blob: d743a4720872f8ea42fe33bde088287f0cfb9637 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
# -*- coding: utf-8; mode: python; -*-
#
# GStreamer Development Utilities
#
# Copyright (C) 2007 René Stadler <mail@renestadler.de>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 3 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.
"""GStreamer Development Utilities Common Data module."""
import gi
from gi.repository import GObject
class Dispatcher (object):
def __call__(self, iterator):
raise NotImplementedError("derived classes must override this method")
def cancel(self):
pass
class DefaultDispatcher (Dispatcher):
def __call__(self, iterator):
for x in iterator:
pass
class GSourceDispatcher (Dispatcher):
def __init__(self):
Dispatcher.__init__(self)
self.source_id = None
def __call__(self, iterator):
if self.source_id is not None:
GObject.source_remove(self.source_id)
def iteration():
r = iterator.__next__()
if not r:
self.source_id = None
return r
self.source_id = GObject.idle_add(
iteration, priority=GObject.PRIORITY_LOW)
def cancel(self):
if self.source_id is None:
return
GObject.source_remove(self.source_id)
self.source_id = None
|
