From ce98e325656b8419b80d8c248e0469f3a9708322 Mon Sep 17 00:00:00 2001
From: Catalin Mititiuc
Date: Sat, 27 Apr 2024 15:58:11 -0700
Subject: Rename some files
---
src/modules/pan-zoom.js | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
create mode 100644 src/modules/pan-zoom.js
(limited to 'src/modules/pan-zoom.js')
diff --git a/src/modules/pan-zoom.js b/src/modules/pan-zoom.js
new file mode 100644
index 0000000..86f6727
--- /dev/null
+++ b/src/modules/pan-zoom.js
@@ -0,0 +1,33 @@
+import { pan, zoom } from 'pan-zoom';
+
+const storageKey = 'pan-zoom',
+ zoomFactor = 0.25;
+
+function restorePanZoomVal(svg) {
+ const storedPanZoomVal = localStorage.getItem(storageKey);
+
+ if (storedPanZoomVal) {
+ svg.style.transform = storedPanZoomVal;
+ }
+}
+
+function addEventListeners(svg) {
+ svg.addEventListener('wheel', e => zoom(svg, e, zoomFactor), { passive: false });
+ svg.addEventListener('pointerdown', e => pan(svg, e), { passive: false });
+}
+
+function storePanZoomVal(transformMatrix) {
+ localStorage.setItem(storageKey, transformMatrix);
+}
+
+function observePanZoomChanges(svg) {
+ const observer = new MutationObserver(() => storePanZoomVal(svg.style.transform));
+
+ observer.observe(svg, { attributeFilter: ['style'] });
+}
+
+export function start(svg) {
+ restorePanZoomVal(svg);
+ addEventListeners(svg);
+ observePanZoomChanges(svg);
+}
--
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