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import {
Command,
createElementSelectionResult,
type CommandResult,
} from "@/commands/base-command";
import type { SceneTracks, TimelineElement } from "@/timeline";
import { generateUUID } from "@/utils/id";
import { EditorCore } from "@/core";
import { applyPlacement, resolveTrackPlacement } from "@/timeline/placement";
import { cloneAnimations } from "@/animation";
interface DuplicateElementsParams {
elements: { trackId: string; elementId: string }[];
}
export class DuplicateElementsCommand extends Command {
private duplicatedElements: { trackId: string; elementId: string }[] = [];
private savedState: SceneTracks | null = null;
private elements: DuplicateElementsParams["elements"];
constructor({ elements }: DuplicateElementsParams) {
super();
this.elements = elements;
}
execute(): CommandResult | undefined {
const editor = EditorCore.getInstance();
this.savedState = editor.scenes.getActiveScene().tracks;
this.duplicatedElements = [];
let updatedTracks = this.savedState;
for (const track of [
...this.savedState.overlay,
this.savedState.main,
...this.savedState.audio,
]) {
const elementsToDuplicate = this.elements.filter(
(elementEntry) => elementEntry.trackId === track.id,
);
if (elementsToDuplicate.length === 0) {
continue;
}
const elementIdsToDuplicate = new Set(
elementsToDuplicate.map((element) => element.elementId),
);
const newTrackElements: TimelineElement[] = [];
for (const element of track.elements) {
if (!elementIdsToDuplicate.has(element.id)) {
continue;
}
const newId = generateUUID();
newTrackElements.push(
buildDuplicateElement({
element,
id: newId,
startTime: element.startTime,
}),
);
}
const placementResult = resolveTrackPlacement({
tracks: updatedTracks,
trackType: track.type,
timeSpans: [],
strategy: { type: "alwaysNew", position: "highest" },
});
if (!placementResult || placementResult.kind !== "newTrack") {
continue;
}
const applied = applyPlacement({
tracks: updatedTracks,
placementResult,
elements: newTrackElements,
});
if (!applied) {
continue;
}
updatedTracks = applied.updatedTracks;
for (const element of newTrackElements) {
this.duplicatedElements.push({
trackId: applied.targetTrackId,
elementId: element.id,
});
}
}
editor.timeline.updateTracks(updatedTracks);
if (this.duplicatedElements.length > 0) {
return createElementSelectionResult(this.duplicatedElements);
}
return undefined;
}
undo(): void {
if (this.savedState) {
const editor = EditorCore.getInstance();
editor.timeline.updateTracks(this.savedState);
}
}
getDuplicatedElements(): { trackId: string; elementId: string }[] {
return this.duplicatedElements;
}
}
function buildDuplicateElement({
element,
id,
startTime,
}: {
element: TimelineElement;
id: string;
startTime: number;
}): TimelineElement {
return {
...element,
id,
name: `${element.name} (copy)`,
startTime,
animations: cloneAnimations({
animations: element.animations,
shouldRegenerateKeyframeIds: true,
}),
};
}
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