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Created May 18, 2015 02:55
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NW.js Launcher Demo
Raw
index.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>NW.js Launcher Demo</title>
<style>
body {
font-family: sans-serif;
}
#app-settings button[type="submit"] {
float: right;
}
.debug {
bottom: 1em;
position: fixed;
font-size: 1.5em;
text-align: center;
width: 100%;
}
</style>
</head>
<body>
<form id="app-settings">
<fieldset>
<legend>App Settings:</legend>
GPU Acceleration:
<select id="gpu-acceleration">
<option value="1">Enabled</option>
<option value="0">Disabled</option>
</select>
<button type="submit">Apply Settings &amp; Reload App</button>
</fieldset>
</form>
<div class="debug">
<a href="chrome://gpu">chrome://gpu</a>
</div>
<script>
document.addEventListener('DOMContentLoaded', function() {
var fs = require('fs');
var win = require('nw.gui').Window.get();
var $ = document.querySelector.bind(document);
// You can also write to localStorage, or whatever. Your launcher app
// would have to load and read the SQLite3 DB from NW's data path in
// that case.
// Display current config value in dropdown.
fs.readFile('config.json', function(error, data) {
if(!error) {
var config = JSON.parse(data);
if(config.hasOwnProperty('gpuEnabled')) {
var target = 2 - (config.gpuEnabled === true);
$('#gpu-acceleration :nth-child(' + target +')').selected = true;
}
}
});
// Save config selection to a local file and restart the app.
$('#app-settings').onsubmit = function(event) {
event.preventDefault();
var config = {
gpuEnabled: !!+$('#gpu-acceleration').value
};
// Incomplete. Should use a lock or multiple instances.
fs.writeFile('config.json', JSON.stringify(config), function(error) {
win.close();
if(!error) require('child_process').exec('launcher --restart');
});
return false;
};
});
</script>
</body>
</html>
Raw
launcher.go
// If on Windows, build with: -ldflags -H=windowsgui
package main
import (
"encoding/json"
"io/ioutil"
"os/exec"
"flag"
"time"
"os"
)
type Config struct {
GpuEnabled bool
}
func spawnApp(arguments ...string) {
args := "--ignore-gpu-blacklist"
if len(arguments) > 0 {
args = arguments[0]
}
exec.Command("./nw", args).Start()
os.Exit(0)
}
func main() {
isRestart := flag.Bool("restart", false, "")
flag.Parse()
// Should use a proper locking mechanism, instead.
if *isRestart {
time.Sleep(1 * time.Second)
}
data, error := ioutil.ReadFile("./config.json")
if error != nil {
spawnApp()
}
var config Config
error = json.Unmarshal(data, &config)
if error != nil {
spawnApp()
}
if !config.GpuEnabled {
spawnApp("--disable-gpu")
}
spawnApp()
}
Raw
package.json
{
"name": "nw.js-launcher-demo",
"main": "index.html"
}
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