616 lines
24 KiB
Markdown
616 lines
24 KiB
Markdown
# Flutter InAppBrowser Plugin [](https://twitter.com/intent/tweet?text=Flutter%20InAppBrowser%20plugin!&url=https://github.com/pichillilorenzo/flutter_inappbrowser&hashtags=flutter,flutterio,dart,dartlang,webview) [](https://www.facebook.com/sharer/sharer.php?u=https%3A//github.com/pichillilorenzo/flutter_inappbrowser)
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[](https://pub.dartlang.org/packages/flutter_inappbrowser)
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[](/LICENSE)
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[](https://www.paypal.me/LorenzoPichilli)
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[](https://www.patreon.com/bePatron?u=9269604)
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A Flutter plugin that allows you to open an in-app browser window.
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This plugin is inspired by the popular [cordova-plugin-inappbrowser](https://github.com/apache/cordova-plugin-inappbrowser)!
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## Getting Started
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For help getting started with Flutter, view our online
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[documentation](https://flutter.io/).
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For help on editing plugin code, view the [documentation](https://flutter.io/developing-packages/#edit-plugin-package).
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## Installation
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First, add `flutter_inappbrowser` as a [dependency in your pubspec.yaml file](https://flutter.io/using-packages/).
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## Usage
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Classes:
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- [InAppBrowser](#inappbrowser): Native WebView.
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- [ChromeSafariBrowser](#chromesafaribrowser): [Chrome Custom Tabs](https://developer.android.com/reference/android/support/customtabs/package-summary) on Android / [SFSafariViewController](https://developer.apple.com/documentation/safariservices/sfsafariviewcontroller) on iOS.
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Screenshots [here](#screenshots).
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### `InAppBrowser` class
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Create a Class that extends the `InAppBrowser` Class in order to override the callbacks to manage the browser events.
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Example:
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```dart
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import 'package:flutter/material.dart';
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import 'package:flutter_inappbrowser/flutter_inappbrowser.dart';
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class MyInAppBrowser extends InAppBrowser {
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@override
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void onLoadStart(String url) {
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print("\n\nStarted $url\n\n");
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}
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@override
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Future onLoadStop(String url) async {
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print("\n\nStopped $url\n\n");
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// call a javascript message handler
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await this.injectScriptCode("window.flutter_inappbrowser.callHandler('handlerNameTest', 1, 5,'string', {'key': 5}, [4,6,8]);");
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// print body html
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print(await this.injectScriptCode("document.body.innerHTML"));
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// console messages
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await this.injectScriptCode("console.log({'testObject': 5});"); // the message will be: [object Object]
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await this.injectScriptCode("console.log('testObjectStringify', JSON.stringify({'testObject': 5}));"); // the message will be: testObjectStringify {"testObject": 5}
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await this.injectScriptCode("console.error('testError', false);"); // the message will be: testError false
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// add jquery library and custom javascript
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await this.injectScriptFile("https://code.jquery.com/jquery-3.3.1.min.js");
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this.injectScriptCode("""
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\$( "body" ).html( "Next Step..." )
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""");
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// add custom css
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this.injectStyleCode("""
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body {
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background-color: #3c3c3c !important;
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}
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""");
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this.injectStyleFile("https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css");
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}
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@override
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void onLoadError(String url, int code, String message) {
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print("\n\nCan't load $url.. Error: $message\n\n");
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}
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@override
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void onExit() {
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print("\n\nBrowser closed!\n\n");
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}
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@override
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void shouldOverrideUrlLoading(String url) {
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print("\n\n override $url\n\n");
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this.loadUrl(url);
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}
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@override
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void onLoadResource(WebResourceResponse response, WebResourceRequest request) {
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print("Started at: " + response.startTime.toString() + "ms ---> duration: " + response.duration.toString() + "ms " + response.url);
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}
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@override
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void onConsoleMessage(ConsoleMessage consoleMessage) {
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print("""
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console output:
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sourceURL: ${consoleMessage.sourceURL}
