Re: scrolling down with a single click

> Date: Tue, 11 Apr 2006 14:39:18 +0200
> From: Marian Petras <[email protected]>
> To: NB UI <[email protected]>
> Subject: [nbui] scrolling down with a single click
> 
> Hello,
> it has been a long time I have been thinking about my difficulty with 
> scrolling - watching moving text.

> So I have been trying to find a way 
> how to scroll to a certain position without the need for watching the 
> moving content on the screen.


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.

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.

    For example, I know I'm not succesfull with scrolling in java text
    applications because the arrows scroll not by a line but by some X
    number of pixels. Scrolling using the bubble also isn't quantized
    by line

> 
> 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

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

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

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

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