node-buzzers/dist/buzzer.js

Forked version of 'buzz-buzzers', updated and upgraded to support multiple USB dongles

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function Buzzer(device) {
    // Array of states
    // `false` means the button is not pressed
    // and `true` when a button is pressed
    let previousStates = [
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
        false,
    ];
    const changeListeners = new Set();
    const errorListeners = new Set();
    const pressListeners = new Set();
    const releaseListeners = new Set();
    const indexToBuzzerEventData = (index) => {
        const buttons = 5;
        const controllerIndex = Math.floor(index / buttons);
        return {
            controller: (controllerIndex + 1),
            button: (index - controllerIndex * buttons),
        };
    };
    const triggerEvent = (eventType, payload) => {
        switch (eventType) {
            case "change":
                changeListeners.forEach((listener) => listener(payload));
                break;
            case "error":
                errorListeners.forEach((listener) => listener(payload));
                break;
            case "press":
                pressListeners.forEach((listener) => listener(payload));
                break;
            case "release":
                releaseListeners.forEach((listener) => listener(payload));
        }
    };
    // Turn off all leds by default
    try {
        device.setLeds([false, false, false, false]);
    }
    catch (err) {
        // older versions don't have an led
    }
    device.onChange((states) => {
        states.forEach((state, index) => {
            const previousState = previousStates[index];
            if (state !== previousState) {
                const eventType = state ? "press" : "release";
                triggerEvent(eventType, indexToBuzzerEventData(index));
            }
        });
        triggerEvent("change", states);
        previousStates = states;
    });
    device.onError(function (err) {
        triggerEvent("error", err);
    });
    return {
        setLeds(led1, led2, led3, led4) {
            try {
                device.setLeds([led1, led2, led3, led4]);
            }
            catch (err) {
                const message = "Could not set led status. Older versions of the buzz buzzers do not support this.";
                triggerEvent("error", message);
            }
        },
        onChange(cb) {
            changeListeners.add(cb);
        },
        onError(cb) {
            errorListeners.add(cb);
        },
        onPress(cb) {
            pressListeners.add(cb);
        },
        onRelease(cb) {
            releaseListeners.add(cb);
        },
        removeEventListener(type, callback) {
            switch (type) {
                case "change":
                    changeListeners.delete(callback);
                    break;
                case "error":
                    errorListeners.delete(callback);
                    break;
                case "press":
                    pressListeners.delete(callback);
                    break;
                case "release":
                    releaseListeners.delete(callback);
                    break;
            }
        },
    };
}
exports.default = Buzzer;
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