[fix] ios-dark-mode-content-issue

ios/Podfile.lock

@@ -1,64 +1,26 @@
 PODS:
   - Flutter (1.0.0)
-  - integration_test (0.0.1):
-    - Flutter
   - open_filex (0.0.2):
     - Flutter
-  - package_info_plus (0.4.5):
-    - Flutter
-  - path_provider_foundation (0.0.1):
-    - Flutter
-    - FlutterMacOS
-  - share_plus (0.0.1):
-    - Flutter
-  - shared_preferences_foundation (0.0.1):
-    - Flutter
-    - FlutterMacOS
-  - url_launcher_ios (0.0.1):
-    - Flutter
   - workmanager_apple (0.0.1):
     - Flutter
 
 DEPENDENCIES:
   - Flutter (from `Flutter`)
-  - integration_test (from `.symlinks/plugins/integration_test/ios`)
   - open_filex (from `.symlinks/plugins/open_filex/ios`)
-  - package_info_plus (from `.symlinks/plugins/package_info_plus/ios`)
-  - path_provider_foundation (from `.symlinks/plugins/path_provider_foundation/darwin`)
-  - share_plus (from `.symlinks/plugins/share_plus/ios`)
-  - shared_preferences_foundation (from `.symlinks/plugins/shared_preferences_foundation/darwin`)
-  - url_launcher_ios (from `.symlinks/plugins/url_launcher_ios/ios`)
   - workmanager_apple (from `.symlinks/plugins/workmanager_apple/ios`)
 
 EXTERNAL SOURCES:
   Flutter:
     :path: Flutter
-  integration_test:
-    :path: ".symlinks/plugins/integration_test/ios"
   open_filex:
     :path: ".symlinks/plugins/open_filex/ios"
-  package_info_plus:
-    :path: ".symlinks/plugins/package_info_plus/ios"
-  path_provider_foundation:
-    :path: ".symlinks/plugins/path_provider_foundation/darwin"
-  share_plus:
-    :path: ".symlinks/plugins/share_plus/ios"
-  shared_preferences_foundation:
-    :path: ".symlinks/plugins/shared_preferences_foundation/darwin"
-  url_launcher_ios:
-    :path: ".symlinks/plugins/url_launcher_ios/ios"
   workmanager_apple:
     :path: ".symlinks/plugins/workmanager_apple/ios"
 
 SPEC CHECKSUMS:
   Flutter: cabc95a1d2626b1b06e7179b784ebcf0c0cde467
-  integration_test: 4a889634ef21a45d28d50d622cf412dc6d9f586e
   open_filex: 432f3cd11432da3e39f47fcc0df2b1603854eff1
-  package_info_plus: af8e2ca6888548050f16fa2f1938db7b5a5df499
-  path_provider_foundation: bb55f6dbba17d0dccd6737fe6f7f34fbd0376880
-  share_plus: 50da8cb520a8f0f65671c6c6a99b3617ed10a58a
-  shared_preferences_foundation: 7036424c3d8ec98dfe75ff1667cb0cd531ec82bb
-  url_launcher_ios: 7a95fa5b60cc718a708b8f2966718e93db0cef1b
   workmanager_apple: 904529ae31e97fc5be632cf628507652294a0778
 
