[web_view]Expose the allowsLinkPreview property in WKWebView for iOS

packages/webview_flutter/webview_flutter/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 4.4.2
+
+* Adds support for the `allowsLinkPreview` property on iOS.
+
 ## 4.4.1
 
 * Exposes `JavaScriptLogLevel` from platform interface.

packages/webview_flutter/webview_flutter/example/pubspec.yaml

@@ -29,6 +29,11 @@ dev_dependencies:
     sdk: flutter
   webview_flutter_platform_interface: ^2.3.0
 
+# FOR TESTING ONLY. DO NOT MERGE.
+dependency_overrides:
+  webview_flutter_platform_interface:
+    path: ../../webview_flutter_platform_interface
+
 flutter:
   uses-material-design: true
   assets:

packages/webview_flutter/webview_flutter/lib/src/legacy/webview.dart

@@ -92,6 +92,7 @@ class WebView extends StatefulWidget {
     this.onWebResourceError,
     this.debuggingEnabled = false,
     this.gestureNavigationEnabled = false,
+    this.allowsLinkPreview = true,
     this.userAgent,
     this.zoomEnabled = true,
     this.initialMediaPlaybackPolicy =
@@ -260,6 +261,13 @@ class WebView extends StatefulWidget {
   /// By default `gestureNavigationEnabled` is false.
   final bool gestureNavigationEnabled;
 
+  /// Whether pressing a link displays a preview of the destination for the link.
+  ///
+  /// Not supported on all platforms.
+  ///
+  /// By default `allowsLinkPreview` is true.
+  final bool allowsLinkPreview;
+
   /// The value used for the HTTP User-Agent: request header.
   ///
   /// When null the platform's webview default is used for the User-Agent header.
@@ -380,6 +388,7 @@ WebSettings _webSettingsFromWidget(WebView widget) {
     hasProgressTracking: widget.onProgress != null,
     debuggingEnabled: widget.debuggingEnabled,
     gestureNavigationEnabled: widget.gestureNavigationEnabled,
+    allowsLinkPreview: widget.allowsLinkPreview,
     allowsInlineMediaPlayback: widget.allowsInlineMediaPlayback,
     userAgent: WebSetting<String?>.of(widget.userAgent),
     zoomEnabled: widget.zoomEnabled,
@@ -397,13 +406,15 @@ WebSettings _clearUnchangedWebSettings(
   assert(newValue.hasNavigationDelegate != null);
   assert(newValue.debuggingEnabled != null);
   assert(newValue.zoomEnabled != null);
+  assert(newValue.allowsLinkPreview != null);
 
   JavascriptMode? javascriptMode;
   bool? hasNavigationDelegate;
   bool? hasProgressTracking;
   bool? debuggingEnabled;
   WebSetting<String?> userAgent = const WebSetting<String?>.absent();
   bool? zoomEnabled;
+  bool? allowsLinkPreview;
   if (currentValue.javascriptMode != newValue.javascriptMode) {
     javascriptMode = newValue.javascriptMode;
   }
@@ -422,6 +433,9 @@ WebSettings _clearUnchangedWebSettings(
   if (currentValue.zoomEnabled != newValue.zoomEnabled) {
     zoomEnabled = newValue.zoomEnabled;
   }
+  if (currentValue.allowsLinkPreview != newValue.allowsLinkPreview) {
+    allowsLinkPreview = newValue.allowsLinkPreview;
+  }
 
   return WebSettings(
     javascriptMode: javascriptMode,
@@ -430,6 +444,7 @@ WebSettings _clearUnchangedWebSettings(
     debuggingEnabled: debuggingEnabled,
     userAgent: userAgent,
     zoomEnabled: zoomEnabled,
+    allowsLinkPreview: allowsLinkPreview,
   );
 }
 

packages/webview_flutter/webview_flutter/lib/src/webview_controller.dart

@@ -354,6 +354,11 @@ class WebViewController {
     return platform.setUserAgent(userAgent);
   }
 
