Modify existing code to use JavascriptChannelRegistry.

This commit modifies the existing code to make use of the
JavascriptChannelRegistry class.

Author: mvanbeusekom

packages/webview_flutter/webview_flutter_platform_interface/lib/src/method_channel/webview_method_channel.dart

@@ -6,19 +6,25 @@ import 'dart:async';
 
 import 'package:flutter/services.dart';
 
+import '../platform_interface/javascript_channel_registry.dart';
 import '../platform_interface/platform_interface.dart';
 import '../types/types.dart';
 
 /// A [WebViewPlatformController] that uses a method channel to control the webview.
 class MethodChannelWebViewPlatform implements WebViewPlatformController {
   /// Constructs an instance that will listen for webviews broadcasting to the
   /// given [id], using the given [WebViewPlatformCallbacksHandler].
-  MethodChannelWebViewPlatform(int id, this._platformCallbacksHandler)
-      : assert(_platformCallbacksHandler != null),
+  MethodChannelWebViewPlatform(
+    int id,
+    this._platformCallbacksHandler,
+    this._javascriptChannelRegistry,
+  )   : assert(_platformCallbacksHandler != null),
         _channel = MethodChannel('plugins.flutter.io/webview_$id') {
     _channel.setMethodCallHandler(_onMethodCall);
   }
 
+  final JavascriptChannelRegistry _javascriptChannelRegistry;
+
   final WebViewPlatformCallbacksHandler _platformCallbacksHandler;
 
   final MethodChannel _channel;
@@ -31,7 +37,7 @@ class MethodChannelWebViewPlatform implements WebViewPlatformController {
       case 'javascriptChannelMessage':
         final String channel = call.arguments['channel']!;
         final String message = call.arguments['message']!;
-        _platformCallbacksHandler.onJavaScriptChannelMessage(channel, message);
+        _javascriptChannelRegistry.onJavascriptChannelMessage(channel, message);
         return true;
       case 'navigationRequest':
         return await _platformCallbacksHandler.onNavigationRequest(

packages/webview_flutter/webview_flutter_platform_interface/lib/src/platform_interface/platform_interface.dart

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+export 'javascript_channel_registry.dart';
 export 'webview_platform.dart';
 export 'webview_platform_callbacks_handler.dart';
 export 'webview_platform_controller.dart';

packages/webview_flutter/webview_flutter_platform_interface/lib/src/platform_interface/webview_platform.dart

@@ -5,6 +5,7 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/widgets.dart';
+import 'package:webview_flutter_platform_interface/src/platform_interface/javascript_channel_registry.dart';
 
 import '../types/types.dart';
 import 'webview_platform_callbacks_handler.dart';
@@ -50,6 +51,7 @@ abstract class WebViewPlatform {
     // I'll followup with the conversion PR.
     required CreationParams creationParams,
     required WebViewPlatformCallbacksHandler webViewPlatformCallbacksHandler,
+    required JavascriptChannelRegistry javascriptChannelRegistry,
     WebViewPlatformCreatedCallback? onWebViewPlatformCreated,
     Set<Factory<OneSequenceGestureRecognizer>>? gestureRecognizers,
   });

packages/webview_flutter/webview_flutter_platform_interface/lib/src/platform_interface/webview_platform_callbacks_handler.dart

@@ -11,9 +11,6 @@ import '../types/types.dart';
 /// The webview plugin implements this class, and passes an instance to the [WebViewPlatformController].
 /// [WebViewPlatformController] is notifying this handler on events that happened on the platform's webview.
 abstract class WebViewPlatformCallbacksHandler {
-  /// Invoked by [WebViewPlatformController] when a JavaScript channel message is received.
-  void onJavaScriptChannelMessage(String channel, String message);
-
   /// Invoked by [WebViewPlatformController] when a navigation request is pending.
   ///
   /// If true is returned the navigation is allowed, otherwise it is blocked.

packages/webview_flutter/webview_flutter_platform_interface/test/src/method_channel/webview_method_channel_test.dart

@@ -17,7 +17,9 @@ void main() {
     const MethodChannel channel =
     MethodChannel('plugins.flutter.io/webview_$channelId');
     final WebViewPlatformCallbacksHandler callbacksHandler =
-    MockWebViewPlatformCallbacksHandler();
+      MockWebViewPlatformCallbacksHandler();
+    final JavascriptChannelRegistry javascriptChannelRegistry =
+      MockJavascriptChannelRegistry();
 
     final List<MethodCall> log = <MethodCall>[];
     channel.setMockMethodCallHandler((MethodCall methodCall) async {
@@ -46,6 +48,7 @@ void main() {
     MethodChannelWebViewPlatform(
       channelId,
       callbacksHandler,
+      javascriptChannelRegistry,
     );
 
     tearDown(() {
@@ -449,3 +452,6 @@ void main() {
 
 class MockWebViewPlatformCallbacksHandler extends Mock
     implements WebViewPlatformCallbacksHandler {}
+
+class MockJavascriptChannelRegistry extends Mock
+    implements JavascriptChannelRegistry {}