fix(player): 修正进度条按下与拖动状态

docs/plans/PROGRESS.md

@@ -1187,3 +1187,9 @@ $ flutter test
 - 进度条固定中心并动画到 6 高，命中高度 32，时间气泡限制在左右 12；end/cancel/pointer 兜底均恢复拖动前状态。
 - 修复 `scrubCancelRequest` 误置于 `initState` 的编译错误，并清理推荐页未使用变量；`flutter analyze` 无问题。
 - 观看全集按钮相对进度条上移 8，间距调整为 20；按钮改为屏幕宽度 70% 左对齐，`flutter analyze` 无问题。
+
+## 2026-10-22 进度条按下与拖动彻底修复
+
+- Slider 不再在 `onChangeStart` 清屏；首次真实移动后才进入 scrub，轨道 2/6、thumb 6/8。
+- 推荐流拖动使用独立 opaque 手势与 pointer 兜底，end/cancel 同时恢复浮层和轨道。
+- `flutter test test/player/seek_scrub_visibility_test.dart`：tap、首次移动、松手恢复 3 项测试全部通过。

lib/pages/player/widgets/seek_progress_bar.dart

@@ -30,6 +30,7 @@ class SeekProgressBar extends StatefulWidget {
     required this.valueListenable,
     required this.semanticsLabel,
     this.onScrubStart,
+    this.onScrubEnd,
     this.onSeek,
     this.showTimes = true,
     this.compact = false,
@@ -45,6 +46,7 @@ class SeekProgressBar extends StatefulWidget {
   final ValueListenable<VideoPlayerValue>? valueListenable;
   final String semanticsLabel;
   final VoidCallback? onScrubStart;
+  final VoidCallback? onScrubEnd;
   final Future<void> Function(Duration)? onSeek;
   final bool showTimes;
   final bool compact;
@@ -66,6 +68,10 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
   final _previewFraction = ValueNotifier<double?>(null);
   Timer? _bufferTimer;
   bool _buffering = false;
+  bool _dragging = false;
+  bool _pointerMoved = false;
+  Offset? _pointerStart;
+  double? _dragStartFraction;
 
   @override
   void initState() {
@@ -165,10 +171,14 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
   }
 
   Future<void> _finish(double fraction, Duration duration) async {
-    if (widget.locked) return;
-    _previewFraction.value = fraction;
+    if (widget.locked || !_dragging) return;
+    setState(() => _dragging = false);
+    _pointerMoved = false;
+    _pointerStart = null;
+    _dragStartFraction = null;
     widget.thumbnailService?.cancelPending();
     _previewFraction.value = null;
+    widget.onScrubEnd?.call();
     await widget.onSeek?.call(seekPositionForFraction(fraction, duration));
   }
 
@@ -193,7 +203,7 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
 
   Widget _buildTrack(BuildContext context, VideoPlayerValue video) {
     final total = video.duration.inMilliseconds;
-    final scrubbing = _previewFraction.value != null;
+    final scrubbing = _dragging;
     final loading = !widget.locked && !scrubbing && _buffering;
     final enabled =
         !widget.locked &&
@@ -212,9 +222,7 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
         widget.showTimes &&
         widget.thumbnailService != null &&
         (widget.episodeId?.isNotEmpty ?? false);
-    final trackHeight = widget.compact
-        ? (scrubbing ? 3.0 : 1.5)
-        : (scrubbing ? 4.0 : 3.0);
+    final trackHeight = scrubbing ? 6.0 : 2.0;
     final trackAreaHeight = loading
         ? (widget.compact ? 20.0 : 44.0)
         : widget.compact
@@ -258,9 +266,7 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
                         inactiveTrackColor: widget.inactiveTrackColor,
                         thumbColor: AppColors.onPrimary,
                         thumbShape: RoundSliderThumbShape(
-                          enabledThumbRadius: widget.compact
-                              ? (scrubbing ? 6 : 4)
-                              : (scrubbing ? 8 : 6),
+                          enabledThumbRadius: scrubbing ? 8 : 6,
                         ),
                         overlayShape: RoundSliderOverlayShape(
                           overlayRadius: widget.compact ? 12 : 18,
@@ -268,23 +274,57 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
                       ),
                       child: Semantics(
                         label: widget.semanticsLabel,
-                        child: Slider(
-                          value: fraction,
-                          // 轨道与上方文案共用同一层水平内边距，避免 Slider 默认内缩。
-                          padding: EdgeInsets.zero,
-                          onChangeStart: enabled
-                              ? (value) {
-                                  _previewFraction.value = value;
-                                  widget.onScrubStart?.call();
-                                }
-                              : null,
-                          onChanged: enabled
-                              ? (value) => _previewFraction.value = value
-                              : null,
-                          onChangeEnd: enabled
-                              ? (value) =>
-                                    unawaited(_finish(value, video.duration))
-                              : null,
+                        child: Listener(
+                          onPointerDown: (event) {
+                            _pointerStart = event.position;
+                            _pointerMoved = false;
+                          },
+                          onPointerMove: (event) {
+                            final start = _pointerStart;
+                            if (start != null &&
+                                (event.position - start).distance > 0) {
+                              _pointerMoved = true;
+                            }
+                          },
+                          onPointerUp: (_) {
+                            if (!_dragging) {
+                              _pointerMoved = false;
+                              _pointerStart = null;
+                              _dragStartFraction = null;
+                            }
+                          },
+                          onPointerCancel: (_) {
+                            if (!_dragging) {
+                              _pointerMoved = false;
+                              _pointerStart = null;
+                              _dragStartFraction = null;
+                            }
+                          },
+                          child: Slider(
+                            value: fraction,
+                            // 轨道与上方文案共用同一层水平内边距，避免 Slider 默认内缩。
+                            padding: EdgeInsets.zero,
+                            onChangeStart: enabled
+                                ? (value) {
+                                    _dragStartFraction = value;
+                                    _pointerMoved = false;
+                                  }
+                                : null,
+                            onChanged: enabled
+                                ? (value) {
+                                    if (!_pointerMoved) return;
+                                    if (!_dragging) {
+                                      setState(() => _dragging = true);
+                                      widget.onScrubStart?.call();
+                                    }
+                                    _previewFraction.value = value;
+                                  }
+                                : null,
+                            onChangeEnd: enabled
+                                ? (value) =>
+                                      unawaited(_finish(value, video.duration))
+                                : null,
+                          ),
                         ),
                       ),
                     ),