+  /// Whether to display a preview of the destination for the link
+  Future<void> setAllowsLinkPreview(bool allow) {
+    return platform.setAllowsLinkPreview(allow);
+  }
+
   /// Sets a callback that notifies the host application on any log messages
   /// written to the JavaScript console.
   ///

packages/webview_flutter/webview_flutter/pubspec.yaml

@@ -2,7 +2,7 @@ name: webview_flutter
 description: A Flutter plugin that provides a WebView widget on Android and iOS.
 repository: https://github.com/flutter/packages/tree/main/packages/webview_flutter/webview_flutter
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+webview%22
-version: 4.4.1
+version: 4.4.2
 
 environment:
   sdk: ">=2.19.0 <4.0.0"
@@ -23,6 +23,11 @@ dependencies:
   webview_flutter_platform_interface: ^2.6.0
   webview_flutter_wkwebview: ^3.9.0
 
+# FOR TESTING ONLY. DO NOT MERGE.
+dependency_overrides:
+  webview_flutter_platform_interface:
+    path: ../webview_flutter_platform_interface
+
 dev_dependencies:
   build_runner: ^2.1.5
   flutter_test:

packages/webview_flutter/webview_flutter/test/legacy/webview_flutter_test.dart

@@ -1114,6 +1114,58 @@ void main() {
     });
   });
 
+  group('allowsLinkPreview', () {
+    testWidgets('defaults to true', (WidgetTester tester) async {
+      await tester.pumpWidget(const WebView());
+
+      final CreationParams params = captureBuildArgs(
+        mockWebViewPlatform,
+        creationParams: true,
+      ).single as CreationParams;
+
+      expect(params.webSettings!.allowsLinkPreview, true);
+    });
+
+    testWidgets('can be disabled', (WidgetTester tester) async {
+      await tester.pumpWidget(const WebView(
+        allowsLinkPreview: false,
+      ));
+
+      final CreationParams params = captureBuildArgs(
+        mockWebViewPlatform,
+        creationParams: true,
+      ).single as CreationParams;
+
+      expect(params.webSettings!.allowsLinkPreview, false);
+    });
+
+    testWidgets('can be changed', (WidgetTester tester) async {
+      final GlobalKey key = GlobalKey();
+      await tester.pumpWidget(WebView(key: key));
+
+      await tester.pumpWidget(WebView(
+        key: key,
+        allowsLinkPreview: false,
+      ));
+
+      final WebSettings enabledSettings =
+          verify(mockWebViewPlatformController.updateSettings(captureAny))
+              .captured
+              .last as WebSettings;
+      expect(enabledSettings.allowsLinkPreview, false);
+
+      await tester.pumpWidget(WebView(
+        key: key,
+      ));
+
+      final WebSettings disabledSettings =
+          verify(mockWebViewPlatformController.updateSettings(captureAny))
+              .captured
+              .last as WebSettings;
+      expect(disabledSettings.allowsLinkPreview, true);
+    });
+  });
+
   group('Custom platform implementation', () {
     setUp(() {
       WebView.platform = MyWebViewPlatform();
@@ -1143,6 +1195,7 @@ void main() {
               debuggingEnabled: false,
               userAgent: const WebSetting<String?>.of(null),
               gestureNavigationEnabled: true,
+              allowsLinkPreview: true,
               zoomEnabled: true,
             ),
           )));
@@ -1326,6 +1379,7 @@ class MatchesWebSettings extends Matcher {
         _webSettings!.gestureNavigationEnabled ==
             webSettings.gestureNavigationEnabled &&
         _webSettings!.userAgent == webSettings.userAgent &&
+        _webSettings!.allowsLinkPreview == webSettings.allowsLinkPreview &&
         _webSettings!.zoomEnabled == webSettings.zoomEnabled;
   }
 }

packages/webview_flutter/webview_flutter/test/webview_controller_test.dart

@@ -336,6 +336,18 @@ void main() {
     );
   });
 
+  test('setAllowsLinkPreview', () async {
+    final MockPlatformWebViewController mockPlatformWebViewController =
+        MockPlatformWebViewController();
+
+    final WebViewController webViewController = WebViewController.fromPlatform(
+      mockPlatformWebViewController,
+    );
+
+    await webViewController.setAllowsLinkPreview(false);
+    verify(mockPlatformWebViewController.setAllowsLinkPreview(false));
+  });
+
   test('setUserAgent', () async {
     final MockPlatformWebViewController mockPlatformWebViewController =
         MockPlatformWebViewController();

packages/webview_flutter/webview_flutter/test/webview_controller_test.mocks.dart

@@ -343,6 +343,17 @@ class MockPlatformWebViewController extends _i1.Mock
         returnValue: _i5.Future<void>.value(),
         returnValueForMissingStub: _i5.Future<void>.value(),
       ) as _i5.Future<void>);
+
+  @override
+  _i5.Future<void> setAllowsLinkPreview(bool? allow) => (super.noSuchMethod(
+        Invocation.method(
+          #setAllowsLinkPreview,
+          [allow],
+        ),
+        returnValue: _i5.Future<void>.value(),
+        returnValueForMissingStub: _i5.Future<void>.value(),
+      ) as _i5.Future<void>);
+
   @override
   _i5.Future<void> setOnPlatformPermissionRequest(
           void Function(_i2.PlatformWebViewPermissionRequest)?

