e-virt-table/dist/lib/EventBus.js

A powerful data table based on canvas. You can use it as data grid、Microsoft Excel or Google sheets. It supports virtual scroll、cell edit etc.

class EventBus {
    constructor() {
        Object.defineProperty(this, "events", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: new Map()
        });
    }
    has(event) {
        return this.events.has(event);
    }
    // 订阅事件
    on(event, callback) {
        const callbacks = this.events.get(event) || [];
        callbacks.push(callback);
        this.events.set(event, callbacks);
    }
    // 一次性订阅事件
    once(event, callback) {
        const onceCallback = (...args) => {
            callback(...args);
            this.off(event, onceCallback);
        };
        this.on(event, onceCallback);
        return this;
    }
    // 取消订阅事件
    off(event, callback) {
        const callbacks = this.events.get(event);
        if (callbacks) {
            const index = callbacks.indexOf(callback);
            if (index >= 0) {
                callbacks.splice(index, 1);
                if (callbacks.length === 0) {
                    this.events.delete(event);
                }
                else {
                    this.events.set(event, callbacks);
                }
            }
        }
    }
    // 发布事件
    emit(event, ...args) {
        const callbacks = this.events.get(event);
        if (callbacks) {
            callbacks.forEach((callback) => {
                callback(...args);
            });
        }
    }
    destroy() {
        this.events.clear();
    }
}
export default EventBus;
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