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lineNumber: ${consoleMessage.lineNumber}
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message: ${consoleMessage.message}
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messageLevel: ${consoleMessage.messageLevel}
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""");
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}
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}
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MyInAppBrowser inAppBrowser = new MyInAppBrowser();
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void main() => runApp(new MyApp());
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class MyApp extends StatefulWidget {
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@override
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_MyAppState createState() => new _MyAppState();
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}
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class _MyAppState extends State<MyApp> {
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@override
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void initState() {
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super.initState();
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// listen for post messages coming from the JavaScript side
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int indexTest = inAppBrowser.addJavaScriptHandler("handlerNameTest", (arguments) async {
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print("handlerNameTest arguments");
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print(arguments); // it prints: [1, 5, string, {key: 5}, [4, 6, 8]]
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});
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}
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@override
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Widget build(BuildContext context) {
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return new MaterialApp(
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home: new Scaffold(
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appBar: new AppBar(
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title: const Text('Flutter InAppBrowser Plugin example app'),
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),
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body: new Center(
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child: new RaisedButton(onPressed: () {
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inAppBrowser.open(url: "https://flutter.io/", options: {
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"useShouldOverrideUrlLoading": true,
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"useOnLoadResource": true
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});
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},
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child: Text("Open InAppBrowser")
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),
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),
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),
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);
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}
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}
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```
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#### Future\<void\> InAppBrowser.open
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Opens a URL in a new InAppBrowser instance or the system browser.
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```dart
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inAppBrowser.open({String url = "about:blank", Map<String, String> headers = const {}, String target = "_self", Map<String, dynamic> options = const {}});
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```
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Opens an `url` in a new `InAppBrowser` instance or the system browser.
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- `url`: The `url` to load. Call `encodeUriComponent()` on this if the `url` contains Unicode characters. The default value is `about:blank`.
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- `headers`: The additional headers to be used in the HTTP request for this URL, specified as a map from name to value.
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- `target`: The target in which to load the `url`, an optional parameter that defaults to `_self`.
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- `_self`: Opens in the `InAppBrowser`.
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- `_blank`: Opens in the `InAppBrowser`.
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- `_system`: Opens in the system's web browser.
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- `options`: Options for the `InAppBrowser`.
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All platforms support:
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- __useShouldOverrideUrlLoading__: Set to `true` to be able to listen at the `shouldOverrideUrlLoading` event. The default value is `false`.
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- __useOnLoadResource__: Set to `true` to be able to listen at the `onLoadResource()` event. The default value is `false`.
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- __clearCache__: Set to `true` to have all the browser's cache cleared before the new window is opened. The default value is `false`.
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- __userAgent___: Set the custom WebView's user-agent.
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- __javaScriptEnabled__: Set to `true` to enable JavaScript. The default value is `true`.
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- __javaScriptCanOpenWindowsAutomatically__: Set to `true` to allow JavaScript open windows without user interaction. The default value is `false`.
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- __hidden__: Set to `true` to create the browser and load the page, but not show it. The `onLoadStop` event fires when loading is complete. Omit or set to `false` (default) to have the browser open and load normally.
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- __toolbarTop__: Set to `false` to hide the toolbar at the top of the WebView. The default value is `true`.
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- __toolbarTopBackgroundColor__: Set the custom background color of the toolbat at the top.
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- __hideUrlBar__: Set to `true` to hide the url bar on the toolbar at the top. The default value is `false`.
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- __mediaPlaybackRequiresUserGesture__: Set to `true` to prevent HTML5 audio or video from autoplaying. The default value is `true`.
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**Android** supports these additional options:
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- __hideTitleBar__: Set to `true` if you want the title should be displayed. The default value is `false`.
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- __closeOnCannotGoBack__: Set to `false` to not close the InAppBrowser when the user click on the back button and the WebView cannot go back to the history. The default value is `true`.