packages/webview_flutter/webview_flutter/test/webview_widget_test.mocks.dart

@@ -361,6 +361,17 @@ class MockPlatformWebViewController extends _i1.Mock
         returnValue: _i7.Future<void>.value(),
         returnValueForMissingStub: _i7.Future<void>.value(),
       ) as _i7.Future<void>);
+
+  @override
+  _i7.Future<void> setAllowsLinkPreview(bool? allow) => (super.noSuchMethod(
+        Invocation.method(
+          #setAllowsLinkPreview,
+          [allow],
+        ),
+        returnValue: _i7.Future<void>.value(),
+        returnValueForMissingStub: _i7.Future<void>.value(),
+      ) as _i7.Future<void>);
+
   @override
   _i7.Future<void> setOnPlatformPermissionRequest(
           void Function(_i2.PlatformWebViewPermissionRequest)?

packages/webview_flutter/webview_flutter_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.6.1
+
+* Adds support for the `allowsLinkPreview` property on iOS.
+
 ## 2.6.0
 
 * Adds support to register a callback to intercept messages that are written to

packages/webview_flutter/webview_flutter_platform_interface/lib/src/legacy/types/web_settings.dart

@@ -82,6 +82,7 @@ class WebSettings {
     this.hasProgressTracking,
     this.debuggingEnabled,
     this.gestureNavigationEnabled,
+    this.allowsLinkPreview,
     this.allowsInlineMediaPlayback,
     this.zoomEnabled,
     required this.userAgent,
@@ -125,8 +126,13 @@ class WebSettings {
   /// See also: [WebView.gestureNavigationEnabled]
   final bool? gestureNavigationEnabled;
 
+  /// Determines whether pressing a link displays a preview of the destination for the link in iOS.
+  ///
+  /// See also: [WebView.allowsLinkPreview]
+  final bool? allowsLinkPreview;
+
   @override
   String toString() {
-    return 'WebSettings(javascriptMode: $javascriptMode, hasNavigationDelegate: $hasNavigationDelegate, hasProgressTracking: $hasProgressTracking, debuggingEnabled: $debuggingEnabled, gestureNavigationEnabled: $gestureNavigationEnabled, userAgent: $userAgent, allowsInlineMediaPlayback: $allowsInlineMediaPlayback)';
+    return 'WebSettings(javascriptMode: $javascriptMode, hasNavigationDelegate: $hasNavigationDelegate, hasProgressTracking: $hasProgressTracking, debuggingEnabled: $debuggingEnabled, gestureNavigationEnabled: $gestureNavigationEnabled, allowsLinkPreview: $allowsLinkPreview, userAgent: $userAgent, allowsInlineMediaPlayback: $allowsInlineMediaPlayback)';
   }
 }

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

@@ -261,6 +261,11 @@ abstract class PlatformWebViewController extends PlatformInterface {
         'setUserAgent is not implemented on the current platform');
   }
 
+  /// Whether to display a preview of the destination for the link
+  ///
+  /// This is not supported by all platforms, so it defaults to a noop
+  Future<void> setAllowsLinkPreview(bool allow) async {}
+
   /// Sets a callback that notifies the host application that web content is
   /// requesting permission to access the specified resources.
   Future<void> setOnPlatformPermissionRequest(

packages/webview_flutter/webview_flutter_platform_interface/pubspec.yaml

@@ -4,7 +4,7 @@ repository: https://github.com/flutter/packages/tree/main/packages/webview_flutt
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+webview_flutter%22
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 2.6.0
+version: 2.6.1
 
 environment:
   sdk: ">=2.19.0 <4.0.0"

packages/webview_flutter/webview_flutter_wkwebview/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 3.9.3
+
+* Adds support for the `allowsLinkPreview` property on iOS.
+
 ## 3.9.2
 
