mouse wheel scrolling in gtk

mouse wheel scrolling in gtk

[Joachim Nilsson]

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Hi!

I often have just one Emacs frame open on my X desktop.  It's usually
fully maximized (full screen with no borders) to utilize all possible
screen estate.

This frame is usually split in several windows. (I often also use ECB,
but this report applies regardless.)

When coding I use these windows to display all types of references (.c
and .h files) while having one "main" window where my current focus is. 
This is also where I want my cursor to sit.  Frequently I want to scroll
up/down in one of the other windows (where my cursor is not ...) so I
move my mouse and use the scroll-wheel to pan the reference list.

In Emacs (toolkit: gtk) I cannot use the wheel to (vertically) scroll
unless the cursor is there as well.  Correction, if I hold the pointer
above that window's scroll bar I can, but not over any other part of
that other window. 

This is a bit counter intuitive since other Gtk/Gnome applications honor
this.  I.e. you can mouse-wheel-scroll any of an applications parts
without having to first click/focus that part of the application.

Can this be fixed, or is there perhaps some configuration setting that I
have missed?

Regards
 /Jocke

P.S.  I hope I have used the correct Emacs terms (frame vs. window). 





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Re: mouse wheel scrolling in gtk

[Miles Bader]

Joachim Nilsson <joachim.nilsson@vmlinux.org> writes:
> This is a bit counter intuitive since other Gtk/Gnome applications honor
> this.  I.e. you can mouse-wheel-scroll any of an applications parts
> without having to first click/focus that part of the application.
>
> Can this be fixed, or is there perhaps some configuration setting that I
> have missed?

C-h v mouse-wheel-follow-mouse RET

   `mouse-wheel-follow-mouse' is a variable defined in `mwheel.el'.

   Whether the mouse wheel should scroll the window that the mouse is over.
   This can be slightly disconcerting, but some people prefer it.

[I set this to t myself, and I think the default value is kind of silly
personally...]

-Miles

-- 
`...the Soviet Union was sliding in to an economic collapse so comprehensive
 that in the end its factories produced not goods but bads: finished products
 less valuable than the raw materials they were made from.'  [The Economist]

RE: mouse wheel scrolling in gtk

[Drew Adams]

> > This is a bit counter intuitive since other Gtk/Gnome 
> > applications honor this.  I.e. you can mouse-wheel-scroll any of
> > an applications parts without having to first click/focus that
> > part of the application.
> >
> > Can this be fixed, or is there perhaps some configuration 
> > setting that I have missed?
> 
> C-h v mouse-wheel-follow-mouse RET
> 
>    `mouse-wheel-follow-mouse' is a variable defined in `mwheel.el'.
> 
>    Whether the mouse wheel should scroll the window that the 
>    mouse is over. This can be slightly disconcerting, but some
>    people prefer it.
> 
> [I set this to t myself, and I think the default value is 
> kind of silly personally...]

I don't use Gtk/Gnome much, so I don't really care about this for my own use,
but I agree with Miles (and, I suspect, Joachim).

It seems silly that the default behavior of a mouse wheel wouldn't be to scroll
what the mouse points to. Talk about counter-intuitive...

And I (obviously) think the last part of the doc string is inappropriate and
should be removed. On the contrary, it's disconcerting to have a pointing device
*not* act on what it points to but on something somewhere else. The mouse should
identify by its location what it acts on. Sheesh...

[Also, "this" is ambiguous in the last doc-string sentence. The sentence really
says that "whether..." can be disconcerting. I suspect it is trying to say
instead that scroll focus following the mouse (that is, a value of t) can be
disconcerting (which is wrong, IMO).]

Re: mouse wheel scrolling in gtk

[Joachim Nilsson]

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Solved!

Miles Bader wrote, on 07/30/2008 02:45 AM:
> Joachim Nilsson <joachim.nilsson@vmlinux.org> writes:
>   
>> This is a bit counter intuitive since other Gtk/Gnome applications honor
>> this.  I.e. you can mouse-wheel-scroll any of an applications parts
>> without having to first click/focus that part of the application.
>> Can this be fixed, or is there perhaps some configuration setting that I
>> have missed?
>>     
> C-h v mouse-wheel-follow-mouse RET
>    `mouse-wheel-follow-mouse' is a variable defined in `mwheel.el'.
>    Whether the mouse wheel should scroll the window that the mouse is over.
>    This can be slightly disconcerting, but some people prefer it.
>   

Ouch, thanks Miles!

Turns out I had the following culprit embedded deep in my .emacs:

;; setup scroll mouse settings
(defun up-slightly () (interactive) (scroll-up 5))
(defun down-slightly () (interactive) (scroll-down 5))
(global-set-key [mouse-4] 'down-slightly)
(global-set-key [mouse-5] 'up-slightly)

(defun up-one () (interactive) (scroll-up 1))
(defun down-one () (interactive) (scroll-down 1))
(global-set-key [S-mouse-4] 'down-one)
(global-set-key [S-mouse-5] 'up-one)

(defun up-a-lot () (interactive) (scroll-up))
(defun down-a-lot () (interactive) (scroll-down))
(global-set-key [C-mouse-4] 'down-a-lot)
(global-set-key [C-mouse-5] 'up-a-lot)

As soon as I'd removed it the default settings for mouse wheel mode
worked just fine for my purposes!

Many thanks!
 /Jocke


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Re: mouse wheel scrolling in gtk

[Stefan Monnier]

> I don't use Gtk/Gnome much, so I don't really care about this for my own use,
> but I agree with Miles (and, I suspect, Joachim).

Great, so we all agree.  Including the CVS trunk.
Let's all have a hug,


        Stefan

Re: mouse wheel scrolling in gtk

[Miles Bader]

Stefan Monnier <monnier@iro.umontreal.ca> writes:
> Great, so we all agree.  Including the CVS trunk.
> Let's all have a hug,

Whoops... :-)

Perhaps the editorializing in the docstring should be removed?

-Miles

-- 
"An atheist doesn't have to be someone who thinks he has a proof that
there can't be a god.  He only has to be someone who believes that the
evidence on the God question is at a similar level to the evidence on
the werewolf question."  [John McCarthy]

Re: mouse wheel scrolling in gtk

[Stefan Monnier]

>> Great, so we all agree.  Including the CVS trunk.
>> Let's all have a hug,

> Whoops... :-)

> Perhaps the editorializing in the docstring should be removed?

I don't think it's important either way,


        Stefan