Hello,
I define a couple QUndoCommand classes based on a mixin, where the undo
command of one is the redo of the other, and vice-versa. See the attached
file.
Unfortunately this has stopped working with PyQt 4.6. Executing the
attached file prints "inserting foo", "removing bar" with PyQt <= 4.5,
but does nothing with 4.6.
Is this breakage expected? Is my usage not supported? Many thanks in
advance.
--
- Are you sure we're good?
- Always.
-- Rory and Lorelai
#! /usr/bin/python
from PyQt4 import QtGui
##
class Mixin(object):
def __init__(self, what):
self.what = what
def insert(self):
print 'inserting', self.what
def remove(self):
print 'removing', self.what
##
class InsertCmd(QtGui.QUndoCommand, Mixin):
def __init__(self, what):
QtGui.QUndoCommand.__init__(self, 'insert ' + what)
Mixin.__init__(self, what)
undo = Mixin.remove
redo = Mixin.insert
class RemoveCmd(QtGui.QUndoCommand, Mixin):
def __init__(self, what):
QtGui.QUndoCommand.__init__(self, 'remove ' + what)
Mixin.__init__(self, what)
undo = Mixin.insert
redo = Mixin.remove
##
undo_stack = QtGui.QUndoStack()
insert_cmd = InsertCmd('foo')
remove_cmd = RemoveCmd('bar')
undo_stack.push(insert_cmd)
undo_stack.push(remove_cmd)
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