Skip to content
Navigation Menu
{{ message }}
forked from matplotlib/matplotlib
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathbackend_managers.py
More file actions
387 lines (314 loc) · 11.5 KB
/
Copy pathbackend_managers.py
File metadata and controls
387 lines (314 loc) · 11.5 KB
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
from matplotlib import _api, backend_tools, cbook, widgets
class ToolEvent:
"""Event for tool manipulation (add/remove)."""
def __init__(self, name, sender, tool, data=None):
self.name = name
self.sender = sender
self.tool = tool
self.data = data
class ToolTriggerEvent(ToolEvent):
"""Event to inform that a tool has been triggered."""
def __init__(self, name, sender, tool, canvasevent=None, data=None):
super().__init__(name, sender, tool, data)
self.canvasevent = canvasevent
class ToolManagerMessageEvent:
"""
Event carrying messages from toolmanager.
Messages usually get displayed to the user by the toolbar.
"""
def __init__(self, name, sender, message):
self.name = name
self.sender = sender
self.message = message
class ToolManager:
"""
Manager for actions triggered by user interactions (key press, toolbar
clicks, ...) on a Figure.
Attributes
----------
figure : `.Figure`
keypresslock : `~matplotlib.widgets.LockDraw`
`.LockDraw` object to know if the `canvas` key_press_event is locked.
messagelock : `~matplotlib.widgets.LockDraw`
`.LockDraw` object to know if the message is available to write.
"""
def __init__(self, figure=None):
self._key_press_handler_id = None
self._tools = {}
self._keys = {}
self._toggled = {}
self._callbacks = cbook.CallbackRegistry()
# to process keypress event
self.keypresslock = widgets.LockDraw()
self.messagelock = widgets.LockDraw()
self._figure = None
self.set_figure(figure)
@property
def canvas(self):
"""Canvas managed by FigureManager."""
if not self._figure:
return None
return self._figure.canvas
@property
def figure(self):
"""Figure that holds the canvas."""
return self._figure
@figure.setter
def figure(self, figure):
self.set_figure(figure)
def set_figure(self, figure, update_tools=True):
"""
Bind the given figure to the tools.
Parameters
----------
figure : `.Figure`
update_tools : bool, default: True
Force tools to update figure.
"""
if self._key_press_handler_id:
self.canvas.mpl_disconnect(self._key_press_handler_id)
self._figure = figure
if figure:
self._key_press_handler_id = self.canvas.mpl_connect(
'key_press_event', self._key_press)
if update_tools:
for tool in self._tools.values():
tool.figure = figure
def toolmanager_connect(self, s, func):
"""
Connect event with string *s* to *func*.
Parameters
----------
s : str
The name of the event. The following events are recognized:
- 'tool_message_event'
- 'tool_removed_event'
- 'tool_added_event'
For every tool added a new event is created
- 'tool_trigger_TOOLNAME', where TOOLNAME is the id of the tool.
func : callable
Callback function for the toolmanager event with signature::
def func(event: ToolEvent) -> Any
Returns
-------
cid
The callback id for the connection. This can be used in
`.toolmanager_disconnect`.
"""
return self._callbacks.connect(s, func)
def toolmanager_disconnect(self, cid):
"""
Disconnect callback id *cid*.
Example usage::
cid = toolmanager.toolmanager_connect('tool_trigger_zoom', onpress)
#...later
toolmanager.toolmanager_disconnect(cid)
"""
return self._callbacks.disconnect(cid)
def message_event(self, message, sender=None):
"""Emit a `ToolManagerMessageEvent`."""
if sender is None:
sender = self
s = 'tool_message_event'
event = ToolManagerMessageEvent(s, sender, message)
self._callbacks.process(s, event)
@property
def active_toggle(self):
"""Currently toggled tools."""
return self._toggled
def get_tool_keymap(self, name):
"""
Return the keymap associated with the specified tool.
Parameters
----------
name : str
Name of the Tool.
Returns
-------
list of str
List of keys associated with the tool.
"""
keys = [k for k, i in self._keys.items() if i == name]
return keys
def _remove_keys(self, name):
for k in self.get_tool_keymap(name):
del self._keys[k]
def update_keymap(self, name, key):
"""
Set the keymap to associate with the specified tool.
Parameters
----------
name : str
Name of the Tool.
key : str or list of str
Keys to associate with the tool.
"""
if name not in self._tools:
raise KeyError(f'{name!r} not in Tools')
self._remove_keys(name)
if isinstance(key, str):
key = [key]
for k in key:
if k in self._keys:
_api.warn_external(
f'Key {k} changed from {self._keys[k]} to {name}')
self._keys[k] = name
def remove_tool(self, name):
"""
Remove tool named *name*.
Parameters
----------
name : str
Name of the tool.
