private Rect DrawLayoutEmptyList(DrawEmpty drawEmpty)
{
Rect r = EditorGUILayout.BeginVertical(containerStyle);
{
if (drawEmpty != null)
drawEmpty();
else
GUILayout.Space(5);
}
EditorGUILayout.EndVertical();
// Allow room for add button.
GUILayoutUtility.GetRect(0, addButtonStyle.fixedHeight - 1);
return r;
}