Re: scrolling down with a single click

Ivan Soleimanipour wrote:
>> Hello,
>> it has been a long time I have been thinking about my difficulty with 
>> scrolling - watching moving text.
> 
>> ...
> 
> This is an unusual phenomenon Marian.
> Moving things, just by themselves, should not cause problems.
> They play part of a feedback loop for our excellent motor control systems.
> It's how we can catch a moving ball, and aim the mouse pointer with 
> the mouse.

That's true. The truth also is that this is harder with people with 
inferior eyesight, even if they wear glasses. One of the reason is that 
glasses never provide 100% compensation for poor eyesight so people who 
need glasses cannot see as well as people with healthy eyes. This is 
also the reason I have difficulty playing volleyball.


> Could it be that scrolling is difficult because the feedback loop
> is not perfect? It may be jumpy and not smooth enough, too slow etc.

This is definitely an aspect that makes things worse.


>  ...
> 
>> The basic idea is:
>>
>>     -------------------------------------------------
>>     Before I start scrolling down, I usually know the
>>     top boundary of the area I want to make visible.
>>     -------------------------------------------------
> 
> This is a fine idea. for example 'vi' has these:
> 
>      zCR   redraw screen with current line at top of window

Or  'zt'  in Vim

>      z-CR  redraw screen with current line at bottom of window

Or  'zb'  in Vim

>      z.CR  redraw screen with current line at center of window

Or  'zz'  in Vim


> And I'm sure there's an equivalent in emacs.

I know - I use the above shortcuts in Vim. There are two problems with them:
  - they do not work in NetBeans
  - they require that you first place the text editor cursor


> However, are you sure you're solving the right problem here?

Yes, I am sure. I believe implementation of the described change 
(enhancement) would not hurt anybody, it would help people with inferior 
eyesight and other people could find it useful, too, as it could prove a 
a general usability improvement.

Marian