added onDownloadStartRequest event

CHANGELOG.md

@@ -3,6 +3,8 @@
 - `getOriginalUrl` method is cross-platform now
 - Updated Android `compileSdkVersion` to 31
 - Added `singleInstance` option for Android `ChromeSafariBrowser` implementation
+- Added `onDownloadStartRequest` event and deprecated old `onDownloadStart` event
+- Fixed missing `onZoomScaleChanged` call for `InAppBrowser` class
 - Fixed `requestImageRef` method always `null` on iOS
 - Fixed "applicationNameForUserAgent is not work in ios" [#525](https://github.com/pichillilorenzo/flutter_inappwebview/issues/525)
 - Fixed "Crash when try select file from webview input on Android" [#867](https://github.com/pichillilorenzo/flutter_inappwebview/issues/867)

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/in_app_webview/InAppWebView.java

@@ -37,6 +37,7 @@ import android.view.inputmethod.InputConnection;
 import android.view.inputmethod.InputMethodManager;
 import android.webkit.CookieManager;
 import android.webkit.DownloadListener;
+import android.webkit.URLUtil;
 import android.webkit.ValueCallback;
 import android.webkit.WebBackForwardList;
 import android.webkit.WebHistoryItem;
@@ -54,6 +55,7 @@ import androidx.webkit.WebViewCompat;
 import androidx.webkit.WebViewFeature;
 
 import com.pichillilorenzo.flutter_inappwebview.InAppWebViewFlutterPlugin;
+import com.pichillilorenzo.flutter_inappwebview.types.DownloadStartRequest;
 import com.pichillilorenzo.flutter_inappwebview.types.InAppWebViewInterface;
 import com.pichillilorenzo.flutter_inappwebview.JavaScriptBridgeInterface;
 import com.pichillilorenzo.flutter_inappwebview.R;
@@ -1181,14 +1183,17 @@ final public class InAppWebView extends InputAwareWebView implements InAppWebVie
 
   class DownloadStartListener implements DownloadListener {
     @Override
-    public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
+    public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimeType, long contentLength) {
-      Map<String, Object> obj = new HashMap<>();
+      DownloadStartRequest downloadStartRequest = new DownloadStartRequest(
-      obj.put("url", url);
+        url,
-      obj.put("userAgent", userAgent);
+        userAgent,
-      obj.put("contentDisposition", contentDisposition);
+        contentDisposition,
-      obj.put("mimetype", mimetype);
+        mimeType,
-      obj.put("contentLength", contentLength);
+        contentLength,
-      channel.invokeMethod("onDownloadStart", obj);
+        URLUtil.guessFileName(url, contentDisposition, mimeType),
+        null
+      );
+      channel.invokeMethod("onDownloadStartRequest", downloadStartRequest.toMap());
     }
   }
 

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/types/DownloadStartRequest.java

