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Menu: Clamp portalled menu position to viewport

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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Alexander Zinchuk 2026-05-15 18:38:07 +02:00
parent bc8111010c
commit d893eaee37
1 changed files with 19 additions and 0 deletions
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19
src/hooks/useMenuPosition.ts
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@ -203,6 +203,25 @@ function processDynamically(
: (x - triggerRect.left)) + addedXForPortalPositioning;
let top = y - triggerRect.top + addedYForPortalPositioning;
// When portalled, `left`/`top` are in viewport coords. The container has width 0 — its anchor
// is the bubble's left edge for `positionX='left'` and right edge for `positionX='right'`
// (same for `top`/`bottom`). Clamp the anchor so the bubble fits the viewport on either side.
if (withPortal) {
const viewportWidth = document.documentElement.clientWidth;
const viewportHeight = document.documentElement.clientHeight;
const margin = MENU_POSITION_VISUAL_COMFORT_SPACE_PX;
if (positionX === 'left') {
left = Math.max(margin, Math.min(left, viewportWidth - menuRect.width - margin));
} else {
left = Math.max(menuRect.width + margin, Math.min(left, viewportWidth - margin));
}
if (positionY === 'top') {
top = Math.max(margin, Math.min(top, viewportHeight - menuRect.height - margin));
} else {
top = Math.max(menuRect.height + margin, Math.min(top, viewportHeight - margin));
}
}
if (isDense) {
left = Math.min(left, rootRect.width - menuRect.width - MENU_POSITION_VISUAL_COMFORT_SPACE_PX);
top = Math.min(top, rootRect.height - menuRect.height - MENU_POSITION_VISUAL_COMFORT_SPACE_PX);