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

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Package: emacs; Severity: minor; Reported by: Angelo Graziosi <angelo.graziosi@HIDDEN>; dated Tue, 29 Jul 2014 10:58:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Tue, 29 Jul 2014 15:29:09 +0300
From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
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> Date: Tue, 29 Jul 2014 14:13:27 +0200
> From: Angelo Graziosi <angelo.graziosi@HIDDEN>
> 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.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18143; Package emacs. Full text available.

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Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
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Il 29/07/2014 14:02, Eli Zaretskii ha scritto:
>> Date: Tue, 29 Jul 2014 12:56:26 +0200
>> From: Angelo Graziosi <angelo.graziosi@HIDDEN>
>>
>> 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..




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18143; Package emacs. Full text available.

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From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#18143: Vertical scroll bar does not work with Image files
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> Date: Tue, 29 Jul 2014 12:56:26 +0200
> From: Angelo Graziosi <angelo.graziosi@HIDDEN>
> 
> 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.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18143; Package emacs. Full text available.

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Subject: Vertical scroll bar does not work with Image files
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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.




Acknowledgement sent to Angelo Graziosi <angelo.graziosi@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#18143; Package emacs. Full text available.
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