1 files changed, 196 insertions, 0 deletions
diff --git a/apps/web/src/components/editor/panels/properties/sections/blending.tsx b/apps/web/src/components/editor/panels/properties/sections/blending.tsx
new file mode 100644
index 00000000..430efa25
--- /dev/null
+++ b/apps/web/src/components/editor/panels/properties/sections/blending.tsx
@@ -0,0 +1,196 @@
+import { useEditor } from "@/hooks/use-editor";
+import { usePropertyDraft } from "../hooks/use-property-draft";
+import { clamp } from "@/utils/math";
+import { NumberField } from "@/components/ui/number-field";
+import {
+	DEFAULT_BLEND_MODE,
+	DEFAULT_OPACITY,
+} from "@/constants/timeline-constants";
+import { OcCheckerboardIcon } from "@opencut/ui/icons";
+import { Fragment, useRef } from "react";
+import { Section, SectionContent, SectionHeader } from "../section";
+import {
+	Select,
+	SelectContent,
+	SelectItem,
+	SelectSeparator,
+	SelectTrigger,
+	SelectValue,
+} from "@/components/ui/select";
+import type { BlendMode } from "@/types/rendering";
+import type { ElementType } from "@/types/timeline";
+import { HugeiconsIcon } from "@hugeicons/react";
+import { RainDropIcon } from "@hugeicons/core-free-icons";
+
+type BlendingElement = {
+	id: string;
+	opacity: number;
+	type: ElementType;
+	blendMode?: BlendMode;
+};
+
+const BLEND_MODE_GROUPS = [
+	[{ value: "normal", label: "Normal" }],
+	[
+		{ value: "darken", label: "Darken" },
+		{ value: "multiply", label: "Multiply" },
+		{ value: "color-burn", label: "Color Burn" },
+	],
+	[
+		{ value: "lighten", label: "Lighten" },
+		{ value: "screen", label: "Screen" },
+		{ value: "plus-lighter", label: "Plus Lighter" },
+		{ value: "color-dodge", label: "Color Dodge" },
+	],
+	[
+		{ value: "overlay", label: "Overlay" },
+		{ value: "soft-light", label: "Soft Light" },
+		{ value: "hard-light", label: "Hard Light" },
+	],
+	[
+		{ value: "difference", label: "Difference" },
+		{ value: "exclusion", label: "Exclusion" },
+	],
+	[
+		{ value: "hue", label: "Hue" },
+		{ value: "saturation", label: "Saturation" },
+		{ value: "color", label: "Color" },
+		{ value: "luminosity", label: "Luminosity" },
+	],
+];
+
+export function BlendingSection({
+	element,
+	trackId,
+}: {
+	element: BlendingElement;
+	trackId: string;
+}) {
+	const editor = useEditor();
+	const blendMode = element.blendMode ?? DEFAULT_BLEND_MODE;
+	const didSelectRef = useRef(false);
+	const committedBlendModeRef = useRef(blendMode);
+	if (!editor.timeline.isPreviewActive()) {
+		committedBlendModeRef.current = blendMode;
+	}
+
+	const previewBlendMode = (value: BlendMode) =>
+		editor.timeline.previewElements({
+			updates: [
+				{ trackId, elementId: element.id, updates: { blendMode: value } },
+			],
+		});
+
+	const commitBlendMode = (value: string) => {
+		if (editor.timeline.isPreviewActive()) {
+			editor.timeline.commitPreview();
+		} else {
+			editor.timeline.updateElements({
+				updates: [
+					{
+						trackId,
+						elementId: element.id,
+						updates: { blendMode: value as BlendMode },
+					},
+				],
+			});
+		}
+		didSelectRef.current = true;
+	};
+
+	const handleBlendModeOpenChange = (isOpen: boolean) => {
+		if (!isOpen) {
+			if (!didSelectRef.current) editor.timeline.discardPreview();
+			didSelectRef.current = false;
+		}
+	};
+
+	const opacity = usePropertyDraft({
+		displayValue: Math.round(element.opacity * 100).toString(),
+		parse: (input) => {
+			const parsed = parseFloat(input);
+			if (Number.isNaN(parsed)) return null;
+			return clamp({ value: parsed, min: 0, max: 100 }) / 100;
+		},
+		onPreview: (value) =>
+			editor.timeline.previewElements({
+				updates: [
+					{ trackId, elementId: element.id, updates: { opacity: value } },
+				],
+			}),
+		onCommit: () => editor.timeline.commitPreview(),
+	});
+
+	return (
+		<Section collapsible sectionKey={`${element.type}:blending`}>
+			<SectionHeader title="Blending" />
+			<SectionContent>
+				<div className="flex items-start gap-2">
+					<div className="w-1/2 space-y-1.5">
+						<NumberField
+							className="w-full"
+							icon={
+								<OcCheckerboardIcon className="size-3.5 text-muted-foreground" />
+							}
+							value={opacity.displayValue}
+							min={0}
+							max={100}
+							onFocus={opacity.onFocus}
+							onChange={opacity.onChange}
+							onBlur={opacity.onBlur}
+							onScrub={opacity.scrubTo}
+							onScrubEnd={opacity.commitScrub}
+							onReset={() =>
+								editor.timeline.updateElements({
+									updates: [
+										{
+											trackId,
+											elementId: element.id,
+											updates: { opacity: DEFAULT_OPACITY },
+										},
+									],
+								})
+							}
+							isDefault={element.opacity === DEFAULT_OPACITY}
+							dragSensitivity="slow"
+						/>
+					</div>
+					<div className="w-1/2 space-y-1.5">
+						<Select
+							value={committedBlendModeRef.current}
+							onOpenChange={handleBlendModeOpenChange}
+							onValueChange={commitBlendMode}
+						>
+							<SelectTrigger
+								icon={<HugeiconsIcon icon={RainDropIcon} />}
+								className="w-full"
+							>
+								<SelectValue placeholder="Select blend mode" />
+							</SelectTrigger>
+							<SelectContent className="w-36">
+								{BLEND_MODE_GROUPS.map((group, groupIndex) => (
+									<Fragment key={group[0]?.value ?? `group-${groupIndex}`}>
+										{group.map((option) => (
+											<SelectItem
+												key={option.value}
+												value={option.value}
+												onPointerEnter={() =>
+													previewBlendMode(option.value as BlendMode)
+												}
+											>
+												{option.label}
+											</SelectItem>
+										))}
+										{groupIndex < BLEND_MODE_GROUPS.length - 1 ? (
+											<SelectSeparator />
+										) : null}
+									</Fragment>
+								))}
+							</SelectContent>
+						</Select>
+					</div>
+				</div>
+			</SectionContent>
+		</Section>
+	);
+}