Make CupertinoAlertDialog clearly visible in dark mode #80921

import 'package:flutter/cupertino.dart'
    show
    showCupertinoDialog,
    CupertinoAlertDialog,
    CupertinoApp,
    CupertinoButton,
    CupertinoDialogAction,
    CupertinoNavigationBar,
    CupertinoPage,
    CupertinoPageScaffold,
    CupertinoTheme,
    CupertinoThemeData;
import 'package:flutter/foundation.dart'
    show
    debugBrightnessOverride,
    kReleaseMode;
import 'package:flutter/widgets.dart'
    show
    runApp,
    Builder,
    BuildContext,
    Color,
    DefaultTextStyle,
    Key,
    MediaQuery,
    MediaQueryData,
    Page,
    State,
    StatefulWidget,
    StatelessWidget,
    Text,
    Navigator,
    Widget,
    WidgetsBinding,
    WidgetsBindingObserver;
import 'dart:ui' show Brightness;

// Copied from flutter/lib/src/widgets/app.dart:_MediaQueryFromWindow .
class MediaQueryFromWindow extends StatefulWidget {
  const MediaQueryFromWindow({Key key, this.child}) : super(key: key);

  final Widget child;

  @override
  MediaQueryFromWindowsState createState() => MediaQueryFromWindowsState();
}

class MediaQueryFromWindowsState extends State<MediaQueryFromWindow>
    with WidgetsBindingObserver {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
  }

  @override
  void didChangeAccessibilityFeatures() {
    setState(() {});
  }

  @override
  void didChangeMetrics() {
    setState(() {});
  }

  @override
  void didChangeTextScaleFactor() {
    setState(() {});
  }

  @override
  void didChangePlatformBrightness() {
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    MediaQueryData data = MediaQueryData.fromWindow(
        WidgetsBinding.instance.window);
    if (!kReleaseMode) {
      data = data.copyWith(platformBrightness: debugBrightnessOverride);
    }
    return MediaQuery(
      data: data,
      child: widget.child,
    );
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }
}

Page homePage() =>
    CupertinoPage(
      title: 'Page1',
      child: Builder(builder: (BuildContext ctx) =>
          CupertinoPageScaffold(
            navigationBar: CupertinoNavigationBar(),
            child: CupertinoButton(
              child: Text('Button1'),
              onPressed: () =>
                  showCupertinoDialog(
                    context: ctx,
                    builder: (BuildContext ctx) =>
                        CupertinoAlertDialog(
                          title: Text('Alert1'),
                          content: Text('Content1'),
                          actions: [
                            CupertinoDialogAction(
                              isDefaultAction: false,
                              isDestructiveAction: false,
                              child: Text('Disabled1'),
                            ),
                            CupertinoDialogAction(
                              isDefaultAction: false,
                              isDestructiveAction: false,
                              onPressed: () =>
                                  Navigator.pop(
                                      ctx, false),
                              child: Text('Action1'),
                            ),
                            CupertinoDialogAction(
                              isDefaultAction: false,
                              isDestructiveAction: true,
                              onPressed: () =>
                                  Navigator.pop(
                                      ctx, false),
                              child: Text('Destructive1'),
                            ),
                            CupertinoDialogAction(
                              isDefaultAction: true,
                              isDestructiveAction: false,
                              onPressed: () =>
                                  Navigator.pop(
                                      ctx, false),
                              child: Text('Cancel1'),
                            ),
                          ],
                        ),
                  ),
            ),
          ),
      ),
    );

class AppWidget extends StatelessWidget {
  @override
  Widget build(BuildContext ctx) {
    final isLight = MediaQuery
        .of(ctx)
        .platformBrightness == Brightness.light;
    final cupertinoThemeData = isLight ? CupertinoThemeData(
      // Light
      primaryColor: Color(0xff664600),
      barBackgroundColor: Color(0xffFFF0D0),
    ) : CupertinoThemeData(
      // Dark
      primaryColor: Color(0xffFFF0D0),
      barBackgroundColor: Color(0xff664600),
    );
    return CupertinoApp(
      theme: cupertinoThemeData,
      title: 'App1',
      home: Builder(builder: (BuildContext ctx) =>
          DefaultTextStyle(
            style: CupertinoTheme
                .of(ctx)
                .textTheme
                .textStyle,
            child: Navigator(
              pages: [homePage()],
              onPopPage: (route, result) => true,
            ),
          ),
      ),
    );
  }
}

void main() {
  runApp(MediaQueryFromWindow(child: AppWidget()));
}