fix(player): 修正进度条按下与拖动状态

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,
+                          ),
                         ),
                       ),
                     ),