💄 Use SystemUiOverlayStyle from the provided theme first (#138)

Co-authored-by: Alex Li <[email protected]>

Author: NaikSoftware

lib/src/constants/extensions.dart

@@ -6,14 +6,20 @@ import 'package:flutter/material.dart';
 
 extension BuildContextExtension on BuildContext {
   MediaQueryData get mediaQuery => MediaQuery.of(this);
+
   ThemeData get themeData => Theme.of(this);
 }
 
 extension BrightnessExtension on Brightness {
   bool get isDark => this == Brightness.dark;
+
   bool get isLight => this == Brightness.light;
 }
 
 extension ColorExtension on Color {
   bool get isTransparent => this == Colors.transparent;
 }
+
+extension ThemeDataExtension on ThemeData {
+  Brightness get effectiveBrightness => appBarTheme.brightness ?? brightness;
+}

lib/src/delegates/asset_picker_builder_delegate.dart

@@ -92,9 +92,11 @@ abstract class AssetPickerBuilderDelegate<A, P> {
   /// Return a system ui overlay style according to
   /// the brightness of the theme data.
   /// 根据主题返回状态栏的明暗样式
-  SystemUiOverlayStyle get overlayStyle => theme.brightness == Brightness.light
-      ? SystemUiOverlayStyle.dark
-      : SystemUiOverlayStyle.light;
+  SystemUiOverlayStyle get overlayStyle =>
+      theme.appBarTheme.systemOverlayStyle ??
+      (theme.effectiveBrightness.isDark
+          ? SystemUiOverlayStyle.light
+          : SystemUiOverlayStyle.dark);
 
   /// Whether the current platform is Apple OS.
   /// 当前平台是否苹果系列系统 (iOS & MacOS)

lib/src/delegates/asset_picker_viewer_builder_delegate.dart

@@ -756,9 +756,10 @@ class DefaultAssetPickerViewerBuilderDelegate
       child: Theme(
         data: themeData,
         child: AnnotatedRegion<SystemUiOverlayStyle>(
-          value: themeData.brightness.isDark
-              ? SystemUiOverlayStyle.light
-              : SystemUiOverlayStyle.dark,
+          value: themeData.appBarTheme.systemOverlayStyle ??
+              (themeData.effectiveBrightness.isDark
+                  ? SystemUiOverlayStyle.light
+                  : SystemUiOverlayStyle.dark),
           child: Material(
             color: Colors.black,
             child: Stack(

lib/src/widget/fixed_appbar.dart

@@ -146,11 +146,12 @@ class FixedAppBar extends StatelessWidget implements PreferredSizeWidget {
       );
     }
 
+    final ThemeData themeData = Theme.of(context);
     return AnnotatedRegion<SystemUiOverlayStyle>(
-      value:
-          (Theme.of(context).appBarTheme.brightness ?? Brightness.dark).isDark
+      value: themeData.appBarTheme.systemOverlayStyle ??
+          (themeData.effectiveBrightness.isDark
               ? SystemUiOverlayStyle.light
-              : SystemUiOverlayStyle.dark,
+              : SystemUiOverlayStyle.dark),
       child: Material(
         type: color.isTransparent
             ? MaterialType.transparency