public static DragAndDropVisualMode HandleClipPaneObjectDragAndDrop(IEnumerable <UnityObject> objectsBeingDropped, TrackAsset targetTrack, bool perform, TimelineAsset timeline, TrackAsset parent, PlayableDirector director, double candidateTime, TypeResolver typeResolver, TrackAsset insertBefore = null)
{
if (timeline == null)
{
return(DragAndDropVisualMode.Rejected);
}
// locked tracks always reject
if (targetTrack != null && targetTrack.lockedInHierarchy)
{
return(DragAndDropVisualMode.Rejected);
}
// treat group tracks as having no track
if (targetTrack is GroupTrack)
{
parent = targetTrack;
targetTrack = null;
}
// Special case for monoscripts, since they describe the type
if (objectsBeingDropped.Any(o => o is MonoScript))
{
return(HandleClipPaneMonoScriptDragAndDrop(objectsBeingDropped.OfType <MonoScript>(), targetTrack, perform, timeline, parent, director, candidateTime));
}
// no unity objects, or explicit exceptions
if (!objectsBeingDropped.Any() || objectsBeingDropped.Any(o => !ValidateObjectDrop(o)))
{
return(DragAndDropVisualMode.Rejected);
}
// reject scene references if we have no context
if (director == null && objectsBeingDropped.Any(o => o.IsSceneObject()))
{
return(DragAndDropVisualMode.Rejected);
}
var validTrackTypes = objectsBeingDropped.SelectMany(o => TypeUtility.GetTrackTypesForObject(o)).Distinct().ToList();
// special case for playable assets
if (objectsBeingDropped.Any(o => TypeUtility.IsConcretePlayableAsset(o.GetType())))
{
var playableAssets = objectsBeingDropped.OfType <IPlayableAsset>().Where(o => TypeUtility.IsConcretePlayableAsset(o.GetType()));
return(HandleClipPanePlayableAssetDragAndDrop(playableAssets, targetTrack, perform, timeline, parent, director, candidateTime, typeResolver));
}
var markerTypes = objectsBeingDropped.SelectMany(o => TypeUtility.MarkerTypesWithFieldForObject(o)).Distinct();
// No tracks or markers support this object
if (!(markerTypes.Any() || validTrackTypes.Any()))
{
return(DragAndDropVisualMode.Rejected);
}
// track is not compatible with marker
if (targetTrack != null && markerTypes.Any(o => !TypeUtility.DoesTrackSupportMarkerType(targetTrack, o)))
{
// track is not compatible with object
if (!validTrackTypes.Contains(targetTrack.GetType()))
{
return(DragAndDropVisualMode.Rejected);
}
}
// there is no target track, dropping to empty space, or onto a group
if (perform)
{
// choose track and then clip
if (targetTrack == null)
{
var createdTrack = HandleTrackAndItemCreation(objectsBeingDropped, candidateTime, typeResolver, timeline, parent, validTrackTypes, insertBefore);
if (!createdTrack)
{
timeline.CreateMarkerTrack();
HandleItemCreation(objectsBeingDropped, timeline.markerTrack, candidateTime, typeResolver, true); // menu is always popped if ambiguous choice
}
}
// just choose clip/marker
else
{
HandleItemCreation(objectsBeingDropped, targetTrack, candidateTime, typeResolver, true); // menu is always popped if ambiguous choice
}
}
return(DragAndDropVisualMode.Copy);
}
