common_qt: move QtEventListener and qt_event_listener decorator to common_qt

diff --git a/electrum/gui/common_qt/util.py b/electrum/gui/common_qt/util.py
index 7eed35a..b28e0c6 100644
--- a/electrum/gui/common_qt/util.py
+++ b/electrum/gui/common_qt/util.py
@@ -1,5 +1,6 @@
 import queue
 import sys
+from functools import wraps
 from typing import Optional, NamedTuple, Callable
 import os.path
 
@@ -10,6 +11,7 @@ import qrcode
 
 from electrum.i18n import _
 from electrum.logging import Logger
+from electrum.util import EventListener, event_listener
 
 _cached_font_ids: dict[str, int] = {}
 
@@ -190,3 +192,33 @@ class TaskThread(QThread, Logger):
         self.tasks.put(None)  # in case the thread is still waiting on the queue
         self.exit()
         self.wait()
+
+
+class QtEventListener(EventListener):
+    qt_callback_signal = pyqtSignal(tuple)
+
+    def register_callbacks(self):
+        self.qt_callback_signal.connect(self.on_qt_callback_signal)
+        EventListener.register_callbacks(self)
+
+    def unregister_callbacks(self):
+        try:
+            self.qt_callback_signal.disconnect()
+        except (RuntimeError, TypeError):  # wrapped Qt object might be deleted
+            # "TypeError: disconnect() failed between 'qt_callback_signal' and all its connections"
+            pass
+        EventListener.unregister_callbacks(self)
+
+    def on_qt_callback_signal(self, args):
+        func = args[0]
+        return func(self, *args[1:])
+
+
+# decorator for members of the QtEventListener class
+def qt_event_listener(func):
+    func = event_listener(func)
+
+    @wraps(func)
+    def decorator(self, *args):
+        self.qt_callback_signal.emit((func,) + args)
+    return decorator
diff --git a/electrum/gui/qml/qeaddresslistmodel.py b/electrum/gui/qml/qeaddresslistmodel.py
index 2b4dbf4..fa7a546 100644
--- a/electrum/gui/qml/qeaddresslistmodel.py
+++ b/electrum/gui/qml/qeaddresslistmodel.py
@@ -5,10 +5,12 @@ from PyQt6.QtCore import Qt, QAbstractListModel, QModelIndex
 
 from electrum.logging import get_logger
 from electrum.util import Satoshis
-from .qeconfig import QEConfig
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+
+from .qeconfig import QEConfig
 from .qetypes import QEAmount
-from .util import qt_event_listener, QtEventListener
+
 
 if TYPE_CHECKING:
     from electrum.wallet import Abstract_Wallet
diff --git a/electrum/gui/qml/qechanneldetails.py b/electrum/gui/qml/qechanneldetails.py
index 9ac86b7..1f74c6f 100644
--- a/electrum/gui/qml/qechanneldetails.py
+++ b/electrum/gui/qml/qechanneldetails.py
@@ -9,12 +9,13 @@ from electrum.gui import messages
 from electrum.logging import get_logger
 from electrum.lnutil import LOCAL, REMOTE
 from electrum.lnchannel import ChanCloseOption, ChannelState, AbstractChannel, Channel, ChannelBackup
-from electrum.util import format_short_id
+from electrum.util import format_short_id, event_listener
+
+from electrum.gui.common_qt.util import QtEventListener
 
 from .auth import AuthMixin, auth_protect
 from .qewallet import QEWallet
 from .qetypes import QEAmount
-from .util import QtEventListener, event_listener
 
 if TYPE_CHECKING:
     from electrum.wallet import Abstract_Wallet
diff --git a/electrum/gui/qml/qechannellistmodel.py b/electrum/gui/qml/qechannellistmodel.py
index da6be7b..3e68bce 100644
--- a/electrum/gui/qml/qechannellistmodel.py
+++ b/electrum/gui/qml/qechannellistmodel.py
@@ -7,8 +7,9 @@ from electrum.logging import get_logger
 from electrum.util import Satoshis
 from electrum.gui import messages
 
