reader.spine
The reader.spine reference: whether the pages describe the latest layout requested.
The reference for reader.spine, the spine items laid out one after the other.
Layout
Section titled “Layout”.isLayoutCurrent$
Section titled “.isLayoutCurrent$”Observable<boolean>Whether the pages describe the latest layout requested. Replays the current value on subscription, then emits each time it changes.
It turns false the moment a layout is requested, before anything is done for
it:
- by
reader.layout(), and what calls it, such as a resize or a setting that moves the pages; - by a spine item that finishes loading, fails to load or finishes unloading.
It turns true once the pages of the latest request are published, before
anything else hears of them. A newer request cancels everything still running
for older ones, so the pages that make the layout current are the ones it asked
for. It is false until the first pages are published.
Read it before you use where a page is: while it is false, the pages describe
the layout before the request. A spine item's place in the spine does not wait
for them: it is replaced once the items are laid out. Neither does a spine
item's isDirty: a layout clears it as soon as it lays that item out, long
before the pages are computed again. For the latest navigation with whether it
holds on this layout, read
reader.navigation.navigationAgainstCurrentLayout$.
It completes when the reader is destroyed.
.isLayoutCurrent
Section titled “.isLayoutCurrent”booleanThe current value of .isLayoutCurrent$.