[okular] [Bug 414688] New: Add support for alternative scrolling method

[Yegor Ivashchenko]

https://bugs.kde.org/show_bug.cgi?id=414688

            Bug ID: 414688
           Summary: Add support for alternative scrolling method
           Product: okular
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: yegor.ivashchenko at protonmail.com
  Target Milestone: ---

Created attachment 124208
  --> https://bugs.kde.org/attachment.cgi?id=124208&action=edit
demo

SUMMARY
I propose adding alternative scrolling behavior. It helps keeping up the
reading speed in auto-scroll mode and it tires eyes less compared to
traditional scrolling behavior. It's easier to show it once rather than explain
it, so please check attached gif.

OBSERVED RESULT
In traditional scrolling entire page content moves upwards or downwards in
order to make space for new or previous content.

EXPECTED RESULT
Keep page content steady. Have a separation horizontal line moving from top to
bottom of a viewport. Everything below the line is a content of a current page.
Everything above the line is a content of a next page. Line can be stylized as
a shadow. Page is not necessarily a next page in a document but rather a
viewport range of a document. 

ADDITIONAL INFORMATION
I would really love to have this feature in Okular as due to my work I have to
read a lot of material every day, and this scrolling mode helps me reading
faster. I've done a prototype, and it works for me, but as I'm not a
professional C++/Qt developer the code quality is poor. Also I don't have
enough time recently to continue working on it. There are some improvement I'd
like to add to my current prototype (apart from using proper C++ and
performance optimizations), such as: create visual controls for scrolling speed
in auto-scroll mode, preserve original scrolling behavior and make on/off
switch for new behavior in View menu.

By submitting this feature request I hope that it will help seeing the
resonance  and feedbacks from other users, and, if not being assigned for
implementation to some experienced okular developer, than at least helping me
find somebody who would be able to cooperate with me on implementing this.

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