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history.py
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history.py
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## INFO ########################################################################
## ##
## plastey ##
## ======= ##
## ##
## Oculus Rift + Leap Motion + Python 3 + C + Blender + Arch Linux ##
## Version: 0.2.0.933 (20150509) ##
## File: history.py ##
## ##
## For more information about the project, visit ##
## <http://plastey.kibu.hu>. ##
## Copyright (C) 2015 Peter Varo, Kitchen Budapest ##
## ##
## This program is free software: you can redistribute it and/or modify it ##
## under the terms of the GNU General Public License as published by the ##
## Free Software Foundation, either version 3 of the License, or ##
## (at your option) any later version. ##
## ##
## This program is distributed in the hope that it will be useful, but ##
## WITHOUT ANY WARRANTY; without even the implied warranty of ##
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ##
## See the GNU General Public License for more details. ##
## ##
## You should have received a copy of the GNU General Public License ##
## along with this program, most likely a file in the root directory, ##
## called 'LICENSE'. If not, see <http://www.gnu.org/licenses>. ##
## ##
######################################################################## INFO ##
from collections import deque
#------------------------------------------------------------------------------#
class History(deque):
NONE = -1
UNDO = 0
REDO = 1
UNDO_PREFIX = '[UNDO] '
REDO_PREFIX = '[REDO] '
NONE_PREFIX = ''
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
@staticmethod
def event(function):
return lambda direction, prefix: function(direction, prefix)
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
def __init__(self, function_if_empty, max_size=64, *args, **kwargs):
super().__init__(*args, **kwargs)
self._index = 0
self._empty = function_if_empty
# Set memory limit
max_len = self.maxlen
if (max_len is not None and
max_size <= max_len):
self._max_size = max_len
else:
self._max_size = max_size
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
def push(self, undo, redo):
after_undo = False
# If there was an undo before
for i in range(self._index + 1, len(self)):
after_undo = True
self.pop()
# If hit the memory limit
if len(self) >= self._max_size:
self.popleft()
# If this is after an undo call
elif after_undo:
self._index += 2
# If this is npot after an undo call
# nor hit the memory limit
else:
self._index += 1
# Finally add the new element
self.append((undo, redo))
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
def do(self):
try:
self[self._index][self.REDO](self.NONE, self.NONE_PREFIX)
except IndexError:
self._empty(self.NONE, self.NONE_PREFIX)
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
def undo(self):
try:
self._index -= 1
self[self._index][self.UNDO](self.UNDO, self.UNDO_PREFIX)
except IndexError:
self._empty(self.UNDO, self.UNDO_PREFIX)
self._index = 0
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
def redo(self):
try:
self._index += 1
self[self._index][self.REDO](self.REDO, self.REDO_PREFIX)
except IndexError:
self._empty(self.REDO, self.REDO_PREFIX)
self._index = 0