Autoscroll

[rjbergerud]

• KOReader version: v2015.11-1023-g773e24f
• Device: Kobo Aura One

Issue

It would be great to have an autoscroll feature, especially for those using their device to read music. At minimum, this would include being able to control autoscroll speed. I couldn't find any similar feature requests in the issues.

Steps to reproduce

[pibone]

This could be really interesting, there is an alternative, maybe better for e-ink devices.
Instead (or also 😄) of scrolling, might be useful to implement half page turns.

I guess this feature could be implemented easily.

[Frenzie]

Yes, someone could probably write a plugin relatively easily.

For the GUI you could take a cue from https://github.com/koreader/koreader/blob/db6c35c14476c4f28fdc838ae5f97bccec47ccba/frontend/apps/reader/modules/readersearch.lua

(e.g., slowest, slower/faster in small increments, fastest)

For distance look at

koreader/frontend/apps/reader/modules/readerpaging.lua

Lines 438 to 454 in db6c35c

	function ReaderPaging:onPagingRel(diff)
	if self.view.page_scroll then
	self:onScrollPageRel(diff)
	else
	self:onGotoPageRel(diff)
	end
	self:setPagePosition(self:getTopPage(), self:getTopPosition())
	return true
	end
	function ReaderPaging:onPanningRel(diff)
	if self.view.page_scroll then
	self:onScrollPanRel(diff)
	end
	self:setPagePosition(self:getTopPage(), self:getTopPosition())
	return true
	end

Let me know if you need any more help. :-)

[KenMaltby]

What formats are used for "emusic" files?

[Frenzie]

Either PDF if it's properly digital or some image format (most likely encapsulated in PDF) if it's scanned afaik.

[Evidlo]

I think half page turns would be very useful.

Often when I'm reading a math text, I'll look up a few lines to reference something. With half-page scrolling you can ensure that both pieces of information are on the same screen.

[Frenzie]

@Evidlo You mean half pageturns in autoscroll?

If you mean generically then I'd recommend turning on scroll mode. It's in the menu at the bottom.

That way you can just scroll up or down a little to put something into view with more precision than half page turns would give you.

[Evidlo]

That works, but I find clicking and dragging on eink displays really unpleasant.

I think the ideal solution would be to have an option in the menu to control how much a pageturn operation moves the page. 1 page, 1/2 page, 1/4 page etc.

code in question

[Frenzie]

Does scroll mode automatically horizontally lock the page so that I don't accidentally pan left or right as I drag my finger up?

There are even complaints about it. ;-)

Scrolling works well in KOReader imo: https://vimeo.com/221283896

I think the ideal solution would be to have an option in the menu to control how much a pageturn operation moves the page. 1 page, 1/2 page, 1/4 page etc.

That already exists, although I don't think it's accessible through the menu. See #2818 (comment)

[kobom]

I think it's not duplicate of #4984.

I have serious accessibility problems with turning pages. Is it too hard to develop a next page command that runs at certain times? I don't understand software development. Please help us with accessibility.

So sorry but please help. I'm waiting this feature for months :(

[Frenzie]

@kobom Could you please explain what you mean by it not being a duplicate? If it's about the word scrolling, the only type of "scrolling" that makes sense on E Ink is whole or partial page turns.

Is it too hard to develop a next page command that runs at certain times?

Not too hard, but not easy either. I'll see if I can write a proof of concept today. It's always easier to iterate on something already there.

[Frenzie]

So it's not necessarily the smoothest scroll, but you can get steady scrolling if you use values like 0.5 for time and 0.05 for distance.