[webview_flutter] Add zoomEnabled to webview flutter platform interface (flutter#4404)

This is the first-step task to add a zoomEnabled param on the WebView widget.

Author: NickalasB

packages/webview_flutter/webview_flutter_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.1.0
+
+* Add `zoomEnabled` functionality to `WebSettings`.
+
 ## 1.0.0
 
 * Extracted platform interface from `webview_flutter`.

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

@@ -200,6 +200,7 @@ class MethodChannelWebViewPlatform implements WebViewPlatformController {
     _addIfNonNull(
         'allowsInlineMediaPlayback', settings.allowsInlineMediaPlayback);
     _addSettingIfPresent('userAgent', settings.userAgent);
+    _addIfNonNull('zoomEnabled', settings.zoomEnabled);
     return map;
   }
 

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

@@ -78,6 +78,7 @@ class WebSettings {
     this.debuggingEnabled,
     this.gestureNavigationEnabled,
     this.allowsInlineMediaPlayback,
+    this.zoomEnabled,
     required this.userAgent,
   }) : assert(userAgent != null);
 
@@ -111,6 +112,9 @@ class WebSettings {
   /// See also [WebView.userAgent].
   final WebSetting<String?> userAgent;
 
+  /// Sets whether the WebView should support zooming using its on-screen zoom controls and gestures.
+  final bool? zoomEnabled;
+
   /// Whether to allow swipe based navigation in iOS.
   ///
   /// See also: [WebView.gestureNavigationEnabled]

packages/webview_flutter/webview_flutter_platform_interface/pubspec.yaml

@@ -4,7 +4,7 @@ repository: https://github.com/flutter/plugins/tree/master/packages/webview_flut
 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: 1.0.0
+version: 1.1.0
 
 environment:
   sdk: ">=2.12.0 <3.0.0"

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

@@ -5,7 +5,6 @@
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/mockito.dart';
-
 import 'package:webview_flutter_platform_interface/src/method_channel/webview_method_channel.dart';
 import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';
 
@@ -229,6 +228,7 @@ void main() {
         debuggingEnabled: true,
         gestureNavigationEnabled: true,
         allowsInlineMediaPlayback: true,
+        zoomEnabled: false,
       );
       await webViewPlatform.updateSettings(settings);
 
@@ -245,6 +245,7 @@ void main() {
               'debuggingEnabled': true,
               'gestureNavigationEnabled': true,
               'allowsInlineMediaPlayback': true,
+              'zoomEnabled': false,
             },
           ),
         ],