void OnDestroy()
{
Layout cur_layout = m_layout_mng.CurEditLayout;
if (cur_layout != null && cur_layout.Dirty)
{
if (EditorUtility.DisplayDialog("", "当前编辑的layout已被修改，是否保存?", "是", "否"))
{
cur_layout.Save();
}
}
ClearUndos();
m_view.Dispose();
m_layout_mng.Dispose();
LayoutTool.ReleaseRoot();
}