GNU bug report logs - #18143
Vertical scroll bar does not work with Image files

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Angelo Graziosi <angelo.graziosi <at> alice.it>
To: bug-gnu-emacs <at> gnu.org
Subject: Vertical scroll bar does not work with Image files
Date: Tue, 29 Jul 2014 12:56:26 +0200

When an image file (jpg, png..) is displayed greater than the frame 
dimensions, a way to explore it is using the arrow keys (up, down, left 
and right).

With the introduction of horizontal scroll bar, it is very nice to use 
it in place of L-R arrow keys: the HSB works fine here!

This does not occur with vertical scroll bar. It has the full height of 
the frame and cannot be moved U-D. So the only way to explore the image 
vertically is to use the U-D keys.

I see this both with MSYS2/MinGW64 and Cygwin builds of Emacs trunk.


Ciao,
 Angelo.

Message #8 received at 18143 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Angelo Graziosi <angelo.graziosi <at> alice.it>
Cc: 18143 <at> debbugs.gnu.org
Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
Date: Tue, 29 Jul 2014 15:02:55 +0300

> Date: Tue, 29 Jul 2014 12:56:26 +0200
> From: Angelo Graziosi <angelo.graziosi <at> alice.it>
> 
> When an image file (jpg, png..) is displayed greater than the frame 
> dimensions, a way to explore it is using the arrow keys (up, down, left 
> and right).
> 
> With the introduction of horizontal scroll bar, it is very nice to use 
> it in place of L-R arrow keys: the HSB works fine here!
> 
> This does not occur with vertical scroll bar. It has the full height of 
> the frame and cannot be moved U-D. So the only way to explore the image 
> vertically is to use the U-D keys.
> 
> I see this both with MSYS2/MinGW64 and Cygwin builds of Emacs trunk.

What you see is due to the difference between the 2 scroll bars in how
the size of the scroll-bar thumb is computed: in character units for
the vertical scroll bar vs pixel units for the horizontal scroll bar.

Message #11 received at 18143 <at> debbugs.gnu.org (full text, mbox):

From: Angelo Graziosi <angelo.graziosi <at> alice.it>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 18143 <at> debbugs.gnu.org
Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
Date: Tue, 29 Jul 2014 14:13:27 +0200

Il 29/07/2014 14:02, Eli Zaretskii ha scritto:
>> Date: Tue, 29 Jul 2014 12:56:26 +0200
>> From: Angelo Graziosi <angelo.graziosi <at> alice.it>
>>
>> When an image file (jpg, png..) is displayed greater than the frame
>> dimensions, a way to explore it is using the arrow keys (up, down, left
>> and right).
>>
>> With the introduction of horizontal scroll bar, it is very nice to use
>> it in place of L-R arrow keys: the HSB works fine here!
>>
>> This does not occur with vertical scroll bar. It has the full height of
>> the frame and cannot be moved U-D. So the only way to explore the image
>> vertically is to use the U-D keys.
>>
>> I see this both with MSYS2/MinGW64 and Cygwin builds of Emacs trunk.
>
> What you see is due to the difference between the 2 scroll bars in how
> the size of the scroll-bar thumb is computed: in character units for
> the vertical scroll bar vs pixel units for the horizontal scroll bar.
>

But is this a bug? I would convert also the vertical scroll bar to pixel 
unit..

Message #14 received at 18143 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Angelo Graziosi <angelo.graziosi <at> alice.it>
Cc: 18143 <at> debbugs.gnu.org
Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
Date: Tue, 29 Jul 2014 15:29:09 +0300

> Date: Tue, 29 Jul 2014 14:13:27 +0200
> From: Angelo Graziosi <angelo.graziosi <at> alice.it>
> CC: 18143 <at> debbugs.gnu.org
> 
> > What you see is due to the difference between the 2 scroll bars in how
> > the size of the scroll-bar thumb is computed: in character units for
> > the vertical scroll bar vs pixel units for the horizontal scroll bar.
> 
> But is this a bug?

No, it's a direct consequence of how the thumb size calculation was
designed to work.

> I would convert also the vertical scroll bar to pixel unit.

Please suggest a method of doing that.  I thought about that, and
concluded that it wasn't trivial.  I'd be happy to learn what I
missed.

Message #17 received at 18143 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 18143 <at> debbugs.gnu.org, Angelo Graziosi <angelo.graziosi <at> alice.it>
Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
Date: Wed, 12 Aug 2020 11:39:28 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Date: Tue, 29 Jul 2014 14:13:27 +0200
>> From: Angelo Graziosi <angelo.graziosi <at> alice.it>
>> CC: 18143 <at> debbugs.gnu.org
>>
>> > What you see is due to the difference between the 2 scroll bars in how
>> > the size of the scroll-bar thumb is computed: in character units for
>> > the vertical scroll bar vs pixel units for the horizontal scroll bar.
>>
>> But is this a bug?
>
> No, it's a direct consequence of how the thumb size calculation was
> designed to work.

So there is no bug in that regard.

>> I would convert also the vertical scroll bar to pixel unit.
>
> Please suggest a method of doing that.  I thought about that, and
> concluded that it wasn't trivial.  I'd be happy to learn what I
> missed.

No one has suggested such a method within 6 years.  So should this be
closed, or is there anything more to do here?

Best regards,
Stefan Kangas

Message #20 received at 18143 <at> debbugs.gnu.org (full text, mbox):

From: Angelo Graziosi <angelo.g0 <at> libero.it>
To: "18143 <at> debbugs.gnu.org" <18143 <at> debbugs.gnu.org>,
 "stefan <at> marxist.se" <stefan <at> marxist.se>
Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
Date: Thu, 13 Aug 2020 11:54:32 +0200 (CEST)

Too much time has passed and I can't remember the details... please close.

Message #23 received at 18143 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Angelo Graziosi <angelo.g0 <at> libero.it>, 
 "18143-done <at> debbugs.gnu.org" <18143 <at> debbugs.gnu.org>
Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
Date: Thu, 13 Aug 2020 04:04:21 -0700

Angelo Graziosi <angelo.g0 <at> libero.it> writes:

> Too much time has passed and I can't remember the details... please close.

Thanks for replying back.  I'm closing this bug report.

Best regards,
Stefan Kangas

Message #28 received at 18143-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: 18143-done <at> debbugs.gnu.org
Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
Date: Thu, 1 Oct 2020 05:12:42 -0700

Stefan Kangas <stefan <at> marxist.se> writes:

> Angelo Graziosi <angelo.g0 <at> libero.it> writes:
>
>> Too much time has passed and I can't remember the details... please close.
>
> Thanks for replying back.  I'm closing this bug report.

Accidentally left this open; closing now.

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