.REPLAY`.';\nconst PREVENT_DEFAULT_ERROR_MESSAGE = `\\`preventDefault\\` called during event replay.`;\nconst COMPOSED_PATH_ERROR_MESSAGE_DETAILS =\n  ' Because event replay occurs after browser ' +\n  'dispatch, `composedPath()` will be empty. Iterate parent nodes from `event.target` or ' +\n  '`event.currentTarget` if you need to check elements in the event path.';\nconst COMPOSED_PATH_ERROR_MESSAGE = `\\`composedPath\\` called during event replay.`;\n\ndeclare global {\n  interface Event {\n    [PROPAGATION_STOPPED_SYMBOL]?: boolean;\n  }\n}\n\n/**\n * A dispatcher that uses browser-based `Event` semantics, for example bubbling, `stopPropagation`,\n * `currentTarget`, etc.\n */\nexport class EventDispatcher {\n  private readonly actionResolver: ActionResolver;\n\n  private readonly dispatcher: Dispatcher;\n\n  constructor(private readonly dispatchDelegate: (event: Event, actionName: string) => void) {\n    this.actionResolver = new ActionResolver();\n    this.dispatcher = new Dispatcher(\n      (eventInfoWrapper: EventInfoWrapper) => {\n        this.dispatchToDelegate(eventInfoWrapper);\n      },\n      {\n        actionResolver: this.actionResolver,\n      },\n    );\n  }\n\n  /**\n   * The entrypoint for the `EventContract` dispatch.\n   */\n  dispatch(eventInfo: EventInfo): void {\n    this.dispatcher.dispatch(eventInfo);\n  }\n\n  /** Internal method that does basic disaptching. */\n  private dispatchToDelegate(eventInfoWrapper: EventInfoWrapper) {\n    if (eventInfoWrapper.getIsReplay()) {\n      prepareEventForReplay(eventInfoWrapper);\n    }\n    prepareEventForBubbling(eventInfoWrapper);\n    while (eventInfoWrapper.getAction()) {\n      prepareEventForDispatch(eventInfoWrapper);\n      this.dispatchDelegate(eventInfoWrapper.getEvent(), eventInfoWrapper.getAction()!.name);\n      if (propagationStopped(eventInfoWrapper)) {\n        return;\n      }\n      this.actionResolver.resolveParentAction(eventInfoWrapper.eventInfo);\n    }\n  }\n}\n\nfunction prepareEventForBubbling(eventInfoWrapper: EventInfoWrapper) {\n  const event = eventInfoWrapper.getEvent();\n  const stopPropagation = () => {\n    event[PROPAGATION_STOPPED_SYMBOL] = true;\n  };\n  patchEventInstance(event, 'stopPropagation', stopPropagation);\n  patchEventInstance(event, 'stopImmediatePropagation', stopPropagation);\n}\n\nfunction propagationStopped(eventInfoWrapper: EventInfoWrapper) {\n  const event = eventInfoWrapper.getEvent();\n  return !!event[PROPAGATION_STOPPED_SYMBOL];\n}\n\nfunction prepareEventForReplay(eventInfoWrapper: EventInfoWrapper) {\n  const event = eventInfoWrapper.getEvent();\n  const target = eventInfoWrapper.getTargetElement();\n  patchEventInstance(event, 'target', target);\n  patchEventInstance(event, 'eventPhase', EventPhase.REPLAY);\n  patchEventInstance(event, 'preventDefault', () => {\n    throw new Error(\n      PREVENT_DEFAULT_ERROR_MESSAGE + (ngDevMode ? PREVENT_DEFAULT_ERROR_MESSAGE_DETAILS : ''),\n    );\n  });\n  patchEventInstance(event, 'composedPath', () => {\n    throw new Error(\n      COMPOSED_PATH_ERROR_MESSAGE + (ngDevMode ? COMPOSED_PATH_ERROR_MESSAGE_DETAILS : ''),\n    );\n  });\n}\n\nfunction prepareEventForDispatch(eventInfoWrapper: EventInfoWrapper) {\n  const event = eventInfoWrapper.getEvent();\n  const currentTarget = eventInfoWrapper.getAction()?.element;\n  if (currentTarget) {\n    patchEventInstance(event, 'currentTarget', currentTarget, {\n      // `currentTarget` is going to get reassigned every dispatch.\n      configurable: true,\n    });\n  }\n}\n\n/**\n * Patch `Event` instance during non-standard `Event` dispatch. This patches just the `Event`\n * instance that the browser created, it does not patch global properties or methods.\n *\n * This is necessary because dispatching an `Event` outside of browser dispatch results in\n * incorrect properties and methods that need to be polyfilled or do not work.\n *\n * JSAction dispatch adds two extra \"phases\" to event dispatch:\n * 1. Event delegation - the event is being dispatched by a delegating event handler on a container\n *    (typically `window.document.documentElement`), to a delegated event handler on some child\n *    element. Certain `Event` properties will be unintuitive, such as `currentTarget`, which would\n *    be the container rather than the child element. Bubbling would also not work. In order to\n *    emulate the browser, these properties and methods on the `Event` are patched.\n * 2. Event replay - the event is being dispatched by the framework once the handlers have been\n *    loaded (during hydration, or late-loaded). Certain `Event` properties can be unset by the\n *    browser because the `Event` is no longer actively being dispatched, such as `target`. Other\n *    methods have no effect because the `Event` has already been dispatched, such as\n *    `preventDefault`. Bubbling would also not work. These properties and methods are patched,\n *    either to fill in information that the browser may have removed, or to throw errors in methods\n *    that no longer behave as expected.\n */\nfunction patchEventInstance<T>(\n  event: Event,\n  property: string,\n  value: T,\n  {configurable = false}: {configurable?: boolean} = {},\n) {\n  Object.defineProperty(event, property, {value, configurable});\n}\n\n/**\n * Registers deferred functionality for an EventContract and a Jsaction\n * Dispatcher.\n */\nexport function registerDispatcher(\n  eventContract: UnrenamedEventContract,\n  dispatcher: EventDispatcher,\n) {\n  eventContract.ecrd((eventInfo: EventInfo) => {\n    dispatcher.dispatch(eventInfo);\n  }, Restriction.I_AM_THE_JSACTION_FRAMEWORK);\n}\n"]}