roar/libcanvas/CanvasJournal.py
2019-09-09 12:46:52 +02:00

72 lines
2.3 KiB
Python

#!/usr/bin/env python3
#
# CanvasJournal.py
# Copyright (c) 2018, 2019 Lucio Andrés Illanes Albornoz <lucio@lucioillanes.de>
#
class CanvasJournal():
# {{{ popCursor(self)
def popCursor(self):
if len(self.patchesCursor):
patchesCursor = self.patchesCursor; self.patchesCursor = [];
return patchesCursor
else:
return []
# }}}
# {{{ popRedo(self)
def popRedo(self):
if self.patchesUndoLevel > 0:
self.patchesUndoLevel -= 1; patches = self.patchesUndo[self.patchesUndoLevel];
return patches[1]
else:
return []
# }}}
# {{{ popUndo(self)
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)
def pushCursor(self, patches):
self.patchesCursor.append(patches)
# }}}
# {{{ pushDeltas(self, redoPatches, undoPatches)
def pushDeltas(self, redoPatches, undoPatches):
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)
def resetCursor(self):
if self.patchesCursor != None:
self.patchesCursor.clear()
self.patchesCursor = []
# }}}
# {{{ resetUndo(self)
def resetUndo(self):
if self.patchesUndo != None:
self.patchesUndo.clear()
self.patchesUndo = [None]; self.patchesUndoLevel = 0;
# }}}
# {{{ updateCurrentDeltas(self, redoPatches, undoPatches)
def updateCurrentDeltas(self, redoPatches, undoPatches):
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.patchesCursor, self.patchesUndo, self. patchesUndoLevel = None, None, None
self.resetCursor(); self.resetUndo();
# vim:expandtab foldmethod=marker sw=4 ts=4 tw=120