Re: Smooth scrolling

[Felix Riemann <friemann gnome org>]

Am Dienstag, den 02.10.2012, 06:15 +0200 schrieb Ana Dolosa:
>   Hi all,

Hi Ana,

> 
>   I am using EOG 3.4.2 over Kubuntu Precise amd64, actually I have
> JUST UPGRADED from Kubuntu Oneiric a week ago ... and there's
> something a bit rare ... an odd behaviour I'd like to let you know. 
> 
>   It is regarding scrolling. First telling you that some time ago I
> switched scrolling and zooming using a Dconf-editor option ... so that
> when I move the finger through my touchpad I'm actually scrolling ...
> not zooming. Anyway ... to the point :
> 
>   The fact is that when I open an image (in my case they use to be
> LONG 'documents') and I scroll it down and up ... the image is
> scrolled down and up in little steps ...  BUT ... when the cursor
> pointer is OVER the scrollbar and I repeat the previous proccess, the
> scroll movement doesn't happen in little steps but it scrolls in a
> SMOOTHLY way ... that's GREAT !!!  Here you can watch an example :
> https://vimeo.com/50581609
> 
>   Well ... I don't know if this is a new behaviour, an expected
> one ... I don't know whether it is related to an EOG new release
> (3.4.*) or maybe an new kind of interaction between EOG and Kwin
> (1) ... the fact is that it's the first time I notice it and I like it
> a lot  ( actually EOG smooth scrolling is a feature I have sometimes
> dreamt of )  ... but I would also like to ask if there is a way to get
> this SMOOTH scrolling without needing the cursor pointer to be over
> the scrollbar.
> 
>   Sometime ago, I can't remember where I read that usability experts
> had found that many (maybe 'most', I can't remember exactly) people,
> while surfing and reading on the Web, they used to 'leave' the cursor
> pointer 'resting' on the right side of the screen, not over the
> scrollbar but on the right side. Well ... it happens that it is also
> my way when surfing on the net ... and when using EOG too ...
> 
>   For me the most confortable way of getting this SMOOTH scrolling
> would be having it BY DEFAULT without needing to remember everytime
> that I need to position the cursor pointer over the scrollbar, ie.
> getting this behaviour in a SEAMLESS way ... so I'd like to ask
> you ... 
> 
>   ... is there any hidden option in Dconf ... or there is any plugin
> to get this kind of behaviour ????

that's an interesting find. As a first guess I'd say scrolling over the
scrollbar uses GTK+'s scrolling code which gained smooth scrolling
abilities in 3.4 while scrolling over the picture uses eog's scrolling
code which doesn't do smooth scrolling.

As I agree with you about unifying the scrolling behaviour, I'd like to
ask you to report this as a bug in our Bugzilla.

Regards,

Felix