Dismissible

Dismissible( key: Key(item.id), // 반드시 고유값 child: ListTile( title: Text(item.title), ), )

child: ListTile(title: Text("할 일"))

background: Container( color: Colors.red, alignment: Alignment.centerLeft, padding: EdgeInsets.only(left: 20), child: Icon(Icons.delete, color: Colors.white), ), secondaryBackground: Container( color: Colors.blue, alignment: Alignment.centerRight, padding: EdgeInsets.only(right: 20), child: Icon(Icons.archive, color: Colors.white), ),

direction: DismissDirection.horizontal

confirmDismiss: (direction) async { return await showDialog( context: context, builder: (context) => AlertDialog( title: Text("삭제하시겠습니까?"), actions: [ TextButton( onPressed: () => Navigator.pop(context, false), child: Text("취소"), ), TextButton( onPressed: () => Navigator.pop(context, true), child: Text("삭제"), ), ], ), ); },

onDismissed: (direction) { setState(() { items.removeAt(index); }); ScaffoldMessenger.of(context).showSnackBar( SnackBar(content: Text("삭제되었습니다")), ); },

ListView.builder( itemCount: items.length, itemBuilder: (context, index) { final item = items[index]; return Dismissible( key: Key(item.id), background: Container( color: Colors.red, alignment: Alignment.centerLeft, padding: EdgeInsets.only(left: 20), child: Icon(Icons.delete, color: Colors.white), ), secondaryBackground: Container( color: Colors.green, alignment: Alignment.centerRight, padding: EdgeInsets.only(right: 20), child: Icon(Icons.check, color: Colors.white), ), confirmDismiss: (direction) async { return await showDialog( context: context, builder: (context) => AlertDialog( title: Text("정말 삭제하시겠습니까?"), actions: [ TextButton( onPressed: () => Navigator.pop(context, false), child: Text("취소"), ), TextButton( onPressed: () => Navigator.pop(context, true), child: Text("삭제"), ), ], ), ); }, onDismissed: (direction) { setState(() { items.removeAt(index); }); ScaffoldMessenger.of(context).showSnackBar( SnackBar(content: Text("${item.title} 삭제됨")), ); }, child: ListTile( title: Text(item.title), ), ); }, );

key: Key(item.id)

onDismissed: (direction) { if (direction == DismissDirection.startToEnd) { // 완료 처리 } else { // 삭제 처리 } }