improve login and logout

lib/components/button.dart

@@ -0,0 +1,96 @@
+import 'package:fluent_ui/fluent_ui.dart';
+import 'package:pixes/foundation/app.dart';
+
+abstract class BaseButton extends StatelessWidget {
+  const BaseButton({this.enabled = true, this.isLoading = false, super.key});
+
+  final bool enabled;
+
+  final bool isLoading;
+
+  Widget buildNormal(BuildContext context);
+
+  Widget buildLoading(BuildContext context);
+
+  Widget buildDisabled(BuildContext context);
+
+  @override
+  Widget build(BuildContext context) {
+    if (isLoading) {
+      return buildLoading(context);
+    } else if (enabled) {
+      return buildNormal(context);
+    } else {
+      return buildDisabled(context);
+    }
+  }
+}
+
+class FluentButton extends BaseButton {
+  const FluentButton({
+    required this.onPressed,
+    required this.child,
+    this.width,
+    super.enabled,
+    super.isLoading,
+    super.key,
+  });
+
+  final void Function() onPressed;
+
+  final Widget child;
+
+  final double? width;
+
+  static const _kFluentButtonPadding = 24;
+
+  @override
+  Widget buildNormal(BuildContext context) {
+    Widget child = this.child;
+    if (width != null) {
+      child = child.fixWidth(width! - _kFluentButtonPadding);
+    }
+    return FilledButton(
+      onPressed: onPressed,
+      child: child,
+    );
+  }
+
+  @override
+  Widget buildLoading(BuildContext context) {
+    Widget child = Center(
+      child: const ProgressRing(
+        strokeWidth: 1.6,
+      ).fixWidth(14).fixHeight(14),
+    );
+    if (width != null) {
+      child = child.fixWidth(width!);
+    }
+    return Container(
+      height: 26,
+      decoration: BoxDecoration(
+          color: FluentTheme.of(context).inactiveBackgroundColor,
+          borderRadius: BorderRadius.circular(4)),
+      child: child,
+    );
+  }
+
+  @override
+  Widget buildDisabled(BuildContext context) {
+    Widget child = Center(
+      child: this.child,
+    );
+    if (width != null) {
+      child = child.fixWidth(width!);
+    }
+    return Center(
+      child: Container(
+        height: 26,
+        decoration: BoxDecoration(
+            color: FluentTheme.of(context).inactiveBackgroundColor,
+            borderRadius: BorderRadius.circular(4)),
+        child: child,
+      ),
+    );
+  }
+}