devextreme-angular
Version:
Angular UI and visualization components based on DevExtreme widgets
97 lines • 12.6 kB
JavaScript
/*!
* devextreme-angular
* Version: 20.2.5
* Build date: Fri Jan 15 2021
*
* Copyright (c) 2012 - 2021 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 {
constructor(instance, zone) {
this.instance = instance;
this.zone = zone;
this.subscriptions = {};
this.events = {};
}
hasEvent(name) {
return this.getEmitter(name).observers.length !== 0;
}
fireEvent(name, args) {
let emitter = this.getEmitter(name);
if (emitter.observers.length) {
const internalSubs = this.subscriptions[name] || [];
if (internalSubs.length === emitter.observers.length)
emitter.next(args && args[0]);
else
this.zone.run(() => emitter.next(args && args[0]));
}
}
on(name, handler) {
if (typeof name === 'string') {
let eventSubscriptions = this.subscriptions[name] || [], subcription = this.getEmitter(name).subscribe(handler.bind(this.instance)), unsubscribe = subcription.unsubscribe.bind(subcription);
eventSubscriptions.push({ handler, unsubscribe });
this.subscriptions[name] = eventSubscriptions;
}
else {
let handlersObj = name;
Object.keys(handlersObj).forEach(event => this.on(event, handlersObj[event]));
}
}
off(name, handler) {
let eventSubscriptions = this.subscriptions[name] || [];
if (handler) {
eventSubscriptions.some((subscription, i) => {
if (subscription.handler === handler) {
subscription.unsubscribe();
eventSubscriptions.splice(i, 1);
return true;
}
});
}
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 {
constructor(zone, component) {
this.zone = zone;
this.component = component;
this.lockedValueChangeEvent = false;
}
fireNgEvent(eventName, eventArgs) {
if (this.lockedValueChangeEvent && eventName === 'valueChange') {
return;
}
let emitter = this.component[eventName];
if (emitter && emitter.observers.length) {
this.zone.run(() => {
emitter.next(eventArgs && 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    private events: { [key: string]: EventEmitter<any> } = {};\r\n\r\n    constructor(private instance: any, private 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        let 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 && args[0]);\r\n            else\r\n                this.zone.run(() => emitter.next(args && args[0]));\r\n        }\r\n    }\r\n\r\n    on(name: string | Object, handler?: Function) {\r\n        if (typeof name === 'string') {\r\n            let eventSubscriptions = this.subscriptions[name] || [],\r\n                subcription = this.getEmitter(name).subscribe(handler.bind(this.instance)),\r\n                unsubscribe = subcription.unsubscribe.bind(subcription);\r\n\r\n            eventSubscriptions.push({ handler, unsubscribe });\r\n            this.subscriptions[name] = eventSubscriptions;\r\n        } else {\r\n            let 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        let 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            });\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 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        let emitter = this.component[eventName];\r\n        if (emitter && emitter.observers.length) {\r\n            this.zone.run(() => {\r\n                emitter.next(eventArgs && 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\r\n"]}