27 lines
743 B
TypeScript
27 lines
743 B
TypeScript
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export type ProgressCallback = (progress: number) => any;
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export class PromiseProgress<T> extends Promise<T> {
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private listeners: ProgressCallback[] = [];
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private _progress = 0;
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get progress() { return this._progress; }
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set progress(p: number) {
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if(p == this._progress) return;
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this._progress = p;
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this.listeners.forEach(l => l(p));
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}
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constructor(executor: (resolve: (value: T) => any, reject: (reason: any) => void, progress: (progress: number) => any) => void) {
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super((resolve, reject) => executor(
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(value: T) => resolve(value),
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(reason: any) => reject(reason),
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(progress: number) => this.progress = progress
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));
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}
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onProgress(callback: ProgressCallback) {
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this.listeners.push(callback);
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return this;
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}
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}
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