dynamic-virtual-scroller - npm Package Compare versions

Comparing version 3.0.4 to 3.0.5

package.json

 {
   "name": "dynamic-virtual-scroller",
-  "version": "3.0.4",
+  "version": "3.0.5",
   "description": "A virtual scroller for the web that can handle dynamic row and column sizes.",
@@ -5,0 +5,0 @@ "main": "virtual-scroller.js",

src/js/VirtualScroller.js

@@ -198,6 +198,25 @@ import {ATTRIBUTES, EVENTS, CLASSES, DATA} from "./constants";
     */
+    var lastScrollTop = 0;
+    var lastScrollLeft = 0;
     var scrollManager = ScrollManager(config, renderManager);
     scrollManager.subscribe(_.throttle(
-        // renderManager might have already been set to null in API.destroy
-        (scrollLeft, scrollTop) => renderManager && renderManager.render(scrollManager),
+        (scrollLeft, scrollTop) => {
+            // renderManager might have already been set to null in API.destroy
+            if (!renderManager) {
+                return;
+            }
+            /*
+                Optimization: Only render if the scroll delta is bigger than a row / column.
+                We can only do this with native scrolling because in the other case
+                renderManager.render() is responsible for the scrolling itself (using css translation).
+            */
+            if (config.useNativeScrolling &&
+                Math.abs(scrollTop - lastScrollTop) <= config.rowHeight &&
+                (!config.renderColumn || Math.abs(scrollLeft - lastScrollLeft) <= config.columnWidth)) {
+                return;
+            }
+            lastScrollTop = scrollTop;
+            lastScrollLeft = scrollLeft;
+            renderManager.render(scrollManager)
+        },
         Math.round(1000 / config.fps),
@@ -204,0 +223,0 @@ {leading: true, trailing: true}

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Improved metrics

Total package byte prevSize

500604

increased by0.29%

Lines of code

6767

increased by0.49%

No dependency changes