USS 子孫セレクターは、ビジュアルツリー 内の別の要素の子孫である要素を検出します。
子孫セレクターは、スペースで区切られた複数の単純なセレクターで構成されます。
selector1 selector2 {...}
単純なセレクターがどのように要素を検出するかを示すために、UI ドキュメントの例を示します。
<UXML xmlns="UnityEngine.UIElements">
<VisualElement name="container1">
<VisualElement name="container2" class="yellow">
<Button name="OK" class="yellow" text="OK" />
<Button name="Cancel" text="Cancel" />
</VisualElement>
</VisualElement>
</UXML>
スタイルをまったく適用しない場合、UI は以下のようになります。
以下の子孫セレクターのスタイルルールは、内部要素と最初のボタンの両方を検出します。
# container1 .yellow {
background-color: yellow;
}
スタイルを適用すると、UI は以下のようになります。
ノート: 子孫セレクターを多用すると、パフォーマンスに悪影響を及ぼす可能性があります。パフォーマンスのガイドラインについては、USS のベストプラクティス を参照してください。
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