devextreme-angular
Version:
Angular UI and visualization components based on DevExtreme widgets
106 lines • 12.5 kB
JavaScript
/*!
* devextreme-angular
* Version: 25.1.3
* Build date: Wed Jun 25 2025
*
* Copyright (c) 2012 - 2025 Developer Express Inc. ALL RIGHTS RESERVED
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file in the root of the project for details.
*
* https://github.com/DevExpress/devextreme-angular
*/
import { EventEmitter } from '@angular/core';
export class NgEventsStrategy {
instance;
zone;
subscriptions = {};
events = {};
constructor(instance, zone) {
this.instance = instance;
this.zone = zone;
}
hasEvent(name) {
return this.getEmitter(name).observers.length !== 0;
}
fireEvent(name, args) {
const emitter = this.getEmitter(name);
if (emitter.observers.length) {
const internalSubs = this.subscriptions[name] || [];
if (internalSubs.length === emitter.observers.length) {
emitter.next(args?.[0]);
}
else {
this.zone.run(() => emitter.next(args?.[0]));
}
}
}
on(name, handler) {
if (typeof name === 'string') {
const eventSubscriptions = this.subscriptions[name] || [];
const subcription = this.getEmitter(name).subscribe(handler?.bind(this.instance));
const unsubscribe = subcription.unsubscribe.bind(subcription);
eventSubscriptions.push({ handler, unsubscribe });
this.subscriptions[name] = eventSubscriptions;
}
else {
const handlersObj = name;
Object.keys(handlersObj).forEach((event) => this.on(event, handlersObj[event]));
}
}
off(name, handler) {
const eventSubscriptions = this.subscriptions[name] || [];
if (handler) {
eventSubscriptions.some((subscription, i) => {
if (subscription.handler === handler) {
subscription.unsubscribe();
eventSubscriptions.splice(i, 1);
return true;
}
return false;
});
}
else {
eventSubscriptions.forEach((subscription) => {
subscription.unsubscribe();
});
eventSubscriptions.splice(0, eventSubscriptions.length);
}
}
dispose() { }
addEmitter(eventName, emitter) {
this.events[eventName] = emitter;
}
getEmitter(eventName) {
if (!this.events[eventName]) {
this.events[eventName] = new EventEmitter();
}
return this.events[eventName];
}
}
export class EmitterHelper {
zone;
component;
lockedValueChangeEvent = false;
constructor(zone, component) {
this.zone = zone;
this.component = component;
}
fireNgEvent(eventName, eventArgs) {
if (this.lockedValueChangeEvent && eventName === 'valueChange') {
return;
}
const emitter = this.component[eventName];
if (emitter?.observers.length) {
this.zone.run(() => {
emitter.next(eventArgs?.[0]);
});
}
}
createEmitters(events) {
events.forEach((event) => {
this.component[event.emit] = new EventEmitter();
});
}
}
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ALL RIGHTS RESERVED\n *\n * This software may be modified and distributed under the terms\n * of the MIT license. See the LICENSE file in the root of the project for details.\n *\n * https://github.com/DevExpress/devextreme-angular\n */\n\nimport { EventEmitter, NgZone } from '@angular/core';\r\nimport { DxComponent } from './component';\r\n\r\ninterface IEventSubscription {\r\n  handler: any;\r\n  unsubscribe: () => void;\r\n}\r\nexport class NgEventsStrategy {\r\n  private subscriptions: { [key: string]: IEventSubscription[] } = {};\r\n\r\n  private events: { [key: string]: EventEmitter<any> } = {};\r\n\r\n  constructor(private readonly instance: any, private readonly zone: NgZone) { }\r\n\r\n  hasEvent(name: string) {\r\n    return this.getEmitter(name).observers.length !== 0;\r\n  }\r\n\r\n  fireEvent(name, args) {\r\n    const emitter = this.getEmitter(name);\r\n    if (emitter.observers.length) {\r\n      const internalSubs = this.subscriptions[name] || [];\r\n      if (internalSubs.length === emitter.observers.length) {\r\n        emitter.next(args?.[0]);\r\n      } else {\r\n        this.zone.run(() => emitter.next(args?.[0]));\r\n      }\r\n    }\r\n  }\r\n\r\n  on(name: string | object, handler?: Function) {\r\n    if (typeof name === 'string') {\r\n      const eventSubscriptions = this.subscriptions[name] || [];\r\n      const subcription = this.getEmitter(name).subscribe(handler?.bind(this.instance));\r\n      const unsubscribe = subcription.unsubscribe.bind(subcription);\r\n\r\n      eventSubscriptions.push({ handler, unsubscribe });\r\n      this.subscriptions[name] = eventSubscriptions;\r\n    } else {\r\n      const handlersObj = name;\r\n\r\n      Object.keys(handlersObj).forEach((event) => this.on(event, handlersObj[event]));\r\n    }\r\n  }\r\n\r\n  off(name, handler) {\r\n    const eventSubscriptions = this.subscriptions[name] || [];\r\n\r\n    if (handler) {\r\n      eventSubscriptions.some((subscription, i) => {\r\n        if (subscription.handler === handler) {\r\n          subscription.unsubscribe();\r\n          eventSubscriptions.splice(i, 1);\r\n          return true;\r\n        }\r\n        return false;\r\n      });\r\n    } else {\r\n      eventSubscriptions.forEach((subscription) => {\r\n        subscription.unsubscribe();\r\n      });\r\n      eventSubscriptions.splice(0, eventSubscriptions.length);\r\n    }\r\n  }\r\n\r\n  dispose() {}\r\n\r\n  public addEmitter(eventName: string, emitter: EventEmitter<any>) {\r\n    this.events[eventName] = emitter;\r\n  }\r\n\r\n  private getEmitter(eventName: string): EventEmitter<any> {\r\n    if (!this.events[eventName]) {\r\n      this.events[eventName] = new EventEmitter();\r\n    }\r\n    return this.events[eventName];\r\n  }\r\n}\r\n\r\nexport class EmitterHelper {\r\n  lockedValueChangeEvent = false;\r\n\r\n  constructor(private readonly zone: NgZone, private component: DxComponent) { }\r\n\r\n  fireNgEvent(eventName: string, eventArgs: any) {\r\n    if (this.lockedValueChangeEvent && eventName === 'valueChange') {\r\n      return;\r\n    }\r\n    const emitter = this.component[eventName];\r\n    if (emitter?.observers.length) {\r\n      this.zone.run(() => {\r\n        emitter.next(eventArgs?.[0]);\r\n      });\r\n    }\r\n  }\r\n\r\n  createEmitters(events: any[]) {\r\n    events.forEach((event) => {\r\n      this.component[event.emit] = new EventEmitter();\r\n    });\r\n  }\r\n}\r\n"]}