add support for mouse wheel to change slide

[nbecker]

Just a feature request, it would be nice to be able to use mouse wheel to go forward/backward

[Cimbali]

There’s a risk of accidentally scrolling a whole lot of slides, no ? If you wrongly touch a trackpad or something like that. Right now you can wheel through slides in preview mode only, i.e. when you press G

[Sargeanthost]

@Cimbali I use the mouse wheel a lot, wouldn't hurt to add a toggle like in preview.

[nbecker]

I've used this in other viewers, such as evince and okular, and it's always worked well. I guess depends on your mouse sensitivity.

…

On Mon, Dec 7, 2020 at 3:12 PM Sargeanthost ***@***.***> wrote: @Cimbali <https://github.com/Cimbali> I use the mouse wheel a lot, wouldn't hurt to add a toggle like in preview. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#179 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAA4VUFY2Y3EDOQJY2ZFIXLSTUZJTANCNFSM4UKX676A> .

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[Cimbali]

Alright, let’s try it and add an option to disable it if it causes issues.

I think there’s some subtleties to fix, as the preview scrolling is based on the number display so right now:

• up = increase page number = advance in document
• down = decrease page number = go back in document

I think that’s counter-intuitive in normal browsing, and we’ll want to have the wheel work the same in both modes.

[Cimbali]

I also see scrolling currently scrolls the annotations by default, if slide editing is not enabled.

[ousia]

I wonder whether clicking on the slide to advance it could be considered as part of this issue.