gantu · March 21, 2019 05:15 · Mar 21, 2019
diff --git a/MouseScroll.scala b/MouseScroll.scala
@@ -0,0 +1,11 @@
+def addMouseScroll[A](comboBox: JComboBox[A]): Unit = {
+    comboBox.addMouseWheelListener(new MouseAdapter {
+      override def mouseWheelMoved(e: MouseWheelEvent): Unit = {
+        val itemCount = comboBox.getItemCount
+        val index = comboBox.getSelectedIndex + e.getWheelRotation
+        val newIndex = if (index < 0 ) itemCount + index else index % itemCount
+
+        comboBox.setSelectedIndex(newIndex)
+      }
+    })
+  }