feat(ui_component): add loader component and style

packages/wyatt_ui_components/lib/src/domain/entities/entities.dart

@@ -20,5 +20,7 @@ export './buttons/buttons.dart';
 export './cards/cards.dart';
 export './component.dart';
 export './error_widget_component.dart';
+export './loader_component.dart';
+export './loader_style.dart';
 export './loading_widget_component.dart';
 export './theme_style.dart';

packages/wyatt_ui_components/lib/src/domain/entities/loader_component.dart

@@ -0,0 +1,50 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter/widgets.dart';
+import 'package:wyatt_component_copy_with_extension/component_copy_with_extension.dart';
+import 'package:wyatt_ui_components/wyatt_wyatt_ui_components.dart';
+
+part 'loader_component.g.dart';
+
+@ComponentProxyExtension()
+abstract class LoaderComponent extends Component
+    with CopyWithMixin<$LoaderComponentCWProxy> {
+  const LoaderComponent({
+    this.colors,
+    this.radius,
+    this.stroke,
+    this.duration,
+    this.flip,
+    super.themeResolver,
+    super.key,
+  });
+
+  /// Gradient colors from start to end.
+  final MultiColor? colors;
+
+  /// Loader radius
+  final double? radius;
+
+  /// Loader stroke width
+  final double? stroke;
+
+  /// Animation duration
+  final Duration? duration;
+  
+  /// Flip the animation
+  final bool? flip;
+}

packages/wyatt_ui_components/lib/src/domain/entities/loader_component.g.dart

@@ -0,0 +1,27 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'loader_component.dart';
+
+// **************************************************************************
+// ComponentProxyGenerator
+// **************************************************************************
+
+abstract class $LoaderComponentCWProxy {
+  LoaderComponent colors(MultiColor? colors);
+  LoaderComponent radius(double? radius);
+  LoaderComponent stroke(double? stroke);
+  LoaderComponent duration(Duration? duration);
+  LoaderComponent flip(bool? flip);
+  LoaderComponent themeResolver(
+      ThemeResolver<dynamic, dynamic, dynamic>? themeResolver);
+  LoaderComponent key(Key? key);
+  LoaderComponent call({
+    MultiColor? colors,
+    double? radius,
+    double? stroke,
+    Duration? duration,
+    bool? flip,
+    ThemeResolver<dynamic, dynamic, dynamic>? themeResolver,
+    Key? key,
+  });
+}

packages/wyatt_ui_components/lib/src/domain/entities/loader_style.dart

@@ -0,0 +1,86 @@
+// Copyright (C) 2023 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'dart:ui';
+
+import 'package:wyatt_ui_components/wyatt_wyatt_ui_components.dart';
+
+class LoaderStyle extends ThemeStyle<LoaderStyle> {
+  const LoaderStyle({
+    this.colors,
+    this.stroke,
+  });
+
+  /// Merges non-null `b` attributes in `a`
+  static LoaderStyle? merge(
+    LoaderStyle? a,
+    LoaderStyle? b,
+  ) {
+    if (b == null) {
+      return a?.copyWith();
+    }
+    if (a == null) {
+      return b.copyWith();
+    }
+
+    return a.copyWith(
+      colors: b.colors,
+      stroke: b.stroke,
+    );
+  }
+
+  /// Used for interpolation.
+  static LoaderStyle? lerp(
+    LoaderStyle? a,
+    LoaderStyle? b,
+    double t,
+  ) {
+    if (a == null || b == null) {
+      return null;
+    }
+    // b.copyWith to return b attributes even if they are not lerped
+    return b.copyWith(
+      colors: MultiColor.lerp(a.colors, b.colors, t),
+      stroke: lerpDouble(a.stroke, b.stroke, t),
+    );
+  }
+
+  /// Gradient colors from start to end.
+  final MultiColor? colors;
+
+  /// Loader stroke width
+  final double? stroke;
+
+  @override
+  LoaderStyle mergeWith(LoaderStyle? other) => LoaderStyle.merge(this, other)!;
+
+  @override
+  LoaderStyle? lerpWith(LoaderStyle? other, double t) =>
+      LoaderStyle.lerp(this, other, t);
+
+  @override
+  LoaderStyle copyWith({
+    MultiColor? colors,
+    double? stroke,
+  }) =>
+      LoaderStyle(
+        colors: colors ?? this.colors,
+        stroke: stroke ?? this.stroke,
+      );
+
+  @override
+  String toString() => 'LoaderStyle($colors, $stroke)';
+}