java Javafx，滚动窗格，线条滚动不按页面

Question

我有一个可滚动的VBox，里面有很多文本字段。我可以从一个文本字段浏览到下一个文本字段。当我到达最后一个当前可见的页面并再次按TAB键时，滚动窗格切换到下一个“页面”，光标位于新的最上面的文本字段中

但我需要一行一行的滚动行为，同时从文本字段跳到可见区域底部的下一个字段

任何有想法的人

  package test;

  import javafx.application.Application;
  import javafx.scene.Scene;
  import javafx.scene.control.ScrollPane;
  import javafx.scene.control.TextField;
  import javafx.scene.layout.HBox;
  import javafx.scene.layout.VBox;
  import javafx.stage.Stage;

  public class Scroller extends Application {

  @Override
  public void start(Stage primaryStage) {

    VBox vb = new VBox();
    for (int i = 0; i < 360; i++) {
        TextField x = new TextField(String.valueOf(i));
        vb.getChildren().add(x);
    }
    ScrollPane sp = new ScrollPane(vb);
    sp.setVbarPolicy(ScrollPane.ScrollBarPolicy.AS_NEEDED);
    sp.setFitToWidth(true);

    TextField tf = new TextField();
    HBox root = new HBox();
    root.getChildren().addAll(sp, tf);

    Scene scene = new Scene(root, 300, 250);

    primaryStage.setTitle("Hello World!");
    primaryStage.setScene(scene);
    primaryStage.show();
  }

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

Answer 1

内容坐标中顶部的坐标可以确定为

topY = (contentHeight - viewportHeight) * vValue

可以使用此公式和场景的focusedNode属性的侦听器将聚焦节点的底部滚动到视口的底部：

public static boolean isChild(Parent parent, Node node) {
    while (node != null && node != parent) {
        node = node.getParent();
    }
    return parent == node;
}

@Override
public void start(Stage primaryStage) {
    VBox vb = new VBox();
    for (int i = 0; i < 360; i++) {
        TextField x = new TextField(String.valueOf(i));
        vb.getChildren().add(x);
    }
    ScrollPane sp = new ScrollPane(vb);
    sp.setVbarPolicy(ScrollPane.ScrollBarPolicy.AS_NEEDED);
    sp.setFitToWidth(true);

    TextField tf = new TextField();
    HBox root = new HBox();
    root.getChildren().addAll(sp, tf);

    Scene scene = new Scene(root, 300, 250);
    scene.focusOwnerProperty().addListener((o, oldVal, newVal) -> {
        if (isChild(vb, newVal)) {
            // get bounds of focused node in ScrollPane content
            Bounds bounds = newVal.getLayoutBounds();
            while (newVal != vb) {
                bounds = newVal.localToParent(bounds);
                newVal = newVal.getParent();
            }
            double h = vb.getHeight();
            double vH = sp.getViewportBounds().getHeight();

            // scroll node to bottom of the viewport if bottom is not in view
            if (bounds.getMaxY() > sp.getVvalue() * (h - vH) + vH) {
                sp.setVvalue((bounds.getMaxY() - vH) / (h - vH));
            }
        }
    });

    primaryStage.setTitle("Hello World!");
    primaryStage.setScene(scene);
    primaryStage.show();
}