+from electrum.gui.common_qt.util import qt_event_listener, QtEventListener
+
 from .qetypes import QEAmount
-from .util import QtEventListener, qt_event_listener
 from .qemodelfilter import QEFilterProxyModel
 
 
diff --git a/electrum/gui/qml/qefx.py b/electrum/gui/qml/qefx.py
index 5546aca..8225a3a 100644
--- a/electrum/gui/qml/qefx.py
+++ b/electrum/gui/qml/qefx.py
@@ -7,9 +7,11 @@ from electrum.bitcoin import COIN
 from electrum.exchange_rate import FxThread
 from electrum.logging import get_logger
 from electrum.simple_config import SimpleConfig
+from electrum.util import event_listener
+
+from electrum.gui.common_qt.util import QtEventListener
 
 from .qetypes import QEAmount
-from .util import QtEventListener, event_listener
 
 
 class QEFX(QObject, QtEventListener):
diff --git a/electrum/gui/qml/qeinvoice.py b/electrum/gui/qml/qeinvoice.py
index 16d4783..18f5f14 100644
--- a/electrum/gui/qml/qeinvoice.py
+++ b/electrum/gui/qml/qeinvoice.py
@@ -19,10 +19,13 @@ from electrum.bitcoin import COIN, address_to_script
 from electrum.paymentrequest import PaymentRequest
 from electrum.payment_identifier import PaymentIdentifier, PaymentIdentifierState, PaymentIdentifierType
 from electrum.network import Network
+from electrum.util import event_listener
+
+from electrum.gui.common_qt.util import QtEventListener
 
 from .qetypes import QEAmount
 from .qewallet import QEWallet
-from .util import status_update_timer_interval, QtEventListener, event_listener
+from .util import status_update_timer_interval
 from ...util import InvoiceError
 
 
diff --git a/electrum/gui/qml/qeinvoicelistmodel.py b/electrum/gui/qml/qeinvoicelistmodel.py
index 9c3442d..551afb1 100644
--- a/electrum/gui/qml/qeinvoicelistmodel.py
+++ b/electrum/gui/qml/qeinvoicelistmodel.py
@@ -8,7 +8,9 @@ from electrum.logging import get_logger
 from electrum.util import Satoshis, format_time
 from electrum.invoices import BaseInvoice, PR_EXPIRED, LN_EXPIRY_NEVER, Invoice, Request, PR_PAID
 
-from .util import QtEventListener, qt_event_listener, status_update_timer_interval
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+
+from .util import status_update_timer_interval
 from .qetypes import QEAmount
 
 if TYPE_CHECKING:
diff --git a/electrum/gui/qml/qenetwork.py b/electrum/gui/qml/qenetwork.py
index fa08882..5130bf4 100644
--- a/electrum/gui/qml/qenetwork.py
+++ b/electrum/gui/qml/qenetwork.py
@@ -7,8 +7,10 @@ from electrum import constants
 from electrum.network import ProxySettings
 from electrum.interface import ServerAddr
 from electrum.fee_policy import FEERATE_DEFAULT_RELAY
+from electrum.util import event_listener
+
+from electrum.gui.common_qt.util import QtEventListener
 
-from .util import QtEventListener, event_listener
 from .qeconfig import QEConfig
 from .qeserverlistmodel import QEServerListModel
 
diff --git a/electrum/gui/qml/qerequestdetails.py b/electrum/gui/qml/qerequestdetails.py
index d79997c..ababb00 100644
--- a/electrum/gui/qml/qerequestdetails.py
+++ b/electrum/gui/qml/qerequestdetails.py
@@ -14,9 +14,11 @@ from electrum.payment_identifier import PaymentIdentifier, PaymentIdentifierType
 from electrum.i18n import _
 from electrum.network import Network
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+
 from .qewallet import QEWallet
 from .qetypes import QEAmount
-from .util import QtEventListener, qt_event_listener, status_update_timer_interval
+from .util import status_update_timer_interval
 
 
 class QERequestDetails(QObject, QtEventListener):
diff --git a/electrum/gui/qml/qeserverlistmodel.py b/electrum/gui/qml/qeserverlistmodel.py
index b93a078..bac6578 100644
--- a/electrum/gui/qml/qeserverlistmodel.py
+++ b/electrum/gui/qml/qeserverlistmodel.py
@@ -6,7 +6,7 @@ from electrum.util import Satoshis
 from electrum.interface import ServerAddr, PREFERRED_NETWORK_PROTOCOL
 from electrum import blockchain
 