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- __clearSessionCache__: Set to `true` to have the session cookie cache cleared before the new window is opened.
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- __builtInZoomControls__: Set to `true` if the WebView should use its built-in zoom mechanisms. The default value is `false`.
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- __supportZoom__: Set to `false` if the WebView should not support zooming using its on-screen zoom controls and gestures. The default value is `true`.
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- __databaseEnabled__: Set to `true` if you want the database storage API is enabled. The default value is `false`.
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- __domStorageEnabled__: Set to `true` if you want the DOM storage API is enabled. The default value is `false`.
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- __useWideViewPort__: Set to `true` if the WebView should enable support for the "viewport" HTML meta tag or should use a wide viewport. When the value of the setting is false, the layout width is always set to the width of the WebView control in device-independent (CSS) pixels. When the value is true and the page contains the viewport meta tag, the value of the width specified in the tag is used. If the page does not contain the tag or does not provide a width, then a wide viewport will be used. The default value is `true`.
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- __safeBrowsingEnabled__: Set to `true` if you want the Safe Browsing is enabled. Safe Browsing allows WebView to protect against malware and phishing attacks by verifying the links. The default value is `true`.
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- __progressBar__: Set to `false` to hide the progress bar at the bottom of the toolbar at the top. The default value is `true`.
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**iOS** supports these additional options:
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- __disallowOverScroll__: Set to `true` to disable the bouncing of the WebView when the scrolling has reached an edge of the content. The default value is `false`.
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- __toolbarBottom__: Set to `false` to hide the toolbar at the bottom of the WebView. The default value is `true`.
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- __toolbarBottomBackgroundColor__: Set the custom background color of the toolbat at the bottom.
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- __toolbarBottomTranslucent__: Set to `true` to set the toolbar at the bottom translucent. The default value is `true`.
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- __closeButtonCaption__: Set the custom text for the close button.
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- __closeButtonColor__: Set the custom color for the close button.
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- __presentationStyle__: Set the custom modal presentation style when presenting the WebView. The default value is `0 //fullscreen`. See [UIModalPresentationStyle](https://developer.apple.com/documentation/uikit/uimodalpresentationstyle) for all the available styles.
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- __transitionStyle__: Set to the custom transition style when presenting the WebView. The default value is `0 //crossDissolve`. See [UIModalTransitionStyle](https://developer.apple.com/documentation/uikit/uimodaltransitionStyle) for all the available styles.
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- __enableViewportScale__: Set to `true` to allow a viewport meta tag to either disable or restrict the range of user scaling. The default value is `false`.
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- __suppressesIncrementalRendering__: Set to `true` if you want the WebView suppresses content rendering until it is fully loaded into memory.. The default value is `false`.
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- __allowsAirPlayForMediaPlayback__: Set to `true` to allow AirPlay. The default value is `true`.
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- __allowsBackForwardNavigationGestures__: Set to `true` to allow the horizontal swipe gestures trigger back-forward list navigations. The default value is `true`.
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- __allowsLinkPreview__: Set to `true` to allow that pressing on a link displays a preview of the destination for the link. The default value is `true`.
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- __ignoresViewportScaleLimits__: Set to `true` if you want that the WebView should always allow scaling of the webpage, regardless of the author's intent. The ignoresViewportScaleLimits property overrides the `user-scalable` HTML property in a webpage. The default value is `false`.
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- __allowsInlineMediaPlayback__: Set to `true` to allow HTML5 media playback to appear inline within the screen layout, using browser-supplied controls rather than native controls. For this to work, add the `webkit-playsinline` attribute to any `<video>` elements. The default value is `false`.
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- __allowsPictureInPictureMediaPlayback__: Set to `true` to allow HTML5 videos play picture-in-picture. The default value is `true`.
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- __spinner__: Set to `false` to hide the spinner when the WebView is loading a page. The default value is `true`.
