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# This file is part of ranger, the console file manager.
# License: GNU GPL version 3, see the file "AUTHORS" for details.
from ranger.ext.direction import Direction
class Accumulator(object):
def __init__(self):
self.pointer = 0
self.pointed_obj = None
def move(self, narg=None, **keywords):
direction = Direction(keywords)
lst = self.get_list()
if not lst:
return self.pointer
pointer = direction.move(
direction=direction.down(),
maximum=len(lst),
override=narg,
pagesize=self.get_height(),
current=self.pointer)
self.pointer = pointer
self.correct_pointer()
return 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(to=i)
return True
return self.move(to=self.pointer)
# XXX Is this still necessary? move() ensures correct pointer position
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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