add cancel transaction

flutter/lib/models/saham_transaksi.dart

@@ -26,6 +26,7 @@ class Transaksi {
   final double harga;
   final double fee;
   final double total;
+  final String state; // done | cancel
 
   Transaksi({
     required this.id,
@@ -37,9 +38,11 @@ class Transaksi {
     required this.harga,
     required this.fee,
     required this.total,
+    this.state = 'done',
   });
 
   bool get isBuy => tipe == 'buy';
+  bool get isCancelled => state == 'cancel';
 
   factory Transaksi.fromOdoo(Map<String, dynamic> m) {
     String ticker = '';
@@ -58,6 +61,7 @@ class Transaksi {
       harga: (m['harga'] as num?)?.toDouble() ?? 0,
       fee: (m['fee'] as num?)?.toDouble() ?? 0,
       total: (m['total'] as num?)?.toDouble() ?? 0,
+      state: (m['state'] as String?) ?? 'done',
     );
   }
 }