mod: 侧边栏、动态重构，排行改为首页分区，平板、折叠屏、竖屏视频新适配，播放页可隐藏黑边、截图、点踩，弹幕粗细调整，默认关闭后台播放，弹窗接受返回

lib/utils/grid.dart

@@ -1,18 +1,112 @@
+import 'dart:math';
+
 import 'package:flutter/cupertino.dart';
+import 'package:flutter/rendering.dart';
 import 'storage.dart';
 class Grid {
   static double maxRowWidth = GStrorage.setting.get(SettingBoxKey.maxRowWidth, defaultValue: 240.0) as double;
-
-  static double calculateActualWidth(BuildContext context, double maxCrossAxisExtent, double crossAxisSpacing, {double? screenWidthOffset}) {
-    double screenWidth = MediaQuery.of(context).size.width;
-    if (screenWidthOffset != null) {
-      screenWidth -= screenWidthOffset;
-    }
-    int columnCount = ((screenWidth - crossAxisSpacing) / (maxCrossAxisExtent + crossAxisSpacing)).ceil();
-    if (columnCount < 1){
-      columnCount = 1;
-    }
-    double columnWidth = (screenWidth - crossAxisSpacing) ~/ columnCount - crossAxisSpacing;
-    return columnWidth;
-  }
+  //
+  // static double calculateActualWidth(BuildContext context, double maxCrossAxisExtent, double crossAxisSpacing, {double? screenWidthOffset}) {
+  //   double screenWidth = MediaQuery.of(context).size.width;
+  //   if (screenWidthOffset != null) {
+  //     screenWidth -= screenWidthOffset;
+  //   }
+  //   if (GStrorage.setting.get(SettingBoxKey.adaptiveNavBar, defaultValue: false) as bool) {
+  //     screenWidth -= 55;
+  //   }
+  //   int columnCount = ((screenWidth - crossAxisSpacing) / (maxCrossAxisExtent + crossAxisSpacing)).ceil();
+  //   if (columnCount < 1){
+  //     columnCount = 1;
+  //   }
+  //   double columnWidth = (screenWidth - crossAxisSpacing) ~/ columnCount - crossAxisSpacing;
+  //   return columnWidth;
+  // }
 }
+class SliverGridDelegateWithExtentAndRatio extends SliverGridDelegate {
+  /// Creates a delegate that makes grid layouts with tiles that have a maximum
+  /// cross-axis extent.
+  ///
+  /// The [maxCrossAxisExtent], [mainAxisExtent], [mainAxisSpacing],
+  /// and [crossAxisSpacing] arguments must not be negative.
+  /// The [childAspectRatio] argument must be greater than zero.
+  const SliverGridDelegateWithExtentAndRatio({
+    required this.maxCrossAxisExtent,
+    this.mainAxisSpacing = 0.0,
+    this.crossAxisSpacing = 0.0,
+    this.childAspectRatio = 1.0,
+    this.mainAxisExtent = 0.0,
+  }) : assert(maxCrossAxisExtent > 0),
+        assert(mainAxisSpacing >= 0),
+        assert(crossAxisSpacing >= 0),
+        assert(childAspectRatio > 0);
+
+  /// The maximum extent of tiles in the cross axis.
+  ///
+  /// This delegate will select a cross-axis extent for the tiles that is as
+  /// large as possible subject to the following conditions:
+  ///
+  ///  - The extent evenly divides the cross-axis extent of the grid.
+  ///  - The extent is at most [maxCrossAxisExtent].
+  ///
+  /// For example, if the grid is vertical, the grid is 500.0 pixels wide, and
+  /// [maxCrossAxisExtent] is 150.0, this delegate will create a grid with 4
+  /// columns that are 125.0 pixels wide.
+  final double maxCrossAxisExtent;
+
+  /// The number of logical pixels between each child along the main axis.
+  final double mainAxisSpacing;
+
+  /// The number of logical pixels between each child along the cross axis.
+  final double crossAxisSpacing;
+
+  /// The ratio of the cross-axis to the main-axis extent of each child.
+  final double childAspectRatio;
+
+
+  /// The extent of each tile in the main axis. If provided, it would add
+  /// after [childAspectRatio] is used.
+  final double mainAxisExtent;
+
+
+
+  bool _debugAssertIsValid(double crossAxisExtent) {
+    assert(crossAxisExtent > 0.0);
+    assert(maxCrossAxisExtent > 0.0);
+    assert(mainAxisSpacing >= 0.0);
+    assert(crossAxisSpacing >= 0.0);
+    assert(childAspectRatio > 0.0);
+    return true;
+  }
+
+  @override
+  SliverGridLayout getLayout(SliverConstraints constraints) {
+    assert(_debugAssertIsValid(constraints.crossAxisExtent));
+    int crossAxisCount = ((constraints.crossAxisExtent - crossAxisSpacing) / (maxCrossAxisExtent + crossAxisSpacing)).ceil();
+    // Ensure a minimum count of 1, can be zero and result in an infinite extent
+    // below when the window size is 0.
+    crossAxisCount = max(1, crossAxisCount);
+    final double usableCrossAxisExtent = max(
+      0.0,
+      constraints.crossAxisExtent - crossAxisSpacing * (crossAxisCount - 1),
+    );
+    final double childCrossAxisExtent = usableCrossAxisExtent / crossAxisCount;
+    final double childMainAxisExtent = childCrossAxisExtent / childAspectRatio + mainAxisExtent;
+    return SliverGridRegularTileLayout(
+      crossAxisCount: crossAxisCount,
+      mainAxisStride: childMainAxisExtent + mainAxisSpacing,
+      crossAxisStride: childCrossAxisExtent + crossAxisSpacing,
+      childMainAxisExtent: childMainAxisExtent,
+      childCrossAxisExtent: childCrossAxisExtent,
+      reverseCrossAxis: axisDirectionIsReversed(constraints.crossAxisDirection),
+    );
+  }
+
+  @override
+  bool shouldRelayout(SliverGridDelegateWithExtentAndRatio oldDelegate) {
+    return oldDelegate.maxCrossAxisExtent != maxCrossAxisExtent
+        || oldDelegate.mainAxisSpacing != mainAxisSpacing
+        || oldDelegate.crossAxisSpacing != crossAxisSpacing
+        || oldDelegate.childAspectRatio != childAspectRatio
+        || oldDelegate.mainAxisExtent != mainAxisExtent;
+  }
+}