public static List <int> GetNewSelection(int clickedInstanceID, List <int> allInstanceIDs, List <int> selectedInstanceIDs, int lastClickedInstanceID, bool keepMultiSelection, bool useShiftAsActionKey, bool allowMultiSelection)
{
List <int> list = new List <int>();
bool flag = Event.current.shift || (EditorGUI.actionKey && useShiftAsActionKey);
bool flag2 = EditorGUI.actionKey && !useShiftAsActionKey;
if (!allowMultiSelection)
{
flag2 = (flag = false);
}
if (flag2)
{
list.AddRange(selectedInstanceIDs);
if (list.Contains(clickedInstanceID))
{
list.Remove(clickedInstanceID);
}
else
{
list.Add(clickedInstanceID);
}
}
else
{
if (flag)
{
if (clickedInstanceID == lastClickedInstanceID)
{
return(selectedInstanceIDs);
}
int num;
int num2;
if (!InternalEditorUtility.GetFirstAndLastSelected(allInstanceIDs, selectedInstanceIDs, out num, out num2))
{
list.Add(clickedInstanceID);
return(list);
}
int num3 = -1;
int num4 = -1;
for (int i = 0; i < allInstanceIDs.Count; i++)
{
if (allInstanceIDs[i] == clickedInstanceID)
{
num3 = i;
}
if (lastClickedInstanceID != 0 && allInstanceIDs[i] == lastClickedInstanceID)
{
num4 = i;
}
}
int num5 = 0;
if (num4 != -1)
{
num5 = ((num3 <= num4) ? -1 : 1);
}
int num6;
int num7;
if (num3 > num2)
{
num6 = num;
num7 = num3;
}
else
{
if (num3 >= num && num3 < num2)
{
if (num5 > 0)
{
num6 = num3;
num7 = num2;
}
else
{
num6 = num;
num7 = num3;
}
}
else
{
num6 = num3;
num7 = num2;
}
}
for (int j = num6; j <= num7; j++)
{
list.Add(allInstanceIDs[j]);
}
}
else
{
if (keepMultiSelection && selectedInstanceIDs.Contains(clickedInstanceID))
{
list.AddRange(selectedInstanceIDs);
return(list);
}
list.Add(clickedInstanceID);
}
}
return(list);
}
