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class Accumulator(object):
def __init__(self):
self.pointer = 0
self.pointed_obj = None
def move(self, relative=0, absolute=None, pages=False):
i = self.pointer
lst = self.get_list()
if not lst:
return self.pointer
length = len(lst)
if isinstance(absolute, int):
if absolute < 0: # wrap
i = absolute + length
else:
i = absolute
if pages:
i += relative * self.get_height()
else:
i += relative
i = int(i)
if i >= length:
i = length - 1
if i < 0:
i = 0
self.pointer = i
self.correct_pointer()
return self.pointer
def move_to_obj(self, arg, attr=None):
if not arg:
return
lst = self.get_list()
if not lst:
return
do_get_attr = isinstance(attr, str)
good = arg
if do_get_attr:
try:
good = getattr(arg, attr)
except (TypeError, AttributeError):
pass
for obj, i in zip(lst, range(len(lst))):
if do_get_attr:
try:
test = getattr(obj, attr)
except AttributeError:
continue
else:
test = obj
if test == good:
self.move(absolute=i)
return True
return self.move(absolute=self.pointer)
def correct_pointer(self):
lst = self.get_list()
if not lst:
self.pointer = 0
self.pointed_obj = None
else:
i = self.pointer
if i is None:
i = 0
if i >= len(lst):
i = len(lst) - 1
if i < 0:
i = 0
self.pointer = i
self.pointed_obj = lst[i]
def pointer_is_synced(self):
lst = self.get_list()
try:
return lst[self.pointer] == self.pointed_obj
except (IndexError, KeyError):
return False
def sync_index(self, **kw):
self.move_to_obj(self.pointed_obj, **kw)
def get_list(self):
"""OVERRIDE THIS"""
return []
def get_height(self):
"""OVERRIDE THIS"""
return 25
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