Bug 415594

Summary:	Horizontal Mouse Wheel Scrolling (i.e. shitf+scroll) in Windows
Product:	[Applications] okular	Reporter:	James Flynn <my-kde>
Component:	PDF backend	Assignee:	Okular developers <okular-devel>
Status:	RESOLVED UPSTREAM
Severity:	minor	CC:	nate
Priority:	NOR
Version:	1.8.2
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description James Flynn 2019-12-26 23:43:44 UTC

SUMMARY
Attempting to use the built-in Windows horizontal scroll function (holding shift then scrolling with a mouse wheel) results in vertical scrolling.

STEPS TO REPRODUCE
1. Open a PDF Document
2. Zoom until the document is able to be scrolled horizontally
3. Hold "Shift" Key and use mouse scroll wheel

OBSERVED RESULT
Document scrolls vertically.

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: Windows 10
(available in About System)
KDE Frameworks Version: 5.63.0
Qt Version: 5.13.1

ADDITIONAL INFORMATION
Horizontal Scrolling in Windows is a known pain to deal with, so it is likely something in the windows-specific connections in the port for Okular that the issue is being introduced. 

I have not yet verified if touchpad 2-finger scrolling allows for horizontal scrolling (which is the case in some programs with this issue, ie Excel).

In fact, it is possible that the dll patching methods that users have put together for Excel (see the OfficeScroll project here: https://github.com/T800G/OfficeScroll) could give an indicator of how to easily allow for this to be fixed.

Comment 1 Nate Graham 2020-01-01 23:37:15 UTC

In Qt apps (all of them, not just KDE apps), it's Alt+scroll, not Shift+scroll.

Yes, this is different from how it is in native Windows and macOS apps, both of which use Shift+scroll. Yes, this is annoying. It annoys me too. However if it's to be changed, it would need to be done in Qt itself, not in Okular. If you'd like to pursue the matter further, please file a bug for the Qt developers at https://bugreports.qt.io/ and add it to the "URL" field of this bug report. Thanks!

Comment 2 James Flynn 2020-02-19 15:51:13 UTC

Apologies for the *very* late response, but just wanted to say thank you for pointing out this functionality to me. I had not been able to surface this in my searching, so while I will attempt to follow up with the QT developers, in the meantime this will be a great workaround for me.