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284 lines
9.4 KiB
Python
284 lines
9.4 KiB
Python
# Copyright (C) 2007, One Laptop Per Child
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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"""
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STABLE.
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"""
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import six
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import logging
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import cairo
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from gi.repository import GObject
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from gi.repository import Gtk
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from gi.repository import Gdk
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import dbus
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from sugar3.datastore import datastore
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from sugar3.activity.activity import PREVIEW_SIZE
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J_DBUS_SERVICE = 'org.laptop.Journal'
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J_DBUS_INTERFACE = 'org.laptop.Journal'
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J_DBUS_PATH = '/org/laptop/Journal'
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FILTER_TYPE_MIME_BY_ACTIVITY = 'mime_by_activity'
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FILTER_TYPE_GENERIC_MIME = 'generic_mime'
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FILTER_TYPE_ACTIVITY = 'activity'
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def get_preview_pixbuf(preview_data, width=-1, height=-1):
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"""
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Retrive a pixbuf with the content of the preview field
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Args:
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metadata (dictionary): preview data from the metadata dictionary. Can't
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be None. Returned from the
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sugar3.datastore.datastore.DSObject.get_metadata() method.
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Keyword Args:
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width (int): the pixbuf width, if is not set, the default width will be used
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height (int): the pixbuf width, if is not set, the default height will be used
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Returns:
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Pixbuf, the generated Pixbuf
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None, if it could not be created
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Example:
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pixbuf = get_preview_pixbuf(metadata.get('preview', ''))
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has_preview = pixbuf is not None
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if has_preview:
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im = Gtk.Image()
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im.set_from_pixbuf(pixbuf)
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box.add(im)
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im.show()
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"""
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if width == -1:
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width = PREVIEW_SIZE[0]
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if height == -1:
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height = PREVIEW_SIZE[1]
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pixbuf = None
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if len(preview_data) > 4:
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if preview_data[1:4] != 'PNG':
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# TODO: We are close to be able to drop this.
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import base64
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preview_data = base64.b64decode(preview_data)
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png_file = six.StringIO(preview_data)
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try:
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# Load image and scale to dimensions
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surface = cairo.ImageSurface.create_from_png(png_file)
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png_width = surface.get_width()
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png_height = surface.get_height()
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preview_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32,
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width, height)
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cr = cairo.Context(preview_surface)
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scale_w = width * 1.0 / png_width
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scale_h = height * 1.0 / png_height
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scale = min(scale_w, scale_h)
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cr.scale(scale, scale)
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cr.set_source_rgba(1, 1, 1, 0)
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cr.set_operator(cairo.OPERATOR_SOURCE)
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cr.paint()
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cr.set_source_surface(surface)
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cr.paint()
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pixbuf = Gdk.pixbuf_get_from_surface(preview_surface, 0, 0,
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width, height)
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except Exception:
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logging.exception('Error while loading the preview')
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return pixbuf
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class ObjectChooser(object):
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"""
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UI interface for object choosers.
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Object choosers can be used by acivities to allow the user to select objects
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from the file system or from some other similar source.
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Keyword Args:
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parent (:class:`Gtk.Widget`): the widget calling ObjectChooser
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what_filter (str): an activity bundle_id or a generic mime type as
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defined in :mod:`sugar3.mime` used to determine which objects
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will be presented in the object chooser
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filter_type (str): should be one of [None, FILTER_TYPE_GENERIC_MIME,
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FILTER_TYPE_ACTIVITY, FILTER_TYPE_MIME_BY_ACTIVITY]
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If filter_type is None, the default behavior of the
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what_filter is applied (for backward compatibility),
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this option is DEPRECATED.
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If filter_type is FILTER_TYPE_GENERIC_MIME, the
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what_filter should be a generic mime type defined in
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mime.py; the object chooser will filter based in the
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'mime_type' metadata field.
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If filter_type is FILTER_TYPE_ACTIVITY, the what_filter
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should by an activity bundle_id; the object chooser
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will filter based in the 'activity' metadata field.
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If filter_type is FILTER_TYPE_MIME_BY_ACTIVITY, the
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what_filter should be an activity bundle_id; the object
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chooser will filter based on the 'mime_type' metadata
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field and the mime types defined by the activity in the
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activity.info file.
