Add setting to control the casing of material3 text

lib/src/platform_provider.dart

@@ -152,12 +152,19 @@ class PlatformSettingsData {
   /// Set to true (wrapped) by default which could be a breaking change. If it is then set this value to false
   final bool wrapCupertinoAppBarMiddleWithMediaQuery;
 
+  /// With Material3 spec defining buttons text as being non ALL CAPS (see https://m3.material.io/components/buttons/overview#388f6096-c34d-4a22-8b1f-11ad69963f7c)
+  /// If this is set to true then using [PlatformText] with material3 style will default to sentence case and not ALL CAPS. Material 2 will continue to be ALL CAPS
+  /// If this is set to false then it will default to previous behavour of ALL CAPS.
+  /// Going forward [PlatformText] will likely be removed when the material3 property on ThemeData is removed and all material widgets will assume material3 style.
+  final bool matchMaterialCaseForPlatformText;
+
   PlatformSettingsData({
     this.iosUsesMaterialWidgets = false,
     this.iosUseZeroPaddingForAppbarPlatformIcon = false,
     this.legacyIosUsesMaterialWidgets = false,
     this.platformStyle = const PlatformStyleData(),
     this.wrapCupertinoAppBarMiddleWithMediaQuery = true,
+    this.matchMaterialCaseForPlatformText = true,
   });
 }
 

lib/src/platform_text.dart

@@ -6,12 +6,27 @@
 
 import 'dart:ui' as ui show TextHeightBehavior;
 
+import 'package:flutter/material.dart' show Theme;
 import 'package:flutter/widgets.dart';
 
 import 'platform.dart' show isMaterial;
+import 'platform_provider.dart' show PlatformProvider;
+import 'platform_theme.dart' show PlatformTheme;
 
 String formatData(BuildContext context, String data) {
   if (isMaterial(context)) {
+    final providerState = PlatformProvider.of(context);
+    final matchMaterialCaseForPlatformText =
+        providerState?.settings.matchMaterialCaseForPlatformText ?? true;
+
+    final m3 = PlatformTheme.of(context)?.isMaterial3 ??
+        Theme.of(context).useMaterial3;
+
+    // If it material3 and we want to match the casing as defined for material3 then do not return ALL CAPS
+    if (m3 && matchMaterialCaseForPlatformText) {
+      return data;
+    }
+
     return data.toUpperCase();
   }
   return data;

lib/src/platform_theme.dart

@@ -118,6 +118,10 @@ class _PlatformThemeState extends State<PlatformTheme>
         applyToBothDarkAndLightTheme: applyToBothDarkAndLightTheme);
   }
 
+  bool get isMaterial3 =>
+      (isDark ? _materialDarkTheme : _materialLightTheme)?.useMaterial3 ??
+      false;
+
   void _setMaterialThemeType({
     required bool? useMaterial3,
     bool applyToBothDarkAndLightTheme = false,
@@ -167,6 +171,7 @@ class PlatformThemeState {
   set themeMode(ThemeMode? themeMode) => _parent.themeMode = themeMode;
 
   bool get isDark => _parent.isDark;
+  bool get isMaterial3 => _parent.isMaterial3;
 
   CupertinoThemeData? get cupertinoLightTheme => _parent._cupertinoLightTheme;
   CupertinoThemeData? get cupertinoDarkTheme => _parent._cupertinoDarkTheme;