--- a/src/dad.js	Sun Sep 15 08:15:23 2024 -0600
+++ b/src/dad.js	Tue Feb 18 17:23:17 2025 -0700
@@ -59,9 +59,13 @@
 					if( dz === dragging )
 						continue;
 					if( isIn(x,y,dz.getBoundingClientRect()) ) {
+						let old = dropzone;
 						dropzone = dz;
-						dad.onEnter(myEvent(event));
-						break;
+						let f = dad.onEnter(myEvent(event));
+						if( f === false )
+							dropzone = old;
+						else
+							break;
 					}
 				}
 			}