aibis-dream/Assets/Scripts/FrameAnimation/Timeline/Editor/FrameAnimationTimelineClipEditor.cs

using UnityEditor.Timeline;
using UnityEngine.Timeline;

namespace AibisDream.FrameAnimation.Timeline.Editor
{
    [CustomTimelineEditor(typeof(FrameAnimationTimelineClip))]
    internal sealed class FrameAnimationTimelineClipEditor : ClipEditor
    {
        public override void OnCreate(TimelineClip clip, TrackAsset track, TimelineClip clonedFrom)
        {
            base.OnCreate(clip, track, clonedFrom);
            SynchronizeSource(clip);
        }

        public override void OnClipChanged(TimelineClip clip)
        {
            base.OnClipChanged(clip);
            SynchronizeSource(clip);
        }

        public override ClipDrawOptions GetClipOptions(TimelineClip clip)
        {
            var options = base.GetClipOptions(clip);
            if (clip?.asset is not FrameAnimationTimelineClip asset)
            {
                return options;
            }

            if (asset.FrameClip == null)
            {
                options.errorText = "未指定 FrameClip";
            }
            return options;
        }

        private static void SynchronizeSource(TimelineClip clip)
        {
            if (clip?.asset is not FrameAnimationTimelineClip asset ||
                !asset.TrySynchronizeSourceDuration(out var duration))
            {
                return;
            }

            clip.duration = duration;
            clip.displayName = asset.FrameClip != null &&
                               !string.IsNullOrEmpty(asset.FrameClip.DisplayName)
                ? asset.FrameClip.DisplayName
                : "Frame Animation Clip";
        }
    }
}