public void Run()
{
MouseInput();
if (UndoEvt.IsEmpty() && RedoEvt.IsEmpty())
{
return;
}
Counters(undo: !UndoEvt.IsEmpty(), redo: !RedoEvt.IsEmpty(), false);
_preventHistoryInsert = true;
if (!_preventSelectionSet)
{
(var history, var id) = Globals <PersistentUndoRedoState> .Value;
SelectionEntry entry = history[id];
if (entry.Valid())
{
Selection.objects = entry.IsGuids
? entry.Guids.Select(AssetDatabase.GUIDToAssetPath).Select(AssetDatabase.LoadAssetAtPath <Object>).Where(obj => obj).ToArray()
: entry.SceneObjects;
}
}
_preventSelectionSet = false;
UndoEvt.AllDestroy();
RedoEvt.AllDestroy();
}
static void Counters(bool undo, bool redo, bool insertToHistory)
{
var state = Globals <PersistentUndoRedoState> .Value;
World.NewEntityWith(out RequestRepaintEvt _);
const int MinId = 0;
if (insertToHistory)
{
var entry = new SelectionEntry();
var count = state.History.Count - 1 - state.Id;
if (count > 0)
{
state.History.RemoveRange(state.Id + 1, count);
}
state.History.Add(entry);
state.Id = MaxId();
if (Selection.assetGUIDs.Length > 0)
{
entry.IsGuids = true;
entry.Guids = Selection.assetGUIDs;
}
else
{
entry.SceneObjects = Selection.objects;
}
}
if (undo)
{
// loop to skip invalid
while (true)
{
state.Id -= 1;
if (state.Id < MinId)
{
break;
}
if (state.History[state.Id].Valid())
{
break;
}
}
}
if (redo)
{
// loop to skip invalid
while (true)
{
state.Id += 1;
if (state.Id > MaxId())
{
break;
}
if (state.History[state.Id].Valid())
{
break;
}
}
}
state.Id = Mathf.Clamp(state.Id, MinId, MaxId());
var undoRedoState = Globals <UndoRedoState> .Value;
undoRedoState.UndoEnabled = state.Id != MinId;
undoRedoState.RedoEnabled = state.Id != MaxId();
int MaxId() => Mathf.Max(0, state.History.Count - 1);
}