Let the GUI compute the balance displayed in history.

Since Qt groups swap transactions, the displayed balance
was sometimes incorrect.

electrum/gui/qml/qetransactionlistmodel.py

@@ -20,7 +20,7 @@ class QETransactionListModel(QAbstractListModel, QtEventListener):
 
     # define listmodel rolemap
     _ROLE_NAMES=('txid','fee_sat','height','confirmations','timestamp','monotonic_timestamp',
-                 'incoming','value','balance','date','label','txpos_in_block','fee',
+                 'incoming','value','date','label','txpos_in_block','fee',
                  'inputs','outputs','section','type','lightning','payment_hash','key','complete')
     _ROLE_KEYS = range(Qt.UserRole, Qt.UserRole + len(_ROLE_NAMES))
     _ROLE_MAP  = dict(zip(_ROLE_KEYS, [bytearray(x.encode()) for x in _ROLE_NAMES]))
@@ -127,13 +127,11 @@ class QETransactionListModel(QAbstractListModel, QtEventListener):
 
         if item['lightning']:
             item['value'] = QEAmount(amount_sat=item['value'].value, amount_msat=item['amount_msat'])
-            item['balance'] = QEAmount(amount_sat=item['balance'].value, amount_msat=item['amount_msat'])
             if item['type'] == 'payment':
                 item['incoming'] = True if item['direction'] == 'received' else False
             item['confirmations'] = 0
         else:
             item['value'] = QEAmount(amount_sat=item['value'].value)
-            item['balance'] = QEAmount(amount_sat=item['balance'].value)
 
         if 'txid' in item:
             tx = self.wallet.db.get_transaction(item['txid'])

electrum/gui/qt/history_list.py

@@ -206,8 +206,8 @@ class HistoryNode(CustomNode):
             v_str = window.format_amount(value, is_diff=True, whitespaces=whitespaces, add_thousands_sep=add_thousands_sep)
             return QVariant(v_str)
         elif col == HistoryColumns.BALANCE:
-            balance = tx_item['balance'].value
+            balance = tx_item['balance'].value if 'balance' in tx_item else None
-            balance_str = window.format_amount(balance, whitespaces=whitespaces, add_thousands_sep=add_thousands_sep)
+            balance_str = window.format_amount(balance, whitespaces=whitespaces, add_thousands_sep=add_thousands_sep) if balance is not None else ''
             return QVariant(balance_str)
         elif col == HistoryColumns.FIAT_VALUE and 'fiat_value' in tx_item:
             value_str = window.fx.format_fiat(tx_item['fiat_value'].value, add_thousands_sep=add_thousands_sep)
@@ -322,7 +322,6 @@ class HistoryModel(CustomModel, Logger):
                     # add child to parent
                     parent.addChild(node)
                     # update parent data
-                    parent._data['balance'] = tx_item['balance']
                     parent._data['value'] += tx_item['value']
                     if 'group_label' in tx_item:
                         parent._data['label'] = tx_item['group_label']
@@ -339,6 +338,12 @@ class HistoryModel(CustomModel, Logger):
                         parent._data['height'] = tx_item['height']
                         parent._data['confirmations'] = tx_item['confirmations']
 
+        # compute balance once all children have beed added
+        balance = 0
+        for node in self._root._children:
+            balance += node._data['value'].value
+            node._data['balance'] = Satoshis(balance
+
         new_length = self._root.childCount()
         self.beginInsertRows(QModelIndex(), 0, new_length-1)
         self.transactions = transactions

electrum/gui/stdio.py

@@ -115,8 +115,10 @@ class ElectrumGui(BaseElectrumGui, EventListener):
                 time_str = 'unconfirmed'
 
             label = self.wallet.get_label_for_txid(hist_item.txid)
-            messages.append(format_str % (time_str, label, format_satoshis(delta, whitespaces=True),
+            messages.append(format_str % (
-                                          format_satoshis(hist_item.balance, whitespaces=True)))
+                time_str, label,
+                format_satoshis(hist_item.delta, whitespaces=True),
+                format_satoshis(hist_item.balance, whitespaces=True)))
 
         self.print_list(messages[::-1], format_str%(_("Date"), _("Description"), _("Amount"), _("Balance")))
 

electrum/gui/text.py

@@ -164,9 +164,10 @@ class ElectrumGui(BaseElectrumGui, EventListener):
         domain = self.wallet.get_addresses()
         self.history = []
         self.txid = []
+        balance_sat = 0
         for item in self.wallet.get_full_history().values():
             amount_sat = item['value'].value
-            balance_sat = item['balance'].value
+            balance_sat += amount_sat
             if item.get('lightning'):
                 timestamp = item['timestamp']
                 label = self.wallet.get_label_for_rhash(item['payment_hash'])

electrum/wallet.py

@@ -1280,7 +1280,6 @@ class Abstract_Wallet(ABC, Logger, EventListener):
         for k, v in sorted(list(transactions_tmp.items()), key=sort_key):
             transactions[k] = v
         now = time.time()
-        balance = 0
         for item in transactions.values():
             # add on-chain and lightning values
             value = Decimal(0)
@@ -1288,10 +1287,8 @@ class Abstract_Wallet(ABC, Logger, EventListener):
                 value += item['bc_value'].value
             if item.get('ln_value'):
                 value += item.get('ln_value').value
-            # note: 'value' and 'balance' has msat precision (as LN has msat precision)
+            # note: 'value' has msat precision (as LN has msat precision)
             item['value'] = Satoshis(value)
-            balance += value
-            item['balance'] = Satoshis(balance)
             if include_fiat:
                 txid = item.get('txid')
                 if not item.get('lightning') and txid: