From d9af8199e6064459952e97426703ed3f5fa99569 Mon Sep 17 00:00:00 2001
From: Andrew Bagshaw <abagshaw@hotmail.ca>
Date: Tue, 5 Dec 2017 13:07:58 -0800
Subject: [PATCH] Switch to ResizeObserver from window onresize

---
 package.json  |  2 ++
 src/salieo.js | 29 ++++++++++++++++++++++-------
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/package.json b/package.json
index 872db44..c835993 100644
--- a/package.json
+++ b/package.json
@@ -10,10 +10,12 @@
     "devDependencies": {
         "browserify": "^14.5.0",
         "cropcalc-js": "^0.9.3",
+        "debounce": "^1.1.0",
         "mkdirp": "^0.5.1",
         "pixelmatch": "^4.0.2",
         "pngjs": "^3.3.1",
         "puppeteer": "^0.13.0",
+        "resize-observer-polyfill": "^1.5.0",
         "tap-spec": "^4.1.1",
         "tape": "^4.8.0",
         "uglify-js": "^3.2.1"
diff --git a/src/salieo.js b/src/salieo.js
index 013a8c6..e8bb166 100644
--- a/src/salieo.js
+++ b/src/salieo.js
@@ -1,8 +1,13 @@
 var cropcalcJS = require("cropcalc-js");
+var debounce = require("debounce");
+var ResizeObserverPolyfill = require("resize-observer-polyfill");
+
+var ResizeObserver = ResizeObserver ? ResizeObserver : ResizeObserverPolyfill;
 
 function salieo(userOptions) {
     var loadedImages = [];
     var salieoDataCache = {};
+    var ro;
 
     var options = {
         img_class: "salieo",
@@ -18,15 +23,13 @@ function salieo(userOptions) {
         window.addEventListener("message", triggerEditMode);
     }
 
-    setOpts(options, userOptions);
-    refresh();
-
     if(options.watch_resize) {
-        window.addEventListener('resize', function(event) {
-            refresh();
-        });
+        ro = new ResizeObserver(debounce(refresh, 10));
     }
 
+    setOpts(options, userOptions);
+    refresh();
+
     //Handy to use functions
     function setOpts(standard, user) {
         if (typeof user === 'object') {
@@ -264,6 +267,10 @@ function salieo(userOptions) {
     }
 
     function refresh() {
+        if(ro) {
+            ro.disconnect();
+        }
+
         var rawElements = document.getElementsByClassName(options.img_class);
         var newSalieoDataCache = {};
         var tmpImgInfo, currentImage;
@@ -271,6 +278,10 @@ function salieo(userOptions) {
         loadedImages = [];
 
         for(var i = 0; i < rawElements.length; i++) {
+            if(ro) {
+                ro.observe(rawElements[i]);
+            }
+
             tmpImgInfo = getElementURL(rawElements[i]);
             if(!tmpImgInfo) {
                 continue; //Error getting image URL
@@ -298,11 +309,15 @@ function salieo(userOptions) {
         var avoidElements = document.getElementsByClassName(options.avoid_class);
         var avoidAreas = [];
         for(var i = 0; i < avoidElements.length; i++) {
+            if(ro) {
+                ro.observe(avoidElements[i]);
+            }
+
             avoidAreas.push({elementRect: avoidElements[i].getBoundingClientRect(), dataset: avoidElements[i].dataset});
         }
 
         var tmpElementRect;
-        for(var i = 0; i < loadedImages.length; i++) {  
+        for(var i = 0; i < loadedImages.length; i++) {
             loadedImages[i].elementRect = loadedImages[i].element.getBoundingClientRect();
             loadedImages[i].cropOptions = Object.create(options.crop_options);