How to switch chapters directly in Epub navigator?

[hhhtutu]

Is there any way to switch to the previous chapter directly in Epub navigator, instead of goBackward and goForward to switch to the previous page and the next page?

[mickael-menu]

Not out of the box but here are some extensions on Navigator you can use (warning: I wrote this quickly and didn't test it out):

public suspend fun Navigator.goToPreviousResourceIn(readingOrder: List<Link>): Boolean {
    val previousLocator =
        readingOrder.indexOfFirstWithHref(currentLocator.value.href)
            ?.let { readingOrder.getOrNull(it - 1) }
            ?: return false

    return go(previousLocator)
}

public suspend fun Navigator.goToNextResourceIn(readingOrder: List<Link>): Boolean {
    val nextLocator =
        readingOrder.indexOfFirstWithHref(currentLocator.value.href)
            ?.let { readingOrder.getOrNull(it + 1) }
            ?: return false

    return go(nextLocator)
}

Then call

navigator.goToNextResourceIn(publication.readingOrder)

This is such a common use case that we will probably add some helpers for that at some point.

[hhhtutu]

Thanks