feat: UI 2.0 and other Improvements (#357)

Co-authored-by: PartyDonut <PartyDonut@users.noreply.github.com>

lib/util/adaptive_layout/adaptive_layout_model.dart

@@ -0,0 +1,93 @@
+import 'package:flutter/material.dart';
+
+import 'package:fladder/util/adaptive_layout/adaptive_layout.dart';
+import 'package:fladder/util/poster_defaults.dart';
+
+class LayoutPoints {
+  final double start;
+  final double end;
+  final ViewSize type;
+  LayoutPoints({
+    required this.start,
+    required this.end,
+    required this.type,
+  });
+
+  LayoutPoints copyWith({
+    double? start,
+    double? end,
+    ViewSize? type,
+  }) {
+    return LayoutPoints(
+      start: start ?? this.start,
+      end: end ?? this.end,
+      type: type ?? this.type,
+    );
+  }
+
+  @override
+  String toString() => 'LayoutPoints(start: $start, end: $end, type: $type)';
+
+  @override
+  bool operator ==(covariant LayoutPoints other) {
+    if (identical(this, other)) return true;
+    return other.start == start && other.end == end && other.type == type;
+  }
+
+  @override
+  int get hashCode => start.hashCode ^ end.hashCode ^ type.hashCode;
+}
+
+@immutable
+class AdaptiveLayoutModel {
+  final ViewSize viewSize;
+  final LayoutMode layoutMode;
+  final InputDevice inputDevice;
+  final TargetPlatform platform;
+  final bool isDesktop;
+  final PosterDefaults posterDefaults;
+  final ScrollController controller;
+  final double sideBarWidth;
+
+  const AdaptiveLayoutModel({
+    required this.viewSize,
+    required this.layoutMode,
+    required this.inputDevice,
+    required this.platform,
+    required this.isDesktop,
+    required this.posterDefaults,
+    required this.controller,
+    required this.sideBarWidth,
+  });
+
+  AdaptiveLayoutModel copyWith({
+    ViewSize? viewSize,
+    LayoutMode? layoutMode,
+    InputDevice? inputDevice,
+    TargetPlatform? platform,
+    bool? isDesktop,
+    PosterDefaults? posterDefaults,
+    ScrollController? controller,
+    double? sideBarWidth,
+  }) {
+    return AdaptiveLayoutModel(
+      viewSize: viewSize ?? this.viewSize,
+      layoutMode: layoutMode ?? this.layoutMode,
+      inputDevice: inputDevice ?? this.inputDevice,
+      platform: platform ?? this.platform,
+      isDesktop: isDesktop ?? this.isDesktop,
+      posterDefaults: posterDefaults ?? this.posterDefaults,
+      controller: controller ?? this.controller,
+      sideBarWidth: sideBarWidth ?? this.sideBarWidth,
+    );
+  }
+
+  @override
+  bool operator ==(covariant AdaptiveLayoutModel other) {
+    if (identical(this, other)) return true;
+    return other.viewSize == viewSize && other.layoutMode == layoutMode && other.sideBarWidth == sideBarWidth;
+  }
+
+  @override
+  int get hashCode => viewSize.hashCode ^ layoutMode.hashCode ^ sideBarWidth.hashCode;
+}