次からは30分でできるElectronの環境構築（Windows10）

# Electron (Windows10) 2016-05-23

自分用メモ。
Windows10 64bit
調べながらだと１時間くらいかかった。

## 参考記事
http://qiita.com/kusohage/items/00a4fb624894f88970dc
http://qiita.com/nyanchu/items/15d514d9b9f87e5c0a29


## Node.js インストール
### nodejs ダウンロード
https://nodejs.org/en/download/

自分はCドライブ直下に"Development"フォルダを作って以下にインストール。バージョンはv4.4.4


```
C:\Development\nodejs\v4.4.4
```

##環境変数の設定


- [スタート]を右クリック
- [システム] > [システムの詳細設定] > [詳細設定]タブから[環境変数]をクリック
- NODE_HOME変数作成
    - ○○のユーザ環境変数で[新規]をクリック
    - 変数名「NODE_HOME」/ 変数値「C:\Program Files\nodejs\v4.4.4」設定。

- PATH変数修正
    - PATHを選択して[編集]をクリック
    - 変数値に「;%NODE_HOME%」を追記。先程の例だと以下

```
C:\Development\nodejs\v4.4.4;%NODE_HOME%
```

##Electronのインストール
先ほどのnode.exeのあるディレクトリで

```
> npm -g install electron-prebuilt
```

*※自分はこのあたりでPCを再起動した。*



##ElectronのHello World
公式のQuick Startを見ながら３つのファイルを用意。全部コピペ。
https://github.com/electron/electron/blob/v1.1.1/docs/tutorial/quick-start.md

**フォルダ構造**

```
your-app/
├── package.json
├── main.js
└── index.html
```


**package.json**

```
{
  "name"    : "your-app",
  "version" : "0.1.0",
  "main"    : "main.js"
}
```

**main.js**

```js

const electron = require('electron');
// Module to control application life.
const {app} = electron;
// Module to create native browser window.
const {BrowserWindow} = electron;

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let win;

function createWindow() {
  // Create the browser window.
  win = new BrowserWindow({width: 800, height: 600});

  // and load the index.html of the app.
  win.loadURL(`file://${__dirname}/index.html`);

  // Open the DevTools.
  win.webContents.openDevTools();

  // Emitted when the window is closed.
  win.on('closed', () => {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    win = null;
  });
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow);

// Quit when all windows are closed.
app.on('window-all-closed', () => {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit();
  }
});

app.on('activate', () => {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (win === null) {
    createWindow();
  }
});

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.
```


**index.html**

```html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Hello World!</title>
  </head>
  <body>
    <h1>Hello World!</h1>
    We are using node <script>document.write(process.versions.node)</script>,
    Chrome <script>document.write(process.versions.chrome)</script>,
    and Electron <script>document.write(process.versions.electron)</script>.
  </body>
</html>
```

コマンドラインから、これらのファイルのあるディレクトリで

```
> electron .
```

以上。