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Example:
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```dart
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inAppBrowser.open('https://flutter.io/', options: {
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"useShouldOverrideUrlLoading": true,
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"useOnLoadResource": true,
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"clearCache": true,
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"disallowOverScroll": true,
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"domStorageEnabled": true,
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"supportZoom": false,
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"toolbarBottomTranslucent": false,
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"allowsLinkPreview": false
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});
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```
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#### Events
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Event fires when the `InAppBrowser` starts to load an `url`.
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```dart
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@override
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void onLoadStart(String url) {
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}
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```
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Event fires when the `InAppBrowser` finishes loading an `url`.
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```dart
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@override
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void onLoadStop(String url) {
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}
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```
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Event fires when the `InAppBrowser` encounters an error loading an `url`.
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```dart
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@override
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void onLoadError(String url, String code, String message) {
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}
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```
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Event fires when the `InAppBrowser` window is closed.
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```dart
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@override
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void onExit() {
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}
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```
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Event fires when the `InAppBrowser` webview receives a `ConsoleMessage`.
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```dart
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@override
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void onConsoleMessage(ConsoleMessage consoleMessage) {
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}
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```
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Give the host application a chance to take control when a URL is about to be loaded in the current WebView.
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**NOTE**: In order to be able to listen this event, you need to set `useShouldOverrideUrlLoading` option to `true`.
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```dart
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@override
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void shouldOverrideUrlLoading(String url) {
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}
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```
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Event fires when the `InAppBrowser` webview loads a resource.
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**NOTE**: In order to be able to listen this event, you need to set `useOnLoadResource` option to `true`.
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**NOTE only for iOS**: In some cases, the `response.data` of a `response` with `text/html` encoding could be empty.
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```dart
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@override
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void onLoadResource(WebResourceResponse response, WebResourceRequest request) {
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}
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```
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#### Future\<void\> InAppBrowser.loadUrl
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Loads the given `url` with optional `headers` specified as a map from name to value.
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```dart
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inAppBrowser.loadUrl(String url, {Map<String, String> headers = const {}});
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```
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#### Future\<void\> InAppBrowser.show
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Displays an `InAppBrowser` window that was opened hidden. Calling this has no effect if the `InAppBrowser` was already visible.
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```dart
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inAppBrowser.show();
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```
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#### Future\<void\> InAppBrowser.hide
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Hides the `InAppBrowser` window. Calling this has no effect if the `InAppBrowser` was already hidden.
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```dart
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inAppBrowser.hide();
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```
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#### Future\<void\> InAppBrowser.close
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Closes the `InAppBrowser` window.
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```dart
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inAppBrowser.close();
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```
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#### Future\<void\> InAppBrowser.reload
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Reloads the `InAppBrowser` window.
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```dart
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inAppBrowser.reload();
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```
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#### Future\<void\> InAppBrowser.goBack
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Goes back in the history of the `InAppBrowser` window.
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```dart
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inAppBrowser.goBack();
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```
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#### Future\<void\> InAppBrowser.goForward
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Goes forward in the history of the `InAppBrowser` window.
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```dart
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inAppBrowser.goForward();
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```
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#### Future\<bool\> InAppBrowser.isLoading
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Check if the Web View of the `InAppBrowser` instance is in a loading state.
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```dart
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inAppBrowser.isLoading();
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```
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#### Future\<void\> InAppBrowser.stopLoading
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Stops the Web View of the `InAppBrowser` instance from loading.
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```dart
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inAppBrowser.stopLoading();
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```
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#### Future\<bool\> InAppBrowser.isHidden
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Check if the Web View of the `InAppBrowser` instance is hidden.