@@ -0,0 +1,150 @@
+package com.pichillilorenzo.flutter_inappwebview.types;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class DownloadStartRequest {
+  
+  @NonNull
+  private String url;
+  @NonNull
+  private String userAgent;
+  @NonNull
+  private String contentDisposition;
+  @NonNull
+  private String mimeType;
+  private long contentLength;
+  @Nullable
+  private String suggestedFilename;
+  @Nullable
+  private String textEncodingName;
+
+  public DownloadStartRequest(@NonNull String url, @NonNull String userAgent, @NonNull String contentDisposition, @NonNull String mimeType, long contentLength, @Nullable String suggestedFilename, @Nullable String textEncodingName) {
+    this.url = url;
+    this.userAgent = userAgent;
+    this.contentDisposition = contentDisposition;
+    this.mimeType = mimeType;
+    this.contentLength = contentLength;
+    this.suggestedFilename = suggestedFilename;
+    this.textEncodingName = textEncodingName;
+  }
+
+  public Map<String, Object> toMap() {
+    Map<String, Object> obj = new HashMap<>();
+    obj.put("url", url);
+    obj.put("userAgent", userAgent);
+    obj.put("contentDisposition", contentDisposition);
+    obj.put("mimeType", mimeType);
+    obj.put("contentLength", contentLength);
+    obj.put("suggestedFilename", suggestedFilename);
+    obj.put("textEncodingName", textEncodingName);
+    return obj;
+  }
+
+  @NonNull
+  public String getUrl() {
+    return url;
+  }
+
+  public void setUrl(@NonNull String url) {
+    this.url = url;
+  }
+
+  @NonNull
+  public String getUserAgent() {
+    return userAgent;
+  }
+
+  public void setUserAgent(@NonNull String userAgent) {
+    this.userAgent = userAgent;
+  }
+
+  @NonNull
+  public String getContentDisposition() {
+    return contentDisposition;
+  }
+
+  public void setContentDisposition(@NonNull String contentDisposition) {
+    this.contentDisposition = contentDisposition;
+  }
+
+  @NonNull
+  public String getMimeType() {
+    return mimeType;
+  }
+
+  public void setMimeType(@NonNull String mimeType) {
+    this.mimeType = mimeType;
+  }
+
+  public long getContentLength() {
+    return contentLength;
+  }
+
+  public void setContentLength(long contentLength) {
+    this.contentLength = contentLength;
+  }
+
+  @Nullable
+  public String getSuggestedFilename() {
+    return suggestedFilename;
+  }
+
+  public void setSuggestedFilename(@Nullable String suggestedFilename) {
+    this.suggestedFilename = suggestedFilename;
+  }
+
+  @Nullable
+  public String getTextEncodingName() {
+    return textEncodingName;
+  }
+
+  public void setTextEncodingName(@Nullable String textEncodingName) {
+    this.textEncodingName = textEncodingName;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o == null || getClass() != o.getClass()) return false;
+
+    DownloadStartRequest that = (DownloadStartRequest) o;
+
+    if (contentLength != that.contentLength) return false;
+    if (!url.equals(that.url)) return false;
+    if (!userAgent.equals(that.userAgent)) return false;
+    if (!contentDisposition.equals(that.contentDisposition)) return false;
+    if (!mimeType.equals(that.mimeType)) return false;
+    if (suggestedFilename != null ? !suggestedFilename.equals(that.suggestedFilename) : that.suggestedFilename != null)
+      return false;
+    return textEncodingName != null ? textEncodingName.equals(that.textEncodingName) : that.textEncodingName == null;
+  }
+
+  @Override
+  public int hashCode() {
+    int result = url.hashCode();
+    result = 31 * result + userAgent.hashCode();
+    result = 31 * result + contentDisposition.hashCode();
+    result = 31 * result + mimeType.hashCode();
+    result = 31 * result + (int) (contentLength ^ (contentLength >>> 32));
+    result = 31 * result + (suggestedFilename != null ? suggestedFilename.hashCode() : 0);
+    result = 31 * result + (textEncodingName != null ? textEncodingName.hashCode() : 0);
+    return result;
+  }
+
+  @Override
+  public String toString() {
+    return "DownloadStartRequest{" +
+            "url='" + url + '\'' +
+            ", userAgent='" + userAgent + '\'' +
+            ", contentDisposition='" + contentDisposition + '\'' +
+            ", mimeType='" + mimeType + '\'' +
+            ", contentLength=" + contentLength +
+            ", suggestedFilename='" + suggestedFilename + '\'' +
+            ", textEncodingName='" + textEncodingName + '\'' +
+            '}';
+  }
+}

