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index.js
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index.js
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"use strict";
var xinput = require('bindings')('xinput');
const EventEmitter = require('events');
class XInputDevice extends EventEmitter {
constructor(deviceNumber, options) {
super();
this.options = {
interval: 20,
deadzone: {
x: 0.20,
y: 0.15
},
holdtime: 500
};
if(options) {
Object.keys(options).forEach(option => this.setOption(option, options[option]));
}
this.deviceNumber = deviceNumber;
this.connected = xinput.IsConnected(this.deviceNumber);
this.state = xinput.GetState(this.deviceNumber);
this._previousState = this.state;
this._digitalStates = ['buttons', 'dpad', 'shoulder', 'thumb', 'control'];
this._analogStates = ['trigger', 'leftstick', 'rightstick'];
this._holdTimes = {};
this._holdTimers = {};
this.initLoop();
}
setOption(key, value) {
this.options[key] = value;
}
stopLoop() {
if(this.eventLoop == null) {
return;
}
clearInterval(this.eventLoop);
}
initLoop() {
this.stopLoop();
this.eventLoop = setInterval(this._update.bind(this), this.options.interval);
}
getNormalizedState(section, button) {
return this._normalize(section, button, this.state[section][button]);
}
_normalize(section, button, val) {
if(section == "leftstick" || section == "rightstick") {
let normed = Math.max(-1, val / 32767);
let zoned = (Math.abs(normed) < this.options.deadzone[button] ? 0 : (Math.abs(normed) - this.options.deadzone[button]) * (normed / Math.abs(normed)));
if (this.options.deadzone[button] > 0) zoned /= 1 - this.options.deadzone[button];
return zoned;
}
return val;
}
_onConnectedChanged(isConnected) {
this.emit("connection-changed", isConnected);
this.emit("connection-" + isConnected ? "established" : "closed");
}
_onInputChanged(section, button, state) {
let key = `${section}.${button}`;
this.emit("_input-changed", key, state);
if(this._digitalStates.indexOf(section) != -1) {
this.emit("button-changed", key, state);
if(state) {
this._holdTimes[key] = new Date().getTime();
this._holdTimers[key] = setTimeout((() => {
let now = new Date().getTime();
let timePressed = this._holdTimes[key] || now;
let elapsed = now - timePressed;
this.emit("button-long", key, elapsed);
}).bind(this), this.options.holdtime);
} else {
let now = new Date().getTime();
let timePressed = this._holdTimes[key] || now;
let elapsed = now - timePressed;
clearTimeout(this._holdTimers[key]);
if(elapsed < this.options.holdtime) {
this.emit("button-short", key, elapsed);
}
}
}
}
_update() {
let state = xinput.GetState(this.deviceNumber);
let connected = xinput.IsConnected(this.deviceNumber);
this.state = state;
if(this.connected != connected) {
this._onConnectedChanged(connected);
this.connected = connected;
}
Object.keys(state).forEach(section => {
Object.keys(state[section]).forEach(button => {
let value = this._normalize(section, button, state[section][button]);
let previous = this._normalize(section, button, this._previousState[section][button]);
if(previous != value) {
this._onInputChanged(section, button, value);
}
});
});
this._analogStates.forEach(section => {
let hasInput = false;
let values = {};
Object.keys(state[section]).forEach(button => {
let value = this._normalize(section, button, state[section][button]);
if(value != 0) {
hasInput = true;
}
values[button] = value;
});
if(hasInput) {
this.emit("analog-input", section, values);
}
});
this._previousState = state;
}
}
xinput.WrapController = function(deviceNumber, options) {
return new XInputDevice(deviceNumber, options);
};
module.exports = xinput;