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Sliding ctx window for string matching highlighting

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This commit is contained in:
Richard Roberson 2025-01-20 16:36:57 -07:00
parent 28fe51c80d
commit d4b4ad8187
1 changed files with 29 additions and 10 deletions
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39
src/contexts/PDFContext.tsx
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@ -199,7 +199,7 @@ export function PDFProvider({ children }: { children: ReactNode }) {
return bestMatch;
}, []);
// Highlight matching text in the PDF viewer
// Highlight matching text in the PDF viewer with sliding context window
const highlightPattern = useCallback((text: string, pattern: string, containerRef: React.RefObject<HTMLDivElement>) => {
clearHighlights();
@ -215,7 +215,27 @@ export function PDFProvider({ children }: { children: ReactNode }) {
text: (node.textContent || '').trim(),
})).filter((node) => node.text.length > 0);
const bestMatch = findBestTextMatch(allText, cleanPattern, cleanPattern.length * 2);
// Calculate the visible area of the container
const containerRect = container.getBoundingClientRect();
const visibleTop = container.scrollTop;
const visibleBottom = visibleTop + containerRect.height;
// Find nodes within the visible area and a buffer zone
const bufferSize = containerRect.height; // One screen height buffer
const visibleNodes = allText.filter(({ element }) => {
const rect = element.getBoundingClientRect();
const elementTop = rect.top - containerRect.top + container.scrollTop;
return elementTop >= (visibleTop - bufferSize) && elementTop <= (visibleBottom + bufferSize);
});
// Search for the best match within the visible area first
let bestMatch = findBestTextMatch(visibleNodes, cleanPattern, cleanPattern.length * 2);
// If no good match found in visible area, search the entire document
if (bestMatch.rating < 0.3) {
bestMatch = findBestTextMatch(allText, cleanPattern, cleanPattern.length * 2);
}
const similarityThreshold = bestMatch.lengthDiff < cleanPattern.length * 0.3 ? 0.3 : 0.5;
if (bestMatch.rating >= similarityThreshold) {
@ -225,18 +245,17 @@ export function PDFProvider({ children }: { children: ReactNode }) {
});
if (bestMatch.elements.length > 0) {
setTimeout(() => {
const element = bestMatch.elements[0];
const container = containerRef.current;
if (!container || !element) return;
const element = bestMatch.elements[0];
const elementRect = element.getBoundingClientRect();
const elementTop = elementRect.top - containerRect.top + container.scrollTop;
const containerRect = container.getBoundingClientRect();
const elementRect = element.getBoundingClientRect();
// Only scroll if the element is outside the visible area
if (elementTop < visibleTop || elementTop > visibleBottom) {
container.scrollTo({
top: container.scrollTop + (elementRect.top - containerRect.top) - containerRect.height / 2,
top: elementTop - containerRect.height / 3, // Position the highlight in the top third
behavior: 'smooth',
});
}, 100);
}
}
}
}, [clearHighlights, findBestTextMatch]);