136 lines
4.4 KiB
Python
136 lines
4.4 KiB
Python
# Copyright: Ankitects Pty Ltd and contributors
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# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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from __future__ import annotations
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from concurrent.futures._base import Future
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from typing import Any, Callable, Generic, Optional, Protocol, TypeVar, Union
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import aqt
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from anki.collection import (
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Collection,
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OpChanges,
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OpChangesAfterUndo,
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OpChangesWithCount,
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OpChangesWithId,
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)
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from aqt.qt import QWidget
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from aqt.utils import showWarning
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class HasChangesProperty(Protocol):
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changes: OpChanges
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# either an OpChanges object, or an object with .changes on it. This bound
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# doesn't actually work for protobuf objects, so new protobuf objects will
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# either need to be added here, or cast at call time
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ResultWithChanges = TypeVar(
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"ResultWithChanges",
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bound=Union[
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OpChanges,
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OpChangesWithCount,
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OpChangesWithId,
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OpChangesAfterUndo,
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HasChangesProperty,
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],
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)
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CollectionOpSuccessCallback = Callable[[ResultWithChanges], Any]
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CollectionOpFailureCallback = Optional[Callable[[Exception], Any]]
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class CollectionOp(Generic[ResultWithChanges]):
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"""Helper to perform a mutating DB operation on a background thread, and update UI.
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`op` should either return OpChanges, or an object with a 'changes'
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property. The changes will be passed to `operation_did_execute` so that
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the UI can decide whether it needs to update itself.
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- Shows progress popup for the duration of the op.
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- Ensures the browser doesn't try to redraw during the operation, which can lead
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to a frozen UI
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- Updates undo state at the end of the operation
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- Commits changes
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- Fires the `operation_(will|did)_reset` hooks
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- Fires the legacy `state_did_reset` hook
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Be careful not to call any UI routines in `op`, as that may crash Qt.
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This includes things select .selectedCards() in the browse screen.
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`success` will be called with the return value of op().
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If op() throws an exception, it will be shown in a popup, or
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passed to `failure` if it is provided.
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"""
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_success: Optional[Callable[[ResultWithChanges], Any]] = None
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_failure: Optional[CollectionOpFailureCallback] = None
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def __init__(self, parent: QWidget, op: Callable[[Collection], ResultWithChanges]):
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self._parent = parent
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self._op = op
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def success(
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self, success: Optional[Callable[[ResultWithChanges], Any]]
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) -> CollectionOp[ResultWithChanges]:
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self._success = success
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return self
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def failure(
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self, failure: Optional[CollectionOpFailureCallback]
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) -> CollectionOp[ResultWithChanges]:
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self._failure = failure
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return self
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def run_in_background(self, *, initiator: Optional[object] = None) -> None:
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aqt.mw._increase_background_ops()
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def wrapped_op() -> ResultWithChanges:
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return self._op(aqt.mw.col)
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def wrapped_done(future: Future) -> None:
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aqt.mw._decrease_background_ops()
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# did something go wrong?
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if exception := future.exception():
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if isinstance(exception, Exception):
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if self._failure:
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self._failure(exception)
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else:
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showWarning(str(exception), self._parent)
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return
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else:
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# BaseException like SystemExit; rethrow it
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future.result()
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result = future.result()
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try:
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if self._success:
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self._success(result)
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finally:
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# update undo status
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status = aqt.mw.col.undo_status()
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aqt.mw._update_undo_actions_for_status_and_save(status)
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# fire change hooks
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self._fire_change_hooks_after_op_performed(result, initiator)
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aqt.mw.taskman.with_progress(wrapped_op, wrapped_done)
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def _fire_change_hooks_after_op_performed(
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self,
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result: ResultWithChanges,
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handler: Optional[object],
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) -> None:
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if isinstance(result, OpChanges):
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changes = result
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else:
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changes = result.changes
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# fire new hook
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print("op changes:")
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print(changes)
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aqt.gui_hooks.operation_did_execute(changes, handler)
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# fire legacy hook so old code notices changes
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if aqt.mw.col.op_made_changes(changes):
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aqt.gui_hooks.state_did_reset()
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