public virtual void OnBuildTrackContextMenu(GenericMenu menu, TrackAsset trackAsset, ITimelineState state) { bool flag = trackAsset is AnimationTrack || trackAsset is AudioTrack; if (flag) { List <Type> list = TimelineHelpers.GetTypesHandledByTrackType(TimelineHelpers.TrackTypeFromType(trackAsset.GetType())).ToList <Type>(); for (int i = 0; i < list.Count; i++) { Type assetType = list[i]; this.AddAddAssetMenuItem(menu, assetType, trackAsset, state); } } else if (TimelineHelpers.GetMediaTypeFromType(trackAsset.GetType()) == TimelineAsset.MediaType.Script) { Type customPlayableType = trackAsset.GetCustomPlayableType(); if (customPlayableType != null) { string displayName = TrackDrawer.GetDisplayName(customPlayableType); GUIContent gUIContent = new GUIContent("Add " + displayName + " Clip"); menu.AddItem(new GUIContent(gUIContent), false, delegate(object userData) { TimelineHelpers.CreateClipOnTrack(userData as Type, trackAsset, state); }, customPlayableType); } } ITimelineMarkerContainer markerContainer = trackAsset as ITimelineMarkerContainer; if (markerContainer != null) { menu.AddItem(TrackDrawer.Styles.newMarker, false, delegate { this.CreateNewMarker(markerContainer, state); }); IEnumerable <string> enumerable = (from x in markerContainer.GetMarkers() select x.key).Distinct <string>(); if (enumerable.Any <string>()) { using (IEnumerator <string> enumerator = enumerable.GetEnumerator()) { while (enumerator.MoveNext()) { string key = enumerator.Current; menu.AddItem(new GUIContent(TrackDrawer.Styles.addMarker.get_text() + key), false, delegate { this.CreateExistingMarker(key, markerContainer, state); }); } } } } }