如何在JavaFx中添加ScrollBar

Question

我正在尝试将一个ScrollBar添加到HBox中.ScrollBar被添加,但我没有滚动.我怎样才能使它工作？

public class ScrollableItems {

    public void scrollableItems(HBox content) {

        double height = 180;

        ScrollBar sc = new ScrollBar();

        content.getChildren().add(sc);

        sc.setLayoutX(content.getWidth() - sc.getWidth());
        sc.setMin(0);
        sc.setOrientation(Orientation.VERTICAL);
        sc.setPrefHeight(height);
        sc.setMax(height * 2);

        sc.valueProperty().addListener(new ChangeListener<Number>() {
            public void changed(ObservableValue<? extends Number> ov,
                    Number old_val, Number new_val) {
                content.setLayoutY(-new_val.doubleValue());
            }
        });
    }
}

将子项添加到HBox然后将其传递到scrollableItems(HBox content)上面以添加SCrollBar

public HBox mainItemsWrapper() {
    HBox scrollabelWrapper = new HBox();
    scrollabelWrapper.setMaxHeight(180);

    HBox entityDetailViewWrapper = new HBox();

    entityDetailViewWrapper.getChildren().addAll(.....);

    scrollabelWrapper.getChildren().add(entityDetailViewWrapper);
    new ScrollableItems().scrollableItems(scrollabelWrapper);

    return scrollabelWrapper;
}

谢谢你们.....

Answer 1

我真的不明白你为什么要重新发明轮子......你应该用它ScrollPane代替.

这个小例子展示了如何用ScrollPane类创建一个可水平滚动的HBox :

@Override
public void start(Stage primaryStage) {

    HBox hbox = new HBox();

    Button b = new Button("add");
    b.setOnAction(ev -> hbox.getChildren().add(new Label("Test")));

    ScrollPane scrollPane = new ScrollPane(hbox);
    scrollPane.setFitToHeight(true);

    BorderPane root = new BorderPane(scrollPane);
    root.setPadding(new Insets(15));
    root.setTop(b);

    Scene scene = new Scene(root, 400, 400);
    primaryStage.setScene(scene);
    primaryStage.show();
}