 PODFILE CHECKSUM: ec1ad48fafee7989ae02b93f14e4d03d1f0e05bb

ios/Runner.xcodeproj/project.pbxproj

@@ -10,6 +10,7 @@
 		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
 		74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74858FAE1ED2DC5600515810 /* AppDelegate.swift */; };
+		78A318202AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage in Frameworks */ = {isa = PBXBuildFile; productRef = 78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */; };
 		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
 		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
 		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
@@ -38,6 +39,7 @@
 		4CC19D185F571E45AC7BB4FF /* Pods-Runner.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.debug.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"; sourceTree = "<group>"; };
 		74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Runner-Bridging-Header.h"; sourceTree = "<group>"; };
 		74858FAE1ED2DC5600515810 /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
+		78E0A7A72DC9AD7400C4905E /* FlutterGeneratedPluginSwiftPackage */ = {isa = PBXFileReference; lastKnownFileType = wrapper; name = FlutterGeneratedPluginSwiftPackage; path = Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
 		9740EEB21CF90195004384FC /* Debug.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Debug.xcconfig; path = Flutter/Debug.xcconfig; sourceTree = "<group>"; };
 		9740EEB31CF90195004384FC /* Generated.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Generated.xcconfig; path = Flutter/Generated.xcconfig; sourceTree = "<group>"; };
@@ -56,6 +58,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				78A318202AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage in Frameworks */,
 				D0190EC4023141C93A5318E8 /* Pods_Runner.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -84,6 +87,7 @@
 		9740EEB11CF90186004384FC /* Flutter */ = {
 			isa = PBXGroup;
 			children = (
+				78E0A7A72DC9AD7400C4905E /* FlutterGeneratedPluginSwiftPackage */,
 				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
 				9740EEB21CF90195004384FC /* Debug.xcconfig */,
 				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
@@ -148,6 +152,9 @@
 			dependencies = (
 			);
 			name = Runner;
+			packageProductDependencies = (
+				78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */,
+			);
 			productName = Runner;
 			productReference = 97C146EE1CF9000F007C117D /* Runner.app */;
 			productType = "com.apple.product-type.application";
@@ -176,6 +183,9 @@
 				Base,
 			);
 			mainGroup = 97C146E51CF9000F007C117D;
+			packageReferences = (
+				781AD8BC2B33823900A9FFBB /* XCLocalSwiftPackageReference "FlutterGeneratedPluginSwiftPackage" */,
+			);
 			productRefGroup = 97C146EF1CF9000F007C117D /* Products */;
 			projectDirPath = "";
 			projectRoot = "";
@@ -209,14 +219,10 @@
 			inputFileListPaths = (
 				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-input-files.xcfilelist",
 			);
-			inputPaths = (
-			);
 			name = "[CP] Embed Pods Frameworks";
 			outputFileListPaths = (
 				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-output-files.xcfilelist",
 			);
-			outputPaths = (
-			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
 			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
@@ -365,7 +371,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
-				CURRENT_PROJECT_VERSION = 11;
+				CURRENT_PROJECT_VERSION = 1;
 				DEVELOPMENT_TEAM = 78WP6ZX639;
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = Runner/Info.plist;
@@ -375,7 +381,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 0.8.7;
+				MARKETING_VERSION = 0.8.8;
 				PRODUCT_BUNDLE_IDENTIFIER = net.4training.app;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator";
@@ -502,7 +508,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
-				CURRENT_PROJECT_VERSION = 11;
+				CURRENT_PROJECT_VERSION = 1;
 				DEVELOPMENT_TEAM = 78WP6ZX639;
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = Runner/Info.plist;
@@ -512,7 +518,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 0.8.7;
+				MARKETING_VERSION = 0.8.8;
 				PRODUCT_BUNDLE_IDENTIFIER = net.4training.app;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator";
@@ -533,7 +539,7 @@
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
-				CURRENT_PROJECT_VERSION = 11;
+				CURRENT_PROJECT_VERSION = 1;
 				DEVELOPMENT_TEAM = 78WP6ZX639;
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = Runner/Info.plist;
@@ -543,7 +549,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 0.8.7;
+				MARKETING_VERSION = 0.8.8;
 				PRODUCT_BUNDLE_IDENTIFIER = net.4training.app;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator";
@@ -581,6 +587,20 @@
 			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
+
+/* Begin XCLocalSwiftPackageReference section */
+		781AD8BC2B33823900A9FFBB /* XCLocalSwiftPackageReference "FlutterGeneratedPluginSwiftPackage" */ = {
+			isa = XCLocalSwiftPackageReference;
+			relativePath = Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage;
+		};
+/* End XCLocalSwiftPackageReference section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = FlutterGeneratedPluginSwiftPackage;
+		};
+/* End XCSwiftPackageProductDependency section */
 	};
 	rootObject = 97C146E61CF9000F007C117D /* Project object */;
 }

ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -5,6 +5,24 @@
    <BuildAction
       parallelizeBuildables = "YES"
       buildImplicitDependencies = "YES">
+      <PreActions>
+         <ExecutionAction
+            ActionType = "Xcode.IDEStandardExecutionActionsCore.ExecutionActionType.ShellScriptAction">
+            <ActionContent
+               title = "Run Prepare Flutter Framework Script"
+               scriptText = "/bin/sh &quot;$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh&quot; prepare&#10;">
+               <EnvironmentBuildable>
+                  <BuildableReference
+                     BuildableIdentifier = "primary"
+                     BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+                     BuildableName = "Runner.app"
+                     BlueprintName = "Runner"
+                     ReferencedContainer = "container:Runner.xcodeproj">
+                  </BuildableReference>
+               </EnvironmentBuildable>
+            </ActionContent>
+         </ExecutionAction>
+      </PreActions>
       <BuildActionEntries>
          <BuildActionEntry
             buildForTesting = "YES"

