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#
# Copyright (c) 2002, 2004 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 image
from PythonCAD.Generic import layer
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.__layers = {}
self.__retrieved = False
def hasObjects(self):
"""Test if there are objects stored in the Selection.
hasObjects()
"""
_val = False
if len(self.__layers):
for _lid in self.__layers:
if len(self.__layers[_lid]) > 0:
_val = True
break
return _val
def storeObject(self, img, lyr, obj):
"""Store a reference to an object.
storeObject(img, lyr, obj)
The arguments are:
img: An Image object.
lyr: A Layer object.
obj: An object in the drawing (Point, Segment, etc.)
"""
if not isinstance(img, image.Image):
raise TypeError, "Invalid image object: " + `img`
if not isinstance(lyr, layer.Layer):
raise TypeError, "Invalid layer object: " + `lyr`
if (self.__retrieved or
(self.__image is not None and img is not self.__image)):
self.reset()
self.__image = img
_lid = id(lyr)
_objlist = self.__layers.setdefault(_lid, [])
_seen = False
for _i in range(len(_objlist)):
if obj is _objlist[_i]:
_seen = True
break
if not _seen:
_objlist.append(obj)
def getObjects(self):
"""Return all the currently selected objects.
getObjects()
This method returns a list.
"""
_allobjs = []
for _lid in self.__layers:
_allobjs.extend(self.__layers[_lid][:])
self.__retrieved = True
return _allobjs
def reset(self):
"""Reset the Selection object to empty.
reset()
"""
self.__image = None
self.__layers.clear()
self.__retrieved = False
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