패널은 시각적 트리의 부모 오브젝트입니다.rootVisualElement
를 소유하지만 그 자체는 시각적 요소가 아닙니다.시각적 트리는 트리 안의 시각적 요소가 렌더링되도록 패널에 연결해야 합니다.모든 패널은 에디터 창 또는 런타임 UIDocument에 속합니다.패널은 시각적 트리에 대한 포커스 컨트롤 및 이벤트 디스패칭도 처리합니다.
시각적 트리의 모든 요소는 시각적 트리가 있는 패널에 대한 직접 레퍼런스를 보유합니다.패널과 VisualElement
의 연결을 확인하기 위해 이 요소의 panel
프로퍼티를 테스트할 수 있습니다.시각적 요소가 연결되어 있지 않은 경우 테스트는 null
을 반환합니다.
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