java - 在哪里设置 VERTICAL_SCROLLBAR_​​NEVER？

Question

我对 Java 很陌生，所以请慢慢来。经过大量研究后，我相信我明白 JScrollPane 选项默认显示滚动条。我正在尝试改变一些现有代码中的这种行为。我相信只需使用 VERTICAL_SCROLLBAR_​​NEVER 更改默认值即可。但是，我很难确定它在代码中的位置。有人可以帮我看看这个属性的设置位置吗(或者我是否走在正确的轨道上)？

这是我认为与这个问题相关的代码段。分割 Pane 窗口的右侧有一个滚动条。我想永久隐藏它。

public class LauncherFrame extends JFrame {

    private final Launcher launcher;

    @Getter
    private final InstanceTable instancesTable = new InstanceTable();
    private final InstanceTableModel instancesModel;
    @Getter
    private final JScrollPane instanceScroll = new JScrollPane(instancesTable);
    private WebpagePanel webView;
    private JSplitPane splitPane;
    private final JButton launchButton = new JButton(SharedLocale.tr("launcher.launch"));
    private final JButton refreshButton = new JButton(SharedLocale.tr("launcher.checkForUpdates"));
    private final JButton optionsButton = new JButton(SharedLocale.tr("launcher.options"));
    private final JButton selfUpdateButton = new JButton(SharedLocale.tr("launcher.updateLauncher"));
    private final JCheckBox updateCheck = new JCheckBox(SharedLocale.tr("launcher.downloadUpdates"));

    public LauncherFrame(@NonNull Launcher launcher) {
        super(tr("launcher.title", launcher.getVersion()));

        this.launcher = launcher;
        instancesModel = new InstanceTableModel(launcher.getInstances());

        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(new Dimension(615, 322));
        setResizable(false);
        initComponents();
        setLocationRelativeTo(null);

        SwingHelper.setFrameIcon(this, Launcher.class, "icon.png");

        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                loadInstances();
            }
        });
    }

    private void initComponents() {
        JPanel container = createContainerPanel();
        container.setLayout(new MigLayout("fill, insets dialog", "[][]push[][]", "[grow][]"));

        webView = createNewsPanel();
        splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, instanceScroll, webView);
        selfUpdateButton.setVisible(launcher.getUpdateManager().getPendingUpdate());

        launcher.getUpdateManager().addPropertyChangeListener(new PropertyChangeListener() {
            @Override
            public void propertyChange(PropertyChangeEvent evt) {
                if (evt.getPropertyName().equals("pendingUpdate")) {
                    selfUpdateButton.setVisible((Boolean) evt.getNewValue());

                }
            }
        });

        updateCheck.setSelected(true);
        instancesTable.setModel(instancesModel);
        launchButton.setFont(launchButton.getFont().deriveFont(Font.BOLD));
        splitPane.setDividerLocation(100);
        splitPane.setDividerSize(4);
        splitPane.setOpaque(false);
        container.add(splitPane, "grow, wrap, span 5, gapbottom unrel, w null:680, h null:350");
        SwingHelper.flattenJSplitPane(splitPane);
        container.add(refreshButton);
        container.add(updateCheck);
        container.add(selfUpdateButton);
        container.add(optionsButton);
        container.add(launchButton);

        add(container, BorderLayout.CENTER);
    }

* 更新 *

尝试了下面的建议，但仍然看到滚动条。我将窗口更改为可调整大小 true，以便缩小尺寸时您可以更轻松地看到它。

Answer 1

您可以将滚动条策略传递到 the constructor当您创建新的滚动 Pane 时。

private final JScrollPane instanceScroll = new JScrollPane(instancesTable, 
                           ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER, 
                           ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);

或者您可以保留构造函数调用不变，并在 initComponents() 方法中设置策略(例如)。

instanceScroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);