import { AnnouncementMessages , getDefaultAnnouncementMessages } from "./util/AnnouncementMessages" ; interface AnnouncerOptions { getAnnouncementMessages ? : ( ) => AnnouncementMessages ; announcerClassName ? : string ; } export default class DragAnnouncer { private target : HTMLElement | undefined ; private getMessages : ( ) => AnnouncementMessages ; public constructor ( private document , { getAnnouncementMessages , announcerClassName } = { } ) { this . getMessages = getAnnouncementMessages ?? getDefaultAnnouncementMessages ; this . target = this . document ?. createElement ( "span" ) ; if ( this . target != null ) { this . target . setAttribute ( "aria-live" , "assertive" ) ; this . target . setAttribute ( "aria-atomic" , "true" ) ; if ( announcerClassName ) { this . target . className = announcerClassName ; } else { this . target . className = "drag-announcer" ; this . target . style . cssText = "position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); border: 0;" ; } } } attach ( ) { if ( this . target == null ) return ; this . document ?. body . appendChild ( this . target ) ; } detach ( ) { const body = this . document ?. body ; if ( this . target == null || body == null ) return ; if ( body . contains ( this . target ) ) { body . removeChild ( this . target ) ; } } announce ( message ) { if ( this . target == null ) return ; this . target . innerText = message ; } announceDrag ( node , id ) { if ( node == null ) return ; this . announce ( this . getMessages ( ) . pickedUpItem ( id , node ) ) ; } announceHover ( node , id ) { if ( node == null ) return ; this . announce ( this . getMessages ( ) . hoveredTarget ( id , node ) ) ; } announceDrop ( node , id ) { this . announce ( this . getMessages ( ) . droppedItem ( id , node ) ) ; } announceCancel ( node , id ) { this . announce ( this . getMessages ( ) . canceledDrag ( id , node ) ) ; } clear ( ) { this . announce ( "" ) ; } }