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# Copyright (c) 2015 Ultimaker B.V.
# Uranium is released under the terms of the LGPLv3 or higher.
import time
class Operation:
"""Base class for operations that should support undo and redo."""
def __init__(self) -> None:
super().__init__()
self._timestamp = time.time()
self._always_merge = False
def undo(self) -> None:
"""Undo the operation.
This should be reimplemented by subclasses to perform all actions necessary to
redo the operation.
"""
raise NotImplementedError("Undo should be reimplemented by subclasses")
def redo(self) -> None:
"""Redo the operation.
This should be reimplemented by subclasses to perform all actions necessary to
redo the operation.
:note This is automatically called when the operation is first put onto the OperationStack.
"""
raise NotImplementedError("Redo should be reimplemented by subclasses")
def mergeWith(self, other):
"""Perform operation merging.
This will be called by OperationStack to perform merging of operations.
If this operation can be merged with `other`, it should return a new operation that
is the combination of this operation and `other`. If it cannot be merged, False should
be returned.
:param other: :type{Operation} The operation to merge with.
:return: An operation when this operation and `other` can be merged, or False if they cannot be merged.
"""
return False
def push(self) -> None:
"""Push the operation onto the stack.
This is a convenience method that pushes this operation onto the Application's
operation stack.
"""
# Because of circular dependency
from UM.Application import Application
Application.getInstance().getOperationStack().push(self)
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