Is there any dark mode for this app?

[FraH90]

Hi, first of all this app is the BEST epub reader that I've found for windows. However, I feel the lack of two functionalities that I still haven't found in this app:

• the dark mode, to read ebooks in inverted colors (black background, white text)
• the possibility to highlight text in the books (obviusly storing them on the epub, after the file is closed)

I would love very very much if those functionalities would be added!

[kurema]

Thanks for you suggestion. It sounds to me nice idea to support dark theme for epub viewer. But we have two problem.

• UWP WebView which is based on edgeHTML doesn't seem to support prefers-color-scheme.
• Bibi (the engine of epub reader) does not support dark theme yet (issue).

We plan to move to WinUI 3 / WebView2 (based on Chromium). It will fix the first problem. But it should take some time (maybe in 2022 / WinUI 3 roadmap). About Bibi, it can be difficult. Epub files have its own css and they don't support dark theme in most cases. It is easy to add

@media (prefers-color-scheme: dark) { :root{filter: invert(100%) hue-rotate(180deg);}  }

somewhere but I think it causes numerous problems. Such as

• It does not work correctly if css of the epub file already support dark theme.
• Image can be strange.

In conclusion, we really think it's lovely idea but it should take a time to implement.

[kurema]

I noticed some other small issue for the dark theme. They will be fixed in next release.

[FraH90]

Thanks for you suggestion. It sounds to me nice idea to support dark theme for epub viewer. But we have two problem.

• UWP WebView which is based on edgeHTML doesn't seem to support prefers-color-scheme.
• Bibi (the engine of epub reader) does not support dark theme yet (issue).

We plan to move to WinUI 3 / WebView2 (based on Chromium). It will fix the first problem. But it should take some time (maybe in 2022 / WinUI 3 roadmap). About Bibi, it can be difficult. Epub files have its own css and they don't support dark theme in most cases. It is easy to add

@media (prefers-color-scheme: dark) { :root{filter: invert(100%) hue-rotate(180deg);}  }

somewhere but I think it causes numerous problems. Such as

• It does not work correctly if css of the epub file already support dark theme.
• Image can be strange.

In conclusion, we really think it's lovely idea but it should take a time to implement.

I perfectly get it.. so it's just matter of time, that you move the platform to WebView2 and wait for bibi to implement the dark mode.

And what about the other functionality I mentioned? The possibility to highlights some passages in the epub books?

[kurema]

Sorry, I forgot to mention that. About highlighting, I think it's also an issue of Bibi. I don't think I can do anything to implement (other than creating a pull request. which I won't). There is an issue on Bibi, but it's unlikely.

[kurema]

v3.2.2.0 have the experimental dark mode feature. If you turn on the dark mode for Windows and the option below, you can use dark mode in Epub as default. You can also manually turn on/off.

1. Click here.
2. Here, here and here.
3. Result

I just invoked a small script. This isn't the perfect solution, but it's here for now.

if(document.body.style.background===""){document.body.style.background='white';}
document.body.style.filter='invert(100%) hue-rotate(180deg)';

[kurema]

If you really need the highlight feature, updated Epub.js Reader seems to have it. You can change the Epub engine in the setting.

[FraH90]

Thank you very much! I'll try those features as soon as I'll install v3.2.2.0