Terry J. Reedy <[email protected]> added the comment:
I won't merge with mousescroll duplicated, or worse, triplicated. If
'self.text/canvas' is replaced with 'event.widget', then the 'self' parameter
can be deleted and the function made a standalone module function. For now,
put it in tree, copied with the docstring from editor.py. Then import it into
editor. (Reason: Avoid creating more import loops.)
This will make mousescroll depend on IDLE not subclassing text/canvas and
overriding yview_scroll. It currently does not and I expect it never will.
But, to be safe, this should be added to the docstring, and tested (fairly
simple) along with other added tests.
The labels partially blocking the canvas bindings is nasty. Mousescroll is
wrapped as a tk script for each label. I expect to eventually replace the
labels and other visual tree stuff with a ttk.Treeview. Then no canvas wheel
bindings will be needed. In anticipation of that, replace 'yview_scroll(' with
the equivalent 'yview(SCROLL,' (Treeview only has the latter.) The resulting
line will be
event.widget.yview(SCROLL, lines, "units")
For some reason, creating a module browser for pyshell takes 3 times as long
with my repository 3.9 debug build as with my 3.8 installed normal build. (The
ration is usually about 2.) But the patch with the extra bindings and
wrappings does not make it much worse, if any.
Scrolling by moving mouse while holding down middle mouse wheel seems to be
built into Text. But I never/seldom use it and have not tried to add it to
anything else. At least on Windows, it works differently than on Firefox.
Text only moved with drag, which makes it jerky, not with distance from start
position. And one cannot only scroll part of a large file, not to top and
bottom. Notepad and notepad++ do not have it. So skip it for now.
When one edits a branch and pushes commits to ones github fork, the changes
appear on any existing PR. Closing a PR and reopening a new one is unusual and
loses comments. Post to core-mentorship if you need help with git and our
workflow. My PR-15360 comment applies to the current one.
----------
stage: patch review -> test needed
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<https://bugs.python.org/issue37902>
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