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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 { isRetimableElement } from "@/timeline";
import { splitAnimationsAtTime } from "@/animation";
import { getSourceSpanAtClipTime } from "@/retime";
export class SplitElementsCommand extends Command {
private savedState: SceneTracks | null = null;
private rightSideElements: { trackId: string; elementId: string }[] = [];
private readonly elements: { trackId: string; elementId: string }[];
private readonly splitTime: number;
private readonly retainSide: "both" | "left" | "right";
constructor({
elements,
splitTime,
retainSide = "both",
}: {
elements: { trackId: string; elementId: string }[];
splitTime: number;
retainSide?: "both" | "left" | "right";
}) {
super();
this.elements = elements;
this.splitTime = splitTime;
this.retainSide = retainSide;
}
getRightSideElements(): { trackId: string; elementId: string }[] {
return this.rightSideElements;
}
execute(): CommandResult | undefined {
const editor = EditorCore.getInstance();
this.savedState = editor.scenes.getActiveScene().tracks;
this.rightSideElements = [];
const splitTrack = <
TTrack extends { id: string; elements: TimelineElement[] },
>(
track: TTrack,
): TTrack => {
const elementsToSplit = this.elements.filter(
(target) => target.trackId === track.id,
);
if (elementsToSplit.length === 0) {
return track;
}
const elements = track.elements.flatMap((element) => {
const shouldSplit = elementsToSplit.some(
(target) => target.elementId === element.id,
);
if (!shouldSplit) {
return [element];
}
const effectiveStart = element.startTime;
const effectiveEnd = element.startTime + element.duration;
if (
this.splitTime <= effectiveStart ||
this.splitTime >= effectiveEnd
) {
return [element];
}
const relativeTime = this.splitTime - element.startTime;
const leftVisibleDuration = relativeTime;
const rightVisibleDuration = element.duration - relativeTime;
const retimeRef = isRetimableElement(element)
? element.retime
: undefined;
const leftSourceSpan = getSourceSpanAtClipTime({
clipTime: leftVisibleDuration,
retime: retimeRef,
});
const totalSourceSpan = getSourceSpanAtClipTime({
clipTime: element.duration,
retime: retimeRef,
});
const rightSourceSpan = totalSourceSpan - leftSourceSpan;
const { leftAnimations, rightAnimations } = splitAnimationsAtTime({
animations: element.animations,
splitTime: relativeTime,
shouldIncludeSplitBoundary: true,
});
let splitResult: TimelineElement[];
if (this.retainSide === "left") {
splitResult = [
{
...element,
duration: leftVisibleDuration,
trimEnd: element.trimEnd + rightSourceSpan,
name: `${element.name} (left)`,
animations: leftAnimations,
...(retimeRef !== undefined ? { retime: retimeRef } : {}),
},
];
} else if (this.retainSide === "right") {
const newId = generateUUID();
this.rightSideElements.push({
trackId: track.id,
elementId: newId,
});
splitResult = [
{
...element,
id: newId,
startTime: this.splitTime,
duration: rightVisibleDuration,
trimStart: element.trimStart + leftSourceSpan,
name: `${element.name} (right)`,
animations: rightAnimations,
...(retimeRef !== undefined ? { retime: retimeRef } : {}),
},
];
} else {
// "both" - split into two pieces
const secondElementId = generateUUID();
this.rightSideElements.push({
trackId: track.id,
elementId: secondElementId,
});
splitResult = [
{
...element,
duration: leftVisibleDuration,
trimEnd: element.trimEnd + rightSourceSpan,
name: `${element.name} (left)`,
animations: leftAnimations,
...(retimeRef !== undefined ? { retime: retimeRef } : {}),
},
{
...element,
id: secondElementId,
startTime: this.splitTime,
duration: rightVisibleDuration,
trimStart: element.trimStart + leftSourceSpan,
name: `${element.name} (right)`,
animations: rightAnimations,
...(retimeRef !== undefined ? { retime: retimeRef } : {}),
},
];
}
return splitResult;
});
return { ...track, elements } as TTrack;
};
const updatedTracks: SceneTracks = {
overlay: this.savedState.overlay.map((track) => splitTrack(track)),
main: splitTrack(this.savedState.main),
audio: this.savedState.audio.map((track) => splitTrack(track)),
};
editor.timeline.updateTracks(updatedTracks);
if (this.rightSideElements.length > 0) {
return createElementSelectionResult(this.rightSideElements);
}
return undefined;
}
undo(): void {
if (this.savedState) {
const editor = EditorCore.getInstance();
editor.timeline.updateTracks(this.savedState);
}
}
}
|
