Show DdTargets.py syntax highlighted
# -*- python -*-
# -*- coding: utf-8 -*-
#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2000-2005 Donald N. Allingham
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# $Id: DdTargets.py 8713 2007-07-12 04:24:44Z dallingham $
"""
This module provides management of all the drag and drop target information
required by gramps widgets.
Adding a new drag and drop target.
==================================
To add a new target: add a new _DdType to in _DdTargets.__init__ and
then add this new type to the list returned from either all_text_types()
and all_text_targets() or or all_gramps_targets() and all_gramps_types().
Usage
=====
The module defines a singleton instance of _DdTargets called DdTargets.
from DdTargets import DdTargets
drag_dest_set(gtk.DEST_DEFAULT_ALL,
DdTargets.all_targets(),
ACTION_COPY)
"""
#-------------------------------------------------------------------------
#
# set up logging
#
#-------------------------------------------------------------------------
import logging
log = logging.getLogger(".DdTargets")
class _DdType:
"""Represents the fields needed by a drag and drop traget."""
_APP_ID_OFFSET = 40 # Starting value of app_ids
def __init__(self, container, drag_type, target_flags=0, app_id=None):
"""Create a new DdType:
drag_type: string holding the name of the type.
target_flags: int value that will be passed to drop target.
app_id: integer target id passed to drop target.
"""
self.drag_type = drag_type
self.target_flags = target_flags
self.app_id = app_id or self._calculate_id()
container.insert(self)
def _calculate_id(self):
"""return the next available app_id."""
idval = _DdType._APP_ID_OFFSET
_DdType._APP_ID_OFFSET += 1
return idval
def target(self):
"""return the full target information in the format
required by the Gtk functions."""
return (self.drag_type, self.target_flags, self.app_id)
class _DdTargets(object):
"""A single class that manages all the drag and drop targets."""
_instance = None # Singleton instance
def __new__(cls):
"""Ensure that we never have more than one instance."""
if _DdTargets._instance:
return _DdTargets._instance
_DdTargets._instance = object.__new__(cls)
return _DdTargets._instance
def __init__(self):
"""Set up the drag and drop targets."""
self._type_map = {}
self._app_id_map = {}
self.URL = _DdType(self, 'url')
self.EVENT = _DdType(self, 'pevent')
self.EVENTREF = _DdType(self, 'eventref')
self.ATTRIBUTE = _DdType(self, 'pattr')
self.ADDRESS = _DdType(self, 'paddr')
self.LOCATION = _DdType(self, 'location')
self.SOURCEREF = _DdType(self, 'srcref')
self.REPOREF = _DdType(self, 'reporef')
self.REPO_LINK = _DdType(self, 'repo-link')
self.PLACE_LINK = _DdType(self, 'place-link')
self.NAME = _DdType(self, 'name')
self.MEDIAOBJ = _DdType(self, 'mediaobj')
self.MEDIAREF = _DdType(self, 'mediaref')
self.DATA = _DdType(self, 'data_tuple')
self.NOTE_LINK = _DdType(self, 'note-link')
self.PERSON_LINK = _DdType(self, 'person-link')
self.PERSON_LINK_LIST = _DdType(self, 'person-link-list')
self.PERSONREF = _DdType(self, 'personref')
self.SOURCE_LINK = _DdType(self, 'source-link')
self.FAMILY_EVENT = _DdType(self, 'fevent')
self.FAMILY_ATTRIBUTE = _DdType(self, 'fattr')
# List of all types that are used between
# gramps widgets but should not be exported
# to non gramps widgets.
self._all_gramps_types = [
self.URL,
self.EVENT,
self.ATTRIBUTE,
self.ADDRESS,
self.LOCATION,
self.SOURCEREF,
self.EVENTREF,
self.NAME,
self.REPOREF,
self.MEDIAOBJ,
self.MEDIAREF,
self.REPO_LINK,
self.PLACE_LINK,
self.SOURCE_LINK,
self.PERSON_LINK,
self.PERSON_LINK_LIST,
self.PERSONREF,
self.NOTE_LINK,
]
self.CHILD = _DdType(self, 'child')
self.SPOUSE = _DdType(self, 'spouse')
self.TEXT = _DdType(self, 'TEXT', 0, 1)
self.TEXT_MIME = _DdType(self, 'text/plain', 0, 0)
self.STRING = _DdType(self, 'STRING', 0, 2)
self.COMPOUND_TEXT = _DdType(self, 'COMPOUND_TEXT', 0, 3)
self.UTF8_STRING = _DdType(self, 'UTF8_STRING', 0, 4)
self.URI_LIST = _DdType(self, 'text/uri-list', 0, 5)
self.APP_ROOT = _DdType(self, 'application/x-rootwin-drop', 0, 6)
# List of all the test types. These are types
# that can be interpreted as text.
self._all_text_types = (self.UTF8_STRING,
self.TEXT,
self.TEXT_MIME,
self.STRING,
self.COMPOUND_TEXT)
def insert(self, dd_type):
"""Add a target to the lookup lists. These lists are
used purely for performance reasons."""
self._type_map[dd_type.drag_type] = dd_type
self._app_id_map[dd_type.app_id] = dd_type
def get_dd_type_from_type_name(self, type_name):
return self._type_map.get(type_name, None)
def get_dd_type_from_app_id(self, app_id):
return self._app_id_map.get(app_id, None)
def is_text_type(self, type_name):
return type_name in self.all_text_types()
def all_text(self):
return self._all_text_types
def all_text_types(self):
"""return a list of all the type names that could be
used as the type of a string."""
return tuple([t.drag_type for t in self._all_text_types])
def is_gramps_type(self, type_name):
return type_name in self.all_gramps_types()
def all_gramps_types(self):
"""return a list of all the type names that are internal
to gramps."""
return tuple([t.drag_type for t in self._all_gramps_types])
def all_text_targets(self):
"""return a list of all the targets that could be used
for text."""
return tuple([t.target() for t in self._all_text_types])
def all_gramps_targets(self):
"""return a list off the internal gramps targets."""
return tuple([t.target() for t in self._all_gramps_types])
def all_targets(self):
"""return a list of all the known targets."""
return self.all_gramps_targets() + self.all_text_targets()
# Create the singleton instance.
DdTargets = _DdTargets()
#
# Below here is test code.
#
if __name__ == "__main__":
print repr(DdTargets.all_text_types())
print repr(DdTargets.URL)
print DdTargets.is_gramps_type('pevent')
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