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author | crupest <crupest@outlook.com> | 2021-04-13 18:41:07 +0800 |
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committer | crupest <crupest@outlook.com> | 2021-04-13 18:41:07 +0800 |
commit | fe83d46e84b728bd374b4adddf1e1426c813e078 (patch) | |
tree | b13fa2b0c1dcf744dd20a0ba4052823b5936f012 /FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts | |
parent | a562777b2a296af27cf3b4cbad7af9b99ee9d353 (diff) | |
download | timeline-fe83d46e84b728bd374b4adddf1e1426c813e078.tar.gz timeline-fe83d46e84b728bd374b4adddf1e1426c813e078.tar.bz2 timeline-fe83d46e84b728bd374b4adddf1e1426c813e078.zip |
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Diffstat (limited to 'FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts')
-rw-r--r-- | FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts b/FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts index 8a2bd7a0..67c7c458 100644 --- a/FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts +++ b/FrontEnd/src/app/utilities/useReverseScrollPositionRemember.ts @@ -7,19 +7,31 @@ export default function useReverseScrollPositionRemember(): void { if (on) return; on = true; - let scrollPosition = - document.documentElement.scrollHeight - - document.documentElement.scrollTop; - + function getScrollPosition(): number { + if (document.documentElement.scrollHeight <= window.innerHeight) { + return 0; + } else { + return ( + document.documentElement.scrollHeight - + document.documentElement.scrollTop - + window.innerHeight + ); + } + } + + let scrollPosition = getScrollPosition(); const scrollListener = (): void => { - scrollPosition = document.documentElement.scrollHeight - window.scrollY; + scrollPosition = getScrollPosition(); }; window.addEventListener("scroll", scrollListener); const resizeObserver = new ResizeObserver(() => { + if (document.documentElement.scrollHeight <= window.innerHeight) return; document.documentElement.scrollTop = - document.documentElement.scrollHeight - scrollPosition; + document.documentElement.scrollHeight - + window.innerHeight - + scrollPosition; }); resizeObserver.observe(document.documentElement); |