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Add comments to functions

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This commit is contained in:
schroda
2025-02-05 15:15:27 +01:00
parent 34ebcc4f4c
commit 5e8b5545a6
1 changed files with 98 additions and 0 deletions
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98
src/modules/reader/hooks/useReaderInfiniteScrollUpdateChapter.ts
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@@ -27,6 +27,11 @@ interface ElementIntersectionInfo {
const OPEN_CHAPTER_INTERSECTION_RATIO = 0.1;
/**
* Returns info about if the start or end of an element is intersecting.
*
* The info is mapped to the ReadingMode since depending on the selected mode, the start and end of the element changes
*/
const getElementIntersectionInfo = (
readingDirection: ReadingDirection,
{ top, right, bottom, left }: DOMRect,
@@ -79,6 +84,99 @@ const getElementIntersection = (
return horizontalInfo;
};
/**
* Will change the chapter to the previous or next one depending on the intersection of the first or last page.
*
* For the initial load of the previous chapter, the intersection of the first page is used, after the initial load
* of the previous chapter the intersection of the last page handles changing the chapter
*
* @example
* How it works:
* |, _ = viewport
* # = page
*
* initial open previous chapter (start of first page intersecting, chapter of page is current chapter, previous chapter not yet loaded):
*
* vertical pager:
* |----------------|
* | | ↑
* | | ↑ Scroll direction: backward
* | ####### | ↑
* |----#######-----|
* #######
* #######
*
* horizontal pager (ltr):
* |----------------|
* | ######## ←
* | ######## ← Scroll direction: backward
* | ######## ←
* |----------------|
*
* horizontal pager (rtl):
* |----------------|
* ######## | →
* ######## | → Scroll direction: backward
* ######## | →
* |----------------|
*
*
*
*
* open previous chapter (chapter of intersecting page) (end of last page intersecting):
*
* vertical pager:
* #######
* #######
* |----#######-----|
* | ####### | ↑
* | | ↑ Scroll direction: backward
* | | ↑
* |________________|
*
* horizontal pager (ltr):
* |----------------|
* ######## | ←
* ######## | ← Scroll direction: backward
* ######## | ←
* |----------------|
*
* horizontal pager (rtl):
* |----------------|
* | ######## →
* | ######## → Scroll direction: backward
* | ######## →
* |----------------|
*
*
*
*
* open next chapter (end of last page intersecting):
*
* vertical pager:
* #######
* #######
* |----#######-----|
* | ####### | ↓
* | | ↓ Scroll direction: forward
* | | ↓
* |________________|
*
* horizontal pager (ltr):
* |----------------|
* ######## | →
* ######## | → Scroll direction: forward
* ######## | →
* |----------------|
*
* horizontal pager (rtl):
* |----------------|
* | ######## ←
* | ######## ← Scroll direction: forward
* | ######## ←
* |----------------|
*
*/
export const useReaderInfiniteScrollUpdateChapter = (
pageType: 'first' | 'last',
chapterId: number,