flutter_webview_plugin: WebView Plugin - Allows Flutter to communicate with a native WebView. Maintainer: @slightfoot

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# Flutter WebView Plugin

[![pub package](https://img.shields.io/pub/v/flutter_webview_plugin.svg)](https://pub.dartlang.org/packages/flutter_webview_plugin)

Plugin that allows Flutter to communicate with a native WebView.

**_Warning:_**
The webview is not integrated in the widget tree, it is a native view on top of the flutter view.
you won't be able to use snackbars, dialogs ...

## Getting Started

For help getting started with Flutter, view our online [documentation](http://flutter.io/).

### How it works

#### Launch WebView Fullscreen with Flutter navigation

```dart
new MaterialApp(
      routes: {
        "/": (_) => new WebviewScaffold(
          url: "https://www.google.com",
          appBar: new AppBar(
            title: new Text("Widget webview"),
          ),
        ),
      },
    );
```

Optional parameters `hidden` and `initialChild` are available so that you can show something else while waiting for the page to load.
If you set `hidden` to true it will show a default CircularProgressIndicator. If you additionally specify a Widget for initialChild
you can have it display whatever you like till page-load.

e.g. The following will show a read screen with the text 'waiting.....'.
```dart
return new MaterialApp(
  title: 'Flutter WebView Demo',
  theme: new ThemeData(
    primarySwatch: Colors.blue,
  ),
  routes: {
    '/': (_) => const MyHomePage(title: 'Flutter WebView Demo'),
    '/widget': (_) => new WebviewScaffold(
      url: selectedUrl,
      appBar: new AppBar(
        title: const Text('Widget webview'),
      ),
      withZoom: true,
      withLocalStorage: true,
      hidden: true,
      initialChild: Container(
        color: Colors.redAccent,
        child: const Center(
          child: Text('Waiting.....'),
        ),
      ),
    ),
  },
);
```

`FlutterWebviewPlugin` provide a singleton instance linked to one unique webview,
so you can take control of the webview from anywhere in the app

listen for events

```dart
final flutterWebviewPlugin = new FlutterWebviewPlugin();

flutterWebviewPlugin.onUrlChanged.listen((String url) {

});
```

#### Listen for scroll event in webview

```dart
final flutterWebviewPlugin = new FlutterWebviewPlugin();
flutterWebviewPlugin.onScrollYChanged.listen((double offsetY) { // latest offset value in vertical scroll
  // compare vertical scroll changes here with old value
});

flutterWebviewPlugin.onScrollXChanged.listen((double offsetX) { // latest offset value in horizontal scroll
  // compare horizontal scroll changes here with old value
});

````

Note: Do note there is a slight difference is scroll distance between ios and android. Android scroll value difference tends to be larger than ios devices.

#### Hidden WebView

```dart
final flutterWebviewPlugin = new FlutterWebviewPlugin();

flutterWebviewPlugin.launch(url, hidden: true);
```

#### Close launched WebView

```dart
flutterWebviewPlugin.close();
```

#### Webview inside custom Rectangle

```dart
final flutterWebviewPlugin = new FlutterWebviewPlugin();

flutterWebviewPlugin.launch(url,
  fullScreen: false,
  rect: new Rect.fromLTWH(
    0.0,
    0.0,
    MediaQuery.of(context).size.width,
    300.0,
  ),
);
```

### Webview Events

- `Stream<Null>` onDestroy
- `Stream<String>` onUrlChanged
- `Stream<WebViewStateChanged>` onStateChanged
- `Stream<double>` onScrollXChanged
- `Stream<double>` onScrollYChanged
- `Stream<String>` onError

**_Don't forget to dispose webview_**
`flutterWebviewPlugin.dispose()`

### Webview Functions

```dart
Future<Null> launch(String url, {
   Map<String, String> headers: null,
   bool withJavascript: true,
   bool clearCache: false,
   bool clearCookies: false,
   bool hidden: false,
   bool enableAppScheme: true,
   Rect rect: null,
   String userAgent: null,
   bool withZoom: false,
   bool withLocalStorage: true,
   bool withLocalUrl: true,
   bool scrollBar: true,
   bool supportMultipleWindows: false,
   bool appCacheEnabled: false,
   bool allowFileURLs: false,
});
```

```dart
Future<String> evalJavascript(String code);
```

```dart
Future<Map<String, dynamic>> getCookies();
```

```dart
Future<Null> cleanCookies();
```

```dart
Future<Null> resize(Rect rect);
```

```dart
Future<Null> show();
```

```dart
Future<Null> hide();
```

```dart
Future<Null> reloadUrl(String url);
```

```dart
Future<Null> close();
```

```dart
Future<Null> reload();
```

```dart
Future<Null> goBack();
```

```dart
Future<Null> goForward();
```

```dart
Future<Null> stopLoading();
```

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