親の Canvas の状態が変更されたとき呼び出されます。
親の Canvas が有効、無効、ネストされた Canvas の OverrideSorting が変更されたときに、この関数が呼び出されます。例えば、オブジェクトを修正するために、この関数を使用することができます。下記は、親の Canvas に依存するべき Canvas です。例：Canvas を無効にした場合、UI 要素の処理を一部停止したいこともあります。
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