cw-1584-ironwood-migration-modal (#3481)

* ironwood migration modal

* auto-show when migration begins

* remove restricted import

* new condition

* string fix

* only activate if ironwood is active

* reaction safeguards

* migration*

lib/view_model/dashboard/dashboard_view_model.dart

@@ -96,6 +96,7 @@ abstract class DashboardViewModelBase with Store {
         isShowFirstYatIntroduction = false,
         isShowSecondYatIntroduction = false,
         isShowThirdYatIntroduction = false,
+        isMigratingToIronwood = false,
         filterItems = [],
         exchangeFilterItems = [],
         subname = '',
@@ -250,6 +251,8 @@ abstract class DashboardViewModelBase with Store {
 
     reaction((_) => tradesStore.trades, (_) => tradeMonitor.monitorActiveTrades(wallet.id));
 
+    addZcashMigrationReaction();
+
     tradeMonitor.monitorActiveTrades(wallet.id);
   }
 
@@ -374,6 +377,22 @@ abstract class DashboardViewModelBase with Store {
     );
   }
 
+  @observable
+  ReactionDisposer? zcashMigrationReactionDisposer;
+
+  @action
+  void addZcashMigrationReaction()  {
+    zcashMigrationReactionDisposer?.reaction.dispose();
+    zcashMigrationReactionDisposer = null;
+
+    if (wallet.type == WalletType.zcash) {
+      zcashMigrationReactionDisposer = reaction((_) => wallet.balance.values.first, (_) async {
+        isMigratingToIronwood =
+            wallet.type == WalletType.zcash && await zcash!.hasOrchardMigratableBalance(wallet);
+      });
+    }
+  }
+
   @computed
   bool get isSyncHeavy {
     if ([
@@ -1270,6 +1289,8 @@ abstract class DashboardViewModelBase with Store {
     name = wallet.name;
     loadFilterItems();
 
+    addZcashMigrationReaction();
+
     if (wallet.type == WalletType.monero) {
       subname = monero!.getCurrentAccount(wallet).label;
 
@@ -1551,6 +1572,9 @@ abstract class DashboardViewModelBase with Store {
     }
   }
 
+  @observable
+  bool isMigratingToIronwood;
+
   String getTransactionType(TransactionInfo tx) {
     if (wallet.type == WalletType.bitcoin) {
       if (tx.isReplaced == true) return ' (replaced)';