[webview_flutter_lwe] Implement onUrlChange for the navigation delegate

The lightweight web engine has no dedicated URL-change callback, so report a
URL change from the page-started handler: the native side now also invokes
onUrlChange with the navigation URL, and LweNavigationDelegate.setOnUrlChange
stores the callback and forwards the onUrlChange channel event instead of
throwing UnimplementedError.

Bump version to 0.4.2.

Author: seungsoo47

packages/webview_flutter_lwe/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.4.2
+
+* Implement `onUrlChange` for the navigation delegate.
+
 ## 0.4.1
 
 * Remove Ecore API.

packages/webview_flutter_lwe/README.md

@@ -21,7 +21,7 @@ This package is not an _endorsed_ implementation of `webview_flutter`. Therefore
 ```yaml
 dependencies:
   webview_flutter: ^4.13.1
-  webview_flutter_lwe: ^0.4.1
+  webview_flutter_lwe: ^0.4.2
 ```
 
 ## Example

packages/webview_flutter_lwe/lib/src/lwe_webview_controller.dart

@@ -388,6 +388,7 @@ class LweNavigationDelegate extends PlatformNavigationDelegate {
   ProgressCallback? _onProgress;
   WebResourceErrorCallback? _onWebResourceError;
   NavigationRequestCallback? _onNavigationRequest;
+  UrlChangeCallback? _onUrlChange;
 
   /// Called when [TizenView] is created.
   void onCreate(int viewId) {
@@ -431,6 +432,11 @@ class LweNavigationDelegate extends PlatformNavigationDelegate {
             );
           }
           return null;
+        case 'onUrlChange':
+          if (_onUrlChange != null) {
+            _onUrlChange!(UrlChange(url: arguments['url']! as String));
+          }
+          return null;
       }
 
       throw MissingPluginException(
@@ -506,10 +512,7 @@ class LweNavigationDelegate extends PlatformNavigationDelegate {
 
   @override
   Future<void> setOnUrlChange(UrlChangeCallback onUrlChange) async {
-    throw UnimplementedError(
-      'This version of `LweNavigationDelegate` currently has no '
-      'implementation for `setOnUrlChange`',
-    );
+    _onUrlChange = onUrlChange;
   }
 
   @override

packages/webview_flutter_lwe/pubspec.yaml

@@ -2,7 +2,7 @@ name: webview_flutter_lwe
 description: Tizen implementation of the webview_flutter plugin backed by Lightweight Web Engine.
 homepage: https://github.com/flutter-tizen/plugins
 repository: https://github.com/flutter-tizen/plugins/tree/master/packages/webview_flutter_lwe
-version: 0.4.1
+version: 0.4.2
 
 environment:
   sdk: ^3.8.0

packages/webview_flutter_lwe/tizen/src/webview.cc

@@ -156,6 +156,10 @@ WebView::WebView(flutter::PluginRegistrar* registrar, int view_id,
         dispatcher_->dispatchTaskOnMainThread([this, args]() {
           navigation_delegate_channel_->InvokeMethod(
               "onPageStarted", std::make_unique<flutter::EncodableValue>(args));
+          // The lightweight web engine has no dedicated URL-change callback, so
+          // report a URL change whenever a navigation starts.
+          navigation_delegate_channel_->InvokeMethod(
+              "onUrlChange", std::make_unique<flutter::EncodableValue>(args));
         });
       });
   webview_instance_->RegisterOnPageLoadedHandler(