fix(player): 优化加载指示器与锁定进度条

lib/pages/player/widgets/seek_progress_bar.dart

@@ -9,6 +9,8 @@ import 'package:video_player/video_player.dart';
 import '../../../core/theme/app_colors.dart';
 import 'loading_progress_track.dart';
 
+const Key _inactiveTrackKey = Key('progress-inactive');
+
 /// Keeps seeks within the playable range so dragging to the edge does not
 /// trigger the player's completion callback before playback resumes.
 Duration seekPositionForFraction(double fraction, Duration duration) {
@@ -29,6 +31,7 @@ class SeekProgressBar extends StatefulWidget {
     this.showTimes = true,
     this.compact = false,
     this.inactiveTrackColor = AppColors.border,
+    this.locked = false,
   });
 
   final ValueListenable<VideoPlayerValue>? valueListenable;
@@ -38,6 +41,7 @@ class SeekProgressBar extends StatefulWidget {
   final bool showTimes;
   final bool compact;
   final Color inactiveTrackColor;
+  final bool locked;
 
   @override
   State<SeekProgressBar> createState() => _SeekProgressBarState();
@@ -67,6 +71,16 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
       _buffering = false;
       _attachSource();
     }
+    if (oldWidget.locked != widget.locked) {
+      _bufferTimer?.cancel();
+      _bufferTimer = null;
+      _buffering = false;
+      if (widget.locked) {
+        _previewFraction.value = null;
+      } else {
+        _syncBufferState(notify: false);
+      }
+    }
   }
 
   @override
@@ -90,7 +104,7 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
 
   void _syncBufferState({bool notify = true}) {
     final source = widget.valueListenable;
-    if (source == null) {
+    if (widget.locked || source == null) {
       _bufferTimer?.cancel();
       _bufferTimer = null;
       _setBuffering(false, notify: notify);
@@ -133,6 +147,7 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
   }
 
   Future<void> _finish(double fraction, Duration duration) async {
+    if (widget.locked) return;
     final source = widget.valueListenable;
     _previewFraction.value = fraction;
     try {
@@ -166,8 +181,13 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
   Widget _buildTrack(BuildContext context, VideoPlayerValue video) {
     final total = video.duration.inMilliseconds;
     final scrubbing = _previewFraction.value != null;
-    final loading = !scrubbing && (!video.isInitialized || _buffering);
-    final enabled = video.isInitialized && total > 0 && widget.onSeek != null;
+    final loading =
+        !widget.locked && !scrubbing && (!video.isInitialized || _buffering);
+    final enabled =
+        !widget.locked &&
+        video.isInitialized &&
+        total > 0 &&
+        widget.onSeek != null;
     final played = total > 0
         ? (video.position.inMilliseconds / total).clamp(0.0, 1.0)
         : 0.0;
@@ -203,7 +223,9 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
           ),
         SizedBox(
           height: trackAreaHeight,
-          child: loading
+          child: widget.locked
+              ? _inactiveTrack(trackHeight)
+              : loading
               ? Center(
                   child: LoadingProgressTrack(
                     height: trackHeight,
@@ -251,6 +273,19 @@ class _SeekProgressBarState extends State<SeekProgressBar> {
     );
   }
 
+  Widget _inactiveTrack(double height) {
+    return Center(
+      child: SizedBox(
+        width: double.infinity,
+        height: height,
+        child: ColoredBox(
+          key: _inactiveTrackKey,
+          color: widget.inactiveTrackColor,
+        ),
+      ),
+    );
+  }
+
   String _format(Duration value) {
     final minutes = value.inMinutes.remainder(60).toString().padLeft(2, '0');
     final seconds = value.inSeconds.remainder(60).toString().padLeft(2, '0');