"""
tool = self.get_tool(name)
if getattr(tool, 'toggled', False): # If it's a toggled toggle tool, untoggle
self.trigger_tool(tool, 'toolmanager')
self._remove_keys(name)
event = ToolEvent('tool_removed_event', self, tool)
self._callbacks.process(event.name, event)
del self._tools[name]
def add_tool(self, name, tool, *args, **kwargs):
"""
Add *tool* to `ToolManager`.
If successful, adds a new event ``tool_trigger_{name}`` where
``{name}`` is the *name* of the tool; the event is fired every time the
tool is triggered.
Parameters
----------
name : str
Name of the tool, treated as the ID, has to be unique.
tool : type
Class of the tool to be added. A subclass will be used
instead if one was registered for the current canvas class.
*args, **kwargs
Passed to the *tool*'s constructor.
See Also
--------
matplotlib.backend_tools.ToolBase : The base class for tools.
"""
tool_cls = backend_tools._find_tool_class(type(self.canvas), tool)
if not tool_cls:
raise ValueError('Impossible to find class for %s' % str(tool))
if name in self._tools:
_api.warn_external('A "Tool class" with the same name already '
'exists, not added')
return self._tools[name]
tool_obj = tool_cls(self, name, *args, **kwargs)
self._tools[name] = tool_obj
if tool_obj.default_keymap is not None:
self.update_keymap(name, tool_obj.default_keymap)
# For toggle tools init the radio_group in self._toggled
if isinstance(tool_obj, backend_tools.ToolToggleBase):
# None group is not mutually exclusive, a set is used to keep track
# of all toggled tools in this group
if tool_obj.radio_group is None:
self._toggled.setdefault(None, set())
else:
self._toggled.setdefault(tool_obj.radio_group, None)
# If initially toggled
if tool_obj.toggled:
self._handle_toggle(tool_obj, None, None)
tool_obj.set_figure(self.figure)
event = ToolEvent('tool_added_event', self, tool_obj)
self._callbacks.process(event.name, event)
return tool_obj
def _handle_toggle(self, tool, canvasevent, data):
"""
Toggle tools, need to untoggle prior to using other Toggle tool.
Called from trigger_tool.
Parameters
----------
tool : `.ToolBase`
canvasevent : Event
Original Canvas event or None.
data : object
Extra data to pass to the tool when triggering.
"""
radio_group = tool.radio_group
# radio_group None is not mutually exclusive
# just keep track of toggled tools in this group
if radio_group is None:
if tool.name in self._toggled[None]:
self._toggled[None].remove(tool.name)
else:
self._toggled[None].add(tool.name)
return
# If the tool already has a toggled state, untoggle it
if self._toggled[radio_group] == tool.name:
toggled = None
# If no tool was toggled in the radio_group
# toggle it
elif self._toggled[radio_group] is None:
toggled = tool.name
# Other tool in the radio_group is toggled
else:
# Untoggle previously toggled tool
self.trigger_tool(self._toggled[radio_group],
self,
canvasevent,
data)
toggled = tool.name
# Keep track of the toggled tool in the radio_group
self._toggled[radio_group] = toggled
def trigger_tool(self, name, sender=None, canvasevent=None, data=None):
"""
Trigger a tool and emit the ``tool_trigger_{name}`` event.
Parameters
----------
name : str
Name of the tool.
sender : object
Object that wishes to trigger the tool.
canvasevent : Event
Original Canvas event or None.
data : object
Extra data to pass to the tool when triggering.
"""
tool = self.get_tool(name)
if tool is None:
return
if sender is None:
sender = self
if isinstance(tool, backend_tools.ToolToggleBase):
self._handle_toggle(tool, canvasevent, data)
tool.trigger(sender, canvasevent, data) # Actually trigger Tool.
s = 'tool_trigger_%s' % name
event = ToolTriggerEvent(s, sender, tool, canvasevent, data)
self._callbacks.process(s, event)
def _key_press(self, event):
if event.key is None or self.keypresslock.locked():
return
name = self._keys.get(event.key, None)
if name is None:
return
self.trigger_tool(name, canvasevent=event)
@property
def tools(self):
"""A dict mapping tool name -> controlled tool."""
return self._tools
def get_tool(self, name, warn=True):
"""
Return the tool object with the given name.
For convenience, this passes tool objects through.
Parameters
----------
name : str or `.ToolBase`
Name of the tool, or the tool itself.
warn : bool, default: True
Whether a warning should be emitted it no tool with the given name
exists.
Returns
-------
`.ToolBase` or None
The tool or None if no tool with the given name exists.
"""
if (isinstance(name, backend_tools.ToolBase)
and name.name in self._tools):
return name
if name not in self._tools:
if warn:
_api.warn_external(
f"ToolManager does not control tool {name!r}")
return None
return self._tools[name]
You can’t perform that action at this time.