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index.js
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index.js
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import React from 'react';
import { View, WebView } from 'react-native';
var js = `
var haveEvents = 'GamepadEvent' in window;
var haveWebkitEvents = 'WebKitGamepadEvent' in window;
var controllers = {};
var rAF = window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.requestAnimationFrame;
var lastState;
function connecthandler(e) {
addgamepad(e.gamepad);
}
function addgamepad(gamepad) {
var message = {
'type': 'connect',
'data': gamepad.index,
};
window.postMessage(JSON.stringify(message));
controllers[gamepad.index] = gamepad;
rAF(updateStatus);
}
function disconnecthandler(e) {
removegamepad(e.gamepad);
}
function removegamepad(gamepad) {
var message = {
'type': 'disconnect',
'data': gamepad.index,
};
window.postMessage(JSON.stringify(message));
delete controllers[gamepad.index];
}
function updateStatus() {
scangamepads();
for (j in controllers) {
var controller = controllers[j];
var data = {
gamepadID: j,
buttons: [],
axes: [],
};
for (var i=0; i<controller.buttons.length; i++) {
var val = controller.buttons[i];
var pressed = val == 1.0;
if (typeof(val) == "object") {
pressed = val.pressed;
val = val.value;
}
data.buttons.push(pressed);
}
for (var i=0; i<controller.axes.length; i++) {
data.axes.push(controller.axes[i].toFixed(4));
}
var stateJSON = JSON.stringify(data);
if(stateJSON !== controller._lastState){
var message = {
'type': 'data',
'data': data,
};
window.postMessage(JSON.stringify(message));
lastState = data;
controller._lastState = stateJSON;
}
}
rAF(updateStatus);
}
function scangamepads() {
var gamepads = navigator.getGamepads ? navigator.getGamepads() : (navigator.webkitGetGamepads ? navigator.webkitGetGamepads() : []);
for (var i = 0; i < gamepads.length; i++) {
if (gamepads[i]) {
if (!(gamepads[i].index in controllers)) {
addgamepad(gamepads[i]);
} else {
controllers[gamepads[i].index] = gamepads[i];
}
}
}
}
if (haveEvents) {
window.addEventListener("gamepadconnected", connecthandler);
window.addEventListener("gamepaddisconnected", disconnecthandler);
} else if (haveWebkitEvents) {
window.addEventListener("webkitgamepadconnected", connecthandler);
window.addEventListener("webkitgamepaddisconnected", disconnecthandler);
} else {
setInterval(scangamepads, 500);
}
`;
export default class GamepadController extends React.Component {
parseMessage(data){
data = JSON.parse(data);
if(data.type == 'data'){
if(this.props.onData) this.props.onData(data.data);
}else if(data.type == 'connect'){
if(this.props.onConnect) this.props.onConnect(data.data);
}else if(data.type == 'disconnect'){
if(this.props.onDisconnectt) this.props.onDisconnect(data.data);
}
}
render() {
return (
<View style={{}}>
<WebView
source={{html: '<html><body>Loading...</body></html>'}}
onMessage={(evt)=> this.parseMessage(evt.nativeEvent.data)}
injectedJavaScript={js}
/>
</View>
);
}
}