-from .util import QtEventListener, qt_event_listener
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
 
 
 class QEServerListModel(QAbstractListModel, QtEventListener):
diff --git a/electrum/gui/qml/qeswaphelper.py b/electrum/gui/qml/qeswaphelper.py
index 220003b..984befb 100644
--- a/electrum/gui/qml/qeswaphelper.py
+++ b/electrum/gui/qml/qeswaphelper.py
@@ -18,10 +18,11 @@ from electrum.fee_policy import FeePolicy
 
 from electrum.gui import messages
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+
 from .auth import AuthMixin, auth_protect
 from .qetypes import QEAmount
 from .qewallet import QEWallet
-from .util import QtEventListener, qt_event_listener
 
 if TYPE_CHECKING:
     import concurrent.futures
diff --git a/electrum/gui/qml/qetransactionlistmodel.py b/electrum/gui/qml/qetransactionlistmodel.py
index c5cfdaf..293e60e 100644
--- a/electrum/gui/qml/qetransactionlistmodel.py
+++ b/electrum/gui/qml/qetransactionlistmodel.py
@@ -8,8 +8,9 @@ from electrum.logging import get_logger
 from electrum.util import Satoshis, TxMinedInfo
 from electrum.address_synchronizer import TX_HEIGHT_FUTURE, TX_HEIGHT_LOCAL
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+
 from .qetypes import QEAmount
-from .util import QtEventListener, qt_event_listener
 
 if TYPE_CHECKING:
     from electrum.wallet import Abstract_Wallet
diff --git a/electrum/gui/qml/qetxdetails.py b/electrum/gui/qml/qetxdetails.py
index c557d80..50e885e 100644
--- a/electrum/gui/qml/qetxdetails.py
+++ b/electrum/gui/qml/qetxdetails.py
@@ -12,9 +12,10 @@ from electrum.address_synchronizer import TX_HEIGHT_UNCONF_PARENT, TX_HEIGHT_UNC
 from electrum.wallet import TxSighashDanger
 from electrum.fee_policy import FeePolicy
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+
 from .qewallet import QEWallet
 from .qetypes import QEAmount
-from .util import QtEventListener, qt_event_listener
 
 
 class QETxDetails(QObject, QtEventListener):
diff --git a/electrum/gui/qml/qetxfinalizer.py b/electrum/gui/qml/qetxfinalizer.py
index bf12004..1d09dca 100644
--- a/electrum/gui/qml/qetxfinalizer.py
+++ b/electrum/gui/qml/qetxfinalizer.py
@@ -11,7 +11,9 @@ from electrum.logging import get_logger
 from electrum.i18n import _
 from electrum.bitcoin import DummyAddress
 from electrum.transaction import PartialTxOutput, PartialTransaction, Transaction, TxOutpoint
-from electrum.util import NotEnoughFunds, profiler, quantize_feerate, UserFacingException, NoDynamicFeeEstimates
+from electrum.util import (
+    NotEnoughFunds, profiler, quantize_feerate, UserFacingException, NoDynamicFeeEstimates, event_listener
+)
 from electrum.wallet import CannotBumpFee, CannotDoubleSpendTx, CannotCPFP, BumpFeeStrategy, sweep_preparations
 from electrum import keystore
 from electrum.plugin import run_hook
@@ -19,10 +21,10 @@ from electrum.fee_policy import FeePolicy, FeeMethod
 from electrum.network import NetworkException
 
 from electrum.gui import messages
+from electrum.gui.common_qt.util import QtEventListener
 
 from .qewallet import QEWallet
 from .qetypes import QEAmount
-from .util import QtEventListener, event_listener
 
 if TYPE_CHECKING:
     from electrum.simple_config import SimpleConfig
diff --git a/electrum/gui/qml/qewallet.py b/electrum/gui/qml/qewallet.py
index 98f7994..314368a 100644
--- a/electrum/gui/qml/qewallet.py
+++ b/electrum/gui/qml/qewallet.py
@@ -13,21 +13,23 @@ from electrum.invoices import InvoiceError, PR_PAID, PR_BROADCASTING, PR_BROADCA
 from electrum.logging import get_logger
 from electrum.network import TxBroadcastError, BestEffortRequestFailed
 from electrum.transaction import PartialTransaction, Transaction
-from electrum.util import InvalidPassword, event_listener, AddTransactionException, get_asyncio_loop, NotEnoughFunds, \
-    NoDynamicFeeEstimates
+from electrum.util import (
+    InvalidPassword, event_listener, AddTransactionException, get_asyncio_loop, NotEnoughFunds, NoDynamicFeeEstimates
+)
 from electrum.lnutil import MIN_FUNDING_SAT
 from electrum.plugin import run_hook
 from electrum.wallet import Multisig_Wallet
 from electrum.crypto import pw_decode_with_version_and_mac
 from electrum.fee_policy import FeePolicy, FixedFeePolicy
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+
 from .auth import AuthMixin, auth_protect
 from .qeaddresslistmodel import QEAddressCoinListModel
 from .qechannellistmodel import QEChannelListModel
 from .qeinvoicelistmodel import QEInvoiceListModel, QERequestListModel
 from .qetransactionlistmodel import QETransactionListModel
 from .qetypes import QEAmount
-from .util import QtEventListener, qt_event_listener
 
