public override void Execute()
{
// Queue objects sent to back
Dictionary <int, ObjectInstance> backMap = new Dictionary <int, ObjectInstance>();
foreach (ObjectInstance inst in _toBack)
{
backMap.Add(_objectSource.ObjectIndex(inst), inst);
}
List <int> backKeys = new List <int>(backMap.Keys);
backKeys.Sort();
foreach (ObjectRecord record in _objects)
{
record.NewIndex += backKeys.Count;
}
for (int i = 0; i < backKeys.Count; i++)
{
_objects.Add(new ObjectRecord()
{
Instance = backMap[backKeys[i]],
PrevIndex = backKeys[i],
NewIndex = i,
});
}
// Sort objects moved relatively
_objects.Sort((u, v) => {
return(u.PrevIndex.CompareTo(v.PrevIndex));
});
// Queue objects sent to front
Dictionary <int, ObjectInstance> frontMap = new Dictionary <int, ObjectInstance>();
foreach (ObjectInstance inst in _toFront)
{
frontMap.Add(_objectSource.ObjectIndex(inst), inst);
}
List <int> frontKeys = new List <int>(frontMap.Keys);
frontKeys.Sort();
for (int i = 0; i < frontKeys.Count; i++)
{
_objects.Add(new ObjectRecord()
{
Instance = frontMap[frontKeys[i]],
PrevIndex = frontKeys[i],
NewIndex = _objectSource.ObjectCount - 1,
});
}
// Execute command
foreach (ObjectRecord record in _objects)
{
_objectSource.MoveToIndex(record.Instance, record.NewIndex);
}
}