feat(core): Enhance scrolling capabilities by integrating Scroller class and adding lenis support

ts/domtools.classes.scroller.ts

@@ -1,5 +1,77 @@
+import type { DomTools } from './domtools.classes.domtools.js';
 import * as plugins from './domtools.plugins.js';
 
 export class Scroller {
-  // TODO: move sweet scroll over to here;
+  public domtoolsInstance: DomTools;
+
+  constructor(
+    domtoolsInstanceArg: DomTools,
+  ) {
+    this.domtoolsInstance = domtoolsInstanceArg;
+  }
+
+  private sweetScroller = new plugins.SweetScroll({
+    /* some options */
+  }); // TODO: switch to scroller class
+
+  public async scrollToElement(
+    elementArg: HTMLElement,
+    optionsArg: Parameters<typeof this.sweetScroller.toElement>[1]
+  ) {
+    this.sweetScroller.toElement(elementArg, optionsArg);
+    await plugins.smartdelay.delayFor(optionsArg.duration);
+  }
+
+  public async detectNativeSmoothScroll() {
+    const done = plugins.smartpromise.defer<boolean>();
+    const sampleSize = 100;
+    const acceptableDeltaDifference = 3;
+    const minimumSmoothRatio = 0.75;
+
+    const eventDeltas: number[] = [];
+
+    function onWheel(event: WheelEvent) {
+      eventDeltas.push(event.deltaY);
+
+      if (eventDeltas.length >= sampleSize) {
+        window.removeEventListener('wheel', onWheel);
+        analyzeEvents();
+      }
+    }
+
+    function analyzeEvents() {
+      const totalDiffs = eventDeltas.length - 1;
+      let smallDiffCount = 0;
+
+      for (let i = 0; i < totalDiffs; i++) {
+        const diff = Math.abs(eventDeltas[i + 1] - eventDeltas[i]);
+        if (diff <= acceptableDeltaDifference) {
+          smallDiffCount++;
+        }
+      }
+
+      const smoothRatio = smallDiffCount / totalDiffs;
+      if (smoothRatio >= minimumSmoothRatio) {
+        console.log('Smooth scrolling detected.');
+        done.resolve(true);
+      } else {
+        console.log('Smooth scrolling NOT detected.');
+        done.resolve(false);
+      }
+    }
+
+    window.addEventListener('wheel', onWheel);
+    return done.promise;
+  }
+
+  public async enableLenisScroll(optionsArg?: { disableOnNativeSmoothScroll?: boolean }) {
+    const lenis = new plugins.Lenis({
+      autoRaf: true,
+    });
+    if (optionsArg?.disableOnNativeSmoothScroll) {
+      if (await this.detectNativeSmoothScroll()) {
+        lenis.destroy();
+      }
+    }
+  }
 }