Can Epub support direct chapter switching by scrolling up and down?

[hhhtutu]

When setting Epub scroll to true, can we support scrolling directly to turn chapters instead of swiping left and right to switch chapters?

[qnga]

That is a feature of the new navigator we should release a beta version of in the coming months.

[qnga]

Feedback from your team mate's prototype would be welcome. Which components does he use? How does he prevent scrolling over a resource that has not been completely loaded yet?

[peter-bookshop]

@qnga, sorry for the delayed response.

I built the iOS prototype from scratch, so it doesn’t use any components from the Readium libraries yet. It simply loads HTML from a local extracted EPUB asset.

It’s implemented using a collection view, where each chapter is displayed in a web view embedded within a collection view cell. The cell height is determined by running a script in the web view after the content finishes loading.

Each cell has a minimum height equal to the device height, and content is loaded in the collection view delegate’s willDisplay method. This approach seems to work well - scrolling is smooth, and not all chapters are loaded at once. It even works when the last chapter is programmatically navigated to and you scroll backwards.

Happy to share the prototype code if you'd like to take a look.

[mickael-menu]

Hi @peter-bookshop. Sure we would be interested in seeing your prototype and see if it's an approach that could be useful in Readium! Are you on the Readium Slack? If not, please share a link to a hosted archive here or send it to me via email (mickael.menu at Gmail). Thank you!

[peter-bookshop]

@mickael-menu I sent you an invite to the repo.

[mickael-menu]

Thank you Peter, I'll take a look.