Add native dialog to toolkit

lib/ui/native_dialog.dart

@@ -0,0 +1,77 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+/// A native dialog which shows a [CupertinoAlertDialog] on iOS and a [AlertDialog] on Android.
+///
+/// Example:
+/// ```dart
+/// showNativeDialog(
+///   context,
+///   title: 'Title',
+///   content: 'Content',
+///   actions: [
+///     DialogAction(text: 'Action', onTap: () {}),
+///   ],
+/// );
+/// ```
+void showNativeDialog(
+  BuildContext context, {
+  required String title,
+  required List<DialogAction> actions,
+  required String content,
+}) {
+  if (defaultTargetPlatform == TargetPlatform.iOS) {
+    showCupertinoDialog<void>(
+      context: context,
+      builder: (context) => CupertinoAlertDialog(
+        title: Text(title),
+        content: Text(content),
+        actions: actions
+            .map(
+              (action) => CupertinoDialogAction(
+                onPressed: action.onTap,
+                isDestructiveAction: action.isDestructiveAction,
+                child: Text(action.text),
+              ),
+            )
+            .toList(),
+      ),
+    );
+  } else {
+    showDialog<void>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: Text(title),
+        content: Text(content),
+        actions: actions
+            .map(
+              (action) => TextButton(
+                onPressed: action.onTap,
+                child: Text(action.text),
+              ),
+            )
+            .toList(),
+      ),
+    );
+  }
+}
+
+/// A dialog action which is used to show the actions of a native dialog.
+class DialogAction {
+  /// Creates a [DialogAction].
+  const DialogAction({
+    required this.text,
+    required this.onTap,
+    this.isDestructiveAction = false,
+  });
+
+  /// The text of the action.
+  final String text;
+
+  /// The callback that is called when the action is tapped.
+  final VoidCallback onTap;
+
+  /// Whether the action is a destructive action. This is only used on iOS.
+  final bool isDestructiveAction;
+}