feat: move/resize multiple elements

3 files changed, 178 insertions, 213 deletions

diff --git a/apps/web/src/components/editor/panels/timeline/index.tsx b/apps/web/src/components/editor/panels/timeline/index.tsx
index ae9e19c9..20e9faf1 100644
--- a/apps/web/src/components/editor/panels/timeline/index.tsx
+++ b/apps/web/src/components/editor/panels/timeline/index.tsx
@@ -61,7 +61,6 @@ import { SELECTED_TRACK_ROW_CLASS } from "./theme";
 import {
 	computeTrackExpansionHeight,
 	getTrackExpandedRows,
-	getExpansionHeight,
 	getPropertyLabel,
 	type ExpandedRow,
 } from "./expanded-layout";
@@ -75,6 +74,7 @@ import { TimelineBookmarksRow } from "./bookmarks";
 import { useBookmarkDrag } from "@/hooks/timeline/use-bookmark-drag";
 import { useEdgeAutoScroll } from "@/hooks/timeline/use-edge-auto-scroll";
 import { useInitialScrollBottom } from "@/hooks/timeline/use-initial-scroll-bottom";
+import { useTimelineResize } from "@/hooks/timeline/use-timeline-resize";
 import { useTimelineStore } from "@/stores/timeline-store";
 import { useEditor } from "@/hooks/use-editor";
 import { useTimelinePlayhead } from "@/hooks/timeline/use-timeline-playhead";
@@ -119,7 +119,9 @@ export function Timeline() {
 	} = useElementSelection();
 	const editor = useEditor();
 	const timeline = editor.timeline;
-	const scene = useEditor((currentEditor) => currentEditor.scenes.getActiveSceneOrNull());
+	const scene = useEditor((currentEditor) =>
+		currentEditor.scenes.getActiveSceneOrNull(),
+	);
 	const tracks = useMemo<TimelineTrack[]>(
 		() =>
 			scene
@@ -140,7 +142,6 @@ export function Timeline() {
 	const playheadRef = useRef<HTMLDivElement>(null);
 	const trackLabelsScrollRef = useRef<HTMLDivElement>(null);
 
-	const [isResizing, setIsResizing] = useState(false);
 	const [currentSnapPoint, setCurrentSnapPoint] = useState<SnapPoint | null>(
 		null,
 	);
@@ -148,15 +149,6 @@ export function Timeline() {
 	const handleSnapPointChange = useCallback((snapPoint: SnapPoint | null) => {
 		setCurrentSnapPoint(snapPoint);
 	}, []);
-	const handleResizeStateChange = useCallback(
-		({ isResizing: nextIsResizing }: { isResizing: boolean }) => {
-			setIsResizing(nextIsResizing);
-			if (!nextIsResizing) {
-				setCurrentSnapPoint(null);
-			}
-		},
-		[],
-	);
 
 	const timelineDuration = timeline.getTotalDuration() || 0;
 	const minZoomLevel = getTimelineZoomMin({
@@ -176,6 +168,10 @@ export function Timeline() {
 			tracksScrollRef,
 			rulerScrollRef,
 		});
+	const { isResizing, handleResizeStart } = useTimelineResize({
+		zoomLevel,
+		onSnapPointChange: handleSnapPointChange,
+	});
 
 	const expandedElementIds = useTimelineStore((s) => s.expandedElementIds);
 