test/player/seek_scrub_visibility_test.dart

@@ -0,0 +1,149 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/pages/player/widgets/seek_progress_bar.dart';
+import 'package:video_player/video_player.dart';
+
+void main() {
+  testWidgets('tapping the progress bar does not hide the overlay', (
+    tester,
+  ) async {
+    final harness = await _pumpHarness(tester);
+
+    await tester.tap(find.byType(Slider));
+    await tester.pumpAndSettle();
+
+    expect(find.byKey(const Key('scrub-overlay')), findsOneWidget);
+    expect(harness.scrubStarts, 0);
+    expect(harness.seeks, 0);
+    expect(_sliderTheme(tester).trackHeight, 2);
+  });
+
+  testWidgets('horizontal drag hides the overlay and thickens the track', (
+    tester,
+  ) async {
+    final harness = await _pumpHarness(tester);
+    final slider = find.byType(Slider);
+    final gesture = await tester.startGesture(tester.getCenter(slider));
+
+    await gesture.moveBy(const Offset(24, 0));
+    await tester.pump();
+    expect(find.byKey(const Key('scrub-overlay')), findsNothing);
+    expect(harness.scrubStarts, 1);
+    expect(_sliderTheme(tester).trackHeight, 6);
+    expect(
+      (_sliderTheme(tester).thumbShape! as RoundSliderThumbShape)
+          .enabledThumbRadius,
+      8,
+    );
+
+    await gesture.moveBy(const Offset(72, 0));
+    await tester.pump();
+    await gesture.up();
+    await tester.pumpAndSettle();
+  });
+
+  testWidgets('releasing restores the overlay and idle track height', (
+    tester,
+  ) async {
+    final harness = await _pumpHarness(tester);
+    final gesture = await tester.startGesture(
+      tester.getCenter(find.byType(Slider)),
+    );
+    await gesture.moveBy(const Offset(32, 0));
+    await tester.pump();
+    await gesture.moveBy(const Offset(64, 0));
+    await tester.pump();
+    await gesture.up();
+    await tester.pumpAndSettle();
+
+    expect(find.byKey(const Key('scrub-overlay')), findsOneWidget);
+    expect(harness.scrubEnds, 1);
+    expect(harness.seeks, 1);
+    expect(_sliderTheme(tester).trackHeight, 2);
+    expect(
+      (_sliderTheme(tester).thumbShape! as RoundSliderThumbShape)
+          .enabledThumbRadius,
+      6,
+    );
+  });
+}
+
+Future<_HarnessState> _pumpHarness(WidgetTester tester) async {
+  final controller = ValueNotifier<VideoPlayerValue>(
+    const VideoPlayerValue(
+      duration: Duration(minutes: 2),
+      position: Duration(seconds: 20),
+      isInitialized: true,
+    ),
+  );
+  addTearDown(controller.dispose);
+  final key = GlobalKey<_HarnessState>();
+  await tester.pumpWidget(
+    MaterialApp(
+      home: Scaffold(
+        body: _Harness(key: key, controller: controller),
+      ),
+    ),
+  );
+  await tester.pumpAndSettle();
+  return key.currentState!;
+}
+
+SliderThemeData _sliderTheme(WidgetTester tester) {
+  return tester
+      .widget<SliderTheme>(
+        find
+            .ancestor(
+              of: find.byType(Slider),
+              matching: find.byType(SliderTheme),
+            )
+            .first,
+      )
+      .data;
+}
+
+class _Harness extends StatefulWidget {
+  const _Harness({super.key, required this.controller});
+
+  final ValueNotifier<VideoPlayerValue> controller;
+
+  @override
+  State<_Harness> createState() => _HarnessState();
+}
+
+class _HarnessState extends State<_Harness> {
+  bool visible = true;
+  int scrubStarts = 0;
+  int scrubEnds = 0;
+  int seeks = 0;
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        if (visible) const Text('Overlay', key: Key('scrub-overlay')),
+        SizedBox(
+          width: 320,
+          height: 80,
+          child: SeekProgressBar(
+            valueListenable: widget.controller,
+            semanticsLabel: 'Progress',
+            onScrubStart: () => setState(() {
+              visible = false;
+              scrubStarts++;
+            }),
+            onScrubEnd: () => setState(() {
+              visible = true;
+              scrubEnds++;
+            }),
+            onSeek: (_) async {
+              seeks++;
+            },
+          ),
+        ),
+      ],
+    );
+  }
+}