UI: auto next in playlist

Bmp.WinForms/MainForm.cs

@@ -89,7 +89,7 @@ namespace Bmp.WinForms
 
             try
             {
-                var meta = await Task.Run(() => InputSourceProvider.GetMeta(item.Name));
+                var meta = await Task.Run(() => InputSourceProvider.ReadMeta(item.Name));
                 if (meta.Error == null)
                 {
                     var fileName = Path.GetFileNameWithoutExtension(item.Name);
@@ -181,7 +181,7 @@ namespace Bmp.WinForms
             _inputSource = await Task.Run(() => InputSourceProvider.CreateWaveStream(_currentListViewItem!.Name, _sl?.State?.DecodeDsdToPcm == true));
         }
 
-        private async Task DeInitOutputDevice()
+        private async Task DeInitOutputDeviceAsync()
         {
             var local = _outputDevice;
             _outputDevice = null;
@@ -203,7 +203,7 @@ namespace Bmp.WinForms
 
         private async Task<bool> ReInitOutputDevice()
         {
-            await DeInitOutputDevice();
+            await DeInitOutputDeviceAsync();
 
             var finalState = EMOJI_PLAY_BIG;
 
@@ -355,7 +355,7 @@ namespace Bmp.WinForms
         private async Task StopAsync()
         {
             _playbackState = UIPlaybackState.Stopped;
-            await DeInitOutputDevice();
+            await DeInitOutputDeviceAsync();
 
             if (_inputSource != null) await _inputSource.DisposeAsync();
             _inputSource = null;
@@ -392,17 +392,44 @@ namespace Bmp.WinForms
         private async Task PauseAsync()
         {
             _playbackState = UIPlaybackState.Paused;
-            await DeInitOutputDevice();
+            await DeInitOutputDeviceAsync();
         }
 
-        private void TrackPrev()
+        private async Task TrackPrevAsync()
         {
             //TODO: 上一曲(按播放模式)
+            if (_currentListViewItem != null)
+            {
+                if (_currentListViewItem.ListView != null)
+                {
+                    var nextIndex = _currentListViewItem.Index - 1;
+                    if (nextIndex > 0)
+                    {
+                        await LoadItemAsync(MainListView.Items[nextIndex]);
+                    }
+                }
+            }
         }
 
-        private void TrackNext()
+        private async Task TrackNextAsync()
         {
             //TODO: 下一曲(按播放模式)
+            if (_currentListViewItem != null)
+            {
+                if (_currentListViewItem.ListView != null)
+                {
+                    var nextIndex = _currentListViewItem.Index + 1;
+                    if (MainListView.Items.Count > nextIndex)
+                    {
+                        await LoadItemAsync(MainListView.Items[nextIndex]);
+                    }
+                    else
+                    {
+                        //列表最后一项时
+                        _playbackState = UIPlaybackState.Stopped;
+                    }
+                }
+            }
         }
 
         // -----------------  playback event -----------------
@@ -420,7 +447,7 @@ namespace Bmp.WinForms
             if (e.Exception == null)
             {
                 //TODO: 正常播放结束 下一曲(按播放模式)
-                _playbackState = UIPlaybackState.Stopped; //列表最后一项时
+                await TrackNextAsync();
             }
             else
             {
@@ -966,9 +993,9 @@ namespace Bmp.WinForms
 
         private async void PauseButton_Click(object sender, EventArgs e) => await PauseAsync();
 
-        private void PrevButton_Click(object sender, EventArgs e) => TrackPrev();
+        private async void PrevButton_Click(object sender, EventArgs e) => await TrackPrevAsync();
 
-        private void NextButton_Click(object sender, EventArgs e) => TrackNext();
+        private async void NextButton_Click(object sender, EventArgs e) => await TrackNextAsync();
 
         // -----------------  UI event: Others -----------------