@@ -366,7 +362,10 @@ export function Timeline() {
 
 	const containerWidth =
 		tracksContainerRef.current?.clientWidth || FALLBACK_CONTAINER_WIDTH;
-	const contentWidth = timelineTimeToPixels({ time: timelineDuration, zoomLevel });
+	const contentWidth = timelineTimeToPixels({
+		time: timelineDuration,
+		zoomLevel,
+	});
 	const paddingPx = getTimelinePaddingPx({
 		containerWidth,
 		zoomLevel,
@@ -513,7 +512,10 @@ export function Timeline() {
 											TRACKS_CONTAINER_HEIGHT.min,
 											Math.min(
 												TRACKS_CONTAINER_HEIGHT.max,
-												getTotalTracksHeight({ tracks, getExtraHeight: getTrackExpansionHeight }),
+												getTotalTracksHeight({
+													tracks,
+													getExtraHeight: getTrackExpansionHeight,
+												}),
 											),
 										) + TIMELINE_CONTENT_TOP_PADDING_PX
 									}px`,
@@ -533,14 +535,13 @@ export function Timeline() {
 								}}
 							>
 								{tracks.length > 0 && (
-		<TimelineTrackRows
-					mainTrackId={mainTrackId}
+									<TimelineTrackRows
+										mainTrackId={mainTrackId}
 										zoomLevel={zoomLevel}
 										dragState={dragState}
 										tracksScrollRef={tracksScrollRef}
 										lastMouseXRef={lastMouseXRef}
-										onSnapPointChange={handleSnapPointChange}
-										onResizeStateChange={handleResizeStateChange}
+										onResizeStart={handleResizeStart}
 										onElementMouseDown={handleElementMouseDown}
 										onElementClick={handleElementClick}
 										onTrackMouseDown={(event) => {
@@ -718,8 +719,7 @@ function TimelineTrackRows({
 	dragState,
 	tracksScrollRef,
 	lastMouseXRef,
-	onSnapPointChange,
-	onResizeStateChange,
+	onResizeStart,
 	onElementMouseDown,
 	onElementClick,
 	onTrackMouseDown,
@@ -733,8 +733,9 @@ function TimelineTrackRows({
 	dragState: ElementDragState;
 	tracksScrollRef: React.RefObject<HTMLDivElement | null>;
 	lastMouseXRef: React.RefObject<number>;
-	onSnapPointChange: (snapPoint: SnapPoint | null) => void;
-	onResizeStateChange: (params: { isResizing: boolean }) => void;
+	onResizeStart: React.ComponentProps<
+		typeof TimelineTrackContent
+	>["onResizeStart"];
 	onElementMouseDown: React.ComponentProps<
 		typeof TimelineTrackContent
 	>["onElementMouseDown"];
@@ -798,8 +799,7 @@ function TimelineTrackRows({
 						<div
 							className={cn(
 								"absolute right-0 left-0 transition-colors",
-								tracksWithSelection.has(track.id) &&
-									SELECTED_TRACK_ROW_CLASS,
+								tracksWithSelection.has(track.id) && SELECTED_TRACK_ROW_CLASS,
 							)}
 							style={{
 								top: `${TIMELINE_CONTENT_TOP_PADDING_PX + getCumulativeHeightBefore({ tracks, trackIndex: index, getExtraHeight: getTrackExpansionHeight })}px`,
@@ -813,8 +813,7 @@ function TimelineTrackRows({
 								rulerScrollRef={tracksScrollRef}
 								tracksScrollRef={tracksScrollRef}
 								lastMouseXRef={lastMouseXRef}
-								onSnapPointChange={onSnapPointChange}
-								onResizeStateChange={onResizeStateChange}
+								onResizeStart={onResizeStart}
 								onElementMouseDown={onElementMouseDown}
 								onElementClick={onElementClick}
 								onTrackMouseDown={onTrackMouseDown}
@@ -929,12 +928,10 @@ function TrackToggleIcon({
 function PropertyTree({ rows }: { rows: ExpandedRow[] }) {
 	return (
 		<div className="flex flex-col overflow-hidden">
-			{rows.map((row, index) => (
+			{rows.map((row) => (
 				<div
 					key={row.propertyPath}
-					className={cn(
-						"flex shrink-0 items-center px-3 bg-muted/50",
-					)}
+					className={cn("flex shrink-0 items-center px-3 bg-muted/50")}
 					style={{ height: `${KEYFRAME_LANE_HEIGHT_PX}px` }}
 				>
 					<span className="text-muted-foreground truncate text-xs leading-none">
diff --git a/apps/web/src/components/editor/panels/timeline/timeline-element.tsx b/apps/web/src/components/editor/panels/timeline/timeline-element.tsx
index a3555e94..3ebd3efa 100644
--- a/apps/web/src/components/editor/panels/timeline/timeline-element.tsx
+++ b/apps/web/src/components/editor/panels/timeline/timeline-element.tsx
@@ -10,7 +10,6 @@ import {
 } from "@/hooks/timeline/element/use-keyframe-drag";
 import { useKeyframeSelection } from "@/hooks/timeline/element/use-keyframe-selection";
 import { useKeyframeBoxSelect } from "@/hooks/timeline/element/use-keyframe-box-select";
-import { useTimelineElementResize } from "@/hooks/timeline/element/use-element-resize";
 import { SelectionBox } from "@/lib/selection/selection-box";
 import { getElementKeyframes } from "@/lib/animation";
 import {
@@ -86,7 +85,6 @@ import {
 	getExpansionHeight,
 	type ExpandedRow,
 } from "./expanded-layout";
-import type { SnapPoint } from "@/lib/timeline/snap-utils";
 
