[url_launcher] Fixes call to setState after dispose. (#5963)

Author: ditman

packages/url_launcher/url_launcher_web/CHANGELOG.md

@@ -1,3 +1,9 @@
+## 2.0.12
+
+* Fixes call to `setState` after dispose on the `Link` widget.
+[Issue](https://github.com/flutter/flutter/issues/102741).
+* Removes unused `BuildContext` from the `LinkViewController`.
+
 ## 2.0.11
 
 * Minor fixes for new analysis options.

packages/url_launcher/url_launcher_web/example/integration_test/link_widget_test.dart

@@ -123,6 +123,36 @@ void main() {
       final html.Element anchor = _findSingleAnchor();
       expect(anchor.hasAttribute('href'), false);
     });
+
+    testWidgets('can be created and disposed', (WidgetTester tester) async {
+      final Uri uri = Uri.parse('http://foobar');
+      const int itemCount = 500;
+      await tester.pumpWidget(
+        Directionality(
+          textDirection: TextDirection.ltr,
+          child: MediaQuery(
+            data: const MediaQueryData(),
+            child: ListView.builder(
+              itemCount: itemCount,
+              itemBuilder: (_, int index) => WebLinkDelegate(TestLinkInfo(
+                uri: uri,
+                target: LinkTarget.defaultTarget,
+                builder: (BuildContext context, FollowLink? followLink) =>
+                    Text('#$index', textAlign: TextAlign.center),
+              )),
+            ),
+          ),
+        ),
+      );
+
+      await tester.pumpAndSettle();
+
+      await tester.scrollUntilVisible(
+        find.text('#${itemCount - 1}'),
+        2500,
+        maxScrolls: 1000,
+      );
+    });
   });
 }
 

packages/url_launcher/url_launcher_web/lib/src/link.dart

@@ -76,7 +76,7 @@ class WebLinkDelegateState extends State<WebLinkDelegate> {
           child: PlatformViewLink(
             viewType: linkViewType,
             onCreatePlatformView: (PlatformViewCreationParams params) {
-              _controller = LinkViewController.fromParams(params, context);
+              _controller = LinkViewController.fromParams(params);
               return _controller
                 ..setUri(widget.link.uri)
                 ..setTarget(widget.link.target);
@@ -100,7 +100,7 @@ class WebLinkDelegateState extends State<WebLinkDelegate> {
 /// Controls link views.
 class LinkViewController extends PlatformViewController {
   /// Creates a [LinkViewController] instance with the unique [viewId].
-  LinkViewController(this.viewId, this.context) {
+  LinkViewController(this.viewId) {
     if (_instances.isEmpty) {
       // This is the first controller being created, attach the global click
       // listener.
@@ -113,12 +113,17 @@ class LinkViewController extends PlatformViewController {
   /// platform view [params].
   factory LinkViewController.fromParams(
     PlatformViewCreationParams params,
-    BuildContext context,
   ) {
     final int viewId = params.id;
-    final LinkViewController controller = LinkViewController(viewId, context);
+    final LinkViewController controller = LinkViewController(viewId);
     controller._initialize().then((_) {
-      params.onPlatformViewCreated(viewId);
+      /// Because _initialize is async, it can happen that [LinkViewController.dispose]
+      /// may get called before this `then` callback.
+      /// Check that the `controller` that was created by this factory is not
+      /// disposed before calling `onPlatformViewCreated`.
+      if (_instances[viewId] == controller) {
+        params.onPlatformViewCreated(viewId);
+      }
     });
     return controller;
   }
@@ -159,9 +164,6 @@ class LinkViewController extends PlatformViewController {
   @override
   final int viewId;
 
-  /// The context of the [Link] widget that created this controller.
-  final BuildContext context;
-
   late html.Element _element;
 
   bool get _isInitialized => _element != null;
@@ -208,7 +210,7 @@ class LinkViewController extends PlatformViewController {
     // browser handle it.
     event.preventDefault();
     final String routeName = _uri.toString();
-    pushRouteNameToFramework(context, routeName);
+    pushRouteNameToFramework(null, routeName);
   }
 
   Uri? _uri;

packages/url_launcher/url_launcher_web/pubspec.yaml

@@ -2,7 +2,7 @@ name: url_launcher_web
 description: Web platform implementation of url_launcher
 repository: https://github.com/flutter/plugins/tree/main/packages/url_launcher/url_launcher_web
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+url_launcher%22
-version: 2.0.11
+version: 2.0.12
 
 environment:
   sdk: ">=2.12.0 <3.0.0"