 * Fixes error caused by calling `WKWebViewConfiguration.limitsNavigationsToAppBoundDomains` on

packages/webview_flutter/webview_flutter_wkwebview/example/ios/RunnerTests/FWFWebViewHostApiTests.m

@@ -353,6 +353,22 @@ - (void)testSetAllowsBackForwardNavigationGestures {
   XCTAssertNil(error);
 }
 
+- (void)testSetAllowsLinkPreview {
+  FWFWebView *mockWebView = OCMClassMock([FWFWebView class]);
+
+  FWFInstanceManager *instanceManager = [[FWFInstanceManager alloc] init];
+  [instanceManager addDartCreatedInstance:mockWebView withIdentifier:0];
+
+  FWFWebViewHostApiImpl *hostAPI = [[FWFWebViewHostApiImpl alloc]
+      initWithBinaryMessenger:OCMProtocolMock(@protocol(FlutterBinaryMessenger))
+              instanceManager:instanceManager];
+
+  FlutterError *error;
+  [hostAPI setAllowsLinkPreviewForWebViewWithIdentifier:@0 isAllowed:@NO error:&error];
+  OCMVerify([mockWebView setAllowsLinkPreview:NO]);
+  XCTAssertNil(error);
+}
+
 - (void)testEvaluateJavaScript {
   FWFWebView *mockWebView = OCMClassMock([FWFWebView class]);
 

packages/webview_flutter/webview_flutter_wkwebview/example/lib/legacy/web_view.dart

@@ -68,6 +68,7 @@ class WebView extends StatefulWidget {
     this.onWebResourceError,
     this.debuggingEnabled = false,
     this.gestureNavigationEnabled = false,
+    this.allowsLinkPreview = true,
     this.userAgent,
     this.zoomEnabled = true,
     this.initialMediaPlaybackPolicy =
@@ -205,6 +206,13 @@ class WebView extends StatefulWidget {
   /// By default `gestureNavigationEnabled` is false.
   final bool gestureNavigationEnabled;
 
+  /// Whether pressing a link displays a preview of the destination for the link.
+  ///
+  /// Not supported on all platforms.
+  ///
+  /// By default `allowsLinkPreview` is true, to match the default on iOS.
+  final bool allowsLinkPreview;
+
   /// The value used for the HTTP User-Agent: request header.
   ///
   /// When null the platform's webview default is used for the User-Agent header.
@@ -618,6 +626,7 @@ WebSettings _webSettingsFromWidget(WebView widget) {
     hasProgressTracking: widget.onProgress != null,
     debuggingEnabled: widget.debuggingEnabled,
     gestureNavigationEnabled: widget.gestureNavigationEnabled,
+    allowsLinkPreview: widget.allowsLinkPreview,
     allowsInlineMediaPlayback: widget.allowsInlineMediaPlayback,
     userAgent: WebSetting<String?>.of(widget.userAgent),
     zoomEnabled: widget.zoomEnabled,

packages/webview_flutter/webview_flutter_wkwebview/example/pubspec.yaml

@@ -25,6 +25,11 @@ dev_dependencies:
   integration_test:
     sdk: flutter
 
+# FOR TESTING ONLY. DO NOT MERGE.
+dependency_overrides:
+  webview_flutter_platform_interface:
+    path: ../../webview_flutter_platform_interface
+
 flutter:
   uses-material-design: true
   assets:

packages/webview_flutter/webview_flutter_wkwebview/ios/Classes/FWFGeneratedWebKitApis.h

@@ -744,6 +744,12 @@ NSObject<FlutterMessageCodec> *FWFWKWebViewHostApiGetCodec(void);
 - (void)setAllowsBackForwardForWebViewWithIdentifier:(NSNumber *)identifier
                                            isAllowed:(NSNumber *)allow
                                                error:(FlutterError *_Nullable *_Nonnull)error;
+- (void)setAllowsLinkPreviewForWebViewWithIdentifier:(NSNumber *)identifier
+                                           isAllowed:(NSNumber *)allow
+                                               error:(FlutterError *_Nullable *_Nonnull)error;
+- (void)setUserAgentForWebViewWithIdentifier:(NSNumber *)identifier
+                                   userAgent:(nullable NSString *)userAgent
+                                       error:(FlutterError *_Nullable *_Nonnull)error;
 - (void)setCustomUserAgentForWebViewWithIdentifier:(NSNumber *)identifier
                                          userAgent:(nullable NSString *)userAgent
                                              error:(FlutterError *_Nullable *_Nonnull)error;