webdav存在自引用问题，现版本修复完成

2026-08-17 22:24:56 +08:00
parent 457a9bf1e5
commit a6056c7f1a
5 changed files with 874 additions and 622 deletions
@@ -0,0 +1,74 @@
+// lib/widgets/magnetic_scroll_physics.dart
+import 'package:flutter/material.dart';
+
+class MagneticScrollPhysics extends ClampingScrollPhysics {
+  final double snapPoint;
+  final double magneticZoneStart;
+
+  const MagneticScrollPhysics({
+    required this.snapPoint,
+    this.magneticZoneStart = 0.20,
+    super.parent,
+  });
+
+  @override
+  MagneticScrollPhysics applyTo(ScrollPhysics? ancestor) {
+    return MagneticScrollPhysics(
+      snapPoint: snapPoint,
+      magneticZoneStart: magneticZoneStart,
+      parent: buildParent(ancestor),
+    );
+  }
+
+  @override
+  Simulation? createBallisticSimulation(
+    ScrollMetrics position,
+    double velocity,
+  ) {
+    final offset = position.pixels;
+
+    if (offset <= 0 || offset >= snapPoint) {
+      return super.createBallisticSimulation(position, velocity);
+    }
+
+    final shouldSnap = _shouldSnap(offset, velocity);
+
+    final target = shouldSnap ? snapPoint : 0.0;
+
+    if ((offset - target).abs() < 1.0) {
+      return null;
+    }
+
+    return ScrollSpringSimulation(
+      SpringDescription(
+        mass: 1.0,
+        stiffness: 320.0,
+        damping: 26.0,
+      ),
+      offset,
+      target,
+      velocity,
+      tolerance: const Tolerance(
+        velocity: 0.01,
+        distance: 0.5,
+      ),
+    );
+  }
+
+  bool _shouldSnap(double offset, double velocity) {
+    final zoneStart = snapPoint * magneticZoneStart;
+
+    // 向上滑 → 吸附展开
+    if (velocity > 20) {
+      return true;
+    }
+
+    // 向下滑 → 回去
+    if (velocity < -20) {
+      return false;
+    }
+
+    // 松手速度很小，用当前位置决定
+    return offset >= zoneStart;
+  }
+}