/usr/lib/python3/dist-packages/pygtkcompat/generictreemodel.py is in python3-gi 3.14.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 | # -*- Mode: Python; py-indent-offset: 4 -*-
# generictreemodel - GenericTreeModel implementation for pygtk compatibility.
# Copyright (C) 2013 Simon Feltman
#
# generictreemodel.py: GenericTreeModel implementation for pygtk compatibility
#
# 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, see <http://www.gnu.org/licenses/>.
# System
import sys
import random
import collections
import ctypes
# GObject
from gi.repository import GObject
from gi.repository import Gtk
class _CTreeIter(ctypes.Structure):
_fields_ = [('stamp', ctypes.c_int),
('user_data', ctypes.c_void_p),
('user_data2', ctypes.c_void_p),
('user_data3', ctypes.c_void_p)]
@classmethod
def from_iter(cls, iter):
offset = sys.getsizeof(object()) # size of PyObject_HEAD
return ctypes.POINTER(cls).from_address(id(iter) + offset)
def _get_user_data_as_pyobject(iter):
citer = _CTreeIter.from_iter(iter)
return ctypes.cast(citer.contents.user_data, ctypes.py_object).value
def handle_exception(default_return):
"""Returns a function which can act as a decorator for wrapping exceptions and
returning "default_return" upon an exception being thrown.
This is used to wrap Gtk.TreeModel "do_" method implementations so we can return
a proper value from the override upon an exception occurring with client code
implemented by the "on_" methods.
"""
def decorator(func):
def wrapped_func(*args, **kargs):
try:
return func(*args, **kargs)
except:
# Use excepthook directly to avoid any printing to the screen
# if someone installed an except hook.
sys.excepthook(*sys.exc_info())
return default_return
return wrapped_func
return decorator
class GenericTreeModel(GObject.GObject, Gtk.TreeModel):
"""A base implementation of a Gtk.TreeModel for python.
The GenericTreeModel eases implementing the Gtk.TreeModel interface in Python.
The class can be subclassed to provide a TreeModel implementation which works
directly with Python objects instead of iterators.
All of the on_* methods should be overridden by subclasses to provide the
underlying implementation a way to access custom model data. For the purposes of
this API, all custom model data supplied or handed back through the overridable
API will use the argument names: node, parent, and child in regards to user data
python objects.
The create_tree_iter, set_user_data, invalidate_iters, iter_is_valid methods are
available to help manage Gtk.TreeIter objects and their Python object references.
GenericTreeModel manages a pool of user data nodes that have been used with iters.
This pool stores a references to user data nodes as a dictionary value with the
key being the integer id of the data. This id is what the Gtk.TreeIter objects
use to reference data in the pool.
References will be removed from the pool when the model is deleted or explicitly
by using the optional "node" argument to the "row_deleted" method when notifying
the model of row deletion.
"""
leak_references = GObject.Property(default=True, type=bool,
blurb="If True, strong references to user data attached to iters are "
"stored in a dictionary pool (default). Otherwise the user data is "
"stored as a raw pointer to a python object without a reference.")
#
# Methods
#
def __init__(self):
"""Initialize. Make sure to call this from derived classes if overridden."""
super(GenericTreeModel, self).__init__()
self.stamp = 0
#: Dictionary of (id(user_data): user_data), used when leak-refernces=False
self._held_refs = dict()
# Set initial stamp
self.invalidate_iters()
def iter_depth_first(self):
"""Depth-first iteration of the entire TreeModel yielding the python nodes."""
stack = collections.deque([None])
while stack:
it = stack.popleft()
if it is not None:
yield self.get_user_data(it)
children = [self.iter_nth_child(it, i) for i in range(self.iter_n_children(it))]
stack.extendleft(reversed(children))
def invalidate_iter(self, iter):
"""Clear user data and its reference from the iter and this model."""
iter.stamp = 0
if iter.user_data:
if iter.user_data in self._held_refs:
del self._held_refs[iter.user_data]
iter.user_data = None
def invalidate_iters(self):
"""
This method invalidates all TreeIter objects associated with this custom tree model
and frees their locally pooled references.
"""
self.stamp = random.randint(-2147483648, 2147483647)
self._held_refs.clear()
def iter_is_valid(self, iter):
"""
:Returns:
True if the gtk.TreeIter specified by iter is valid for the custom tree model.
"""
return iter.stamp == self.stamp
def get_user_data(self, iter):
"""Get the user_data associated with the given TreeIter.
GenericTreeModel stores arbitrary Python objects mapped to instances of Gtk.TreeIter.
This method allows to retrieve the Python object held by the given iterator.
"""
if self.leak_references:
return self._held_refs[iter.user_data]
else:
return _get_user_data_as_pyobject(iter)
def set_user_data(self, iter, user_data):
"""Applies user_data and stamp to the given iter.
If the models "leak_references" property is set, a reference to the
user_data is stored with the model to ensure we don't run into bad
memory problems with the TreeIter.
"""
iter.user_data = id(user_data)
if user_data is None:
self.invalidate_iter(iter)
else:
iter.stamp = self.stamp
if self.leak_references:
self._held_refs[iter.user_data] = user_data
def create_tree_iter(self, user_data):
"""Create a Gtk.TreeIter instance with the given user_data specific for this model.
Use this method to create Gtk.TreeIter instance instead of directly calling
Gtk.Treeiter(), this will ensure proper reference managment of wrapped used_data.
