https://docs.oracle.com/en/java/javase/25/docs/api/java.desktop/javax/swing/plaf/basic/BasicSplitPaneDivider.VerticalDragController.html
BasicSplitPaneDivider.VerticalDragController (Java SE 25 & JDK 25)
declaration: module: java.desktop, package: javax.swing.plaf.basic, class: BasicSplitPaneDivider, class: VerticalDragController
java sejdk