[webview_flutter_web] Adds auto registration of the WebViewPlatform implementation (#6886)

* Adss auto reg

* test for registration

* update readme

Author: bparrishMines

packages/webview_flutter/webview_flutter_web/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.2.1
+
+* Adds auto registration of the `WebViewPlatform` implementation.
+
 ## 0.2.0
 
 * **BREAKING CHANGE** Updates platform implementation to `2.0.0` release of

packages/webview_flutter/webview_flutter_web/README.md

@@ -18,59 +18,6 @@ yet, so it currently requires extra setup to use:
 * [Add this package](https://pub.dev/packages/webview_flutter_web/install)
   as an explicit dependency of your project, in addition to depending on
   `webview_flutter`.
-* Register `WebWebViewPlatform` as the `WebViewPlatform.instance` before creating a
-  `WebView`. See below for examples.
 
-Once those steps below are complete, the APIs from `webview_flutter` listed
+Once the step above is complete, the APIs from `webview_flutter` listed
 above can be used as normal on web.
-
-### Registering the implementation
-
-Before creating a `WebView` (for instance, at the start of `main`), you will
-need to register the web implementation.
-
-#### Web-only project example
-
-```dart
-...
-import 'package:webview_flutter/webview_flutter.dart';
-import 'package:webview_flutter_web/webview_flutter_web.dart';
-
-main() {
-  WebViewPlatform.instance = WebWebViewPlatform();
-  ...
-```
-
-#### Multi-platform project example
-
-If your project supports platforms other than web, you will need to use a
-conditional import to avoid directly including `webview_flutter_web.dart` on
-non-web platforms. For example:
-
-`register_web_webview.dart`:
-```dart
-import 'package:webview_flutter/webview_flutter.dart';
-import 'package:webview_flutter_web/webview_flutter_web.dart';
-
-void registerWebViewWebImplementation() {
-  WebViewPlatform.instance = WebWebViewPlatform();
-}
-```
-
-`register_web_webview_stub.dart`:
-```dart
-void registerWebViewWebImplementation() {
-  // No-op.
-}
-```
-
-`main.dart`:
-```dart
-...
-import 'register_web_webview_stub.dart'
-    if (dart.library.html) 'register_web.dart';
-
-main() {
-  registerWebViewWebImplementation();
-  ...
-```

packages/webview_flutter/webview_flutter_web/lib/src/web_webview_platform.dart

@@ -24,5 +24,7 @@ class WebWebViewPlatform extends WebViewPlatform {
   }
 
   /// Gets called when the plugin is registered.
-  static void registerWith(Registrar registrar) {}
+  static void registerWith(Registrar registrar) {
+    WebViewPlatform.instance = WebWebViewPlatform();
+  }
 }

packages/webview_flutter/webview_flutter_web/pubspec.yaml

@@ -2,7 +2,7 @@ name: webview_flutter_web
 description: A Flutter plugin that provides a WebView widget on web.
 repository: https://github.com/flutter/plugins/tree/main/packages/webview_flutter/webview_flutter_web
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+webview%22
-version: 0.2.0
+version: 0.2.1
 
 environment:
   sdk: ">=2.14.0 <3.0.0"

packages/webview_flutter/webview_flutter_web/test/webview_flutter_web_test.dart

@@ -0,0 +1,17 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';
+import 'package:webview_flutter_web/webview_flutter_web.dart';
+
+void main() {
+  group('WebWebViewPlatform', () {
+    test('registerWith', () {
+      WebWebViewPlatform.registerWith(Registrar());
+      expect(WebViewPlatform.instance, isA<WebWebViewPlatform>());
+    });
+  });
+}