private double oldScreenY;
public DragWindowHandler(Stage primaryStage) {this.primaryStage = primaryStage;}public void setOnMousePressed(MouseEvent event) {oldStageX = primaryStage.getX();oldStageY = primaryStage.getY();oldScreenX = event.getScreenX();oldScreenY = event.getScreenY();}public void setOnMouseDragged(MouseEvent event) {double offsetX = event.getScreenX() - oldScreenX;double offsetY = event.getScreenY() - oldScreenY;primaryStage.setX(oldStageX + offsetX);primaryStage.setY(oldStageY + offsetY);}}