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```dart
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inAppBrowser.isHidden();
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```
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#### Future\<String\> InAppBrowser.injectScriptCode
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Injects JavaScript code into the `InAppBrowser` window and returns the result of the evaluation. (Only available when the target is set to `_blank` or to `_self`)
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```dart
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inAppBrowser.injectScriptCode(String source);
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```
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#### Future\<void\> InAppBrowser.injectScriptFile
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Injects a JavaScript file into the `InAppBrowser` window. (Only available when the target is set to `_blank` or to `_self`)
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```dart
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inAppBrowser.injectScriptFile(String urlFile);
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```
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#### Future\<void\> InAppBrowser.injectStyleCode
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Injects CSS into the `InAppBrowser` window. (Only available when the target is set to `_blank` or to `_self`)
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```dart
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inAppBrowser.injectStyleCode(String source);
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```
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#### Future\<void\> InAppBrowser.injectStyleFile
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Injects a CSS file into the `InAppBrowser` window. (Only available when the target is set to `_blank` or to `_self`)
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```dart
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inAppBrowser.injectStyleFile(String urlFile);
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```
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#### int InAppBrowser.addJavaScriptHandler
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Adds/Appends a JavaScript message handler `callback` (`JavaScriptHandlerCallback`) that listen to post messages sent from JavaScript by the handler with name `handlerName`.
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Returns the position `index` of the handler that can be used to remove it with the `removeJavaScriptHandler()` method.
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The Android implementation uses [addJavascriptInterface](https://developer.android.com/reference/android/webkit/WebView#addJavascriptInterface(java.lang.Object,%20java.lang.String)).
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The iOS implementation uses [addScriptMessageHandler](https://developer.apple.com/documentation/webkit/wkusercontentcontroller/1537172-addscriptmessagehandler?language=objc)
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The JavaScript function that can be used to call the handler is `window.flutter_inappbrowser.callHandler(handlerName <String>, ...args);`, where `args` are [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters).
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The `args` will be stringified automatically using `JSON.stringify(args)` method and then they will be decoded on the Dart side.
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```dart
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inAppBrowser.addJavaScriptHandler(String handlerName, JavaScriptHandlerCallback callback);
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```
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#### bool InAppBrowser.removeJavaScriptHandler
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Removes a JavaScript message handler previously added with the `addJavaScriptHandler()` method in the `handlerName` list by its position `index`.
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Returns `true` if the callback is removed, otherwise `false`.
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```dart
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inAppBrowser.removeJavaScriptHandler(String handlerName, int index);
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```
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### `ChromeSafariBrowser` class
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Create a Class that extends the `ChromeSafariBrowser` Class in order to override the callbacks to manage the browser events. Example:
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```dart
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import 'package:flutter/material.dart';
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import 'package:flutter_inappbrowser/flutter_inappbrowser.dart';
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class MyInAppBrowser extends InAppBrowser {
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@override
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Future onLoadStart(String url) async {
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print("\n\nStarted $url\n\n");
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}
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@override
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Future onLoadStop(String url) async {
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print("\n\nStopped $url\n\n");
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}
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@override
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void onLoadError(String url, int code, String message) {
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print("\n\nCan't load $url.. Error: $message\n\n");
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}
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@override
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void onExit() {
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print("\n\nBrowser closed!\n\n");
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}
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}
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MyInAppBrowser inAppBrowserFallback = new MyInAppBrowser();
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class MyChromeSafariBrowser extends ChromeSafariBrowser {
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MyChromeSafariBrowser(browserFallback) : super(browserFallback);
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@override
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void onOpened() {
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print("ChromeSafari browser opened");
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}
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@override
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void onLoaded() {
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print("ChromeSafari browser loaded");
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}
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@override
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void onClosed() {
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print("ChromeSafari browser closed");
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}
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}
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MyChromeSafariBrowser chromeSafariBrowser = new MyChromeSafariBrowser(inAppBrowserFallback);
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void main() => runApp(new MyApp());
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class MyApp extends StatefulWidget {
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@override
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_MyAppState createState() => new _MyAppState();
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}
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class _MyAppState extends State<MyApp> {
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@override
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void initState() {
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super.initState();
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}
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@override
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Widget build(BuildContext context) {
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return new MaterialApp(
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home: new Scaffold(
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appBar: new AppBar(
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title: const Text('Flutter InAppBrowser Plugin example app'),
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),
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body: new Center(
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child: new RaisedButton(onPressed: () {
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chromeSafariBrowser.open("https://flutter.io/", options: {
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"addShareButton": false,
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"toolbarBackgroundColor": "#000000",
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"dismissButtonStyle": 1,
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"preferredBarTintColor": "#000000",
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},
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optionsFallback: {
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"toolbarTopBackgroundColor": "#000000",
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"closeButtonCaption": "Close"
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});
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},
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child: Text("Open ChromeSafariBrowser")
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),
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),
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),
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);
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}
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}
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```
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#### Future\<void\> ChromeSafariBrowser.open
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Opens an `url` in a new `ChromeSafariBrowser` instance or the system browser.
