Add track moving to audio clips

Scripts/Timeline.gd

@@ -35,6 +35,18 @@ func format_time_ms_minutes(ms: float) -> String:
 	return "%02d:%02d.%03d" % [minutes, seconds, milliseconds]
 
 
+func get_track_idx_by_y(y: float):
+	var idx = 0
+	for track in track_list.get_children():
+		if y >= track.global_position.y and y <= track.global_position.y + track.size.y:
+			return idx
+		idx += 1
+		pass
+	return -1
+
+func get_track_by_idx(idx: int) -> Control:
+	return track_list.get_child(idx)
+
 func get_pixels_per_unit() -> float:
 	return 50.0 * zoom
 
@@ -82,12 +94,17 @@ func _notification(what):
 	if what == NOTIFICATION_SORT_CHILDREN:
 		for c in get_children():
 			if c is not AudioClip: continue
+
+			var track = get_track_by_idx(c.track_idx)
+
+			if track == null: return
+
 			var pixels_per_unit := 50.0 * zoom
 			var start = ((c.start_time / time_interval) * pixels_per_unit) - time_offset
 			var width = (c.end_time - c.start_time) / time_interval * pixels_per_unit
 
-			c.position = Vector2(start, 0.0)
-			c.size = Vector2(width, c.size.y)
+			c.position = Vector2(start, track.global_position.y - global_position.y)
+			c.size = Vector2(width, track.size.y)
 
 func _gui_input(event):
 	var zoom_factor = 1.1