91 lines
2.9 KiB
JavaScript
91 lines
2.9 KiB
JavaScript
// Communicate with the Scratch Device Manager through Socket.IO
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window.ScratchDeviceManager = new (function () {
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var self = this;
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// device-manager.scratch.mit.edu = 127.0.0.1
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self.deviceManagerHost = 'https://device-manager.scratch.mit.edu:3030';
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// work around https://github.com/socketio/socket.io-client/issues/812
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function connectNamespace(namespace) {
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return io(self.deviceManagerHost + namespace, {forceNew: true});
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}
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self.wedo2_list = function (callback) {
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$.ajax(self.deviceManagerHost + '/wedo2/list', {
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dataType: 'text',
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success: function (data, textStatus, jqXHR) {
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var deviceList = JSON.parse(data);
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if (deviceList.constructor == Array) {
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callback(deviceList);
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}
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}
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});
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};
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// TODO: handle multiple devices
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self.wedo2_open = function (deviceId, callback) {
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var socket = connectNamespace('/wedo2');
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var pluginDevice = new RawWeDo2(deviceId, socket);
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socket.on('deviceWasOpened', function (event) {
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callback(pluginDevice);
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});
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socket.emit('open', {deviceId: deviceId});
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};
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function RawWeDo2(deviceId, socket) {
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var WeDo = this;
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var eventHandlers = {};
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WeDo.close = function() {
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socket.close();
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};
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WeDo.setMotorOn = function(motorIndex, power) {
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socket.emit('motorOn', {motorIndex:motorIndex, power:power});
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};
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WeDo.setMotorOff = function(motorIndex) {
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socket.emit('motorOff', {motorIndex:motorIndex});
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};
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WeDo.setMotorBrake = function(motorIndex) {
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socket.emit('motorBrake', {motorIndex:motorIndex});
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};
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WeDo.setLED = function(rgb) {
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socket.emit('setLED', {rgb:rgb});
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};
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WeDo.playTone = function(tone, durationMs) {
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socket.emit('playTone', {tone:tone, ms:durationMs});
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};
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WeDo.stopTone = function() {
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socket.emit('stopTone');
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};
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function setHandler(eventName, handler) {
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if (eventHandlers.hasOwnProperty(eventName)) {
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var oldHandler = eventHandlers[eventName];
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if (oldHandler) {
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socket.removeListener(eventName, oldHandler);
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}
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}
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if (handler) {
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socket.on(eventName, handler);
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}
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eventHandlers[eventName] = handler;
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}
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// function handler(event) { access event.sensorName and event.sensorValue }
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WeDo.setSensorHandler = function (handler) {
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setHandler('sensorChanged', handler);
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};
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WeDo.setDeviceWasClosedHandler = function (handler) {
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// TODO: resolve this ambiguity
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setHandler('disconnect', handler);
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setHandler('deviceWasClosed', handler);
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};
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}
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})();
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