Enable fast scroll for file browser

[guanglinn]

Enable fast scroll for RecyclerView, the scrollbar will also be revealed in the file browser.

[guanglinn]

scrollbar-file-browser.mp4

[harshad1]

So we have these classes already:

https://github.com/gsantner/markor/blob/master/app/src/main/java/net/gsantner/markor/web/DraggableScrollbarWebView.java

Perhaps we should just repurpose this logic?

[guanglinn]

Thank you for your prompt. These codes are very useful and I should reuse them. I may need to override RecyclerView.

[guanglinn]

But the RecyclerView already has built-in fast scroll, and I have used it, it works well. Is it necessary to override this class? This may cause redundant code. I think it may be unnecessary.

[harshad1]

Ok. Just wanted to show you that code in case it makes sense to reuse it. If it does not then it does not

[guanglinn]

Thanks for your guidance, which lets me have a better understanding of this project's code.

[guanglinn]

Hi, @gsantner . Do you prefer hex color values in lowercase or uppercase.

[gsantner]

I prefer uppercase for hexdecimal. But there is no need to refactor any predefined colors when they are not upper.

[guanglinn]

This PR is ready to be merged now.

[gsantner]

Thanks, the scroll track works as expected.

Though - @harshad1 @guanglinn : the scrolling feel s very sluggish now. There were a lot of changes to the scrolling including i.e. threadexecutor, which might be an delay/sync issue. It feels quite bad 😄

[gsantner]

@guanglinn
the scrolling and filebrowser feel very sluggish now. If I didn't know any better, I would say there is some while(true) in the UI thread running.

Also another finding, the file/folder blinks when browsing files. I.e. go to subfolder and up again, and the file is highlighted again and again.

[guanglinn]

@gsantner
It works well on my device. Could you add a screen recording here.

I will try to resolve these issues as soon as possible.

[gsantner]

• The total sluggish is not always the case, sometimes it's really slow and also the tab switcher (bottom bar) takes a bit to switch around.
• Upon new creation, there is a short blink of it, and then the text stays unreadable
• Also see the blink often running very quick, so it blinks like 15 times quickly in a second

Some impressions

screen-20240329-004203.mp4

screen-20240329-003534.mp4

[gsantner]

Thank you very much for implementing (and wanting to improve it)