fix(player): 修正进度条按下与拖动状态

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++;
+            },
+          ),
+        ),
+      ],
+    );
+  }
+}