example/.flutter-plugins-dependencies

@@ -1 +1 @@
-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_downloader","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/flutter_downloader-1.5.2/","dependencies":[]},{"name":"flutter_inappwebview","path":"/Users/lorenzopichilli/Desktop/flutter_inappwebview/","dependencies":[]},{"name":"integration_test","path":"/Users/lorenzopichilli/fvm/versions/2.10.4/packages/integration_test/","dependencies":[]},{"name":"path_provider","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider-2.0.0-nullsafety/","dependencies":[]},{"name":"permission_handler","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/permission_handler-5.1.0+2/","dependencies":[]},{"name":"url_launcher","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.0-nullsafety.6/","dependencies":[]}],"android":[{"name":"flutter_downloader","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/flutter_downloader-1.5.2/","dependencies":[]},{"name":"flutter_inappwebview","path":"/Users/lorenzopichilli/Desktop/flutter_inappwebview/","dependencies":[]},{"name":"integration_test","path":"/Users/lorenzopichilli/fvm/versions/2.10.4/packages/integration_test/","dependencies":[]},{"name":"path_provider","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider-2.0.0-nullsafety/","dependencies":[]},{"name":"permission_handler","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/permission_handler-5.1.0+2/","dependencies":[]},{"name":"url_launcher","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.0-nullsafety.6/","dependencies":[]}],"macos":[{"name":"path_provider_macos","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider_macos-0.0.5-nullsafety/","dependencies":[]},{"name":"url_launcher_macos","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher_macos-0.1.0-nullsafety.2/","dependencies":[]}],"linux":[{"name":"path_provider_linux","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider_linux-0.2.0-nullsafety/","dependencies":[]},{"name":"url_launcher_linux","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher_linux-0.1.0-nullsafety.3/","dependencies":[]}],"windows":[{"name":"path_provider_windows","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider_windows-0.1.0-nullsafety.3/","dependencies":[]},{"name":"url_launcher_windows","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher_windows-0.1.0-nullsafety.2/","dependencies":[]}],"web":[]},"dependencyGraph":[{"name":"flutter_downloader","dependencies":[]},{"name":"flutter_inappwebview","dependencies":[]},{"name":"integration_test","dependencies":[]},{"name":"path_provider","dependencies":["path_provider_macos","path_provider_linux","path_provider_windows"]},{"name":"path_provider_linux","dependencies":[]},{"name":"path_provider_macos","dependencies":[]},{"name":"path_provider_windows","dependencies":[]},{"name":"permission_handler","dependencies":[]},{"name":"url_launcher","dependencies":["url_launcher_linux","url_launcher_macos","url_launcher_windows"]},{"name":"url_launcher_linux","dependencies":[]},{"name":"url_launcher_macos","dependencies":[]},{"name":"url_launcher_windows","dependencies":[]}],"date_created":"2022-04-16 12:29:54.757036","version":"2.10.4"}
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_downloader","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/flutter_downloader-1.5.2/","dependencies":[]},{"name":"flutter_inappwebview","path":"/Users/lorenzopichilli/Desktop/flutter_inappwebview/","dependencies":[]},{"name":"integration_test","path":"/Users/lorenzopichilli/fvm/versions/2.10.4/packages/integration_test/","dependencies":[]},{"name":"path_provider","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider-2.0.0-nullsafety/","dependencies":[]},{"name":"permission_handler","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/permission_handler-5.1.0+2/","dependencies":[]},{"name":"url_launcher","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.0-nullsafety.6/","dependencies":[]}],"android":[{"name":"flutter_downloader","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/flutter_downloader-1.5.2/","dependencies":[]},{"name":"flutter_inappwebview","path":"/Users/lorenzopichilli/Desktop/flutter_inappwebview/","dependencies":[]},{"name":"integration_test","path":"/Users/lorenzopichilli/fvm/versions/2.10.4/packages/integration_test/","dependencies":[]},{"name":"path_provider","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider-2.0.0-nullsafety/","dependencies":[]},{"name":"permission_handler","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/permission_handler-5.1.0+2/","dependencies":[]},{"name":"url_launcher","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher-6.0.0-nullsafety.6/","dependencies":[]}],"macos":[{"name":"path_provider_macos","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider_macos-0.0.5-nullsafety/","dependencies":[]},{"name":"url_launcher_macos","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher_macos-0.1.0-nullsafety.2/","dependencies":[]}],"linux":[{"name":"path_provider_linux","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider_linux-0.2.0-nullsafety/","dependencies":[]},{"name":"url_launcher_linux","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher_linux-0.1.0-nullsafety.3/","dependencies":[]}],"windows":[{"name":"path_provider_windows","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/path_provider_windows-0.1.0-nullsafety.3/","dependencies":[]},{"name":"url_launcher_windows","path":"/Users/lorenzopichilli/.pub-cache/hosted/pub.dartlang.org/url_launcher_windows-0.1.0-nullsafety.2/","dependencies":[]}],"web":[]},"dependencyGraph":[{"name":"flutter_downloader","dependencies":[]},{"name":"flutter_inappwebview","dependencies":[]},{"name":"integration_test","dependencies":[]},{"name":"path_provider","dependencies":["path_provider_macos","path_provider_linux","path_provider_windows"]},{"name":"path_provider_linux","dependencies":[]},{"name":"path_provider_macos","dependencies":[]},{"name":"path_provider_windows","dependencies":[]},{"name":"permission_handler","dependencies":[]},{"name":"url_launcher","dependencies":["url_launcher_linux","url_launcher_macos","url_launcher_windows"]},{"name":"url_launcher_linux","dependencies":[]},{"name":"url_launcher_macos","dependencies":[]},{"name":"url_launcher_windows","dependencies":[]}],"date_created":"2022-04-17 16:15:55.135230","version":"2.10.4"}

