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
|
#
# Copyright (c) 2002, 2004, 2005 Art Haas
#
# This file is part of PythonCAD.
#
# PythonCAD 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.
#
# PythonCAD 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 PythonCAD; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#
# a class for storing selected objects
#
from PythonCAD.Generic import entity
class Selection(object):
"""A class used for storing selected objects.
A Selection object has the following methods:
storeObject(): Store a reference to some object.
getObjects(): Return all the objects held within the Selection object.
reset(): Empty the Selection object.
A Selection can have any number of objects added to it, and the
contents of a Selection can be retrieved any number of times.
Once the Selection has had its contents retrieved, however,
the addition of a new object will purge the current contents
of the selection.
"""
def __init__(self):
"""Initialize a Selection object.
There are no arguments needed for this method.
"""
self.__image = None
self.__objs = []
self.__retrieved = False
def hasObjects(self):
"""Test if there are objects stored in the Selection.
hasObjects()
"""
return len(self.__objs) > 0
def storeObject(self, obj):
"""Store a reference to an object.
storeObject(obj)
Argument 'obj' can be an instance of the Entity class.
"""
if not isinstance(obj, entity.Entity):
raise TypeError, "Invalid object: " + `type(obj)`
_layer = obj.getParent()
if _layer is None:
raise ValueError, "Object parent is None"
_image = _layer.getParent()
if _image is None:
raise ValueError, "Object not stored in an Image"
if (self.__retrieved or
(self.__image is not None and _image is not self.__image)):
self.reset()
self.__image = _image
_seen = False
for _obj in self.__objs:
if _obj is obj:
_seen = True
break
if not _seen:
self.__objs.append(obj)
def getObjects(self):
"""Return all the currently selected objects.
getObjects()
This method returns a list.
"""
self.__retrieved = True
return self.__objs[:]
def reset(self):
"""Reset the Selection object to empty.
reset()
"""
self.__image = None
del self.__objs[:]
self.__retrieved = False
|
