From b443b37a1110866db1352cf201f14f1916cd217b Mon Sep 17 00:00:00 2001
From: Catalin Mititiuc
Date: Mon, 22 Apr 2024 11:43:31 -0700
Subject: Update storing pan & zoom changes to localStorage
---
src/index.js | 38 ++++++++++++++++----------------------
1 file changed, 16 insertions(+), 22 deletions(-)
diff --git a/src/index.js b/src/index.js
index 84001d4..cb746f4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,36 +2,31 @@ import { pan, zoom } from 'svg-pan-zoom';
import Game from './modules/game.js';
const PanZoom = new function () {
- const vb = 'viewBox';
- let svg;
+ const storageKey = 'pan-zoom';
- function storeViewBoxVal() {
- localStorage.setItem(vb, svg.getAttribute(vb));
+ function storePanZoomVal(transformMatrix) {
+ localStorage.setItem(storageKey, transformMatrix);
}
- function observeViewBoxChanges() {
- const observer = new MutationObserver(mutations => {
- if (mutations.find(m => m.target == svg && m.attributeName == vb)) {
- storeViewBoxVal(svg);
- }
- });
+ function observePanZoomChanges(svg) {
+ const observer = new MutationObserver(() => storePanZoomVal(svg.style.transform));
- observer.observe(svg, { attributes: true });
+ observer.observe(svg, { attributeFilter: ['style'] });
}
- function restoreViewBoxVal() {
- const storedVbVal = localStorage.getItem(vb);
+ function restorePanZoomVal(svg) {
+ const storedPanZoomVal = localStorage.getItem(storageKey);
- if (storedVbVal) {
- svg.setAttributeNS(null, vb, storedVbVal);
+ if (storedPanZoomVal) {
+ svg.style.transform = storedPanZoomVal;
}
}
- function addEventListeners() {
+ function addEventListeners(svg) {
svg.addEventListener('wheel', e => {
e.preventDefault();
- svg.setAttributeNS(null, vb, zoom(svg, e));
+ zoom(svg, e);
}, { passive: false });
svg.addEventListener('pointerdown', e => {
@@ -41,11 +36,10 @@ const PanZoom = new function () {
}, { passive: false });
}
- this.start = function (el) {
- svg = el;
- restoreViewBoxVal();
- addEventListeners();
- observeViewBoxChanges();
+ this.start = function (svg) {
+ restorePanZoomVal(svg);
+ addEventListeners(svg);
+ observePanZoomChanges(svg);
};
};
--
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