java - 使 ScrollPane 适合其在 javafx 中的父级

Question

我想调整 ScrollPane 的大小以适应其父容器。我测试了这段代码:

    @Override
    public void start(Stage stage) throws Exception {

        VBox vb = new VBox();
        vb.setPrefSize(600, 600);
        vb.setMaxSize(600, 600);

        ScrollPane scrollPane = new ScrollPane();
        scrollPane.setFitToHeight(false);
        scrollPane.setFitToWidth(false);

        scrollPane.setHbarPolicy(ScrollBarPolicy.AS_NEEDED);
        scrollPane.setVbarPolicy(ScrollBarPolicy.AS_NEEDED);

        VBox vb2 = new VBox();

        vb.getChildren().add(scrollPane);
        scrollPane.getChildren().add(vb2);

        Scene scene = new Scene(vb);

        stage.setScene(scene);
        stage.show();
    }

现在我想让 scrollPane 的宽度和高度与外部 VBox(vb) 相同。但是我失败了!有人可以帮帮我吗？

Answer 1

首先不要这样做:

vb.getChildren().add(vb);

将 VBox 'vb' 添加到自身将导致异常并且没有任何意义 :D

其次使用 AnchorPane 并像这样设置 ScrollPane 的约束:

//Create a new AnchorPane
AnchorPane anchorPane = new AnchorPane();

//Put the AnchorPane inside the VBox
vb.getChildren().add(anchorPane);

//Fill the AnchorPane with the ScrollPane and set the Anchors to 0.0
//That way the ScrollPane will take the full size of the Parent of
//the AnchorPane (here the VBox)
anchorPane.getChildren().add(scrollPane);
AnchorPane.setTopAnchor(scrollPane, 0.0);
AnchorPane.setBottomAnchor(scrollPane, 0.0);
AnchorPane.setLeftAnchor(scrollPane, 0.0);
AnchorPane.setRightAnchor(scrollPane, 0.0);
//Add content ScrollPane
scrollPane.getChildren().add(vb2);