Terry J. Reedy added the comment:
We already know that setting StringVar font_name triggers a change to changes.
We also know that manually clicking or Up or Down triggers <<ListBoxSelect>>,
which sets font_name and redraws the box. The challenge is to do something
that will trigger the virtual event. Then we can write a test methods
something like
def test_sample(self):
fontlist = configure.fontlist
if fontlist.size():
name0 = fontlist.get(0).lower()
# fontlist.selection_set(0) # or something
print('\n', changes) # temp to testing that changes changes
self.assertEqual(changes['main']['EditorWindow']['font'], name0)
But selection_set does not trigger the event. After fiddling around with
various bindings event_generate()s and update()s and update_idletasks(), I
concluded, again, that either event_generate or its documentation is badly
broken. The only thing I got to work in hours of experiments is this:
import tkinter as tk
root = tk.Tk()
seq = '<ButtonRelease-1>'
root.bind(seq, lambda event: print('generated', event))
root.update_idletasks() # or update()
root.event_generate(seq)
# update here fails
Adding a widget and binding to the widget always failed.
Here is my attempt using Serhiy's simulate_mouse_click. (This goes in
test_configdialog.FontTabTest.
def test_sample(self):
fontlist = configure.fontlist
if fontlist.size():
name0 = fontlist.get(0).lower()
fontlist.see(0)
x, y, dx, dy = fontlist.bbox(0)
fontlist.bind('<ButtonRelease-1>', lambda event: print(event))
mouse_click(fontlist, x + dx//2, y + dy//2)
fontlist.update()
print('\n', changes) # temporary, see if changes has anything
self.assertEqual(changes['main']['EditorWindow']['font'], name0)
Serhiy, do you have any idea why I cannot get event_generate to work for a
listbox, even with your function? I have tried somewhere close to 20 variations.
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<http://bugs.python.org/issue30870>
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