CAKE-172 | added onHeightOrDateEntered function to blockchain_height_widget and called it in the restoreHeightController listener; added string resources to blockchain_height_widget; added isButtonEnabled parameter to rescan view model and wallet restore view model; added reaction on mode in the wallet restore page; applied isDisable to buttons in wallet restore page and rescan page

lib/src/screens/rescan/rescan_page.dart

@@ -21,23 +21,9 @@ class RescanPage extends BasePage {
       padding: EdgeInsets.only(left: 24, right: 24, bottom: 24),
       child:
           Column(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
-        Column(
-          children: <Widget>[
-            BlockchainHeightWidget(key: _blockchainHeightWidgetKey),
-            Padding(
-              padding: EdgeInsets.only(left: 40, right: 40, top: 24),
-              child: Text(
-                S.of(context).restore_from_date_or_blockheight,
-                textAlign: TextAlign.center,
-                style: TextStyle(
-                    fontSize: 12,
-                    fontWeight: FontWeight.normal,
-                    color: Theme.of(context).hintColor
-                ),
-              ),
-            )
-          ],
-        ),
+              BlockchainHeightWidget(key: _blockchainHeightWidgetKey,
+                  onHeightOrDateEntered: (value) =>
+                  _rescanViewModel.isButtonEnabled = value),
         Observer(
             builder: (_) => LoadingPrimaryButton(
                   isLoading:
@@ -51,6 +37,7 @@ class RescanPage extends BasePage {
                   },
                   color: Theme.of(context).accentTextTheme.body2.color,
                   textColor: Colors.white,
+                  isDisabled: !_rescanViewModel.isButtonEnabled,
                 ))
       ]),
     );

lib/src/screens/restore/wallet_restore_from_keys_form.dart

@@ -6,7 +6,10 @@ import 'package:cake_wallet/src/widgets/blockchain_height_widget.dart';
 import 'package:cake_wallet/src/widgets/base_text_form_field.dart';
 
 class WalletRestoreFromKeysFrom extends StatefulWidget {
-  WalletRestoreFromKeysFrom({Key key}) : super(key: key);
+  WalletRestoreFromKeysFrom({Key key, this.onHeightOrDateEntered})
+      : super(key: key);
+
+  final Function (bool) onHeightOrDateEntered;
 
   @override
   WalletRestoreFromKeysFromState createState() =>
@@ -63,7 +66,9 @@ class WalletRestoreFromKeysFromState extends State<WalletRestoreFromKeysFrom> {
                     hintText: S.of(context).restore_spend_key_private,
                     maxLines: null)),
             BlockchainHeightWidget(
-                key: blockchainHeightKey, onHeightChange: (_) => null)
+                key: blockchainHeightKey,
+                onHeightChange: (_) => null,
+                onHeightOrDateEntered: widget.onHeightOrDateEntered)
           ]),
         ));
   }

lib/src/screens/restore/wallet_restore_from_seed_form.dart

@@ -7,10 +7,12 @@ import 'package:cake_wallet/src/widgets/base_text_form_field.dart';
 import 'package:cake_wallet/src/widgets/blockchain_height_widget.dart';
 
 class WalletRestoreFromSeedForm extends StatefulWidget {
-  WalletRestoreFromSeedForm({Key key, this.blockHeightFocusNode})
+  WalletRestoreFromSeedForm({Key key, this.blockHeightFocusNode,
+    this.onHeightOrDateEntered})
       : super(key: key);
 
   final FocusNode blockHeightFocusNode;
+  final Function (bool) onHeightOrDateEntered;
 
   @override
   WalletRestoreFromSeedFormState createState() =>
@@ -63,7 +65,8 @@ class WalletRestoreFromSeedFormState extends State<WalletRestoreFromSeedForm> {
                           readOnly: true)))),
           BlockchainHeightWidget(
               focusNode: widget.blockHeightFocusNode,
-              key: blockchainHeightKey)
+              key: blockchainHeightKey,
+              onHeightOrDateEntered: widget.onHeightOrDateEntered)
         ]));
   }
 

lib/src/screens/restore/wallet_restore_page.dart

@@ -28,8 +28,12 @@ class WalletRestorePage extends BasePage {
     _pages.addAll([
       WalletRestoreFromSeedForm(
           key: walletRestoreFromSeedFormKey,
-          blockHeightFocusNode: _blockHeightFocusNode),
-      WalletRestoreFromKeysFrom(key: walletRestoreFromKeysFormKey)
+          blockHeightFocusNode: _blockHeightFocusNode,
+          onHeightOrDateEntered: (value)
+          => walletRestoreViewModel.isButtonEnabled = value),
+      WalletRestoreFromKeysFrom(key: walletRestoreFromKeysFormKey,
+          onHeightOrDateEntered: (value)
+          => walletRestoreViewModel.isButtonEnabled = value)
     ]);
   }
 
