与线程相关Jtable as a Jtree Node我将 JTable 放入 JTree，但 JTree View 在启动时未正确呈现，我如何为 JTable setPreferredSize，因为 PreferredScrollableViewportSize 收缩 JTable 渲染 TableHeader + 一个 Row，一个 Row 保持隐藏，但在展开 Node 之后(s) TreeRenderer 更改并重新绘制 setPreferredSize 到预期的 Dimension

import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.tree.*;

public class TreeWithTableRenderer extends JFrame {

    private static final long serialVersionUID = 1L;
    private JTree tree;

    public TreeWithTableRenderer() {
        DefaultMutableTreeNode AA1 = new DefaultMutableTreeNode("AA1");
        DefaultMutableTreeNode AA2 = new DefaultMutableTreeNode("AA2");
        DefaultMutableTreeNode A = new DefaultMutableTreeNode("A");
        A.add(AA1);
        A.add(AA2);
        DefaultMutableTreeNode BB1 = new DefaultMutableTreeNode("BB1");
        DefaultMutableTreeNode BB2 = new DefaultMutableTreeNode("BB2");
        DefaultMutableTreeNode B = new DefaultMutableTreeNode("B");
        B.add(BB1);
        B.add(BB2);
        DefaultMutableTreeNode CC1 = new DefaultMutableTreeNode("CC1");
        DefaultMutableTreeNode CC2 = new DefaultMutableTreeNode("CC2");
        DefaultMutableTreeNode C = new DefaultMutableTreeNode("C");
        C.add(CC1);
        C.add(CC2);
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
        root.add(A);
        root.add(B);
        root.add(C);
        tree = new JTree(root);
        tree.setCellRenderer(new MyTableInTreeCellRenderer());
        tree.setRowHeight(0);
        JScrollPane jsp = new JScrollPane(tree);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        add(jsp, BorderLayout.CENTER);
        pack();
        setLocationRelativeTo(null);
    }

    class MyTableInTreeCellRenderer extends JPanel implements TreeCellRenderer {

        private static final long serialVersionUID = 1L;
        private JTable table;

        public MyTableInTreeCellRenderer() {
            super(new BorderLayout());
            table = new JTable();
            JScrollPane scrollPane = new JScrollPane(table);
            add(scrollPane);
        }

        public Component getTreeCellRendererComponent(JTree tree, Object value,
                boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
            final String v = (String) ((DefaultMutableTreeNode) value).getUserObject();
            table.setModel(new DefaultTableModel() {

                private static final long serialVersionUID = 1L;

                @Override
                public int getRowCount() {
                    return 2;
                }

                @Override
                public int getColumnCount() {
                    return 2;
                }

                @Override
                public Object getValueAt(int row, int column) {
                    return v + ":" + row + ":" + column;
                }
            });
            table.setPreferredScrollableViewportSize(table.getPreferredSize());
            return this;
        }
    }

    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                new TreeWithTableRenderer().setVisible(true);
            }
        });
    }
}

最佳答案

摆脱 scrollPane，无论如何它都无法正常工作(到目前为止我同意 Russell :-) 并使用适当的 LayoutManager 将表格及其标题添加到面板:

public MyTableInTreeCellRenderer() {
    super();
    setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
    table = new JTable();
    add(table.getTableHeader());
    add(table);
}

您可能需要稍微调整一下视觉效果，缺少左侧和顶部边框线 - 不完全确定哪个组件正常绘制它们，可能是 scrollPane

编辑

忘记了:在计算渲染组件所需的大小(在ui委托(delegate)中完成，即VariableHeightLayoutCache)时查询scrollPane的prefSize的原因是scrollPane还没有配置header。查询发生在面板被添加到 rendererPane 之前，完整的配置在表的 addNotify 中完成，它仅在面板添加到层次结构之后发生

关于java - 将 JTable 放入 JTree 中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8843638/