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Commit578efde

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Cleanup _pylab_helpers.
_activeQue + figs can be combined into a single OrderedDict.
1 parent684a1ea commit578efde

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1 file changed

+51
-64
lines changed

1 file changed

+51
-64
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‎lib/matplotlib/_pylab_helpers.py

Lines changed: 51 additions & 64 deletions
Original file line numberDiff line numberDiff line change
@@ -1,37 +1,41 @@
11
"""
2-
Manage figures for pyplot interface.
2+
Manage figures forthepyplot interface.
33
"""
44

55
importatexit
6+
fromcollectionsimportOrderedDict
67
importgc
78

89

9-
classGcf(object):
10+
classGcf:
1011
"""
11-
Singleton to manage a set of integer-numbered figures.
12-
13-
This class is never instantiated; it consists of two class
14-
attributes (a list and a dictionary), and a set of static
15-
methods that operate on those attributes, accessing them
16-
directly as class attributes.
17-
18-
Attributes:
19-
20-
*figs*:
21-
dictionary of the form {*num*: *manager*, ...}
22-
23-
*_activeQue*:
24-
list of *managers*, with active one at the end
25-
12+
Singleton to maintain the relation between figures and their managers, and
13+
keep track of and "active" figure and manager.
14+
15+
The canvas of a figure created through pyplot is associated with a figure
16+
manager, which handles the interaction between the figure and the backend.
17+
pyplot keeps track of figure managers using an identifier, the "figure
18+
number" or "manager number" (which can actually be any hashable value);
19+
this number is available as the :attr:`number` attribute of the manager.
20+
21+
This class is never instantiated; it consists of an `OrderedDict` mapping
22+
figure/manager numbers to managers, and a set of class methods that
23+
manipulate this `OrderedDict`.
24+
25+
Attributes
26+
----------
27+
figs : OrderedDict
28+
`OrderedDict` mapping numbers to managers; the active manager is at the
29+
end.
2630
"""
27-
_activeQue= []
28-
figs={}
31+
32+
figs=OrderedDict()
2933

3034
@classmethod
3135
defget_fig_manager(cls,num):
3236
"""
33-
Iffiguremanager *num* exists, make it the active
34-
figure and return the manager;otherwise return *None*.
37+
If managernumber*num* exists, make it the active one and return it;
38+
otherwise return *None*.
3539
"""
3640
manager=cls.figs.get(num,None)
3741
ifmanagerisnotNone:
@@ -41,90 +45,73 @@ def get_fig_manager(cls, num):
4145
@classmethod
4246
defdestroy(cls,num):
4347
"""
44-
Try to remove all traces offigure *num*.
48+
Destroyfigure number *num*.
4549
46-
In the interactive backends, this is bound to the
47-
window "destroy" and"delete" events.
50+
In the interactive backends, this is bound to the window "destroy" and
51+
"delete" events.
4852
"""
4953
ifnotcls.has_fignum(num):
5054
return
51-
manager=cls.figs[num]
55+
manager=cls.figs.pop(num)
5256
manager.canvas.mpl_disconnect(manager._cidgcf)
53-
cls._activeQue.remove(manager)
54-
delcls.figs[num]
5557
manager.destroy()
5658
gc.collect(1)
5759

5860
@classmethod
5961
defdestroy_fig(cls,fig):
60-
"*fig* is a Figure instance"
61-
num=next((manager.numformanagerincls.figs.values()
62-
ifmanager.canvas.figure==fig),None)
63-
ifnumisnotNone:
64-
cls.destroy(num)
62+
"""Destroy figure*fig*."""
63+
canvas=getattr(fig,"canvas",None)
64+
manager=getattr(canvas,"manager",None)
65+
num=getattr(manager,"num",None)
66+
cls.destroy(num)
6567

6668
@classmethod
6769
defdestroy_all(cls):
68-
# this is need to ensure that gc is available in corner cases
69-
# where modules are being torn down after install with easy_install
70-
importgc# noqa
70+
"""Destroy all figures."""
71+
# Reimport gc in case the module globals have already been removed
72+
# during interpreter shutdown.
73+
importgc
7174
formanagerinlist(cls.figs.values()):
7275
manager.canvas.mpl_disconnect(manager._cidgcf)
7376
manager.destroy()
74-
75-
cls._activeQue= []
7677
cls.figs.clear()
7778
gc.collect(1)
7879

7980
@classmethod
8081
defhas_fignum(cls,num):
81-
"""
82-
Return *True* if figure *num* exists.
83-
"""
82+
"""Return whether figure number *num* exists."""
8483
returnnumincls.figs
8584

8685
@classmethod
8786
defget_all_fig_managers(cls):
88-
"""
89-
Return a list of figure managers.
90-
"""
87+
"""Return a list of figure managers."""
9188
returnlist(cls.figs.values())
9289

9390
@classmethod
9491
defget_num_fig_managers(cls):
95-
"""
96-
Return the number of figures being managed.
97-
"""
92+
"""Return the number of figures being managed."""
9893
returnlen(cls.figs)
9994

10095
@classmethod
10196
defget_active(cls):
102-
"""
103-
Return the manager of the active figure, or *None*.
104-
"""
105-
iflen(cls._activeQue)==0:
106-
returnNone
107-
else:
108-
returncls._activeQue[-1]
97+
"""Return the active manager, or *None* if there is no manager."""
98+
returnnext(reversed(cls.figs.values()))ifcls.figselseNone
10999

110100
@classmethod
111101
defset_active(cls,manager):
112-
"""
113-
Make the figure corresponding to *manager* the active one.
114-
"""
115-
oldQue=cls._activeQue[:]
116-
cls._activeQue= [mforminoldQueifm!=manager]
117-
cls._activeQue.append(manager)
102+
"""Make *manager* the active manager."""
118103
cls.figs[manager.num]=manager
104+
cls.figs.move_to_end(manager.num)
119105

120106
@classmethod
121107
defdraw_all(cls,force=False):
122108
"""
123-
Redraw all figures registered with the pyplot
124-
state machine.
109+
Redraw allstale managedfigures, or, if *force* is True, all managed
110+
figures.
125111
"""
126-
forf_mgrincls.get_all_fig_managers():
127-
ifforceorf_mgr.canvas.figure.stale:
128-
f_mgr.canvas.draw_idle()
112+
formanagerincls.get_all_fig_managers():
113+
ifforceormanager.canvas.figure.stale:
114+
manager.canvas.draw_idle()
115+
129116

130117
atexit.register(Gcf.destroy_all)

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