TF-3601 Fix preview EML file with long content in iOS

Signed-off-by: dab246 <tdvu@linagora.com>
2025-03-31 03:45:05 +07:00
parent d01618c32e
commit 1c97c8a189
3 changed files with 203 additions and 15 deletions
@@ -0,0 +1,102 @@
+import 'dart:async';
+
+import 'package:core/data/constants/constant.dart';
+import 'package:core/presentation/views/html_viewer/html_content_viewer_widget.dart';
+import 'package:core/utils/html/html_interaction.dart';
+import 'package:core/utils/html/html_utils.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/gestures.dart';
+import 'package:flutter_inappwebview/flutter_inappwebview.dart';
+import 'package:url_launcher/url_launcher.dart' as launcher;
+import 'package:url_launcher/url_launcher_string.dart';
+
+class IosHtmlContentViewerWidget extends StatefulWidget {
+
+  final String contentHtml;
+  final TextDirection? direction;
+  final bool useDefaultFont;
+  final OnMailtoDelegateAction? onMailtoDelegateAction;
+  final OnPreviewEMLDelegateAction? onPreviewEMLDelegateAction;
+  final OnDownloadAttachmentDelegateAction? onDownloadAttachmentDelegateAction;
+
+  const IosHtmlContentViewerWidget({
+    Key? key,
+    required this.contentHtml,
+    this.direction,
+    this.useDefaultFont = false,
+    this.onMailtoDelegateAction,
+    this.onPreviewEMLDelegateAction,
+    this.onDownloadAttachmentDelegateAction,
+  }) : super(key: key);
+
+  @override
+  State<StatefulWidget> createState() => _IosHtmlContentViewerWidgetState();
+}
+
+class _IosHtmlContentViewerWidgetState extends State<IosHtmlContentViewerWidget> {
+
+  @override
+  Widget build(BuildContext context) {
+    return InAppWebView(
+      initialSettings: InAppWebViewSettings(transparentBackground: true),
+      onWebViewCreated: _onWebViewCreated,
+      shouldOverrideUrlLoading: _shouldOverrideUrlLoading,
+      gestureRecognizers: {
+        Factory<LongPressGestureRecognizer>(() => LongPressGestureRecognizer()),
+      },
+    );
+  }
+
+  Future<void> _onWebViewCreated(InAppWebViewController controller) async {
+    await controller.loadData(data: HtmlUtils.generateHtmlDocument(
+      content: widget.contentHtml,
+      direction: widget.direction,
+      javaScripts: HtmlInteraction.scriptsHandleLazyLoadingBackgroundImage,
+      useDefaultFont: widget.useDefaultFont,
+    ));
+  }
+
+  Future<NavigationActionPolicy?> _shouldOverrideUrlLoading(
+    InAppWebViewController controller,
+    NavigationAction navigationAction
+  ) async {
+    final url = navigationAction.request.url?.toString();
+
+    if (url == null) {
+      return NavigationActionPolicy.CANCEL;
+    }
+
+    if (navigationAction.isForMainFrame && url == 'about:blank') {
+      return NavigationActionPolicy.ALLOW;
+    }
+
+    final requestUri = Uri.parse(url);
+    if (widget.onMailtoDelegateAction != null &&
+        requestUri.isScheme(Constant.mailtoScheme)) {
+      await widget.onMailtoDelegateAction?.call(requestUri);
+      return NavigationActionPolicy.CANCEL;
+    }
+
+    if (widget.onPreviewEMLDelegateAction != null &&
+        requestUri.isScheme(Constant.emlPreviewerScheme)) {
+      await widget.onPreviewEMLDelegateAction?.call(requestUri);
+      return NavigationActionPolicy.CANCEL;
+    }
+
+    if (widget.onDownloadAttachmentDelegateAction != null &&
+        requestUri.isScheme(Constant.attachmentScheme)) {
+      await widget.onDownloadAttachmentDelegateAction?.call(requestUri);
+      return NavigationActionPolicy.CANCEL;
+    }
+
+    if (await launcher.canLaunchUrl(Uri.parse(url))) {
+      await launcher.launchUrl(
+        Uri.parse(url),
+        mode: LaunchMode.externalApplication
+      );
+    }
+
+    return NavigationActionPolicy.CANCEL;
+  }
+}