[Bug]: Can't save with custom toolbar #28069
Description
Bug summary
Cannot save figure when using mpl.rcParams["toolbar"] = "toolmanager".
Attempting to save the figure by pressing Ctrl+S or by clicking the save button shows the error, and does not open the save window.
Code for reproduction
import matplotlib as mpl
import matplotlib.pyplot as plt
mpl.rcParams["toolbar"] = "toolmanager"
plt.subplots(1, 1)
plt.show()Actual outcome
E:\bug.py:4: UserWarning: Treat the new Tool classes introduced in v1.5 as experimental for now; the API and rcParam may change in future versions.
mpl.rcParams["toolbar"] = "toolmanager"
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python311\Lib\tkinter\__init__.py", line 1948, in __call__
return self.func(*args)
^^^^^^^^^^^^^^^^
File "C:\Users\admin\AppData\Roaming\Python\Python311\site-packages\matplotlib\backends\_backend_tk.py", line 1002, in <lambda>
lambda: self._button_click(name))
^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\admin\AppData\Roaming\Python\Python311\site-packages\matplotlib\backends\_backend_tk.py", line 1023, in _button_click
self.trigger_tool(name)
File "C:\Users\admin\AppData\Roaming\Python\Python311\site-packages\matplotlib\backend_bases.py", line 3308, in trigger_tool
self.toolmanager.trigger_tool(name, sender=self)
File "C:\Users\admin\AppData\Roaming\Python\Python311\site-packages\matplotlib\backend_managers.py", line 340, in trigger_tool
tool.trigger(sender, canvasevent, data) # Actually trigger Tool.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\admin\AppData\Roaming\Python\Python311\site-packages\matplotlib\backends\_backend_tk.py", line 1046, in trigger
NavigationToolbar2Tk.save_figure(
File "C:\Users\admin\AppData\Roaming\Python\Python311\site-packages\matplotlib\backends\_backend_tk.py", line 849, in save_figure
filetype_variable = tk.StringVar(self, default_filetype)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python311\Lib\tkinter\__init__.py", line 562, in __init__
Variable.__init__(self, master, value, name)
File "C:\Python311\Lib\tkinter\__init__.py", line 394, in __init__
self._root = master._root()
^^^^^^^^^^^^
AttributeError: 'types.SimpleNamespace' object has no attribute '_root'
Expected outcome
A save dialog window with the default file type as .png.
Additional information
Replacing self with None from the line below did suppress the error, but did not set the default file type.
Operating system
Windows 10
Matplotlib Version
3.8.3
Matplotlib Backend
TkAgg
Python version
Python 3.11.4
Jupyter version
No response
Installation
pip