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import { EditorCore } from "@/core";
import { clampRetimeRate } from "@/lib/retime/rate";
import { clampAnimationsToDuration } from "@/lib/animation";
import { Command, type CommandResult } from "@/lib/commands/base-command";
import { getTimelineDurationForSourceSpan, getSourceSpanAtClipTime } from "@/lib/retime";
import { isRetimableElement, updateElementInTracks } from "@/lib/timeline";
import type { RetimeConfig, TimelineTrack } from "@/lib/timeline";
function getSourceDuration({
trimStart,
trimEnd,
duration,
sourceDuration,
retime,
}: {
trimStart: number;
trimEnd: number;
duration: number;
sourceDuration?: number;
retime?: RetimeConfig;
}): number {
if (typeof sourceDuration === "number") {
return sourceDuration;
}
return (
trimStart +
getSourceSpanAtClipTime({
clipTime: duration,
retime,
}) +
trimEnd
);
}
export class UpdateElementRetimeCommand extends Command {
private savedState: TimelineTrack[] | null = null;
private readonly trackId: string;
private readonly elementId: string;
private readonly retime: RetimeConfig | undefined;
constructor({
trackId,
elementId,
retime,
}: {
trackId: string;
elementId: string;
retime?: RetimeConfig;
}) {
super();
this.trackId = trackId;
this.elementId = elementId;
this.retime = retime;
}
execute(): CommandResult | undefined {
const editor = EditorCore.getInstance();
this.savedState = editor.timeline.getTracks();
const updatedTracks = updateElementInTracks({
tracks: this.savedState,
trackId: this.trackId,
elementId: this.elementId,
elementPredicate: isRetimableElement,
update: (element) => {
if (!isRetimableElement(element)) {
return element;
}
const nextRetime = this.retime
? {
...this.retime,
rate: clampRetimeRate({ rate: this.retime.rate }),
}
: undefined;
const sourceDuration = getSourceDuration({
trimStart: element.trimStart,
trimEnd: element.trimEnd,
duration: element.duration,
sourceDuration: element.sourceDuration,
retime: element.retime,
});
const visibleSourceSpan = Math.max(
0,
sourceDuration - element.trimStart - element.trimEnd,
);
const nextDuration = getTimelineDurationForSourceSpan({
sourceSpan: visibleSourceSpan,
retime: nextRetime,
});
return {
...element,
retime: nextRetime,
duration: nextDuration,
animations: clampAnimationsToDuration({
animations: element.animations,
duration: nextDuration,
}),
};
},
});
editor.timeline.updateTracks(updatedTracks);
return undefined;
}
undo(): void {
if (this.savedState) {
const editor = EditorCore.getInstance();
editor.timeline.updateTracks(this.savedState);
}
}
}
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