 if TYPE_CHECKING:
     from electrum.wallet import Abstract_Wallet
diff --git a/electrum/gui/qml/util.py b/electrum/gui/qml/util.py
index 3580f39..46f3ffc 100644
--- a/electrum/gui/qml/util.py
+++ b/electrum/gui/qml/util.py
@@ -1,40 +1,10 @@
 import math
 import re
 
-from functools import wraps
 from time import time
 from typing import Tuple
 
-from PyQt6.QtCore import pyqtSignal
-
 from electrum.i18n import _
-from electrum.util import EventListener, event_listener
-
-
-class QtEventListener(EventListener):
-    qt_callback_signal = pyqtSignal(tuple)
-
-    def register_callbacks(self):
-        self.qt_callback_signal.connect(self.on_qt_callback_signal)
-        EventListener.register_callbacks(self)
-
-    def unregister_callbacks(self):
-        #self.qt_callback_signal.disconnect()
-        EventListener.unregister_callbacks(self)
-
-    def on_qt_callback_signal(self, args):
-        func = args[0]
-        return func(self, *args[1:])
-
-
-# decorator for members of the QtEventListener class
-def qt_event_listener(func):
-    func = event_listener(func)
-
-    @wraps(func)
-    def decorator(self, *args):
-        self.qt_callback_signal.emit( (func,) + args)
-    return decorator
 
 
 # return delay in msec when expiry time string should be updated
diff --git a/electrum/gui/qt/channel_details.py b/electrum/gui/qt/channel_details.py
index 99d081f..0bc1652 100644
--- a/electrum/gui/qt/channel_details.py
+++ b/electrum/gui/qt/channel_details.py
@@ -14,8 +14,8 @@ from electrum.lnaddr import LnAddr, lndecode
 from electrum.bitcoin import COIN
 from electrum.wallet import Abstract_Wallet
 
-from .util import Buttons, CloseButton, ShowQRLineEdit, MessageBoxMixin, WWLabel
-from .util import QtEventListener, qt_event_listener, VLine
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+from .util import Buttons, CloseButton, ShowQRLineEdit, MessageBoxMixin, WWLabel, VLine
 
 if TYPE_CHECKING:
     from .main_window import ElectrumWindow
diff --git a/electrum/gui/qt/confirm_tx_dialog.py b/electrum/gui/qt/confirm_tx_dialog.py
index b4ec131..990720a 100644
--- a/electrum/gui/qt/confirm_tx_dialog.py
+++ b/electrum/gui/qt/confirm_tx_dialog.py
@@ -47,9 +47,10 @@ from electrum.logging import Logger
 from electrum.submarine_swaps import NostrTransport, HttpTransport, SwapServerTransport, SwapServerError
 from electrum.gui.messages import MSG_SUBMARINE_PAYMENT_HELP_TEXT
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+
 from .util import (WindowModalDialog, ColorScheme, HelpLabel, Buttons, CancelButton, WWLabel,
-                   read_QIcon, qt_event_listener, QtEventListener, IconLabel,
-                   HelpButton, RunCoroutineDialog)
+                   read_QIcon, IconLabel, HelpButton, RunCoroutineDialog)
 from .transaction_dialog import TxSizeLabel, TxFiatLabel, TxInOutWidget
 from .fee_slider import FeeSlider, FeeComboBox
 from .amountedit import FeerateEdit, BTCAmountEdit
diff --git a/electrum/gui/qt/lightning_dialog.py b/electrum/gui/qt/lightning_dialog.py
index ec9ea9f..328f167 100644
--- a/electrum/gui/qt/lightning_dialog.py
+++ b/electrum/gui/qt/lightning_dialog.py
@@ -29,8 +29,9 @@ from PyQt6.QtWidgets import (QDialog, QLabel, QVBoxLayout, QPushButton)
 
