[issue25015] Idle: scroll Text faster with mouse wheel

[Terry J. Reedy]

Terry J. Reedy  added the comment:

This is 'out of date' in the sense that I have decided that the root problem is 
scrolling by pixels instead of lines.  Once we do the latter, for #33664, we 
can just scroll by, say, 5 lines instead of 3, which I think is sufficient.

--
resolution:  -> out of date
stage: test needed -> resolved
status: open -> closed
superseder:  -> IDLE:  scroll text by lines, not pixels.

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[issue25015] Idle: scroll Text faster with mouse wheel

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Serhiy, I do not understand your 'Run ...' sentence.

Sorry, there was a typo in my sentence. I meant "Run the program 'wish' and 
enter the following command".

--

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[issue25015] Idle: scroll Text faster with mouse wheel

[Terry J. Reedy]

Changes by Terry J. Reedy :


--
assignee:  -> terry.reedy
components: +IDLE
versions: +Python 3.7 -Python 2.7, Python 3.4, Python 3.5

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[issue25015] Idle: scroll Text faster with mouse wheel

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

You can measure your mouse speed with following pure Tcl/Tk script.

--
Added file: http://bugs.python.org/file40385/MouseWheelTrace.tcl

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[issue25015] Idle: scroll Text faster with mouse wheel

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Or with following Python script.

--
Added file: http://bugs.python.org/file40386/MouseWheelTrace.py

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[issue25015] Idle: scroll Text faster with mouse wheel

[Terry J. Reedy]

Terry J. Reedy added the comment:

The SO OP reported Idle Shell and Editor behavior.  I retested minimal 
tk.Text(root).pack(), eliminating Idle as a factor, before and after changing 
system lines setting from 3 to 9, and got the constant same behavior.  The now 
too small 50 pixels seems about what it is doing.

Serhiy, I do not understand your 'Run ...' sentence.

--
nosy: +markroseman

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[issue25015] Idle: scroll Text faster with mouse wheel

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

On X Window the scroll step in text widget is constant (50 pixels). On Windows 
and Mac OS it should depend on mouse settings.

Run with, execute

bind .  {puts %D}

and try to roll mouse wheel on Tk window with different speed and settings.

--
nosy: +serhiy.storchaka

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[issue25015] Idle: scroll Text faster with mouse wheel

[Terry J. Reedy]

New submission from Terry J. Reedy:

https://stackoverflow.com/questions/32414942/python-scroll-speed
At least on Win7, tk.Texts scroll, by default, at an anemic 2-3 lines per wheel 
click, ignoring the system wheel setting. What happens on other systems?  I 
consider this a probable tk bug, at least on Widows, but we can override the 
default (on Windows) with

def mousescroll(event):
   
   return 'break'
text.bind('', mousescroll)

turtledemo.__main__ has wheel code (for font resizing) for Windows, Linux, and 
Mac. Unless we can access system settings, we might add a config option.

--
messages: 250013
nosy: terry.reedy
priority: normal
severity: normal
stage: test needed
status: open
title: Idle: scroll Text faster with mouse wheel
type: enhancement
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6

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