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Optimize ListModel setProperty() and update()

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Avoid emiting dataChanged signals when nothing actually changed
This commit is contained in:
miruka 2019-05-09 16:08:34 -04:00
parent 4367f52ce5
commit df088a8daa
1 changed files with 25 additions and 16 deletions
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41
harmonyqml/backend/model/list_model.py
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@ -1,7 +1,7 @@
import logging import logging
from typing import ( from typing import (
Any, Callable, Dict, Iterable, List, Mapping, MutableSequence, Optional, Any, Callable, Dict, Iterable, List, Mapping, MutableSequence, Optional,
Sequence, Tuple, Union Sequence, Set, Tuple, Union
) )
from PyQt5.QtCore import ( from PyQt5.QtCore import (
@ -217,18 +217,26 @@ class ListModel(QAbstractListModel):
to_update = self[i_index] to_update = self[i_index]
for role in self.roles: updated_roles: Set[int] = set()
if role not in ignore_roles:
try: for role_name, role_num in self.roleNumbers().items():
setattr(to_update, role, getattr(value, role)) if role_name not in ignore_roles:
except AttributeError: # constant/not settable old_value = getattr(to_update, role_name)
pass new_value = getattr(value, role_name)
if old_value != new_value:
try:
setattr(to_update, role_name, new_value)
except AttributeError: # constant/not settable
pass
else:
updated_roles.add(role_num)
if updated_roles:
qidx = QAbstractListModel.index(self, i_index, 0)
self.dataChanged.emit(qidx, qidx, updated_roles)
self.changed.emit()
qidx = QAbstractListModel.index(self, i_index, 0)
updated = [number for name, number in self.roleNumbers().items()
if name not in ignore_roles]
self.dataChanged.emit(qidx, qidx, updated)
self.changed.emit()
return i_index return i_index
@ -270,10 +278,11 @@ class ListModel(QAbstractListModel):
i_index: int = self.indexWhere(self.mainKey, index) \ i_index: int = self.indexWhere(self.mainKey, index) \
if isinstance(index, str) else index if isinstance(index, str) else index
setattr(self[i_index], prop, value) if getattr(self[i_index], prop) != value:
qidx = QAbstractListModel.index(self, i_index, 0) setattr(self[i_index], prop, value)
self.dataChanged.emit(qidx, qidx, (self.roleNumbers()[prop],)) qidx = QAbstractListModel.index(self, i_index, 0)
self.changed.emit() self.dataChanged.emit(qidx, qidx, (self.roleNumbers()[prop],))
self.changed.emit()
@pyqtSlot(int, int) @pyqtSlot(int, int)