sugar-toolkit-gtk3/src/sugar3/graphics/objectchooser.py

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# Copyright (C) 2007, One Laptop Per Child
#
# 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 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., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
"""
STABLE.
"""
import logging
import StringIO
import cairo
from gi.repository import GObject
from gi.repository import Gtk
from gi.repository import Gdk
import dbus
from sugar3.datastore import datastore
from sugar3.activity.activity import PREVIEW_SIZE
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J_DBUS_SERVICE = 'org.laptop.Journal'
J_DBUS_INTERFACE = 'org.laptop.Journal'
J_DBUS_PATH = '/org/laptop/Journal'
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FILTER_TYPE_MIME_BY_ACTIVITY = 'mime_by_activity'
FILTER_TYPE_GENERIC_MIME = 'generic_mime'
FILTER_TYPE_ACTIVITY = 'activity'
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def get_preview_pixbuf(preview_data, width=-1, height=-1):
"""Retrive a pixbuf with the content of the preview field
Keyword arguments:
metadata -- the metadata dictionary.
Can't be None, use metadata.get('preview', '')
width -- the pixbuf width, if is not set, the default width will be used
height -- the pixbuf width, if is not set, the default height will be used
Return: a Pixbuf or None if couldn't create it
"""
if width == -1:
width = PREVIEW_SIZE[0]
if height == -1:
height = PREVIEW_SIZE[1]
pixbuf = None
if len(preview_data) > 4:
if preview_data[1:4] != 'PNG':
# TODO: We are close to be able to drop this.
import base64
preview_data = base64.b64decode(preview_data)
png_file = StringIO.StringIO(preview_data)
try:
# Load image and scale to dimensions
surface = cairo.ImageSurface.create_from_png(png_file)
png_width = surface.get_width()
png_height = surface.get_height()
preview_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32,
width, height)
cr = cairo.Context(preview_surface)
scale_w = width * 1.0 / png_width
scale_h = height * 1.0 / png_height
scale = min(scale_w, scale_h)
cr.scale(scale, scale)
cr.set_source_rgba(1, 1, 1, 0)
cr.set_operator(cairo.OPERATOR_SOURCE)
cr.paint()
cr.set_source_surface(surface)
cr.paint()
pixbuf = Gdk.pixbuf_get_from_surface(preview_surface, 0, 0,
width, height)
except Exception:
logging.exception('Error while loading the preview')
return pixbuf
class ObjectChooser(object):
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def __init__(self, parent=None, what_filter=None, filter_type=None,
show_preview=False):
"""Initialise the ObjectChoser
parent -- the widget calling ObjectChooser
what_filter -- string
string should be an activity bundle_id or a generic mime
type as defined in mime.py used to determine which objects
will be presented in the object chooser
filter_type -- string
string should be one of [None, FILTER_TYPE_GENERIC_MIME,
FILTER_TYPE_ACTIVITY, FILTER_TYPE_MIME_BY_ACTIVITY]
If filter_type is None, the default behavior of the
what_filter is applied (for backward compatibility),
this option is DEPRECATED.
If filter_type is FILTER_TYPE_GENERIC_MIME, the
what_filter should be a generic mime type defined in
mime.py; the object chooser will filter based in the
'mime_type' metadata field.
If filter_type is FILTER_TYPE_ACTIVITY, the what_filter
should by an activity bundle_id; the object chooser
will filter based in the 'activity' metadata field.
If filter_type is FILTER_TYPE_MIME_BY_ACTIVITY, the
what_filter should be an activity bundle_id; the object
chooser will filter based on the 'mime_type' metadata
field and the mime types defined by the activity in the
activity.info file.
show_preview -- boolean
if True will show the preview image asociated with
the object in the Journal. This option is only available
if filter_type is selected.
"""
if parent is None:
parent_xid = 0
elif hasattr(parent, 'get_window') and hasattr(parent.get_window(),
'get_xid'):
parent_xid = parent.get_window().get_xid()
else:
parent_xid = parent
self._parent_xid = parent_xid
self._show_preview = show_preview
self._main_loop = None
self._object_id = None
self._bus = None
self._chooser_id = None
self._response_code = Gtk.ResponseType.NONE
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self._what_filter = what_filter
if filter_type is not None:
# verify is one of the availables types
# add here more types if needed
if filter_type not in [FILTER_TYPE_MIME_BY_ACTIVITY,
FILTER_TYPE_GENERIC_MIME,
FILTER_TYPE_ACTIVITY]:
raise Exception('filter_type not implemented')
self._filter_type = filter_type
def run(self):
self._object_id = None
self._main_loop = GObject.MainLoop()
self._bus = dbus.SessionBus(mainloop=self._main_loop)
self._bus.add_signal_receiver(
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self.__name_owner_changed_cb,
signal_name='NameOwnerChanged',
dbus_interface='org.freedesktop.DBus',
arg0=J_DBUS_SERVICE)
obj = self._bus.get_object(J_DBUS_SERVICE, J_DBUS_PATH)
journal = dbus.Interface(obj, J_DBUS_INTERFACE)
journal.connect_to_signal('ObjectChooserResponse',
self.__chooser_response_cb)
journal.connect_to_signal('ObjectChooserCancelled',
self.__chooser_cancelled_cb)
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if self._what_filter is None:
what_filter = ''
else:
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what_filter = self._what_filter
if self._filter_type is None:
self._chooser_id = journal.ChooseObject(
self._parent_xid, what_filter)
else:
self._chooser_id = journal.ChooseObjectWithFilter(
self._parent_xid, what_filter, self._filter_type,
self._show_preview)
Gdk.threads_leave()
try:
self._main_loop.run()
finally:
Gdk.threads_enter()
self._main_loop = None
return self._response_code
def get_selected_object(self):
if self._object_id is None:
return None
else:
return datastore.get(self._object_id)
def destroy(self):
self._cleanup()
def _cleanup(self):
if self._main_loop is not None:
self._main_loop.quit()
self._main_loop = None
self._bus = None
def __chooser_response_cb(self, chooser_id, object_id):
if chooser_id != self._chooser_id:
return
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logging.debug('ObjectChooser.__chooser_response_cb: %r', object_id)
self._response_code = Gtk.ResponseType.ACCEPT
self._object_id = object_id
self._cleanup()
def __chooser_cancelled_cb(self, chooser_id):
if chooser_id != self._chooser_id:
return
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logging.debug('ObjectChooser.__chooser_cancelled_cb: %r', chooser_id)
self._response_code = Gtk.ResponseType.CANCEL
self._cleanup()
def __name_owner_changed_cb(self, name, old, new):
logging.debug('ObjectChooser.__name_owner_changed_cb')
# Journal service disappeared from the bus
self._response_code = Gtk.ResponseType.CANCEL
self._cleanup()