qml QEChannelDetails: add some type hints

electrum/gui/qml/qechanneldetails.py

@@ -1,5 +1,6 @@
 import threading
 from enum import IntEnum
+from typing import Optional, TYPE_CHECKING
 
 from PyQt6.QtCore import pyqtProperty, pyqtSignal, pyqtSlot, QObject, pyqtEnum
 
@@ -7,7 +8,7 @@ from electrum.i18n import _
 from electrum.gui import messages
 from electrum.logging import get_logger
 from electrum.lnutil import LOCAL, REMOTE
-from electrum.lnchannel import ChanCloseOption, ChannelState
+from electrum.lnchannel import ChanCloseOption, ChannelState, AbstractChannel, Channel
 from electrum.util import format_short_id
 
 from .auth import AuthMixin, auth_protect
@@ -33,9 +34,9 @@ class QEChannelDetails(AuthMixin, QObject, QtEventListener):
     def __init__(self, parent=None):
         super().__init__(parent)
 
-        self._wallet = None
+        self._wallet = None  # type: Optional[QEWallet]
-        self._channelid = None
+        self._channelid = None  # type: Optional[str]
-        self._channel = None
+        self._channel = None  # type: Optional[AbstractChannel]
 
         self._capacity = QEAmount()
         self._local_capacity = QEAmount()

electrum/lnchannel.py

@@ -290,6 +290,12 @@ class AbstractChannel(Logger, ABC):
     def is_backup(self):
         return False
 
+    def get_local_scid_alias(self, *, create_new_if_needed: bool = False) -> Optional[bytes]:
+        return None
+
+    def get_remote_scid_alias(self) -> Optional[bytes]:
+        return None
+
     def sweep_ctx(self, ctx: Transaction) -> Dict[str, SweepInfo]:
         txid = ctx.txid()
         if self._sweep_info.get(txid) is None:
@@ -468,6 +474,10 @@ class AbstractChannel(Logger, ABC):
         """Returns channel capacity in satoshis, or None if unknown."""
         pass
 
+    @abstractmethod
+    def can_be_deleted(self) -> bool:
+        pass
+
 
 class ChannelBackup(AbstractChannel):
     """
@@ -558,12 +568,6 @@ class ChannelBackup(AbstractChannel):
     def is_backup(self):
         return True
 
-    def get_local_scid_alias(self, *, create_new_if_needed: bool = False) -> Optional[bytes]:
-        return None
-
-    def get_remote_scid_alias(self) -> Optional[bytes]:
-        return None
-
     def create_sweeptxs_for_their_ctx(self, ctx):
         return {}