1 files changed, 63 insertions, 53 deletions

diff --git a/apps/web/src/core/index.ts b/apps/web/src/core/index.ts
index f1c2d032..1086a6d2 100644
--- a/apps/web/src/core/index.ts
+++ b/apps/web/src/core/index.ts
@@ -1,53 +1,63 @@
-import { PlaybackManager } from "./managers/playback-manager";

-import { TimelineManager } from "./managers/timeline-manager";

-import { ScenesManager } from "./managers/scenes-manager";

-import { ProjectManager } from "./managers/project-manager";

-import { MediaManager } from "./managers/media-manager";

-import { RendererManager } from "./managers/renderer-manager";

-import { CommandManager } from "./managers/commands";

-import { SaveManager } from "./managers/save-manager";

-import { AudioManager } from "./managers/audio-manager";

-import { SelectionManager } from "./managers/selection-manager";

-import { registerDefaultEffects } from "@/lib/effects";

-import { registerDefaultMasks } from "@/lib/masks";

-

-export class EditorCore {

-	private static instance: EditorCore | null = null;

-	public readonly timeline: TimelineManager;

-	public readonly command: CommandManager;

-	public readonly playback: PlaybackManager;

-	public readonly scenes: ScenesManager;

-	public readonly project: ProjectManager;

-	public readonly media: MediaManager;

-	public readonly renderer: RendererManager;

-	public readonly save: SaveManager;

-	public readonly audio: AudioManager;

-	public readonly selection: SelectionManager;

-

-	private constructor() {

-		registerDefaultEffects();

-		registerDefaultMasks();

-		this.command = new CommandManager(this);

-		this.timeline = new TimelineManager(this);

-		this.playback = new PlaybackManager(this);

-		this.scenes = new ScenesManager(this);

-		this.project = new ProjectManager(this);

-		this.media = new MediaManager(this);

-		this.renderer = new RendererManager(this);

-		this.save = new SaveManager(this);

-		this.audio = new AudioManager(this);

-		this.selection = new SelectionManager(this);

-		this.save.start();

-	}

-

-	static getInstance(): EditorCore {

-		if (!EditorCore.instance) {

-			EditorCore.instance = new EditorCore();

-		}

-		return EditorCore.instance;

-	}

-

-	static reset(): void {

-		EditorCore.instance = null;

-	}

-}

+import { PlaybackManager } from "./managers/playback-manager";
+import { TimelineManager } from "./managers/timeline-manager";
+import { ScenesManager } from "./managers/scenes-manager";
+import { ProjectManager } from "./managers/project-manager";
+import { MediaManager } from "./managers/media-manager";
+import { RendererManager } from "./managers/renderer-manager";
+import { CommandManager } from "./managers/commands";
+import { SaveManager } from "./managers/save-manager";
+import { AudioManager } from "./managers/audio-manager";
+import { SelectionManager } from "./managers/selection-manager";
+import { registerDefaultEffects } from "@/lib/effects";
+import { registerDefaultMasks } from "@/lib/masks";
+import { isMainTrack } from "@/lib/timeline/placement";
+
+export class EditorCore {
+	private static instance: EditorCore | null = null;
+	public readonly timeline: TimelineManager;
+	public readonly command: CommandManager;
+	public readonly playback: PlaybackManager;
+	public readonly scenes: ScenesManager;
+	public readonly project: ProjectManager;
+	public readonly media: MediaManager;
+	public readonly renderer: RendererManager;
+	public readonly save: SaveManager;
+	public readonly audio: AudioManager;
+	public readonly selection: SelectionManager;
+
+	private constructor() {
+		registerDefaultEffects();
+		registerDefaultMasks();
+		this.command = new CommandManager(this);
+		this.timeline = new TimelineManager(this);
+		this.playback = new PlaybackManager(this);
+		this.scenes = new ScenesManager(this);
+		this.project = new ProjectManager(this);
+		this.media = new MediaManager(this);
+		this.renderer = new RendererManager(this);
+		this.save = new SaveManager(this);
+		this.audio = new AudioManager(this);
+		this.selection = new SelectionManager(this);
+		this.command.registerReactor(() => {
+			const tracks = this.timeline.getTracks();
+			const prunedTracks = tracks.filter(
+				(track) => track.elements.length > 0 || isMainTrack(track),
+			);
+			if (prunedTracks.length !== tracks.length) {
+				this.timeline.updateTracks(prunedTracks);
+			}
+		});
+		this.save.start();
+	}
+
+	static getInstance(): EditorCore {
+		if (!EditorCore.instance) {
+			EditorCore.instance = new EditorCore();
+		}
+		return EditorCore.instance;
+	}
+
+	static reset(): void {
+		EditorCore.instance = null;
+	}
+}