Feature: Cross-fade

lib/components/AudioServiceSettingsScreen/crossfade_duration_slider.dart

@@ -0,0 +1,36 @@
+import 'package:finamp/l10n/app_localizations.dart';
+import 'package:finamp/services/finamp_settings_helper.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+class CrossfadeDurationSlider extends ConsumerWidget {
+  const CrossfadeDurationSlider({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final crossfadeDuration = ref.watch(finampSettingsProvider.crossfadeDuration);
+    final seconds = crossfadeDuration.inSeconds;
+
+    return ListTile(
+      title: Text(AppLocalizations.of(context)!.crossfadeDurationSettingTitle),
+      subtitle: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(AppLocalizations.of(context)!.crossfadeDurationSettingSubtitle),
+          Slider(
+            min: 0,
+            max: 15,
+            divisions: 15,
+            value: seconds.clamp(0, 15).toDouble(),
+            label: seconds == 0
+                ? AppLocalizations.of(context)!.crossfadeDurationSettingOff
+                : AppLocalizations.of(context)!.crossfadeDurationSettingValue(seconds),
+            onChanged: (value) {
+              FinampSetters.setCrossfadeDuration(Duration(seconds: value.toInt()));
+            },
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/l10n/app_en.arb

@@ -2618,6 +2618,27 @@
   "@audioFadeInDurationSettingSubtitle": {
     "description": "Subtitle for the audio fade-in duration setting. Set to 0 to disable fade-in."
   },
+  "crossfadeDurationSettingTitle": "Crossfade",
+  "@crossfadeDurationSettingTitle": {
+    "description": "Title for the crossfade duration setting."
+  },
+  "crossfadeDurationSettingSubtitle": "Overlap audio between tracks during automatic transitions. Set to 0 to disable.",
+  "@crossfadeDurationSettingSubtitle": {
+    "description": "Subtitle for the crossfade duration setting."
+  },
+  "crossfadeDurationSettingValue": "{seconds}s",
+  "@crossfadeDurationSettingValue": {
+    "description": "Label showing the current crossfade duration value in seconds.",
+    "placeholders": {
+      "seconds": {
+        "type": "int"
+      }
+    }
+  },
+  "crossfadeDurationSettingOff": "Off",
+  "@crossfadeDurationSettingOff": {
+    "description": "Label shown when crossfade is disabled (0 seconds)."
+  },
   "outputMenuButtonTitle": "Output",
   "@outputMenuButtonTitle": {
     "description": "Button title for opening the output menu/panel"

lib/models/finamp_models.dart

@@ -251,6 +251,7 @@ class DefaultSettings {
   static const forceAudioOffloadingOnAndroid = false;
   static const previousTracksPersistenceMode = PreviousTracksPersistenceMode.persistent;
   static const useAndroidGainEffect = true;
+  static const crossfadeDuration = Duration.zero;
 }
 
 @HiveType(typeId: 28)
@@ -396,6 +397,7 @@ class FinampSettings {
     this.forceAudioOffloadingOnAndroid = DefaultSettings.forceAudioOffloadingOnAndroid,
     this.previousTracksPersistenceMode = DefaultSettings.previousTracksPersistenceMode,
     this.useAndroidGainEffect = DefaultSettings.useAndroidGainEffect,
+    this.crossfadeDuration = DefaultSettings.crossfadeDuration,
   });
 
   @HiveField(0, defaultValue: DefaultSettings.isOffline)
@@ -857,6 +859,9 @@ class FinampSettings {
   @HiveField(147, defaultValue: DefaultSettings.useAndroidGainEffect)
   bool useAndroidGainEffect;
 
+  @HiveField(148, defaultValue: DefaultSettings.crossfadeDuration)
+  Duration crossfadeDuration;
+
   static Future<FinampSettings> create() async {
     final downloadLocation = await DownloadLocation.create(
       name: DownloadLocation.internalStorageName,

lib/screens/audio_service_settings_screen.dart

@@ -6,6 +6,7 @@ import 'package:finamp/services/finamp_settings_helper.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:finamp/components/AudioServiceSettingsScreen/buffer_duration_list_tile.dart';
+import 'package:finamp/components/AudioServiceSettingsScreen/crossfade_duration_slider.dart';
 import 'package:finamp/components/AudioServiceSettingsScreen/loadQueueOnStartup_selector.dart';
 import 'package:finamp/components/AudioServiceSettingsScreen/stop_foreground_selector.dart';
 import 'package:finamp/components/AudioServiceSettingsScreen/track_shuffle_item_count_editor.dart';
@@ -43,6 +44,7 @@ class _AudioServiceSettingsScreenState extends State<AudioServiceSettingsScreen>
           const TrackShuffleItemCountEditor(),
           const AudioFadeInDurationListTile(),
           const AudioFadeOutDurationListTile(),
+          const CrossfadeDurationSlider(),
           if (Platform.isAndroid) const BufferSizeListTile(),
           const BufferDurationListTile(),
           const BufferDisableSizeConstraintsSelector(),