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show_preview (bool): if True will show the preview image asociated with
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the object in the Journal. This option is only available if
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filter_type is selected.
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Examples:
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chooser = ObjectChooser(self._activity, what_filter='Image')
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chooser = ObjectChooser(parent=self,
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what_filter=self.get_bundle_id(),
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filter_type=FILTER_TYPE_ACTIVITY)
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"""
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def __init__(self, parent=None, what_filter=None, filter_type=None,
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show_preview=False):
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if parent is None:
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parent_xid = 0
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elif hasattr(parent, 'get_window') and hasattr(parent.get_window(),
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'get_xid'):
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parent_xid = parent.get_window().get_xid()
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else:
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parent_xid = parent
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self._parent_xid = parent_xid
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self._show_preview = show_preview
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self._main_loop = None
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self._object_id = None
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self._bus = None
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self._chooser_id = None
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self._response_code = Gtk.ResponseType.NONE
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self._what_filter = what_filter
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if filter_type is not None:
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# verify is one of the availables types
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# add here more types if needed
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if filter_type not in [FILTER_TYPE_MIME_BY_ACTIVITY,
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FILTER_TYPE_GENERIC_MIME,
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FILTER_TYPE_ACTIVITY]:
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raise Exception('filter_type not implemented')
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self._filter_type = filter_type
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def run(self):
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"""
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Runs the object chooser and displays it.
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Returns:
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Gtk.ResponseType constant, the response received from displaying the
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object chooser.
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"""
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self._object_id = None
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self._main_loop = GObject.MainLoop()
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self._bus = dbus.SessionBus(mainloop=self._main_loop)
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self._bus.add_signal_receiver(
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self.__name_owner_changed_cb,
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signal_name='NameOwnerChanged',
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dbus_interface='org.freedesktop.DBus',
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arg0=J_DBUS_SERVICE)
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obj = self._bus.get_object(J_DBUS_SERVICE, J_DBUS_PATH)
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journal = dbus.Interface(obj, J_DBUS_INTERFACE)
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journal.connect_to_signal('ObjectChooserResponse',
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self.__chooser_response_cb)
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journal.connect_to_signal('ObjectChooserCancelled',
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self.__chooser_cancelled_cb)
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if self._what_filter is None:
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what_filter = ''
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else:
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what_filter = self._what_filter
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if self._filter_type is None:
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self._chooser_id = journal.ChooseObject(
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self._parent_xid, what_filter)
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else:
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self._chooser_id = journal.ChooseObjectWithFilter(
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self._parent_xid, what_filter, self._filter_type,
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self._show_preview)
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Gdk.threads_leave()
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try:
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self._main_loop.run()
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finally:
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Gdk.threads_enter()
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self._main_loop = None
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return self._response_code
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def get_selected_object(self):
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"""
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Gets the object selected using the object chooser.
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Returns:
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object, the object selected
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"""
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if self._object_id is None:
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return None
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else:
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return datastore.get(self._object_id)
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def destroy(self):
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"""
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Destroys and cleans up (disposes) the object chooser.
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"""
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self._cleanup()
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def _cleanup(self):
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if self._main_loop is not None:
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self._main_loop.quit()
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self._main_loop = None
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self._bus = None
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def __chooser_response_cb(self, chooser_id, object_id):
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if chooser_id != self._chooser_id:
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return
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logging.debug('ObjectChooser.__chooser_response_cb: %r' % object_id)
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self._response_code = Gtk.ResponseType.ACCEPT
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self._object_id = object_id
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self._cleanup()
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def __chooser_cancelled_cb(self, chooser_id):
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if chooser_id != self._chooser_id:
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return
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logging.debug('ObjectChooser.__chooser_cancelled_cb: %r' % chooser_id)
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self._response_code = Gtk.ResponseType.CANCEL
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self._cleanup()
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def __name_owner_changed_cb(self, name, old, new):
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logging.debug('ObjectChooser.__name_owner_changed_cb')
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# Journal service disappeared from the bus
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self._response_code = Gtk.ResponseType.CANCEL
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self._cleanup()
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