/usr/share/pyshared/gst-0.10/gst/extend/pygobject.py is in python-gst0.10 0.10.22-3.
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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 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 | #!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
#
# GStreamer python bindings
# Copyright (C) 2004 Johan Dahlin <johan at gnome dot org>
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""
PyGTK helper functions
"""
import sys
import gobject
def gobject_set_property(object, property, value):
"""
Set the given property to the given value on the given object.
@type object: L{gobject.GObject}
@type property: string
@param value: value to set property to
"""
for pspec in gobject.list_properties(object):
if pspec.name == property:
break
else:
raise errors.PropertyError(
"Property '%s' in element '%s' does not exist" % (
property, object.get_property('name')))
if pspec.value_type in (gobject.TYPE_INT, gobject.TYPE_UINT,
gobject.TYPE_INT64, gobject.TYPE_UINT64):
try:
value = int(value)
except ValueError:
msg = "Invalid value given for property '%s' in element '%s'" % (
property, object.get_property('name'))
raise errors.PropertyError(msg)
elif pspec.value_type == gobject.TYPE_BOOLEAN:
if value == 'False':
value = False
elif value == 'True':
value = True
else:
value = bool(value)
elif pspec.value_type in (gobject.TYPE_DOUBLE, gobject.TYPE_FLOAT):
value = float(value)
elif pspec.value_type == gobject.TYPE_STRING:
value = str(value)
# FIXME: this is superevil ! we really need to find a better way
# of checking if this property is a param enum
# also, we only allow int for now
elif repr(pspec.__gtype__).startswith("<GType GParamEnum"):
value = int(value)
else:
raise errors.PropertyError('Unknown property type: %s' %
pspec.value_type)
object.set_property(property, value)
def gsignal(name, *args):
"""
Add a GObject signal to the current object.
To be used from class definition scope.
@type name: string
@type args: mixed
"""
frame = sys._getframe(1)
_locals = frame.f_locals
if not '__gsignals__' in _locals:
_dict = _locals['__gsignals__'] = {}
else:
_dict = _locals['__gsignals__']
_dict[name] = (gobject.SIGNAL_RUN_FIRST, None, args)
PARAM_CONSTRUCT = 1<<9
def with_construct_properties(__init__):
"""
Wrap a class' __init__ method in a procedure that will construct
gobject properties. This is necessary because pygtk's object
construction is a bit broken.
Usage::
class Foo(GObject):
def __init__(self):
GObject.__init(self)
__init__ = with_construct_properties(__init__)
"""
frame = sys._getframe(1)
_locals = frame.f_locals
gproperties = _locals['__gproperties__']
def hacked_init(self, *args, **kwargs):
__init__(self, *args, **kwargs)
self.__gproperty_values = {}
for p, v in gproperties.items():
if v[-1] & PARAM_CONSTRUCT:
self.set_property(p, v[3])
return hacked_init
def gproperty(type_, name, desc, *args, **kwargs):
"""
Add a GObject property to the current object.
To be used from class definition scope.
@type type_: type object
@type name: string
@type desc: string
@type args: mixed
"""
frame = sys._getframe(1)
_locals = frame.f_locals
flags = 0
def _do_get_property(self, prop):
try:
return self._gproperty_values[prop.name]
except (AttributeError, KeyError):
raise AttributeError('Property was never set', self, prop)
def _do_set_property(self, prop, value):
if not getattr(self, '_gproperty_values', None):
self._gproperty_values = {}
self._gproperty_values[prop.name] = value
_locals['do_get_property'] = _do_get_property
_locals['do_set_property'] = _do_set_property
if not '__gproperties__' in _locals:
_dict = _locals['__gproperties__'] = {}
else:
_dict = _locals['__gproperties__']
for i in 'readable', 'writable':
if not i in kwargs:
kwargs[i] = True
for k, v in kwargs.items():
if k == 'construct':
flags |= PARAM_CONSTRUCT
elif k == 'construct_only':
flags |= gobject.PARAM_CONSTRUCT_ONLY
elif k == 'readable':
flags |= gobject.PARAM_READABLE
elif k == 'writable':
flags |= gobject.PARAM_WRITABLE
elif k == 'lax_validation':
flags |= gobject.PARAM_LAX_VALIDATION
else:
raise Exception('Invalid GObject property flag: %r=%r' % (k, v))
_dict[name] = (type_, name, desc) + args + tuple((flags,))
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