From 6a22a3ecbdff2d0e6a4c24c8db40bb86bc01b692 Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Sat, 25 Apr 2026 03:56:22 +0200
Subject: refactor: centralize editor interaction state

Move timeline and preview gestures into dedicated controllers so hooks stay thin around editor state and DOM events.

This also routes drag and playback synchronization through manager APIs and reuses persistent wasm surfaces so scrubbing, seeking, and preview rendering stay in sync.

Made-with: Cursor
---
 apps/web/src/core/managers/playback-manager.ts | 44 +++++++++++++-------------
 1 file changed, 22 insertions(+), 22 deletions(-)

(limited to 'apps/web/src/core/managers/playback-manager.ts')

diff --git a/apps/web/src/core/managers/playback-manager.ts b/apps/web/src/core/managers/playback-manager.ts
index 1ea09826..a243dc19 100644
--- a/apps/web/src/core/managers/playback-manager.ts
+++ b/apps/web/src/core/managers/playback-manager.ts
@@ -10,6 +10,8 @@ export class PlaybackManager {
 	private previousVolume = 1;
 	private isScrubbing = false;
 	private listeners = new Set<() => void>();
+	private updateListeners = new Set<(time: number) => void>();
+	private seekListeners = new Set<(time: number) => void>();
 	private playbackTimer: number | null = null;
 	private playbackStartWallTime = 0;
 	private playbackStartTime = 0;
@@ -67,7 +69,7 @@ export class PlaybackManager {
 			this.playbackStartTime = this.currentTime;
 		}
 		this.notify();
-		this.dispatchSeekEvent(this.currentTime);
+		this.notifySeek(this.currentTime);
 	}
 
 	setVolume({ volume }: { volume: number }): void {
@@ -133,6 +135,16 @@ export class PlaybackManager {
 		return () => this.listeners.delete(listener);
 	}
 
+	onUpdate(listener: (time: number) => void): () => void {
+		this.updateListeners.add(listener);
+		return () => this.updateListeners.delete(listener);
+	}
+
+	onSeek(listener: (time: number) => void): () => void {
+		this.seekListeners.add(listener);
+		return () => this.seekListeners.delete(listener);
+	}
+
 	private reconcileTimelineScope(): void {
 		const maxTime = this.editor.timeline.getTotalDuration();
 		const nextTime = this.clampTimeToTimeline(this.currentTime);
@@ -152,7 +164,7 @@ export class PlaybackManager {
 		this.notify();
 
 		if (timeChanged) {
-			this.dispatchSeekEvent(this.currentTime);
+			this.notifySeek(this.currentTime);
 		}
 	}
 
@@ -196,12 +208,12 @@ export class PlaybackManager {
 			this.pause();
 			this.currentTime = maxTime;
 			this.notify();
-			this.dispatchSeekEvent(maxTime);
+			this.notifySeek(maxTime);
 			return;
 		}
 
 		this.currentTime = newTime;
-		this.dispatchUpdateEvent(newTime);
+		this.notifyUpdate(newTime);
 		this.playbackTimer = requestAnimationFrame(this.updateTime);
 	};
 
@@ -210,27 +222,15 @@ export class PlaybackManager {
 		return Math.max(0, Math.min(maxTime, time));
 	}
 
-	private dispatchSeekEvent(time: number): void {
-		if (typeof window === "undefined") {
-			return;
+	private notifySeek(time: number): void {
+		for (const fn of this.seekListeners) {
+			fn(time);
 		}
-
-		window.dispatchEvent(
-			new CustomEvent("playback-seek", {
-				detail: { time },
-			}),
-		);
 	}
 
-	private dispatchUpdateEvent(time: number): void {
-		if (typeof window === "undefined") {
-			return;
+	private notifyUpdate(time: number): void {
+		for (const fn of this.updateListeners) {
+			fn(time);
 		}
-
-		window.dispatchEvent(
-			new CustomEvent("playback-update", {
-				detail: { time },
-			}),
-		);
 	}
 }
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