lib/widgets/html_view.dart

@@ -1,3 +1,4 @@
+import 'package:app4training/widgets/invertible_image_builtin.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_html/flutter_html.dart';
 import 'package:flutter_html_table/flutter_html_table.dart';
@@ -17,6 +18,7 @@ class HtmlView extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final bool isDarkMode = Theme.of(context).brightness == Brightness.dark;
     return Padding(
       padding: const EdgeInsets.all(8),
       child: SingleChildScrollView(
@@ -28,11 +30,11 @@ class HtmlView extends StatelessWidget {
                 //            child: Html(
                 //                data: content,
                 child: Html.fromDom(
-                  document: sanitize(
-                    content,
-                    MediaQuery.of(context).platformBrightness ==
-                        Brightness.dark,
-                  ),
+                  // The theme's brightness (not the platform brightness)
+                  // is the canonical dark-mode source for this widget:
+                  // the sanitize pass and the image inversion must flip
+                  // together with the widget colors.
+                  document: sanitize(content, isDarkMode),
                   extensions: [
                     // Order matters: TagWrapExtension must come BEFORE
                     // TableHtmlExtension so it matches <table> first
@@ -63,6 +65,15 @@ class HtmlView extends StatelessWidget {
                       builder: (child) => _HorizontalTableScroll(child: child),
                     ),
                     const TableHtmlExtension(),
+                    // Renders images like the built-in renderer, but
+                    // inverts their colors (keeping hue) in dark mode so
+                    // black-on-transparent drawings stay visible.
+                    // Deliberately a subclass of the built-in image
+                    // renderer and not a TagWrapExtension: at build time
+                    // TagWrapExtension matches any wrapper element,
+                    // which would collide with the table wrapper above
+                    // under first-match-wins dispatch.
+                    InvertibleImageBuiltIn(invert: isDarkMode),
                   ],
                   style: {
                     "body": Style(fontSize: FontSize(15)),

lib/widgets/invertible_image_builtin.dart

@@ -0,0 +1,54 @@
+// ImageBuiltIn is not exported by package:flutter_html/flutter_html.dart,
+// only reachable via this implementation import. flutter_html's own
+// ImageExtension helper subclasses it through the same import, but its
+// builder API *replaces* the built-in rendering instead of wrapping it,
+// so it can't be used to filter the widget the built-in builds.
+// ignore_for_file: implementation_imports
+import 'package:flutter/material.dart';
+import 'package:flutter_html/flutter_html.dart';
+import 'package:flutter_html/src/builtins/image_builtin.dart';
+
+/// Renders `<img>` elements exactly like flutter_html's built-in image
+/// renderer, optionally drawing the image through a hue-preserving color
+/// inversion for dark mode: black becomes white, grays flip lightness,
+/// transparency passes through unchanged and colored artwork keeps its
+/// hue with lightness flipped.
+///
+/// With [invert] false the built-in rendering is returned unchanged —
+/// no wrapper widget is added at all.
+class InvertibleImageBuiltIn extends ImageBuiltIn {
+  final bool invert;
+
+  const InvertibleImageBuiltIn({required this.invert});
+
+  @override
+  InlineSpan build(ExtensionContext context) {
+    final span = super.build(context);
+    if (!invert || span is! WidgetSpan) {
+      // Light mode stays untouched; so do images the built-in renderer
+      // can't decode (super returns a plain TextSpan with the alt text).
+      return span;
+    }
+    return WidgetSpan(
+      alignment: span.alignment,
+      baseline: span.baseline,
+      style: span.style,
+      child: ColorFiltered(
+        colorFilter: const ColorFilter.matrix(_invertKeepHueMatrix),
+        child: span.child,
+      ),
+    );
+  }
+}
+
+/// Color inversion that keeps hues, like CSS
+/// `filter: invert(1) hue-rotate(180deg)` ("smart invert"):
+/// black -> white, grays invert exactly (each row sums to -1, plus the
+/// 255 offset), alpha is untouched (last row) and colors keep their hue
+/// with flipped lightness.
+const List<double> _invertKeepHueMatrix = [
+  0.574, -1.430, -0.144, 0, 255, //
+  -0.426, -0.430, -0.144, 0, 255, //
+  -0.426, -1.430, 0.856, 0, 255, //
+  0, 0, 0, 1, 0,
+];

pubspec.lock

@@ -496,10 +496,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
+      sha256: "1741988757a65eb6b36abe716829688cf01910bbf91c34354ff7ec1c3de2b349"
       url: "https://pub.dev"
     source: hosted
-    version: "1.17.0"
+    version: "1.18.0"
   mime:
     dependency: transitive
     description:
@@ -893,26 +893,26 @@ packages:
     dependency: "direct dev"
     description:
       name: test
-      sha256: "280d6d890011ca966ad08df7e8a4ddfab0fb3aa49f96ed6de56e3521347a9ae7"
+      sha256: "8d9ceddbab833f180fbefed08afa76d7c03513dfdba87ffcec2718b02bbcbf20"
       url: "https://pub.dev"
     source: hosted
-    version: "1.30.0"
+    version: "1.31.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      sha256: "8161c84903fd860b26bfdefb7963b3f0b68fee7adea0f59ef805ecca346f0c7a"
+      sha256: "949a932224383300f01be9221c39180316445ecb8e7547f70a41a35bf421fb9e"
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.10"
+    version: "0.7.11"
   test_core:
     dependency: transitive
     description:
       name: test_core
-      sha256: "0381bd1585d1a924763c308100f2138205252fb90c9d4eeaf28489ee65ccde51"
+      sha256: "1991d4cfe85d5043241acac92962c3977c8d2f2add1ee73130c7b286417d1d34"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.16"
+    version: "0.6.17"
   typed_data:
     dependency: transitive
     description: