Xiaohan-Tian
75 lines
2.6 KiB
TypeScript
75 lines
2.6 KiB
TypeScript
import { KGCommand } from '../KGCommand';
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import { KGCore } from '../../KGCore';
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import { GlobalTrackType } from '../../global-track';
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import { KGTempoRegion } from '../../region/KGTempoRegion';
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import {
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findGlobalTrackByType,
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getRequiredMaxBarsForAudioRegions,
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normalizeTempoRegionsForProject,
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restoreAudioRegionLengths,
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syncAudioRegionLengthsToPlaybackDuration,
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type AudioRegionLengthSnapshot,
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} from '../../../util/globalTrackUtil';
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export class UpdateTempoRegionCommand extends KGCommand {
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private readonly regionId: string;
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private readonly nextBpm: number;
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private previousBpm: number | null = null;
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private previousMaxBars: number | null = null;
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private nextMaxBars: number | null = null;
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private targetRegion: KGTempoRegion | null = null;
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private audioRegionLengthSnapshots: AudioRegionLengthSnapshot[] = [];
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constructor(regionId: string, nextBpm: number) {
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super();
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this.regionId = regionId;
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this.nextBpm = nextBpm;
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}
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execute(): void {
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const project = KGCore.instance().getCurrentProject();
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const track = findGlobalTrackByType(project, GlobalTrackType.Tempo);
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if (!track) {
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throw new Error('Tempo global track not found');
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}
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const region = track.getRegions().find(candidate => candidate.getId() === this.regionId);
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if (!(region instanceof KGTempoRegion)) {
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throw new Error(`Tempo region with ID ${this.regionId} not found`);
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}
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this.targetRegion = region;
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this.previousBpm = region.getBpm();
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this.previousMaxBars = project.getMaxBars();
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region.setBpm(this.nextBpm);
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this.audioRegionLengthSnapshots = syncAudioRegionLengthsToPlaybackDuration(project);
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const requiredMaxBars = getRequiredMaxBarsForAudioRegions(project);
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this.nextMaxBars = Math.max(project.getMaxBars(), requiredMaxBars);
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if (this.nextMaxBars > project.getMaxBars()) {
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project.setMaxBars(this.nextMaxBars);
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normalizeTempoRegionsForProject(project);
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}
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}
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undo(): void {
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if (!this.targetRegion || this.previousBpm === null || this.previousMaxBars === null) {
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throw new Error('Cannot undo tempo update without previous state');
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}
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const project = KGCore.instance().getCurrentProject();
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this.targetRegion.setBpm(this.previousBpm);
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if (project.getMaxBars() !== this.previousMaxBars) {
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project.setMaxBars(this.previousMaxBars);
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normalizeTempoRegionsForProject(project);
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}
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if (this.audioRegionLengthSnapshots.length > 0) {
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restoreAudioRegionLengths(this.audioRegionLengthSnapshots);
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}
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}
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getDescription(): string {
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return `Change tempo to "${this.nextBpm} BPM"`;
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}
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}
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