forked from tornado-packages/archive-monorepo
50 lines
1.8 KiB
TypeScript
50 lines
1.8 KiB
TypeScript
|
import { ProgressEvent } from './progress-event';
|
||
|
|
||
|
export type ProgressEventListener = (event: ProgressEvent) => void;
|
||
|
export type ProgressEventListenerObject = {handleEvent(event: ProgressEvent): void};
|
||
|
export type ProgressEventListenerOrEventListenerObject = ProgressEventListener | ProgressEventListenerObject;
|
||
|
|
||
|
export class XMLHttpRequestEventTarget {
|
||
|
onloadstart: ProgressEventListener | null;
|
||
|
onprogress: ProgressEventListener | null;
|
||
|
onabort: ProgressEventListener | null;
|
||
|
onerror: ProgressEventListener | null;
|
||
|
onload: ProgressEventListener | null;
|
||
|
ontimeout: ProgressEventListener | null;
|
||
|
onloadend: ProgressEventListener | null;
|
||
|
|
||
|
private listeners: {[eventType: string]: ProgressEventListener[]} = {};
|
||
|
|
||
|
addEventListener(eventType: string, listener?: ProgressEventListenerOrEventListenerObject) {
|
||
|
eventType = eventType.toLowerCase();
|
||
|
this.listeners[eventType] = this.listeners[eventType] || [];
|
||
|
this.listeners[eventType].push((listener as ProgressEventListenerObject).handleEvent || (listener as ProgressEventListener));
|
||
|
}
|
||
|
removeEventListener(eventType: string, listener?: ProgressEventListenerOrEventListenerObject) {
|
||
|
eventType = eventType.toLowerCase();
|
||
|
if (!this.listeners[eventType]) { return; }
|
||
|
|
||
|
const index = this.listeners[eventType].indexOf((listener as ProgressEventListenerObject).handleEvent || (listener as ProgressEventListener));
|
||
|
if (index < 0) { return; }
|
||
|
|
||
|
this.listeners[eventType].splice(index, 1);
|
||
|
}
|
||
|
dispatchEvent(event: ProgressEvent) {
|
||
|
const eventType = event.type.toLowerCase();
|
||
|
event.target = this; // TODO: set event.currentTarget?
|
||
|
|
||
|
if (this.listeners[eventType]) {
|
||
|
for (let listener of this.listeners[eventType]) {
|
||
|
listener.call(this, event);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
const listener = this[`on${eventType}`];
|
||
|
if (listener) {
|
||
|
listener.call(this, event);
|
||
|
}
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
}
|