private void DrawEngineSelector <T>(string engineName, ref string engineId, ref T[] instances, ref string[] names, ref int index) where T : IEngine
{
if (instances == null)
{
// get all instances
instances = EngineProvider <T> .GetAll().ToArray();
names = instances.Select(x => x.Name).ToArray();
// set the current index based on the table's ID
index = -1;
for (var i = 0; i < instances.Length; i++)
{
if (EngineProvider <T> .GetId(instances[i]) == engineId)
{
index = i;
break;
}
}
if (instances.Length > 0 && index < 0)
{
index = 0;
engineId = EngineProvider <T> .GetId(instances[index]);
}
}
if (names.Length == 0)
{
return;
}
var newIndex = EditorGUILayout.Popup(engineName, index, names);
if (index != newIndex)
{
index = newIndex;
engineId = EngineProvider <T> .GetId(instances[newIndex]);
}
}