 const KEYFRAME_INDICATOR_MIN_WIDTH_PX = 40;
 const ELEMENT_RING_WIDTH_PX = 1.5;
@@ -197,8 +195,12 @@ interface TimelineElementProps {
 	track: TimelineTrack;
 	zoomLevel: number;
 	isSelected: boolean;
-	onSnapPointChange?: (snapPoint: SnapPoint | null) => void;
-	onResizeStateChange?: (params: { isResizing: boolean }) => void;
+	onResizeStart: (params: {
+		event: React.MouseEvent;
+		element: TimelineElementType;
+		track: TimelineTrack;
+		side: "left" | "right";
+	}) => void;
 	onElementMouseDown: (
 		event: React.MouseEvent,
 		element: TimelineElementType,
@@ -216,8 +218,7 @@ export function TimelineElement({
 	track,
 	zoomLevel,
 	isSelected,
-	onSnapPointChange,
-	onResizeStateChange,
+	onResizeStart,
 	onElementMouseDown,
 	onElementClick,
 	dragState,
@@ -231,18 +232,6 @@ export function TimelineElement({
 		elementId: element.id,
 		fallback: element,
 	});
-	const {
-		currentDuration,
-		currentStartTime,
-		handleResizeStart,
-		isResizing,
-	} = useTimelineElementResize({
-		element,
-		track,
-		zoomLevel,
-		onSnapPointChange,
-		onResizeStateChange,
-	});
 
 	let mediaAsset: MediaAsset | null = null;
 
@@ -267,13 +256,9 @@ export function TimelineElement({
 	const elementStartTime =
 		isBeingDragged && dragState.isDragging
 			? dragState.currentTime + dragTimeOffset
-			: isResizing
-				? currentStartTime
-				: renderElement.startTime;
+			: renderElement.startTime;
 	const displayedStartTime = elementStartTime;
-	const displayedDuration = isResizing
-		? currentDuration
-		: renderElement.duration;
+	const displayedDuration = renderElement.duration;
 	const elementWidth = timelineTimeToPixels({
 		time: displayedDuration,
 		zoomLevel,
@@ -282,22 +267,6 @@ export function TimelineElement({
 		time: displayedStartTime,
 		zoomLevel,
 	});
-	const handleElementResizeStart = ({
-		event,
-		element,
-		side,
-	}: {
-		event: React.MouseEvent;
-		element: TimelineElementType;
-		track: TimelineTrack;
-		side: "left" | "right";
-	}) => {
-		handleResizeStart({
-			event,
-			elementId: element.id,
-			side,
-		});
-	};
 	const keyframeIndicators = isSelected
 		? getKeyframeIndicators({
 				keyframes: getElementKeyframes({ animations: element.animations }),
@@ -329,9 +298,7 @@ export function TimelineElement({
 	);
 	const expandedRows = useMemo(
 		() =>
-			isExpanded
-				? getExpandedRows({ animations: element.animations })
-				: [],
+			isExpanded ? getExpandedRows({ animations: element.animations }) : [],
 		[isExpanded, element.animations],
 	);
 
