40 lines
1.4 KiB
TypeScript
40 lines
1.4 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import { Event as BaseEvent, Emitter } from 'vs/base/common/event';
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export type EventHandler = HTMLElement | HTMLDocument | Window;
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export interface IDomEvent {
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<K extends keyof HTMLElementEventMap>(element: EventHandler, type: K, useCapture?: boolean): BaseEvent<HTMLElementEventMap[K]>;
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(element: EventHandler, type: string, useCapture?: boolean): BaseEvent<any>;
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}
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export const domEvent: IDomEvent = (element: EventHandler, type: string, useCapture?: boolean) => {
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const fn = (e: Event) => emitter.fire(e);
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const emitter = new Emitter<Event>({
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onFirstListenerAdd: () => {
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element.addEventListener(type, fn, useCapture);
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},
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onLastListenerRemove: () => {
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element.removeEventListener(type, fn, useCapture);
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}
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});
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return emitter.event;
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};
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export interface CancellableEvent {
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preventDefault(): void;
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stopPropagation(): void;
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}
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export function stop<T extends CancellableEvent>(event: BaseEvent<T>): BaseEvent<T> {
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return BaseEvent.map(event, e => {
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e.preventDefault();
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e.stopPropagation();
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return e;
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});
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} |