WIP: track creation and deletion both in frontend and backend.

Source/Clip.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace AudioEditor;
+
+public class Clip
+{
+    public TimeSpan StartTime { get; private set; }
+    public TimeSpan EndTime { get; private set; }
+}

Source/Clip.cs.uid

@@ -0,0 +1 @@
+uid://b20juoqt3ac8x

Source/Project.cs

@@ -0,0 +1,46 @@
+using System.Collections.Generic;
+
+namespace AudioEditor;
+
+public class Project
+{
+    public int TrackCount => _tracks.Count;
+    public void AddTrack()
+    {
+        var idx = _tracks.Count;
+        _tracks.Add(new Track(idx, string.Empty));
+    }
+
+    public void DuplicateTrack(int idx)
+    {
+        if (idx < 0 && idx > _tracks.Count - 1)
+        {
+            return;
+        }
+
+        var track = _tracks[idx];
+        var duplicate = track.Duplicate();
+
+        _tracks.Add(duplicate);
+    }
+
+    public void RenameTrack(int idx, string name)
+    {
+        if (idx < 0 && idx > _tracks.Count - 1)
+        {
+            return;
+        }
+    }
+
+    public void DeleteTrack(int idx)
+    {
+        if (idx < 0 && idx > _tracks.Count - 1)
+        {
+            return;
+        }
+
+        _tracks.RemoveAt(idx);
+    }
+
+    private List<Track> _tracks = new();
+}

Source/Project.cs.uid

@@ -0,0 +1 @@
+uid://bvgn3tf07jspe

Source/ProjectController.cs

@@ -7,6 +7,9 @@ namespace AudioEditor;
 public partial class ProjectController : Node
 {
     [Signal] public delegate void AudioClipDroppedEventHandler(Vector2 atPosition, string path, string clipName, double startTime, double endTime);
+    [Signal] public delegate void OnTrackAddedEventHandler(int idx);
+    [Signal] public delegate void OnTrackRenamedEventHandler(int idx, string name);
+    [Signal] public delegate void OnTrackDuplicatedEventHandler(int idx);
     [Signal] public delegate void OnTrackDeletedEventHandler(int trackIdx);
 
     public override void _Ready()
@@ -14,9 +17,28 @@ public partial class ProjectController : Node
         GetWindow().FilesDropped += FilesDropped;
     }
 
-    public void DeleteTrack(int trackIdx)
+    public void AddTrack(int idx = 0)
     {
+        _project.AddTrack();
+        EmitSignal(SignalName.OnTrackAdded, _project.TrackCount - 1);
+    }
 
+    public void DuplicateTrack(int idx)
+    {
+        _project.DuplicateTrack(idx);
+        EmitSignal(SignalName.OnTrackDuplicated, idx);
+    }
+
+    public void RenameTrack(int idx, string name)
+    {
+        _project.RenameTrack(idx, name);
+        EmitSignal(SignalName.OnTrackRenamed, idx, name);
+    }
+
+    public void DeleteTrack(int idx)
+    {
+        _project.DeleteTrack(idx);
+        EmitSignal(SignalName.OnTrackDeleted, idx);
     }
 
     public void CreateAudioClipPreview(Control audioClip)
@@ -54,4 +76,6 @@ public partial class ProjectController : Node
 
         EmitSignal(SignalName.AudioClipDropped, mousePosition, path, fileName, 0, waveformInfo.Length.TotalMilliseconds);
     }
+
+    private Project _project = new();
 }

Source/Track.cs

@@ -0,0 +1,33 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace AudioEditor;
+
+public class Track
+{
+    public int Idx { get; private set; }
+    public string Name { get; private set; }
+
+    public Track(int idx, string name)
+    {
+        Idx = idx;
+        Name = name;
+    }
+
+    public Track(int idx, string name, IEnumerable<Clip> clips)
+    {
+        Idx = idx;
+        Name = name;
+        _clips = clips.ToList();
+    }
+
+    public bool TryAddClip(Clip clip)
+    {
+        _clips.Add(clip);
+        return false;
+    }
+
+    public Track Duplicate() => new(Idx, Name, _clips);
+
+    private List<Clip> _clips = new();
+}

Source/Track.cs.uid

@@ -0,0 +1 @@
+uid://dtk58stvxxdyl