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- `url`: The `url` to load. Call `encodeUriComponent()` on this if the `url` contains Unicode characters.
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- `options`: Options for the `ChromeSafariBrowser`.
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- `headersFallback`: The additional header of the `InAppBrowser` instance fallback to be used in the HTTP request for this URL, specified as a map from name to value.
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- `optionsFallback`: Options used by the `InAppBrowser` instance fallback.
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**Android** supports these options:
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- __addShareButton__: Set to `false` if you don't want the default share button. The default value is `true`.
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- __showTitle__: Set to `false` if the title shouldn't be shown in the custom tab. The default value is `true`.
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- __toolbarBackgroundColor__: Set the custom background color of the toolbar.
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- __enableUrlBarHiding__: Set to `true` to enable the url bar to hide as the user scrolls down on the page. The default value is `false`.
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- __instantAppsEnabled__: Set to `true` to enable Instant Apps. The default value is `false`.
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**iOS** supports these options:
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- __entersReaderIfAvailable__: Set to `true` if Reader mode should be entered automatically when it is available for the webpage. The default value is `false`.
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- __barCollapsingEnabled__: Set to `true` to enable bar collapsing. The default value is `false`.
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- __dismissButtonStyle__: Set the custom style for the dismiss button. The default value is `0 //done`. See [SFSafariViewController.DismissButtonStyle](https://developer.apple.com/documentation/safariservices/sfsafariviewcontroller/dismissbuttonstyle) for all the available styles.
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- __preferredBarTintColor__: Set the custom background color of the navigation bar and the toolbar.
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- __preferredControlTintColor__: Set the custom color of the control buttons on the navigation bar and the toolbar.
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- __presentationStyle__: Set the custom modal presentation style when presenting the WebView. The default value is `0 //fullscreen`. See [UIModalPresentationStyle](https://developer.apple.com/documentation/uikit/uimodalpresentationstyle) for all the available styles.
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- __transitionStyle__: Set to the custom transition style when presenting the WebView. The default value is `0 //crossDissolve`. See [UIModalTransitionStyle](https://developer.apple.com/documentation/uikit/uimodaltransitionStyle) for all the available styles.
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Example:
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```dart
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chromeSafariBrowser.open("https://flutter.io/", options: {
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"addShareButton": false,
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"toolbarBackgroundColor": "#000000",
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"dismissButtonStyle": 1,
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"preferredBarTintColor": "#000000",
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});
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```
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#### Events
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Event fires when the `ChromeSafariBrowser` is opened.
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```dart
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@override
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void onOpened() {
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}
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```
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Event fires when the `ChromeSafariBrowser` is loaded.
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```dart
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@override
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void onLoaded() {
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}
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```
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Event fires when the `ChromeSafariBrowser` is closed.
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```dart
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@override
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void onClosed() {
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}
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```
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## Screenshots:
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#### InAppBrowser
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iOS:
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Android:
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#### ChromeSafariBrowser
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iOS:
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Android:
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