java - 使用 GridBagLayout 使 JPanel 子项可滚动

Question

我在使 JPanel 组件可滚动时遇到一些问题...我花了 3 个多小时来实现此功能，但没有成功，这就是为什么我请求您的帮助!

窗口类:

public class Window extends JFrame {
    public Window(String title) {
        super();

        Dimension dimension = IHM.getDimension();

        this.setTitle(title);
        this.setSize(dimension.width, dimension.height);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setMaximumSize(dimension);
        this.setMinimumSize(dimension);
        this.setContentPane(new Container());
        this.setBackground(IHM.getBlue());
        this.pack();
        this.setVisible(true);
    }
}

容器类:

public class Container extends JPanel {
    public static Boolean debug = true;
    private Dimension lastDimension = new Dimension(0, 0);

    public Container() {
        // Layout
        GridBagLayout layout = new GridBagLayout();
        GridBagConstraints gbc = new GridBagConstraints();

        // Panel configurations
        this.setLayout(layout);

        /**
         * HEADER
         */
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.gridheight = 1;

        this.add(new HeaderPanel(), gbc);

        /**
         * LEFT
         */
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.gridwidth = 1;
        gbc.fill = GridBagConstraints.BOTH;

        JPanel leftPanel = new LeftPanel();

        JScrollPane leftPanelScrollable = new JScrollPane(leftPanel);

        leftPanelScrollable.setViewportView(leftPanel);
        leftPanelScrollable.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        leftPanelScrollable.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        leftPanelScrollable.setBounds(10, 10, leftPanel.getWidth() - 50, leftPanel.getHeight() - 50);

        this.add(leftPanelScrollable, gbc);

        // ...
    }
}

还有 leftPanel 类:

public class LeftPanel extends JPanel {
    private static Dimension dimension = new Dimension(IHM.getWidth() / 2, IHM.getHeight() - 220);

    public LeftPanel() {
        this.setPreferredSize(dimension);

        // Add the labels
        this.addLabel();

        // Add the radios
        this.addRadios();

        this.setAutoscrolls(true);
    }
}

请查看屏幕截图，我没有任何滚动条:(

结果如图:

你对这个问题有什么想法吗？提前致谢!

Answer 1

leftPanelScrollable.setBounds(10, 10, leftPanel.getWidth(), leftPanel.getHeight());

这应该会造成损害。上述方法强制 JScrollPane 与底层面板的大小相同。让布局管理器来完成工作。

_{附注我还没有测试过。}

<小时/>

您还应该尝试让您的 JPanel 实现 Scrollable并设置

public boolean getScrollableTracksViewportHeight()

还有

public boolean getScrollableTracksViewportWidth()

返回错误。