feat: add secondary button builder

packages/flutter_availability/lib/src/config/availability_options.dart

@@ -14,6 +14,7 @@ class AvailabilityOptions {
     this.translations = const AvailabilityTranslations.empty(),
     this.baseScreenBuilder = DefaultBaseScreen.builder,
     this.primaryButtonBuilder = DefaultPrimaryButton.builder,
+    this.secondaryButtonBuilder = DefaultSecondaryButton.builder,
     this.textButtonBuilder = DefaultTextButton.builder,
     this.spacing = const AvailabilitySpacing(),
     this.textStyles = const AvailabilityTextStyles(),
@@ -39,6 +40,9 @@ class AvailabilityOptions {
   /// A way to provide your own primary button implementation
   final ButtonBuilder primaryButtonBuilder;
 
+  /// A way to provide your own secondary button implementation
+  final ButtonBuilder secondaryButtonBuilder;
+
   /// A way to provide your own text button implementation
   final ButtonBuilder textButtonBuilder;
 

packages/flutter_availability/lib/src/ui/widgets/default_buttons.dart

@@ -33,6 +33,37 @@ class DefaultPrimaryButton extends StatelessWidget {
       FilledButton(onPressed: onPressed, child: child);
 }
 
+/// a secondary button with a an outlined border
+class DefaultSecondaryButton extends StatelessWidget {
+  ///
+  const DefaultSecondaryButton({
+    required this.child,
+    required this.onPressed,
+    super.key,
+  });
+
+  ///
+  static Widget builder(
+    BuildContext context,
+    FutureOr<void> Function()? onPressed,
+    Widget child,
+  ) =>
+      DefaultSecondaryButton(
+        onPressed: onPressed,
+        child: child,
+      );
+
+  ///
+  final Widget child;
+
+  ///
+  final FutureOr<void> Function()? onPressed;
+
+  @override
+  Widget build(BuildContext context) =>
+      OutlinedButton(onPressed: onPressed, child: child);
+}
+
 ///
 class DefaultTextButton extends StatelessWidget {
   ///