[webview_flutter] Add android webSettings.setTextZoom api (flutter#3298)

[webview_flutter] Add android `webSettings.setTextZoom` api

Author: apremalal

packages/webview_flutter/webview_flutter_android/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 3.4.0
 
+* Adds support to set text zoom of a page. See `AndroidWebViewController.setTextZoom`.
 * Aligns Dart and Flutter SDK constraints.
 
 ## 3.3.2

packages/webview_flutter/webview_flutter_android/android/src/main/java/io/flutter/plugins/webviewflutter/GeneratedAndroidWebView.java

@@ -1603,6 +1603,8 @@ public interface WebSettingsHostApi {
 
     void setAllowFileAccess(@NonNull Long instanceId, @NonNull Boolean enabled);
 
+    void setTextZoom(@NonNull Long instanceId, @NonNull Long textZoom);
+
     /** The codec used by WebSettingsHostApi. */
     static MessageCodec<Object> getCodec() {
       return new StandardMessageCodec();
@@ -2050,6 +2052,39 @@ static void setup(BinaryMessenger binaryMessenger, WebSettingsHostApi api) {
           channel.setMessageHandler(null);
         }
       }
+      {
+        BasicMessageChannel<Object> channel =
+            new BasicMessageChannel<>(
+                binaryMessenger, "dev.flutter.pigeon.WebSettingsHostApi.setTextZoom", getCodec());
+        if (api != null) {
+          channel.setMessageHandler(
+              (message, reply) -> {
+                ArrayList<Object> wrapped = new ArrayList<Object>();
+                try {
+                  ArrayList<Object> args = (ArrayList<Object>) message;
+                  assert args != null;
+                  Number instanceIdArg = (Number) args.get(0);
+                  if (instanceIdArg == null) {
+                    throw new NullPointerException("instanceIdArg unexpectedly null.");
+                  }
+                  Number textZoomArg = (Number) args.get(1);
+                  if (textZoomArg == null) {
+                    throw new NullPointerException("textZoomArg unexpectedly null.");
+                  }
+                  api.setTextZoom(
+                      (instanceIdArg == null) ? null : instanceIdArg.longValue(),
+                      (textZoomArg == null) ? null : textZoomArg.longValue());
+                  wrapped.add(0, null);
+                } catch (Error | RuntimeException exception) {
+                  ArrayList<Object> wrappedError = wrapError(exception);
+                  wrapped = wrappedError;
+                }
+                reply.reply(wrapped);
+              });
+        } else {
+          channel.setMessageHandler(null);
+        }
+      }
     }
   }
   /** Generated interface from Pigeon that represents a handler of messages from Flutter. */

packages/webview_flutter/webview_flutter_android/android/src/main/java/io/flutter/plugins/webviewflutter/WebSettingsHostApiImpl.java

@@ -120,4 +120,10 @@ public void setAllowFileAccess(Long instanceId, Boolean enabled) {
     final WebSettings webSettings = (WebSettings) instanceManager.getInstance(instanceId);
     webSettings.setAllowFileAccess(enabled);
   }
+
+  @Override
+  public void setTextZoom(Long instanceId, Long textZoom) {
+    final WebSettings webSettings = (WebSettings) instanceManager.getInstance(instanceId);
+    webSettings.setTextZoom(textZoom.intValue());
+  }
 }

packages/webview_flutter/webview_flutter_android/android/src/test/java/io/flutter/plugins/webviewflutter/WebSettingsTest.java

@@ -107,4 +107,10 @@ public void setBuiltInZoomControls() {
     testHostApiImpl.setBuiltInZoomControls(0L, true);
     verify(mockWebSettings).setBuiltInZoomControls(true);
   }
+
+  @Test
+  public void setTextZoom() {
+    testHostApiImpl.setTextZoom(0L, 100L);
+    verify(mockWebSettings).setTextZoom(100);
+  }
 }

packages/webview_flutter/webview_flutter_android/lib/src/android_webview.dart

@@ -591,6 +591,13 @@ class WebSettings extends JavaObject {
     return api.setAllowFileAccessFromInstance(this, enabled);
   }
 
+  /// Sets the text zoom of the page in percent.
+  ///
+  /// The default is 100. See https://developer.android.com/reference/android/webkit/WebSettings#setTextZoom(int)
+  Future<void> setTextZoom(int textZoom) {
+    return api.setSetTextZoomFromInstance(this, textZoom);
+  }
+
   @override
   WebSettings copy() {
     return WebSettings.detached();

packages/webview_flutter/webview_flutter_android/lib/src/android_webview.g.dart

@@ -1250,6 +1250,28 @@ class WebSettingsHostApi {
       return;
     }
   }
+
+  Future<void> setTextZoom(int arg_instanceId, int arg_textZoom) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.WebSettingsHostApi.setTextZoom', codec,
+        binaryMessenger: _binaryMessenger);
+    final List<Object?>? replyList = await channel
+        .send(<Object?>[arg_instanceId, arg_textZoom]) as List<Object?>?;
+    if (replyList == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyList.length > 1) {
+      throw PlatformException(
+        code: replyList[0]! as String,
+        message: replyList[1] as String?,
+        details: replyList[2],
+      );
+    } else {
+      return;
+    }
+  }
 }
 
 class JavaScriptChannelHostApi {

packages/webview_flutter/webview_flutter_android/lib/src/android_webview_api_impls.dart

@@ -434,6 +434,14 @@ class WebSettingsHostApiImpl extends WebSettingsHostApi {
     return setSupportZoom(instanceManager.getIdentifier(instance)!, support);
   }
 
+  /// Helper method to convert instances ids to objects.
+  Future<void> setSetTextZoomFromInstance(
+    WebSettings instance,
+    int textZoom,
+  ) {
+    return setTextZoom(instanceManager.getIdentifier(instance)!, textZoom);
+  }
+
   /// Helper method to convert instances ids to objects.
   Future<void> setLoadWithOverviewModeFromInstance(
     WebSettings instance,

packages/webview_flutter/webview_flutter_android/lib/src/android_webview_controller.dart

@@ -355,6 +355,12 @@ class AndroidWebViewController extends PlatformWebViewController {
     return _webView.settings.setMediaPlaybackRequiresUserGesture(require);
   }
 
+  /// Sets the text zoom of the page in percent.
+  ///
+  /// The default is 100.
+  Future<void> setTextZoom(int textZoom) =>
+      _webView.settings.setTextZoom(textZoom);
+
   /// Sets the callback that is invoked when the client should show a file
   /// selector.
   Future<void> setOnShowFileSelector(

packages/webview_flutter/webview_flutter_android/pigeons/android_webview.dart

@@ -218,6 +218,8 @@ abstract class WebSettingsHostApi {
   void setBuiltInZoomControls(int instanceId, bool enabled);
 
   void setAllowFileAccess(int instanceId, bool enabled);
+
+  void setTextZoom(int instanceId, int textZoom);
 }
 
 @HostApi(dartHostTestHandler: 'TestJavaScriptChannelHostApi')

packages/webview_flutter/webview_flutter_android/pubspec.yaml

@@ -2,7 +2,7 @@ name: webview_flutter_android
 description: A Flutter plugin that provides a WebView widget on Android.
 repository: https://github.com/flutter/packages/tree/main/packages/webview_flutter/webview_flutter_android
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+webview%22
-version: 3.3.2
+version: 3.4.0
 
 environment:
   sdk: ">=2.17.0 <3.0.0"