@@ -422,7 +389,7 @@ export function TimelineElement({
 						expandedContent={expandedContent}
 						onElementClick={onElementClick}
 						onElementMouseDown={onElementMouseDown}
-						onResizeStart={handleElementResizeStart}
+						onResizeStart={onResizeStart}
 						isDropTarget={isDropTarget}
 					/>
 					{isSelected && (
@@ -811,8 +778,7 @@ function ExpandedKeyframeLanes({
 			[...keyframes]
 				.sort(
 					(a, b) =>
-						a.time - b.time ||
-						a.propertyPath.localeCompare(b.propertyPath),
+						a.time - b.time || a.propertyPath.localeCompare(b.propertyPath),
 				)
 				.map((kf) => ({
 					trackId,
@@ -824,6 +790,8 @@ function ExpandedKeyframeLanes({
 	);
 
 	return (
+		// biome-ignore lint/a11y/noStaticElementInteractions: expanded keyframe lanes are a pointer-only editing surface
+		// biome-ignore lint/a11y/useKeyWithClickEvents: expanded keyframe lanes are a pointer-only editing surface
 		<div
 			ref={containerRef}
 			className="relative flex flex-col"
@@ -837,9 +805,7 @@ function ExpandedKeyframeLanes({
 				return (
 					<div
 						key={row.propertyPath}
-						className={cn(
-							"relative flex items-center bg-muted/50",
-						)}
+						className={cn("relative flex items-center bg-muted/50")}
 						style={{ height: `${KEYFRAME_LANE_HEIGHT_PX}px` }}
 					>
 						{laneKeyframes.map((kf) => {
@@ -849,8 +815,9 @@ function ExpandedKeyframeLanes({
 								propertyPath: row.propertyPath,
 								keyframeId: kf.id,
 							};
-							const isBeingDragged =
-								keyframeDragState.draggingKeyframeIds.has(kf.id);
+							const isBeingDragged = keyframeDragState.draggingKeyframeIds.has(
+								kf.id,
+							);
 							const kfLeft = timelineTimeToSnappedPixels({
 								time: displayedStartTime + kf.time,
 								zoomLevel,
@@ -898,9 +865,7 @@ function ExpandedKeyframeLanes({
 										icon={KeyframeIcon}
 										className={cn(
 											"size-3.5 text-black mr-1",
-											isSelected
-												? "fill-primary"
-												: "fill-white",
+											isSelected ? "fill-primary" : "fill-white",
 										)}
 										strokeWidth={1.5}
 									/>
diff --git a/apps/web/src/components/editor/panels/timeline/timeline-track.tsx b/apps/web/src/components/editor/panels/timeline/timeline-track.tsx
index 888e1496..32b1b93d 100644
--- a/apps/web/src/components/editor/panels/timeline/timeline-track.tsx
+++ b/apps/web/src/components/editor/panels/timeline/timeline-track.tsx
@@ -1,129 +1,132 @@
-"use client";

-

-import { useElementSelection } from "@/hooks/timeline/element/use-element-selection";

-import { TimelineElement } from "./timeline-element";

-import type { TimelineTrack } from "@/lib/timeline";

-import type { TimelineElement as TimelineElementType } from "@/lib/timeline";

-import type { SnapPoint } from "@/lib/timeline/snap-utils";

-import { TIMELINE_LAYERS } from "./layers";

-import { BASE_TIMELINE_PIXELS_PER_SECOND } from "@/lib/timeline/scale";

-import { useEdgeAutoScroll } from "@/hooks/timeline/use-edge-auto-scroll";

-import type { ElementDragState } from "@/lib/timeline";

-import { useEditor } from "@/hooks/use-editor";

-

-interface TimelineTrackContentProps {

-	track: TimelineTrack;

-	zoomLevel: number;

-	dragState: ElementDragState;

-	rulerScrollRef: React.RefObject<HTMLDivElement | null>;

-	tracksScrollRef: React.RefObject<HTMLDivElement | null>;

-	lastMouseXRef: React.RefObject<number>;

-	onSnapPointChange?: (snapPoint: SnapPoint | null) => void;

-	onResizeStateChange?: (params: { isResizing: boolean }) => void;

-	onElementMouseDown: (params: {

-		event: React.MouseEvent;

-		element: TimelineElementType;

-		track: TimelineTrack;

-	}) => void;

-	onElementClick: (params: {

-		event: React.MouseEvent;

