java - GridPane 的 LayoutY 不受 ScrollBar Listener 影响

Question

我有一个动态填充的GridPane，然后显示它，问题是:如果行太多，那么底部的行不会显示，我想要的是添加一个滚动条，以便我可以显示所有行，这是代码，但它不起作用:

BudgetManager bManager = new BudgetManager();
    List<Debt> debts = bManager.getDebts();
    GridPane topLevel = new GridPane();
    topLevel.setAlignment(Pos.TOP_CENTER);
    int row = 0;
    double totatB = 0, totalS = 0;

    for (Debt d : debts) {
        //fill GridPane
    }

    ScrollBar sc = new ScrollBar();
    sc.setMin(0);
    sc.setMax(350);
    sc.setVisibleAmount(20);
    sc.setOrientation(Orientation.VERTICAL);
    sc.setUnitIncrement(10);
    sc.setBlockIncrement(50);
    sc.setPrefWidth(20);
    sc.valueProperty().addListener((ObservableValue<? extends Number> ov, Number old_val, Number new_val) -> {
            topLevel.setLayoutY(-new_val.doubleValue());
        }
    });
    HBox box = new HBox();
    box.getChildren().addAll(topLevel, sc);
    HBox.setHgrow(topLevel, Priority.ALWAYS);

    Scene scene = new Scene(box, 1200, 600);
    stage.setScene(scene);
    stage.show();

已解决 这是解决方案，感谢 keuleJ，使用 ScrollPane 而不是 ScrollBar:

    ScrollPane scroll = new ScrollPane();
    GridPane topLevel = new GridPane();

    scroll.setContent(topLevel);
    scroll.setHbarPolicy(ScrollBarPolicy.ALWAYS);
    scroll.setVbarPolicy(ScrollBarPolicy.AS_NEEDED);
    scroll.setFitToWidth(true);
    scroll.setFitToHeight(true);

    Scene scene = new Scene(scroll, 1200, 600); // Manage scene size

Answer 1

使用 fitToWidth 或 fitToHeight 属性。

查看文档: https://docs.oracle.com/javafx/2/api/javafx/scene/control/ScrollPane.html