example/integration_test/webview_flutter_test.dart

@@ -2705,7 +2705,7 @@ void main() {
       expect(numberOfMatches, 2);
     });
 
-    testWidgets('onDownloadStart', (WidgetTester tester) async {
+    testWidgets('onDownloadStartRequest', (WidgetTester tester) async {
       final Completer controllerCompleter = Completer<InAppWebViewController>();
       final Completer<String> onDownloadStartCompleter = Completer<String>();
       await tester.pumpWidget(
@@ -2739,8 +2739,8 @@ void main() {
             onWebViewCreated: (controller) {
               controllerCompleter.complete(controller);
             },
-            onDownloadStart:(controller, url, userAgent, contentDisposition, mimeType, contentLength) {
+            onDownloadStartRequest: (controller, request) {
-              onDownloadStartCompleter.complete(url.toString());
+              onDownloadStartCompleter.complete(request.url.toString());
             },
           ),
         ),

example/lib/in_app_webiew_example.screen.dart

@@ -24,7 +24,8 @@ class _InAppWebViewExampleScreenState extends State<InAppWebViewExampleScreen> {
   InAppWebViewGroupOptions options = InAppWebViewGroupOptions(
       crossPlatform: InAppWebViewOptions(
         useShouldOverrideUrlLoading: true,
-        mediaPlaybackRequiresUserGesture: false
+        mediaPlaybackRequiresUserGesture: false,
+        useOnDownloadStart: true
       ),
       android: AndroidInAppWebViewOptions(
         useHybridComposition: true,
@@ -123,7 +124,7 @@ class _InAppWebViewExampleScreenState extends State<InAppWebViewExampleScreen> {
                     key: webViewKey,
                     // contextMenu: contextMenu,
                     initialUrlRequest:
-                    URLRequest(url: Uri.parse("https://github.com/flutter")),
+                    URLRequest(url: Uri.parse("https://testfiledownload.com/")),
                     // initialFile: "assets/index.html",
                     initialUserScripts: UnmodifiableListView<UserScript>([]),
                     initialOptions: options,
@@ -131,6 +132,9 @@ class _InAppWebViewExampleScreenState extends State<InAppWebViewExampleScreen> {
                     onWebViewCreated: (controller) {
                       webViewController = controller;
                     },
+                    onDownloadStartRequest: (controller, request) {
+                      print(request);
+                    },
                     onLoadStart: (controller, url) {
                       setState(() {
                         this.url = url.toString();

ios/Classes/InAppWebView/InAppWebView.swift

@@ -1546,7 +1546,14 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
             let mimeType = navigationResponse.response.mimeType
             if let url = navigationResponse.response.url, navigationResponse.isForMainFrame {
                 if url.scheme != "file", mimeType != nil, !mimeType!.starts(with: "text/") {
-                    onDownloadStart(url: url.absoluteString)
+                    let downloadStartRequest = DownloadStartRequest(url: url.absoluteString,
+                                                                    userAgent: nil,
+                                                                    contentDisposition: nil,
+                                                                    mimeType: mimeType,
+                                                                    contentLength: navigationResponse.response.expectedContentLength,
+                                                                    suggestedFilename: navigationResponse.response.suggestedFilename,
+                                                                    textEncodingName: navigationResponse.response.textEncodingName)
+                    onDownloadStartRequest(request: downloadStartRequest)
                     if useOnNavigationResponse == nil || !useOnNavigationResponse! {
                         decisionHandler(.cancel)
                     }
@@ -2363,9 +2370,8 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
         channel?.invokeMethod("onOverScrolled", arguments: arguments)
     }
     
