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|
import {
Command,
createElementSelectionResult,
type CommandResult,
} from "@/commands/base-command";
import { EditorCore } from "@/core";
import type { SceneTracks, TimelineElement, TimelineTrack } from "@/timeline";
import {
buildEmptyTrack,
validateElementTrackCompatibility,
} from "@/timeline/placement";
import type {
PlannedElementMove,
PlannedTrackCreation,
} from "@/timeline/group-move";
import { findTrackInSceneTracks } from "@/timeline/track-element-update";
export class MoveElementCommand extends Command {
private savedState: SceneTracks | null = null;
constructor({
moves,
createTracks = [],
}: {
moves: PlannedElementMove[];
createTracks?: PlannedTrackCreation[];
}) {
super();
this.moves = moves;
this.createTracks = createTracks;
}
private readonly moves: PlannedElementMove[];
private readonly createTracks: PlannedTrackCreation[];
execute(): CommandResult | undefined {
const editor = EditorCore.getInstance();
this.savedState = editor.scenes.getActiveScene().tracks;
let tracksToUpdate = this.savedState;
for (const createTrack of [...this.createTracks].sort(
(firstTrack, secondTrack) => firstTrack.index - secondTrack.index,
)) {
tracksToUpdate = insertTrackAtDisplayIndex({
tracks: tracksToUpdate,
track: buildEmptyTrack({
id: createTrack.id,
type: createTrack.type,
}),
insertIndex: createTrack.index,
});
}
const movedElementsById = new Map<string, TimelineElement>();
for (const move of this.moves) {
const sourceTrack = findTrackInSceneTracks({
tracks: this.savedState,
trackId: move.sourceTrackId,
});
const sourceElement = sourceTrack?.elements.find(
(trackElement) => trackElement.id === move.elementId,
);
if (!sourceTrack || !sourceElement) {
throw new Error("Source track or element not found");
}
const targetTrack = findTrackInSceneTracks({
tracks: tracksToUpdate,
trackId: move.targetTrackId,
});
if (!targetTrack) {
throw new Error("Target track not found");
}
const validation = validateElementTrackCompatibility({
element: sourceElement,
track: targetTrack,
});
if (!validation.isValid) {
throw new Error(validation.errorMessage);
}
movedElementsById.set(move.elementId, {
...sourceElement,
startTime: move.newStartTime,
});
}
const movedElementIds = new Set(this.moves.map((move) => move.elementId));
const movedElementsByTargetTrackId = new Map<string, TimelineElement[]>();
for (const move of this.moves) {
const movedElement = movedElementsById.get(move.elementId);
if (!movedElement) {
continue;
}
const nextTargetElements =
movedElementsByTargetTrackId.get(move.targetTrackId) ?? [];
nextTargetElements.push(movedElement);
movedElementsByTargetTrackId.set(move.targetTrackId, nextTargetElements);
}
const updatedTracks = mapSceneTracks({
tracks: tracksToUpdate,
update: (track) => ({
...track,
elements: [
...track.elements.filter(
(element) => !movedElementIds.has(element.id),
),
...(movedElementsByTargetTrackId.get(track.id) ?? []),
],
}),
});
editor.timeline.updateTracks(updatedTracks);
return createElementSelectionResult(
this.moves.map(({ elementId, targetTrackId }) => ({
trackId: targetTrackId,
elementId,
})),
);
}
undo(): void {
if (this.savedState) {
const editor = EditorCore.getInstance();
editor.timeline.updateTracks(this.savedState);
}
}
}
function mapSceneTracks({
tracks,
update,
}: {
tracks: SceneTracks;
update: <TTrack extends TimelineTrack>(track: TTrack) => TTrack;
}): SceneTracks {
return {
overlay: tracks.overlay.map((track) => update(track)),
main: update(tracks.main),
audio: tracks.audio.map((track) => update(track)),
};
}
function insertTrackAtDisplayIndex({
tracks,
track,
insertIndex,
}: {
tracks: SceneTracks;
track: TimelineTrack;
insertIndex: number;
}): SceneTracks {
if (track.type === "audio") {
const audioInsertIndex = Math.max(
0,
Math.min(insertIndex - tracks.overlay.length - 1, tracks.audio.length),
);
return {
...tracks,
audio: [
...tracks.audio.slice(0, audioInsertIndex),
track,
...tracks.audio.slice(audioInsertIndex),
],
};
}
const overlayInsertIndex = Math.max(
0,
Math.min(insertIndex, tracks.overlay.length),
);
return {
...tracks,
overlay: [
...tracks.overlay.slice(0, overlayInsertIndex),
track,
...tracks.overlay.slice(overlayInsertIndex),
],
};
}
|
