roar/libcanvas/CanvasJournal.py
Lucio Andrés Illanes Albornoz 74da2e43c9 ROAR!
2019-09-03 18:58:50 +02:00

80 lines
2.4 KiB
Python

#!/usr/bin/env python3
#
# CanvasJournal.py -- XXX
# Copyright (c) 2018 Lucio Andrés Illanes Albornoz <lucio@lucioillanes.de>
#
class CanvasJournal():
"""XXX"""
patchesCursor = patchesUndo = patchesUndoLevel = None
# {{{ popCursor(self): XXX
def popCursor(self):
if len(self.patchesCursor):
patchesCursor = self.patchesCursor
self.patchesCursor = []
return patchesCursor
else:
return []
# }}}
# {{{ popRedo(self): XXX
def popRedo(self):
if self.patchesUndoLevel > 0:
self.patchesUndoLevel -= 1
patches = self.patchesUndo[self.patchesUndoLevel]
return patches[1]
else:
return []
# }}}
# {{{ popUndo(self): XXX
def popUndo(self):
if self.patchesUndo[self.patchesUndoLevel] != None:
patches = self.patchesUndo[self.patchesUndoLevel]
self.patchesUndoLevel += 1
return patches[0]
else:
return []
# }}}
# {{{ pushCursor(self, patches): XXX
def pushCursor(self, patches):
self.patchesCursor.append(patches)
# }}}
# {{{ pushDeltas(self, undoPatches, redoPatches): XXX
def pushDeltas(self, undoPatches, redoPatches):
if self.patchesUndoLevel > 0:
del self.patchesUndo[0:self.patchesUndoLevel]
self.patchesUndoLevel = 0
deltaItem = [undoPatches, redoPatches]
self.patchesUndo.insert(0, deltaItem)
return deltaItem
# }}}
# {{{ resetCursor(self): XXX
def resetCursor(self):
if self.patchesCursor != None:
self.patchesCursor.clear()
self.patchesCursor = []
# }}}
# {{{ resetUndo(self): XXX
def resetUndo(self):
if self.patchesUndo != None:
self.patchesUndo.clear()
self.patchesUndo = [None]; self.patchesUndoLevel = 0;
# }}}
# {{{ updateCurrentDeltas(self, undoPatches, redoPatches): XXX
def updateCurrentDeltas(self, undoPatches, redoPatches):
self.patchesUndo[0][0].append(undoPatches)
self.patchesUndo[0][1].append(redoPatches)
# }}}
# {{{ __del__(self): destructor method
def __del__(self):
self.resetCursor(); self.resetUndo();
# }}}
#
# __init__(self): initialisation method
def __init__(self):
self.resetCursor(); self.resetUndo();
# vim:expandtab foldmethod=marker sw=4 ts=4 tw=120