@@ -72,6 +76,21 @@ class WalletRestorePage extends BasePage {
       }
     });
 
+    reaction((_) => walletRestoreViewModel.mode, (WalletRestoreMode mode)
+      {
+        walletRestoreViewModel.isButtonEnabled = false;
+
+        walletRestoreFromSeedFormKey.currentState.blockchainHeightKey
+            .currentState.restoreHeightController.text = '';
+        walletRestoreFromSeedFormKey.currentState.blockchainHeightKey
+            .currentState.dateController.text = '';
+
+        walletRestoreFromKeysFormKey.currentState.blockchainHeightKey
+            .currentState.restoreHeightController.text = '';
+        walletRestoreFromKeysFormKey.currentState.blockchainHeightKey
+            .currentState.dateController.text = '';
+      });
+
     return Column(mainAxisAlignment: MainAxisAlignment.center, children: [
       Expanded(
           child: PageView.builder(
@@ -113,7 +132,8 @@ class WalletRestorePage extends BasePage {
                       .accentTextTheme
                       .headline
                       .decorationColor,
-                  isLoading: walletRestoreViewModel.state is IsExecutingState);
+                  isLoading: walletRestoreViewModel.state is IsExecutingState,
+                  isDisabled: !walletRestoreViewModel.isButtonEnabled,);
             },
           ))
     ]);

lib/src/widgets/blockchain_height_widget.dart

@@ -6,10 +6,12 @@ import 'package:cake_wallet/monero/get_height_by_date.dart';
 import 'package:cake_wallet/src/widgets/base_text_form_field.dart';
 
 class BlockchainHeightWidget extends StatefulWidget {
-  BlockchainHeightWidget({GlobalKey key, this.onHeightChange, this.focusNode})
+  BlockchainHeightWidget({GlobalKey key, this.onHeightChange, this.focusNode,
+    this.onHeightOrDateEntered})
       : super(key: key);
 
   final Function(int) onHeightChange;
+  final Function(bool) onHeightOrDateEntered;
   final FocusNode focusNode;
 
   @override
@@ -26,6 +28,13 @@ class BlockchainHeightState extends State<BlockchainHeightWidget> {
   @override
   void initState() {
     restoreHeightController.addListener(() {
+      if (restoreHeightController.text.isNotEmpty) {
+        widget.onHeightOrDateEntered?.call(true);
+      }
+      else {
+        widget.onHeightOrDateEntered?.call(false);
+        dateController.text = '';
+      }
       try {
         _changeHeight(restoreHeightController.text != null &&
                 restoreHeightController.text.isNotEmpty
@@ -83,6 +92,18 @@ class BlockchainHeightState extends State<BlockchainHeightWidget> {
             ))
           ],
         ),
+        Padding(
+          padding: EdgeInsets.only(left: 40, right: 40, top: 24),
+          child: Text(
+            S.of(context).restore_from_date_or_blockheight,
+            textAlign: TextAlign.center,
+            style: TextStyle(
+                fontSize: 12,
+                fontWeight: FontWeight.normal,
+                color: Theme.of(context).hintColor
+            ),
+          ),
+        )
       ],
     );
   }

lib/view_model/rescan_view_model.dart

@@ -10,12 +10,16 @@ enum RescanWalletState { rescaning, none }
 abstract class RescanViewModelBase with Store {
   RescanViewModelBase(this._wallet) {
     state = RescanWalletState.none;
+    isButtonEnabled = false;
   }
 
   @observable
   RescanWalletState state;
   final WalletBase _wallet;
 
+  @observable
+  bool isButtonEnabled;
+
   @action
   Future<void> rescanCurrentWallet({int restoreHeight}) async {
     state = RescanWalletState.rescaning;

lib/view_model/wallet_restore_view_model.dart

@@ -23,6 +23,7 @@ abstract class WalletRestoreViewModelBase extends WalletCreationVM with Store {
       Box<WalletInfo> walletInfoSource,
       {@required WalletType type})
       : super(appStore, walletInfoSource, type: type, isRecovery: true) {
+    isButtonEnabled = false;
     mode = WalletRestoreMode.seed;
     _walletCreationService.changeWalletType(type: WalletType.monero);
   }
@@ -30,6 +31,9 @@ abstract class WalletRestoreViewModelBase extends WalletCreationVM with Store {
   @observable
   WalletRestoreMode mode;
 
+  @observable
+  bool isButtonEnabled;
+
   final WalletCreationService _walletCreationService;
 
   @override