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231 lines
8.8 KiB
Python
231 lines
8.8 KiB
Python
"""UI class to access system-level clipboard object"""
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# 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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import logging
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import dbus
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import gobject
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NAME_KEY = 'NAME'
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PERCENT_KEY = 'PERCENT'
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ICON_KEY = 'ICON'
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PREVIEW_KEY = 'PREVIEW'
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ACTIVITIES_KEY = 'ACTIVITIES'
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FORMATS_KEY = 'FORMATS'
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TYPE_KEY = 'TYPE'
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DATA_KEY = 'DATA'
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ON_DISK_KEY = 'ON_DISK'
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DBUS_SERVICE = "org.laptop.Clipboard"
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DBUS_INTERFACE = "org.laptop.Clipboard"
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DBUS_PATH = "/org/laptop/Clipboard"
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class ClipboardService(gobject.GObject):
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"""GUI interfaces for the system clipboard dbus service
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This object is used to provide convenient access to the clipboard
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service (see source/services/clipboard/clipboardservice.py). It
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provides utility methods for adding/getting/removing objects from
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the clipboard as well as generating events when such events occur.
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Meaning is source/services/clipboard/clipboardobject.py
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objects when describing "objects" on the clipboard.
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"""
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__gsignals__ = {
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'object-added': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([str, str])),
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'object-deleted': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([str])),
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'object-state-changed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([str, str, int, str, str, object])),
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}
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def __init__(self):
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"""Initialise the ClipboardService instance
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If the service is not yet active in the background uses
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a signal watcher to connect when the service appears.
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"""
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gobject.GObject.__init__(self)
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self._dbus_service = None
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bus = dbus.SessionBus()
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self._nameOwnerChangedHandler = 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=DBUS_SERVICE)
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self._connected = False
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# Try to register to ClipboardService, if we fail, we'll try later.
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try:
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self._connect_clipboard_signals()
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except dbus.DBusException, exception:
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logging.debug(exception)
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def _connect_clipboard_signals(self):
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"""Connect dbus signals to our GObject signal generating callbacks"""
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bus = dbus.SessionBus()
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if not self._connected:
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# NOTE: We need to follow_name_owner_changes here
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# because we can not connect to a signal unless
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# we follow the changes or we start the service
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# before we connect. Starting the service here
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# causes a major bottleneck during startup
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proxy_obj = bus.get_object(DBUS_SERVICE,
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DBUS_PATH,
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follow_name_owner_changes=True)
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self._dbus_service = dbus.Interface(proxy_obj, DBUS_SERVICE)
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self._dbus_service.connect_to_signal('object_added',
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self._object_added_cb)
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self._dbus_service.connect_to_signal('object_deleted',
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self._object_deleted_cb)
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self._dbus_service.connect_to_signal('object_state_changed',
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self._object_state_changed_cb)
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self._connected = True
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bus.remove_signal_receiver(self._nameOwnerChangedHandler)
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def _name_owner_changed_cb(self, name, old, new):
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"""On backend service creation, connect to the server"""
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if not old and new:
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# ClipboardService started up
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self._connect_clipboard_signals()
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def _object_added_cb(self, object_id, name):
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"""Emit an object-added GObject event when dbus event arrives"""
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self.emit('object-added', str(object_id), name)
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def _object_deleted_cb(self, object_id):
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"""Emit an object-deleted GObject event when dbus event arrives"""
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self.emit('object-deleted', str(object_id))
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def _object_state_changed_cb(self, object_id, values):
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"""Emit an object-state-changed GObject event when dbus event arrives
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GObject event has:
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object_id
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name
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percent
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icon
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preview
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activities
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From the ClipboardObject instance which is being described.
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"""
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self.emit('object-state-changed', str(object_id), values[NAME_KEY],
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values[PERCENT_KEY], values[ICON_KEY], values[PREVIEW_KEY],
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values[ACTIVITIES_KEY])
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def add_object(self, name):
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"""Add a new object to the path
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returns dbus path-name for the new object's cliboard service,
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this is used for all future references to the cliboard object.
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Note:
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That service is actually provided by the clipboard
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service object, not the ClipboardObject
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"""
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return str(self._dbus_service.add_object(name))
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def add_object_format(self, object_id, formatType, data, on_disk):
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"""Annotate given object on the clipboard with new information
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object_id -- dbus path as returned from add_object
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formatType -- XXX what should this be? mime type?
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data -- storage format for the clipped object?
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on_disk -- whether the data is on-disk (non-volatile) or in
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memory (volatile)
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Last three arguments are just passed directly to the
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clipboardobject.Format instance on the server side.
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returns None
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"""
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self._dbus_service.add_object_format(dbus.ObjectPath(object_id),
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formatType,
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data,
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on_disk)
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def delete_object(self, object_id):
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"""Remove the given object from the clipboard
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object_id -- dbus path as returned from add_object
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"""
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self._dbus_service.delete_object(dbus.ObjectPath(object_id))
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def set_object_percent(self, object_id, percent):
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"""Set the "percentage" for the given clipboard object
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object_id -- dbus path as returned from add_object
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percentage -- numeric value from 0 to 100 inclusive
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Object percentages which are set to 100% trigger "file-completed"
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operations, see the backend ClipboardService's
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_handle_file_completed method for details.
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returns None
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"""
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self._dbus_service.set_object_percent(
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dbus.ObjectPath(object_id), percent)
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def get_object(self, object_id):
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"""Retrieve the clipboard object structure for given object
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object_id -- dbus path as returned from add_object
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Retrieves the metadata description of a given object, but
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*not* the data for the object. Use get_object_data passing
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one of the values in the FORMATS_KEY value in order to
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retrieve the data.
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returns dictionary with
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NAME_KEY: str,
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PERCENT_KEY: number,
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ICON_KEY: str,
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PREVIEW_KEY: XXX what is it?,
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ACTIVITIES_KEY: activities that can open this object,
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FORMATS_KEY: list of XXX what is it?
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"""
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return self._dbus_service.get_object(dbus.ObjectPath(object_id),)
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def get_object_data(self, object_id, formatType):
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"""Retrieve object's data in the given formatType
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object_id -- dbus path as returned from add_object
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formatType -- format specifier XXX of what description
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returns dictionary with
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TYPE_KEY: str,
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DATA_KEY: str,
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ON_DISK_KEY: bool
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"""
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return self._dbus_service.get_object_data(dbus.ObjectPath(object_id),
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formatType,
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byte_arrays=True)
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_clipboard_service = None
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def get_instance():
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"""Retrieve this process's interface to the clipboard service"""
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global _clipboard_service
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if not _clipboard_service:
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_clipboard_service = ClipboardService()
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return _clipboard_service
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