dragScroll

package test;import javafx.animation.KeyFrame;import javafx.animation.Timeline;import javafx.application.Application;import javafx.geometry.Orientation;import javafx.scene.Node;import javafx.scene.Scene;import javafx.scene.input.MouseEvent;import javafx.scene.input.ScrollEvent;import javafx.scene.control.Label;import javafx.scene.control.ScrollBar;import javafx.scene.control.ScrollPane;import javafx.scene.input.ClipboardContent;import javafx.scene.input.DragEvent;import javafx.scene.input.Dragboard;import javafx.scene.input.TransferMode;import javafx.scene.layout.BorderPane;import javafx.scene.layout.VBox;import javafx.stage.Stage;import javafx.util.Duration;
public class dragdrop extends Application {
    private ScrollPane sp;    private Timeline scrolltimeline = new Timeline();    private double scrollVelocity = 0;
    boolean dropped;
    //Higher speed value = slower scroll.    int speed = 200;
    @Override    public void start(Stage primaryStage) throws Exception {
        BorderPane root = new BorderPane();
        sp = new ScrollPane();        sp.setPrefSize(300, 300);        sp.setStyle("-fx-background-color:red");
        VBox outer = new VBox(sp);
        VBox innerBox = new VBox();        innerBox.setPrefSize(2000,1000);
        sp.setContent(innerBox);
        root.setCenter(outer);
        Label dragMe = new Label("drag me to edge!\n"+"or drop me in scrollpane!");        root.setTop(dragMe);
        setupScrolling();
        dragMe.setOnDragDetected((MouseEvent event) ->{
            Dragboard db = dragMe.startDragAndDrop(TransferMode.ANY);            db.setDragView(((Node) event.getSource()).snapshot(null, null));
            ClipboardContent content = new ClipboardContent();            content.putString((dragMe.getText()));
            db.setContent(content);            event.consume();        });

        Scene scene = new Scene(root, 640, 480);        primaryStage.setScene(scene);        primaryStage.show();    }

    private void setupScrolling() {
        //set timeline        scrolltimeline.setCycleCount(Timeline.INDEFINITE);        scrolltimeline.getKeyFrames().add(new KeyFrame(Duration.millis(20), (ActionEvent) -> { dragScroll();}));
        sp.setOnDragExited((DragEvent event) -> {

            //set vận tốc            if (event.getY() > 0) {
                scrollVelocity = 1.0 / speed;            }
            else {
                scrollVelocity = -1.0 / speed;
            }

//            if (event.getX() > 300) {//                scrollVelocity = 1.0 / speed;//            }//            else {//                scrollVelocity = -1.0 / speed;//            }            if (!dropped){
                scrolltimeline.play();            }

        });
        sp.setOnDragEntered(event -> {
            scrolltimeline.stop();            dropped = false;        });        sp.setOnDragDone(event -> {
            System.out.print("test");            scrolltimeline.stop();        });        sp.setOnDragDropped((DragEvent event) ->{
            Dragboard db = event.getDragboard();            ((VBox) sp.getContent()).getChildren().add(new Label(db.getString()));            scrolltimeline.stop();            event.setDropCompleted(true);            dropped = true;

        });
        sp.setOnDragOver((DragEvent event) ->{
            event.acceptTransferModes(TransferMode.MOVE);        });

        sp.setOnScroll((ScrollEvent event)-> {
            scrolltimeline.stop();        });
        sp.setOnMouseClicked((MouseEvent)->{
            System.out.println(scrolltimeline.getStatus());
        });
    }
    private void dragScroll() {
        //ScrollBar sb = getVerticalScrollbar();        ScrollBar sb = getHORIZONTALScrollbar();
        if (sb != null) {
            double newValue = sb.getValue() + scrollVelocity;            newValue = Math.min(newValue, 1.0);            newValue = Math.max(newValue, 0.0);            sb.setValue(newValue);        }
    }

    private ScrollBar getVerticalScrollbar() {
        ScrollBar result = null;        for (Node n : sp.lookupAll(".scroll-bar")) {
            if (n instanceof ScrollBar) {
                ScrollBar bar = (ScrollBar) n;                if (bar.getOrientation().equals(Orientation.VERTICAL)) {
                    result = bar;                }
            }
        }
        return result;    }
    private ScrollBar getHORIZONTALScrollbar() {
        ScrollBar result = null;        for (Node n : sp.lookupAll(".scroll-bar")) {
            if (n instanceof ScrollBar) {
                ScrollBar bar = (ScrollBar) n;                if (bar.getOrientation().equals(Orientation.HORIZONTAL)) {
                    result = bar;                }
            }
        }
        return result;    }

    public static void main(String[] args) {
        launch(args);    }

}