"""
iter = Gtk.TreeIter()
self.set_user_data(iter, user_data)
return iter
def _create_tree_iter(self, data):
"""Internal creation of a (bool, TreeIter) pair for returning directly
back to the view interfacing with this model."""
if data is None:
return (False, None)
else:
it = self.create_tree_iter(data)
return (True, it)
def row_deleted(self, path, node=None):
"""Notify the model a row has been deleted.
Use the node parameter to ensure the user_data reference associated
with the path is properly freed by this model.
:Parameters:
path : Gtk.TreePath
Path to the row that has been deleted.
node : object
Python object used as the node returned from "on_get_iter". This is
optional but ensures the model will not leak references to this object.
"""
super(GenericTreeModel, self).row_deleted(path)
node_id = id(node)
if node_id in self._held_refs:
del self._held_refs[node_id]
#
# GtkTreeModel Interface Implementation
#
@handle_exception(0)
def do_get_flags(self):
"""Internal method."""
return self.on_get_flags()
@handle_exception(0)
def do_get_n_columns(self):
"""Internal method."""
return self.on_get_n_columns()
@handle_exception(GObject.TYPE_INVALID)
def do_get_column_type(self, index):
"""Internal method."""
return self.on_get_column_type(index)
@handle_exception((False, None))
def do_get_iter(self, path):
"""Internal method."""
return self._create_tree_iter(self.on_get_iter(path))
@handle_exception(False)
def do_iter_next(self, iter):
"""Internal method."""
if iter is None:
next_data = self.on_iter_next(None)
else:
next_data = self.on_iter_next(self.get_user_data(iter))
self.set_user_data(iter, next_data)
return next_data is not None
@handle_exception(None)
def do_get_path(self, iter):
"""Internal method."""
path = self.on_get_path(self.get_user_data(iter))
if path is None:
return None
else:
return Gtk.TreePath(path)
@handle_exception(None)
def do_get_value(self, iter, column):
"""Internal method."""
return self.on_get_value(self.get_user_data(iter), column)
@handle_exception((False, None))
def do_iter_children(self, parent):
"""Internal method."""
data = self.get_user_data(parent) if parent else None
return self._create_tree_iter(self.on_iter_children(data))
@handle_exception(False)
def do_iter_has_child(self, parent):
"""Internal method."""
return self.on_iter_has_child(self.get_user_data(parent))
@handle_exception(0)
def do_iter_n_children(self, iter):
"""Internal method."""
if iter is None:
return self.on_iter_n_children(None)
return self.on_iter_n_children(self.get_user_data(iter))
@handle_exception((False, None))
def do_iter_nth_child(self, parent, n):
"""Internal method."""
if parent is None:
data = self.on_iter_nth_child(None, n)
else:
data = self.on_iter_nth_child(self.get_user_data(parent), n)
return self._create_tree_iter(data)
@handle_exception((False, None))
def do_iter_parent(self, child):
"""Internal method."""
return self._create_tree_iter(self.on_iter_parent(self.get_user_data(child)))
@handle_exception(None)
def do_ref_node(self, iter):
self.on_ref_node(self.get_user_data(iter))
@handle_exception(None)
def do_unref_node(self, iter):
self.on_unref_node(self.get_user_data(iter))
#
# Python Subclass Overridables
#
def on_get_flags(self):
"""Overridable.
:Returns Gtk.TreeModelFlags:
The flags for this model. See: Gtk.TreeModelFlags
"""
raise NotImplementedError
def on_get_n_columns(self):
"""Overridable.
:Returns:
The number of columns for this model.
"""
raise NotImplementedError
def on_get_column_type(self, index):
"""Overridable.
:Returns:
The column type for the given index.
"""
raise NotImplementedError
def on_get_iter(self, path):
"""Overridable.
:Returns:
A python object (node) for the given TreePath.
"""
raise NotImplementedError
def on_iter_next(self, node):
"""Overridable.
:Parameters:
node : object
Node at current level.
:Returns:
A python object (node) following the given node at the current level.
"""
raise NotImplementedError
def on_get_path(self, node):
"""Overridable.
:Returns:
A TreePath for the given node.
"""
raise NotImplementedError
def on_get_value(self, node, column):
"""Overridable.
:Parameters:
node : object
column : int
Column index to get the value from.
:Returns:
The value of the column for the given node."""
raise NotImplementedError
def on_iter_children(self, parent):
"""Overridable.
:Returns:
The first child of parent or None if parent has no children.
If parent is None, return the first node of the model.
"""
raise NotImplementedError
def on_iter_has_child(self, node):
"""Overridable.
:Returns:
True if the given node has children.
"""
raise NotImplementedError
def on_iter_n_children(self, node):
"""Overridable.
:Returns:
The number of children for the given node. If node is None,
return the number of top level nodes.
"""
raise NotImplementedError
def on_iter_nth_child(self, parent, n):
"""Overridable.
:Parameters:
parent : object
n : int
Index of child within parent.
:Returns:
The child for the given parent index starting at 0. If parent None,
return the top level node corresponding to "n".
If "n" is larger then available nodes, return None.
"""
raise NotImplementedError
def on_iter_parent(self, child):
"""Overridable.
:Returns:
The parent node of child or None if child is a top level node."""
raise NotImplementedError
def on_ref_node(self, node):
pass
def on_unref_node(self, node):
pass
|