-		element: TimelineElementType;

-		track: TimelineTrack;

-	}) => void;

-	onTrackMouseDown?: (event: React.MouseEvent) => void;

-	onTrackMouseUp?: (event: React.MouseEvent) => void;

-	shouldIgnoreClick?: () => boolean;

-	targetElementId?: string | null;

-}

-

-export function TimelineTrackContent({

-	track,

-	zoomLevel,

-	dragState,

-	rulerScrollRef,

-	tracksScrollRef,

-	lastMouseXRef,

-	onSnapPointChange,

-	onResizeStateChange,

-	onElementMouseDown,

-	onElementClick,

-	onTrackMouseDown,

-	onTrackMouseUp,

-	shouldIgnoreClick,

-	targetElementId = null,

-}: TimelineTrackContentProps) {

-	const { isElementSelected } = useElementSelection();

-	const duration = useEditor((e) => e.timeline.getTotalDuration());

-

-	useEdgeAutoScroll({

-		isActive: dragState.isDragging,

-		getMouseClientX: () => lastMouseXRef.current ?? 0,

-		rulerScrollRef,

-		tracksScrollRef,

-		contentWidth: duration * BASE_TIMELINE_PIXELS_PER_SECOND * zoomLevel,

-	});

-

-	return (

-		<div className="relative size-full">

-			<button

-				type="button"

-				className="absolute inset-0 m-0 size-full appearance-none border-0 bg-transparent p-0"

-				aria-label={`Select ${track.name} track`}

-			onMouseUp={(event) => {

-					if (shouldIgnoreClick?.()) return;

-				onTrackMouseUp?.(event);

-				}}

-				onMouseDown={(event) => {

-					event.preventDefault();

-					onTrackMouseDown?.(event);

-				}}

-			/>

-			{/* biome-ignore lint/a11y/noStaticElementInteractions: empty track area is a pointer-only seek surface */}

-			<div

-				className="relative h-full min-w-full"

-				style={{ zIndex: TIMELINE_LAYERS.trackContent }}

-				onMouseUp={(event) => {

-					if (event.target !== event.currentTarget) return;

-					if (shouldIgnoreClick?.()) return;

-					onTrackMouseUp?.(event);

-				}}

-				onMouseDown={(event) => {

-					if (event.target !== event.currentTarget) return;

-					event.preventDefault();

-					onTrackMouseDown?.(event);

-				}}

-			>

-				{track.elements.length === 0 ? (

-					<div className="text-muted-foreground border-muted/30 pointer-events-none flex size-full items-center justify-center rounded-sm border-2 border-dashed text-xs" />

-				) : (

-					track.elements.map((element) => {

-						const isSelected = isElementSelected({

-							trackId: track.id,

-							elementId: element.id,

-						});

-

-						return (

-							<TimelineElement

-								key={element.id}

-								element={element}

-								track={track}

-								zoomLevel={zoomLevel}

-								isSelected={isSelected}

-								onSnapPointChange={onSnapPointChange}

-								onResizeStateChange={onResizeStateChange}

-								onElementMouseDown={(event, element) =>

-									onElementMouseDown({ event, element, track })

-								}

-								onElementClick={(event, element) =>

-									onElementClick({ event, element, track })

-								}

-								dragState={dragState}

-								isDropTarget={element.id === targetElementId}

-							/>

-						);

-					})

-				)}

-			</div>

-		</div>

-	);

