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perf: optimize ResizeObserver to only observe necessary element

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Change ResizeObserver from observing document.body (too broad) to only
observing the segment element. This reduces unnecessary position update
callbacks when unrelated parts of the page resize.
This commit is contained in:
hamki 2026-01-26 17:28:20 +08:00
parent 0068f7cd4d
commit 8a6a348771
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GPG Key ID: 092D4EC7F4DECB68
1 changed files with 5 additions and 2 deletions
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7
web_src/js/features/file-view.ts
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@ -166,11 +166,14 @@ function initSidebarToggle(elFileView: HTMLElement): void {
hideSidebar();
}
// Update sidebar position on resize/scroll to keep aligned with file content
// Update sidebar position on resize to keep aligned with file content
// Only observe the segment element to avoid unnecessary updates from unrelated page changes
const resizeObserver = new ResizeObserver(() => {
updatePosition();
});
resizeObserver.observe(document.body);
if (segment) {
resizeObserver.observe(segment);
}
// Update position using IntersectionObserver instead of scroll event
// This provides better performance and avoids scroll event issues