decoupled business logic from ui

lib/src/dialog/dialog_button.dart

@@ -0,0 +1,62 @@
+import 'package:fluent_ui/fluent_ui.dart';
+
+class DialogButton extends StatefulWidget {
+  final String? text;
+  final Function()? onTap;
+  final ButtonType type;
+
+  const DialogButton(
+      {Key? key,
+        this.text,
+        this.onTap,
+        required this.type})
+      : assert(type != ButtonType.primary || onTap != null,
+        "OnTap handler cannot be null for primary buttons"),
+        assert(type != ButtonType.primary || text != null,
+        "Text cannot be null for primary buttons"),
+        super(key: key);
+
+  @override
+  State<DialogButton> createState() => _DialogButtonState();
+}
+
+class _DialogButtonState extends State<DialogButton> {
+  @override
+  Widget build(BuildContext context) {
+    return widget.type == ButtonType.only ? _createOnlyButton() : _createButton();
+  }
+
+  SizedBox _createOnlyButton() {
+    return SizedBox(
+        width: double.infinity,
+        child: _createButton()
+    );
+  }
+
+  Widget _createButton() {
+    return widget.type == ButtonType.primary ? _createPrimaryActionButton()
+      : _createSecondaryActionButton();
+  }
+
+  Widget _createPrimaryActionButton() {
+    return FilledButton(
+      onPressed: widget.onTap!,
+      child: Text(widget.text!),
+    );
+  }
+
+  Widget _createSecondaryActionButton() {
+    return Button(
+      onPressed: widget.onTap ?? _onDefaultSecondaryActionTap,
+      child: Text(widget.text ?? "Close"),
+    );
+  }
+
+  void _onDefaultSecondaryActionTap() => Navigator.of(context).pop(null);
+}
+
+enum ButtonType {
+  primary,
+  secondary,
+  only
+}