-}

+"use client";
+
+import { useElementSelection } from "@/hooks/timeline/element/use-element-selection";
+import { TimelineElement } from "./timeline-element";
+import type { TimelineTrack } from "@/lib/timeline";
+import type { TimelineElement as TimelineElementType } from "@/lib/timeline";
+import { TIMELINE_LAYERS } from "./layers";
+import { BASE_TIMELINE_PIXELS_PER_SECOND } from "@/lib/timeline/scale";
+import { useEdgeAutoScroll } from "@/hooks/timeline/use-edge-auto-scroll";
+import type { ElementDragState } from "@/lib/timeline";
+import { useEditor } from "@/hooks/use-editor";
+
+interface TimelineTrackContentProps {
+	track: TimelineTrack;
+	zoomLevel: number;
+	dragState: ElementDragState;
+	rulerScrollRef: React.RefObject<HTMLDivElement | null>;
+	tracksScrollRef: React.RefObject<HTMLDivElement | null>;
+	lastMouseXRef: React.RefObject<number>;
+	onResizeStart: (params: {
+		event: React.MouseEvent;
+		element: TimelineElementType;
+		track: TimelineTrack;
+		side: "left" | "right";
+	}) => void;
+	onElementMouseDown: (params: {
+		event: React.MouseEvent;
+		element: TimelineElementType;
+		track: TimelineTrack;
+	}) => void;
+	onElementClick: (params: {
+		event: React.MouseEvent;
+		element: TimelineElementType;
+		track: TimelineTrack;
+	}) => void;
+	onTrackMouseDown?: (event: React.MouseEvent) => void;
+	onTrackMouseUp?: (event: React.MouseEvent) => void;
+	shouldIgnoreClick?: () => boolean;
+	targetElementId?: string | null;
+}
+
+export function TimelineTrackContent({
+	track,
+	zoomLevel,
+	dragState,
+	rulerScrollRef,
+	tracksScrollRef,
+	lastMouseXRef,
+	onResizeStart,
+	onElementMouseDown,
+	onElementClick,
+	onTrackMouseDown,
+	onTrackMouseUp,
+	shouldIgnoreClick,
+	targetElementId = null,
+}: TimelineTrackContentProps) {
+	const { isElementSelected } = useElementSelection();
+	const duration = useEditor((e) => e.timeline.getTotalDuration());
+
+	useEdgeAutoScroll({
+		isActive: dragState.isDragging,
+		getMouseClientX: () => lastMouseXRef.current ?? 0,
+		rulerScrollRef,
+		tracksScrollRef,
+		contentWidth: duration * BASE_TIMELINE_PIXELS_PER_SECOND * zoomLevel,
+	});
+
+	return (
+		<div className="relative size-full">
+			<button
+				type="button"
+				className="absolute inset-0 m-0 size-full appearance-none border-0 bg-transparent p-0"
+				aria-label={`Select ${track.name} track`}
+				onMouseUp={(event) => {
+					if (shouldIgnoreClick?.()) return;
+					onTrackMouseUp?.(event);
+				}}
+				onMouseDown={(event) => {
+					event.preventDefault();
+					onTrackMouseDown?.(event);
+				}}
+			/>
+			{/* biome-ignore lint/a11y/noStaticElementInteractions: empty track area is a pointer-only seek surface */}
+			<div
+				className="relative h-full min-w-full"
+				style={{ zIndex: TIMELINE_LAYERS.trackContent }}
+				onMouseUp={(event) => {
+					if (event.target !== event.currentTarget) return;
+					if (shouldIgnoreClick?.()) return;
+					onTrackMouseUp?.(event);
+				}}
+				onMouseDown={(event) => {
+					if (event.target !== event.currentTarget) return;
+					event.preventDefault();
+					onTrackMouseDown?.(event);
+				}}
+			>
+				{track.elements.length === 0 ? (
+					<div className="text-muted-foreground border-muted/30 pointer-events-none flex size-full items-center justify-center rounded-sm border-2 border-dashed text-xs" />
+				) : (
+					track.elements.map((element) => {
+						const isSelected = isElementSelected({
+							trackId: track.id,
+							elementId: element.id,
+						});
+
+						return (
+							<TimelineElement
+								key={element.id}
+								element={element}
+								track={track}
+								zoomLevel={zoomLevel}
+								isSelected={isSelected}
+								onResizeStart={({ event, element, side }) =>
+									onResizeStart({ event, element, track, side })
+								}
+								onElementMouseDown={(event, element) =>
+									onElementMouseDown({ event, element, track })
+								}
+								onElementClick={(event, element) =>
+									onElementClick({ event, element, track })
+								}
+								dragState={dragState}
+								isDropTarget={element.id === targetElementId}
+							/>
+						);
+					})
+				)}
+			</div>
+		</div>
+	);
+}