 from electrum.i18n import _
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
+
 from .util import Buttons
-from .util import QtEventListener, qt_event_listener
 
 if TYPE_CHECKING:
     from . import ElectrumGui
diff --git a/electrum/gui/qt/main_window.py b/electrum/gui/qt/main_window.py
index 63818cb..6b85422 100644
--- a/electrum/gui/qt/main_window.py
+++ b/electrum/gui/qt/main_window.py
@@ -58,7 +58,7 @@ from electrum.util import (format_time, UserCancelled, profiler, bfh, InvalidPas
                            UserFacingException, get_new_wallet_name,
                            send_exception_to_crash_reporter,
                            AddTransactionException, os_chmod, UI_UNIT_NAME_TXSIZE_VBYTES,
-                           is_valid_email, ChoiceItem)
+                           is_valid_email, ChoiceItem, event_listener)
 from electrum.bip21 import BITCOIN_BIP21_URI_SCHEME
 from electrum.payment_identifier import PaymentIdentifier
 from electrum.invoices import PR_PAID, Invoice
@@ -77,6 +77,8 @@ from electrum.lnaddr import lndecode, LnAddr
 from electrum.submarine_swaps import SwapServerTransport, NostrTransport
 from electrum.fee_policy import FeePolicy
 
+from electrum.gui.common_qt.util import TaskThread, QtEventListener, qt_event_listener
+
 from .rate_limiter import rate_limited
 from .exception_window import Exception_Hook
 from .amountedit import BTCAmountEdit
@@ -90,8 +92,7 @@ from .util import (read_QIcon, ColorScheme, text_dialog, icon_path, WaitingDialo
                    CloseButton, MessageBoxMixin, EnterButton, import_meta_gui, export_meta_gui,
                    filename_field, address_field, char_width_in_lineedit, webopen,
                    TRANSACTION_FILE_EXTENSION_FILTER_ANY, MONOSPACE_FONT,
-                   getOpenFileName, getSaveFileName, ShowQRLineEdit, QtEventListener, qt_event_listener,
-                   event_listener, scan_qr_from_screenshot)
+                   getOpenFileName, getSaveFileName, ShowQRLineEdit, scan_qr_from_screenshot)
 from .wizard.wallet import WIF_HELP_TEXT
 from .history_list import HistoryList, HistoryModel
 from .update_checker import UpdateCheck, UpdateCheckThread
@@ -103,8 +104,6 @@ from .swap_dialog import SwapDialog, InvalidSwapParameters
 from .balance_dialog import (BalanceToolButton, COLOR_FROZEN, COLOR_UNMATURED, COLOR_UNCONFIRMED, COLOR_CONFIRMED,
                              COLOR_LIGHTNING, COLOR_FROZEN_LIGHTNING)
 
-from electrum.gui.common_qt.util import TaskThread
-
 if TYPE_CHECKING:
     from . import ElectrumGui
     from electrum.submarine_swaps import SwapOffer
diff --git a/electrum/gui/qt/network_dialog.py b/electrum/gui/qt/network_dialog.py
index 9545e45..8d72deb 100644
--- a/electrum/gui/qt/network_dialog.py
+++ b/electrum/gui/qt/network_dialog.py
@@ -41,12 +41,11 @@ from electrum.logging import get_logger
 from electrum.util import is_valid_websocket_url
 from electrum.gui import messages
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
 from .util import (
-    Buttons, CloseButton, HelpButton, read_QIcon, char_width_in_lineedit, PasswordLineEdit, QtEventListener,
-    qt_event_listener, Spinner, HelpLabel
+    Buttons, CloseButton, HelpButton, read_QIcon, char_width_in_lineedit, PasswordLineEdit, Spinner, HelpLabel
 )
 
-
 _logger = get_logger(__name__)
 
 protocol_names = ['TCP', 'SSL']
diff --git a/electrum/gui/qt/settings_dialog.py b/electrum/gui/qt/settings_dialog.py
index 8e727a2..1655e17 100644
--- a/electrum/gui/qt/settings_dialog.py
+++ b/electrum/gui/qt/settings_dialog.py
@@ -35,10 +35,10 @@ from electrum.i18n import _, get_gui_lang_names
 from electrum import util
 from electrum.util import base_units_list, event_listener
 
