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Improvements for scroll gestures

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This commit is contained in:
James Brunton 2025-09-16 16:06:27 +01:00
parent 3755bfde34
commit a67f5199d3
1 changed files with 20 additions and 14 deletions
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14
frontend/src/components/viewer/EmbedPdfViewer.tsx
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@ -62,20 +62,26 @@ const EmbedPdfViewerContent = ({
// Handle scroll wheel zoom
React.useEffect(() => {
let accumulator = 0;
const handleWheel = (event: WheelEvent) => {
// Check if Ctrl (Windows/Linux) or Cmd (Mac) is pressed
if (event.ctrlKey || event.metaKey) {
event.preventDefault();
event.stopPropagation();
// Convert smooth scrolling gestures into discrete notches
accumulator += event.deltaY;
const threshold = 10;
const zoomAPI = window.embedPdfZoom;
if (zoomAPI) {
if (event.deltaY < 0) {
// Scroll up - zoom in
if (accumulator <= -threshold) {
zoomAPI.zoomIn();
} else {
// Scroll down - zoom out
accumulator = 0;
} else if (accumulator >= threshold) {
zoomAPI.zoomOut();
accumulator = 0;
}
}
}