fix(pickers): adding logic for date editor/picker, slowing scroll down further

Author: ChronosSF

projects/igniteui-angular/src/lib/directives/date-time-editor/date-time-editor.directive.ts

@@ -229,7 +229,10 @@ export class IgxDateTimeEditorDirective extends IgxMaskDirective implements OnCh
     @Output()
     public validationFailed = new EventEmitter<IgxDateTimeEditorEventArgs>();
 
+
+    private readonly SCROLL_THRESHOLD = 50;
     private _inputFormat: string;
+    private _scrollAccumulator = 0;
     private _displayFormat: string;
     private _oldValue: Date;
     private _dateValue: Date;
@@ -314,10 +317,14 @@ export class IgxDateTimeEditorDirective extends IgxMaskDirective implements OnCh
         }
         event.preventDefault();
         event.stopPropagation();
-        if (event.deltaY > 0) {
-            this.decrement();
-        } else {
-            this.increment();
+        this._scrollAccumulator += event.deltaY;
+        if (Math.abs(this._scrollAccumulator) > this.SCROLL_THRESHOLD) {
+            if (this._scrollAccumulator < 0) {
+                this.decrement();
+            } else {
+                this.increment();
+            }
+            this._scrollAccumulator = 0;
         }
     }
 

projects/igniteui-angular/src/lib/time-picker/time-picker.directives.ts

@@ -34,7 +34,7 @@ export class IgxItemListDirective implements OnInit, OnDestroy {
 
     public isActive: boolean;
 
-    private readonly SCROLL_THRESHOLD = 15;
+    private readonly SCROLL_THRESHOLD = 50;
     private readonly PAN_THRESHOLD = 10;
 
     /**