activeUid property

String? activeUid

显示逻辑，有焦点显示焦点， 否则显示活跃， 否则显示host，否则显示自己, speakingUid与activeUid相同，当没有人说话时，activeUid不变，speakingUid置空

Implementation

String? focusUid, activeUid, bigUid, smallUid, speakingUid;