+from electrum.gui.common_qt.util import QtEventListener
 from electrum.gui import messages
 
-from .util import ColorScheme, HelpLabel, Buttons, CloseButton, QtEventListener
-
+from .util import ColorScheme, HelpLabel, Buttons, CloseButton
 
 if TYPE_CHECKING:
     from electrum.simple_config import SimpleConfig, ConfigVarWithConfig
diff --git a/electrum/gui/qt/swap_dialog.py b/electrum/gui/qt/swap_dialog.py
index 6676205..3cdc084 100644
--- a/electrum/gui/qt/swap_dialog.py
+++ b/electrum/gui/qt/swap_dialog.py
@@ -15,12 +15,13 @@ from electrum.transaction import PartialTxOutput, PartialTransaction
 from electrum.fee_policy import FeePolicy
 from electrum.submarine_swaps import NostrTransport
 
+from electrum.gui.common_qt.util import QtEventListener, qt_event_listener
 from electrum.gui import messages
+
 from . import util
 from .util import (WindowModalDialog, Buttons, OkButton, CancelButton,
                    EnterButton, ColorScheme, WWLabel, read_QIcon, IconLabel, char_width_in_lineedit,
                    pubkey_to_q_icon)
-from .util import qt_event_listener, QtEventListener
 from .amountedit import BTCAmountEdit
 from .fee_slider import FeeSlider, FeeComboBox
 from .my_treeview import create_toolbar_with_menu, MyTreeView
diff --git a/electrum/gui/qt/util.py b/electrum/gui/qt/util.py
index 3f11a60..2a62395 100644
--- a/electrum/gui/qt/util.py
+++ b/electrum/gui/qt/util.py
@@ -7,7 +7,7 @@ import queue
 import os
 import webbrowser
 import ctypes
-from functools import partial, lru_cache, wraps
+from functools import partial, lru_cache
 from typing import (NamedTuple, Callable, Optional, TYPE_CHECKING, List, Any, Sequence, Tuple, Union)
 
 from PyQt6 import QtCore
@@ -21,7 +21,7 @@ from PyQt6.QtWidgets import (QPushButton, QLabel, QMessageBox, QHBoxLayout, QVBo
                              QFrame, QAbstractButton)
 
 from electrum.i18n import _
-from electrum.util import (FileImportFailed, FileExportFailed, resource_path, EventListener, event_listener,
+from electrum.util import (FileImportFailed, FileExportFailed, resource_path, EventListener,
                            get_logger, UserCancelled, UserFacingException, ChoiceItem)
 from electrum.invoices import (PR_UNPAID, PR_PAID, PR_EXPIRED, PR_INFLIGHT, PR_UNKNOWN, PR_FAILED, PR_ROUTING,
                                PR_UNCONFIRMED, PR_BROADCASTING, PR_BROADCAST)
@@ -1480,36 +1480,6 @@ class ImageGraphicsEffect(QObject):
         return result
 
 
-class QtEventListener(EventListener):
-    qt_callback_signal = QtCore.pyqtSignal(tuple)
-
-    def register_callbacks(self):
-        self.qt_callback_signal.connect(self.on_qt_callback_signal)
-        EventListener.register_callbacks(self)
-
-    def unregister_callbacks(self):
-        try:
-            self.qt_callback_signal.disconnect()
-        except (RuntimeError, TypeError):  # wrapped Qt object might be deleted
-            # "TypeError: disconnect() failed between 'qt_callback_signal' and all its connections"
-            pass
-        EventListener.unregister_callbacks(self)
-
-    def on_qt_callback_signal(self, args):
-        func = args[0]
-        return func(self, *args[1:])
-
-
-# decorator for members of the QtEventListener class
-def qt_event_listener(func):
-    func = event_listener(func)
-
-    @wraps(func)
-    def decorator(self, *args):
-        self.qt_callback_signal.emit( (func,) + args)
-    return decorator
-
-
 def insert_spaces(text: str, every_chars: int) -> str:
     '''Insert spaces at every Nth character to allow for WordWrap'''
     return ' '.join(text[i:i+every_chars] for i in range(0, len(text), every_chars))