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import { EditorCore } from "@/core";
import {
getChannel,
getChannelValueAtTime,
removeElementKeyframe,
resolveAnimationTarget,
} from "@/lib/animation";
import { Command } from "@/lib/commands/base-command";
import { updateElementInTracks } from "@/lib/timeline";
import type { AnimationPath, AnimationValue } from "@/lib/animation/types";
import type { TimelineElement, TimelineTrack } from "@/lib/timeline";
function sampleValueBeforeRemoval({
element,
propertyPath,
keyframeId,
}: {
element: TimelineElement;
propertyPath: AnimationPath;
keyframeId: string;
}): AnimationValue | null {
const channel = getChannel({
animations: element.animations,
propertyPath,
});
const keyframe = channel?.keyframes.find(
(candidate) => candidate.id === keyframeId,
);
if (!channel || !keyframe) {
return null;
}
const target = resolveAnimationTarget({ element, path: propertyPath });
if (!target) {
return null;
}
const baseValue = target.getBaseValue();
if (baseValue === null) {
return null;
}
return getChannelValueAtTime({
channel,
time: keyframe.time,
fallbackValue: baseValue,
});
}
function removeKeyframeAndPersist({
element,
propertyPath,
keyframeId,
}: {
element: TimelineElement;
propertyPath: AnimationPath;
keyframeId: string;
}): TimelineElement {
const target = resolveAnimationTarget({ element, path: propertyPath });
if (!target) {
return element;
}
const valueBefore = sampleValueBeforeRemoval({
element,
propertyPath,
keyframeId,
});
const nextAnimations = removeElementKeyframe({
animations: element.animations,
propertyPath,
keyframeId,
});
const isChannelNowEmpty =
getChannel({ animations: nextAnimations, propertyPath }) === undefined;
const shouldPersistToBase = isChannelNowEmpty && valueBefore !== null;
const baseElement = shouldPersistToBase
? target.setBaseValue(valueBefore)
: element;
return { ...baseElement, animations: nextAnimations };
}
export class RemoveKeyframeCommand extends Command {
private savedState: TimelineTrack[] | null = null;
private readonly trackId: string;
private readonly elementId: string;
private readonly propertyPath: AnimationPath;
private readonly keyframeId: string;
constructor({
trackId,
elementId,
propertyPath,
keyframeId,
}: {
trackId: string;
elementId: string;
propertyPath: AnimationPath;
keyframeId: string;
}) {
super();
this.trackId = trackId;
this.elementId = elementId;
this.propertyPath = propertyPath;
this.keyframeId = keyframeId;
}
execute(): void {
const editor = EditorCore.getInstance();
this.savedState = editor.timeline.getTracks();
const updatedTracks = updateElementInTracks({
tracks: this.savedState,
trackId: this.trackId,
elementId: this.elementId,
update: (element) =>
removeKeyframeAndPersist({
element,
propertyPath: this.propertyPath,
keyframeId: this.keyframeId,
}),
});
editor.timeline.updateTracks(updatedTracks);
}
undo(): void {
if (!this.savedState) {
return;
}
const editor = EditorCore.getInstance();
editor.timeline.updateTracks(this.savedState);
}
}
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