-    public func onDownloadStart(url: String) {
+    public func onDownloadStartRequest(request: DownloadStartRequest) {
-        let arguments: [String: Any] = ["url": url]
+        channel?.invokeMethod("onDownloadStartRequest", arguments: request.toMap())
-        channel?.invokeMethod("onDownloadStart", arguments: arguments)
     }
     
     public func onLoadResourceCustomScheme(url: String, result: FlutterResult?) {

ios/Classes/Types/DownloadStartRequest.swift

@@ -0,0 +1,42 @@
+//
+//  DownloadStartRequest.swift
+//  flutter_inappwebview
+//
+//  Created by Lorenzo Pichilli on 17/04/22.
+//
+
+import Foundation
+
+public class DownloadStartRequest: NSObject {
+    var url: String
+    var userAgent: String?
+    var contentDisposition: String?
+    var mimeType: String?
+    var contentLength: Int64
+    var suggestedFilename: String?
+    var textEncodingName: String?
+    
+    public init(url: String, userAgent: String?, contentDisposition: String?,
+                mimeType: String?, contentLength: Int64,
+                suggestedFilename: String?, textEncodingName: String?) {
+        self.url = url
+        self.userAgent = userAgent
+        self.contentDisposition = contentDisposition
+        self.mimeType = mimeType
+        self.contentLength = contentLength
+        self.suggestedFilename = suggestedFilename
+        self.textEncodingName = textEncodingName
+    }
+    
+    public func toMap () -> [String:Any?] {
+        return [
+            "url": url,
+            "userAgent": userAgent,
+            "contentDisposition": contentDisposition,
+            "mimeType": mimeType,
+            "contentLength": contentLength,
+            "suggestedFilename": suggestedFilename,
+            "textEncodingName": textEncodingName
+        ]
+    }
+}

lib/src/in_app_browser/in_app_browser.dart

@@ -377,16 +377,21 @@ class InAppBrowser {
   ///**Official iOS API**: https://developer.apple.com/documentation/uikit/uiscrollviewdelegate/1619392-scrollviewdidscroll
   void onScrollChanged(int x, int y) {}
 
-  ///Event fired when [InAppBrowser] recognizes and starts a downloadable file.
+  ///Use [onDownloadStartRequest] instead
+  @Deprecated('Use `onDownloadStartRequest` instead')
+  void onDownloadStart(Uri url) {}
+
+  ///Event fired when [WebView] recognizes a downloadable file.
+  ///To download the file, you can use the [flutter_downloader](https://pub.dev/packages/flutter_downloader) plugin.
   ///
-  ///[url] represents the url of the file.
+  ///[downloadStartRequest] represents the request of the file to download.
   ///
   ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useOnDownloadStart] option to `true`.
   ///
   ///**Official Android API**: https://developer.android.com/reference/android/webkit/WebView#setDownloadListener(android.webkit.DownloadListener)
   ///
   ///**Official iOS API**: https://developer.apple.com/documentation/webkit/wknavigationdelegate/1455643-webview
-  void onDownloadStart(Uri url, String userAgent, String contentDisposition, String mimeType, int contentLength) {}
+  void onDownloadStartRequest(DownloadStartRequest downloadStartRequest) {}
 
   ///Event fired when the [InAppBrowser] webview finds the `custom-scheme` while loading a resource. Here you can handle the url request and return a [CustomSchemeResponse] to load a specific resource encoded to `base64`.
   ///

lib/src/in_app_webview/headless_in_app_webview.dart

@@ -64,7 +64,8 @@ class HeadlessInAppWebView implements WebView {
       this.shouldOverrideUrlLoading,
       this.onLoadResource,
       this.onScrollChanged,
-      this.onDownloadStart,
+      @Deprecated('Use `onDownloadStartRequest` instead') this.onDownloadStart,
+      this.onDownloadStartRequest,
       this.onLoadResourceCustomScheme,
       this.onCreateWindow,
       this.onCloseWindow,
@@ -301,14 +302,15 @@ class HeadlessInAppWebView implements WebView {
   @override
   void Function(InAppWebViewController controller)? onWindowBlur;
 
