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import { getKeyframeById } from "@/animation";
import type { SelectedKeyframeRef } from "@/animation/types";
import type { TimelineElement } from "@/timeline";
import { PasteKeyframesCommand } from "@/commands/timeline";
import type {
ClipboardHandler,
KeyframeClipboardCurvePatch,
KeyframeClipboardItem,
} from "../types";
function resolveSingleSourceElement({
selectedKeyframes,
}: {
selectedKeyframes: SelectedKeyframeRef[];
}) {
const firstKeyframe = selectedKeyframes[0];
if (!firstKeyframe) {
return null;
}
const sourceElement = {
trackId: firstKeyframe.trackId,
elementId: firstKeyframe.elementId,
};
const isSingleSource = selectedKeyframes.every(
(keyframe) =>
keyframe.trackId === sourceElement.trackId &&
keyframe.elementId === sourceElement.elementId,
);
return isSingleSource ? sourceElement : null;
}
function getCurvePatches({
element,
propertyPath,
keyframeId,
}: {
element: TimelineElement;
propertyPath: KeyframeClipboardItem["propertyPath"];
keyframeId: string;
}): KeyframeClipboardCurvePatch[] {
const binding = element.animations?.bindings[propertyPath];
if (!binding) {
return [];
}
return binding.components.flatMap((component) => {
const channel = element.animations?.channels[component.channelId];
if (channel?.kind !== "scalar") {
return [];
}
const keyframe = channel.keys.find(
(candidate) => candidate.id === keyframeId,
);
if (!keyframe) {
return [];
}
return [
{
componentKey: component.key,
patch: {
leftHandle: keyframe.leftHandle ?? null,
rightHandle: keyframe.rightHandle ?? null,
segmentToNext: keyframe.segmentToNext,
tangentMode: keyframe.tangentMode,
},
},
];
});
}
function buildClipboardItem({
element,
propertyPath,
keyframeId,
}: {
element: TimelineElement;
propertyPath: KeyframeClipboardItem["propertyPath"];
keyframeId: string;
}): (Omit<KeyframeClipboardItem, "timeOffset"> & { time: number }) | null {
const keyframe = getKeyframeById({
animations: element.animations,
propertyPath,
keyframeId,
});
if (!keyframe) {
return null;
}
return {
propertyPath,
time: keyframe.time,
value: keyframe.value,
interpolation: keyframe.interpolation,
curvePatches: getCurvePatches({
element,
propertyPath,
keyframeId,
}),
};
}
export const KeyframesClipboardHandler = {
type: "keyframes",
canCopy({ selectedKeyframes }) {
return selectedKeyframes.length > 0;
},
copy({ editor, selectedKeyframes }) {
const sourceElement = resolveSingleSourceElement({ selectedKeyframes });
if (!sourceElement) {
return null;
}
const [result] = editor.timeline.getElementsWithTracks({
elements: [sourceElement],
});
if (!result) {
return null;
}
const rawItems = selectedKeyframes.flatMap((keyframeRef) => {
const item = buildClipboardItem({
element: result.element,
propertyPath: keyframeRef.propertyPath,
keyframeId: keyframeRef.keyframeId,
});
return item ? [item] : [];
});
if (rawItems.length === 0) {
return null;
}
const minTime = Math.min(...rawItems.map((item) => item.time));
const items = rawItems
.map(({ time, ...item }) => ({
...item,
timeOffset: time - minTime,
}))
.sort(
(left, right) =>
left.timeOffset - right.timeOffset ||
left.propertyPath.localeCompare(right.propertyPath),
);
return {
type: "keyframes",
sourceElement,
items,
};
},
paste(entry, { selectedElements, time }) {
const targetElement = selectedElements[0];
if (!targetElement || entry.items.length === 0) {
return null;
}
return new PasteKeyframesCommand({
trackId: targetElement.trackId,
elementId: targetElement.elementId,
time,
clipboardItems: entry.items,
});
},
} satisfies ClipboardHandler<"keyframes">;
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