34 lines
863 B
JavaScript
34 lines
863 B
JavaScript
import { pan, zoom } from 'pan-zoom';
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const storageKey = 'pan-zoom',
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zoomFactor = 0.25;
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function restorePanZoomVal(svg) {
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const storedPanZoomVal = localStorage.getItem(storageKey);
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if (storedPanZoomVal) {
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svg.style.transform = storedPanZoomVal;
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}
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}
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function addEventListeners(svg) {
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svg.addEventListener('wheel', e => zoom(svg, e, zoomFactor), { passive: false });
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svg.addEventListener('pointerdown', e => pan(svg, e), { passive: false });
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}
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function storePanZoomVal(transformMatrix) {
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localStorage.setItem(storageKey, transformMatrix);
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}
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function observePanZoomChanges(svg) {
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const observer = new MutationObserver(() => storePanZoomVal(svg.style.transform));
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observer.observe(svg, { attributeFilter: ['style'] });
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}
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export default function (svg) {
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restorePanZoomVal(svg);
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addEventListeners(svg);
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observePanZoomChanges(svg);
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}
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