+  ///Use [onDownloadStartRequest] instead
+  @Deprecated('Use `onDownloadStartRequest` instead')
   @override
-  void Function(
+  final void Function(InAppWebViewController controller, Uri url)?
-      InAppWebViewController controller,
+  onDownloadStart;
-      Uri url,
+
-      String userAgent,
+  @override
-      String contentDisposition,
+  final void Function(InAppWebViewController controller, DownloadStartRequest downloadStartRequest)?
-      String mimeType,
+  onDownloadStartRequest;
-      int contentLength)? onDownloadStart;
 
   @override
   void Function(InAppWebViewController controller, int activeMatchOrdinal,

lib/src/in_app_webview/in_app_webview.dart

@@ -53,7 +53,8 @@ class InAppWebView extends StatefulWidget implements WebView {
     this.shouldOverrideUrlLoading,
     this.onLoadResource,
     this.onScrollChanged,
-    this.onDownloadStart,
+    @Deprecated('Use `onDownloadStartRequest` instead') this.onDownloadStart,
+    this.onDownloadStartRequest,
     this.onLoadResourceCustomScheme,
     this.onCreateWindow,
     this.onCloseWindow,
@@ -211,10 +212,16 @@ class InAppWebView extends StatefulWidget implements WebView {
           InAppWebViewController controller, Uri url, bool precomposed)?
       androidOnReceivedTouchIconUrl;
 
+  ///Use [onDownloadStartRequest] instead
+  @Deprecated('Use `onDownloadStartRequest` instead')
   @override
-  final void Function(InAppWebViewController controller, Uri url, String userAgent, String contentDisposition, String mimeType, int contentLength)?
+  final void Function(InAppWebViewController controller, Uri url)?
       onDownloadStart;
 
+  @override
+  final void Function(InAppWebViewController controller, DownloadStartRequest downloadStartRequest)?
+    onDownloadStartRequest;
+
   @override
   final void Function(InAppWebViewController controller, int activeMatchOrdinal,
       int numberOfMatches, bool isDoneCounting)? onFindResultReceived;

lib/src/in_app_webview/in_app_webview_controller.dart

@@ -201,20 +201,26 @@ class InAppWebViewController {
             _inAppBrowser!.onScrollChanged(x, y);
         }
         break;
-      case "onDownloadStart":
+      case "onDownloadStartRequest":
-        if ((_webview != null && _webview!.onDownloadStart != null) ||
+        if ((_webview != null &&
+            // ignore: deprecated_member_use_from_same_package
+            (_webview!.onDownloadStart != null || _webview!.onDownloadStartRequest != null)) ||
             _inAppBrowser != null) {
-          String url = call.arguments["url"];
+          Map<String, dynamic> arguments = call.arguments.cast<String, dynamic>();
-          String userAgent = call.arguments["userAgent"];
+          DownloadStartRequest downloadStartRequest = DownloadStartRequest.fromMap(arguments)!;
-          String contentDisposition = call.arguments["contentDisposition"];
-          String mimeType = call.arguments["mimetype"];
-          int contentLength = call.arguments["contentLength"] as int;
-          Uri uri = Uri.parse(url);
 
-          if (_webview != null && _webview!.onDownloadStart != null)
+          if (_webview != null) {
-            _webview!.onDownloadStart!(this, uri, userAgent, contentDisposition, mimeType, contentLength);
+            if (_webview!.onDownloadStartRequest != null)
-          else
+              _webview!.onDownloadStartRequest!(this, downloadStartRequest);
-            _inAppBrowser!.onDownloadStart(uri, userAgent, contentDisposition, mimeType, contentLength);
+            else {
+              // ignore: deprecated_member_use_from_same_package
+              _webview!.onDownloadStart!(this, downloadStartRequest.url);
+            }
+          } else {
+            // ignore: deprecated_member_use_from_same_package
+            _inAppBrowser!.onDownloadStart(downloadStartRequest.url);
+            _inAppBrowser!.onDownloadStartRequest(downloadStartRequest);
+          }
         }
         break;
       case "onLoadResourceCustomScheme":
@@ -380,6 +386,7 @@ class InAppWebViewController {
           } else {
             // ignore: deprecated_member_use_from_same_package
             _inAppBrowser!.androidOnScaleChanged(oldScale, newScale);
+            _inAppBrowser!.onZoomScaleChanged(oldScale, newScale);
           }
         }
         break;

lib/src/in_app_webview/webview.dart

@@ -112,18 +112,23 @@ abstract class WebView {
   final void Function(InAppWebViewController controller, int x, int y)?
       onScrollChanged;
 
+  ///Use [onDownloadStartRequest] instead
+  @Deprecated('Use `onDownloadStartRequest` instead')
+  final void Function(InAppWebViewController controller, Uri url)?
+      onDownloadStart;
+
   ///Event fired when [WebView] recognizes a downloadable file.
   ///To download the file, you can use the [flutter_downloader](https://pub.dev/packages/flutter_downloader) plugin.
   ///
-  ///[url] represents the url of the file.
+  ///[downloadStartRequest] represents the request of the file to download.
   ///
   ///**NOTE**: In order to be able to listen this event, you need to set [InAppWebViewOptions.useOnDownloadStart] option to `true`.
   ///
   ///**Official Android API**: https://developer.android.com/reference/android/webkit/WebView#setDownloadListener(android.webkit.DownloadListener)
   ///
   ///**Official iOS API**: https://developer.apple.com/documentation/webkit/wknavigationdelegate/1455643-webview
-  final void Function(InAppWebViewController controller, Uri url, String userAgent, String contentDisposition, String mimeType, int contentLength)?
+  final void Function(InAppWebViewController controller, DownloadStartRequest downloadStartRequest)?
-      onDownloadStart;
+    onDownloadStartRequest;
 
   ///Event fired when the [WebView] finds the `custom-scheme` while loading a resource. Here you can handle the url request and return a [CustomSchemeResponse] to load a specific resource encoded to `base64`.
   ///
@@ -696,7 +701,8 @@ abstract class WebView {
       this.shouldOverrideUrlLoading,
       this.onLoadResource,
       this.onScrollChanged,
-      this.onDownloadStart,
+      @Deprecated('Use `onDownloadStartRequest` instead') this.onDownloadStart,
+      this.onDownloadStartRequest,
       this.onLoadResourceCustomScheme,
       this.onCreateWindow,
       this.onCloseWindow,

lib/src/types.dart

@@ -6891,4 +6891,73 @@ class WebViewImplementation {
 
   @override
   int get hashCode => _value.hashCode;
+}
+
+///Class representing a download request of the WebView used by the event [WebView.onDownloadStartRequest].
+class DownloadStartRequest {
+  ///The full url to the content that should be downloaded.
+  Uri url;
+
+  ///the user agent to be used for the download.
+  String? userAgent;
+
+  ///Content-disposition http header, if present.
+  String? contentDisposition;
+
+  ///The mimetype of the content reported by the server.
+  String? mimeType;
+
+  ///The file size reported by the server.
+  int contentLength;
+
+  ///A suggested filename to use if saving the resource to disk.
+  String? suggestedFilename;
+
+  ///The name of the text encoding of the receiver, or `null` if no text encoding was specified.
+  String? textEncodingName;
+
+  DownloadStartRequest(
+      {required this.url,
+        this.userAgent,
+        this.contentDisposition,
+        this.mimeType,
+        required this.contentLength,
+        this.suggestedFilename,
+        this.textEncodingName});
+
+  static DownloadStartRequest? fromMap(Map<String, dynamic>? map) {
+    if (map == null) {
+      return null;
+    }
+
+    return DownloadStartRequest(
+        url: Uri.parse(map["url"]),
+        userAgent: map["userAgent"],
+        contentDisposition: map["contentDisposition"],
+        mimeType: map["mimeType"],
+        contentLength: map["contentLength"],
+        suggestedFilename: map["suggestedFilename"],
+        textEncodingName: map["textEncodingName"]);
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      "url": url.toString(),
+      "userAgent": userAgent,
+      "contentDisposition": contentDisposition,
+      "mimeType": mimeType,
+      "contentLength": contentLength,
+      "suggestedFilename": suggestedFilename,
+      "textEncodingName": textEncodingName
+    };
+  }
+
+  Map<String, dynamic> toJson() {
+    return this.toMap();
+  }
+
+  @override
+  String toString() {
+    return toMap().toString();
+  }
 }