滚动条在表格单元格中不起作用

Question

同时使用单元格渲染器和编辑器，但滚动条仍然不起作用 请建议任何使它起作用的东西 滚动条根本不动

类 MultiRowCell 扩展 AbstractCellEditor 实现 TableCellEditor、TableCellRenderer {

        private JScrollPane scrollPane;
        private JTextArea textArea;

        public MultiRowCell() {
            textArea = new JTextArea();
            textArea.setEditable(true);
            scrollPane = new JScrollPane(textArea);
        }

        @Override
        public boolean isCellEditable(EventObject e) {
            System.out.println(e);
            return true;
        }

        @Override
        public Object getCellEditorValue() {
            return textArea.getText();
        }

        protected void setCellValue(Object value) {
            if (value == null) {
                textArea.setText(null);
            } else {
                textArea.setText(value.toString());
            }
            textArea.setCaretPosition(0);
        }

        @Override
        public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
            setCellValue(value);
            return scrollPane;
        }

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            setCellValue(value);
            return scrollPane;
        }

    }
    //TextTableCellRenderer tr=new TextTableCellRenderer();
    //table.getColumnModel().getColumn(1).setCellEditor(tr);
    MultiRowCell re=new MultiRowCell();
    table.getColumnModel().getColumn(1).setCellRenderer(re);
    table.getColumnModel().getColumn(1).setCellEditor(re);
    //table.getColumnModel().getColumn(1).setCellRenderer(r); 
    //table.getColumnModel().getColumn(1).setCellEditor(e);
    //table.getColumnModel().getColumn(2).setCellRenderer(r); 
    //table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    panel.setLayout(new BorderLayout());
    panel.add(table, BorderLayout.CENTER);
    panel.add(table.getTableHeader(), BorderLayout.NORTH);

    return panel;

Answer 1

从概念上讲，您需要一个单元格渲染器和单元格编辑器才能使其工作，例如...

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.EventQueue;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.EventObject;
import javax.swing.AbstractCellEditor;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            setLayout(new BorderLayout());

            String text = loadText();
            String[][] data = new String[1][1];
            data[0][0] = text;

            DefaultTableModel model = new DefaultTableModel(data, new String[]{"Example"});
            JTable table = new JTable(model);
            TableColumnModel columnModel =table.getColumnModel();
            TableColumn column = columnModel.getColumn(0);
            MultiRowCell multiRowCell = new MultiRowCell();
            column.setCellEditor(multiRowCell);
            column.setCellRenderer(multiRowCell);

            int height = multiRowCell.getTableCellRendererComponent(table, "Test", true, true, 0, 0).getPreferredSize().height;
            table.setRowHeight(height);

            add(new JScrollPane(table));
        }

        protected String loadText() {
            StringBuilder sb = new StringBuilder(1024);
            try (BufferedReader reader = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("Script.txt")))) {
                String text = null;
                while ((text = reader.readLine()) != null) {
                    sb.append(text).append(System.lineSeparator());
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            return sb.toString();
        }

    }


    public class MultiRowCell extends AbstractCellEditor implements TableCellEditor, TableCellRenderer {

        private JScrollPane scrollPane;
        private JTextArea textArea;

        public MultiRowCell() {
            textArea = new JTextArea(25, 50);
            textArea.setEditable(false);
            scrollPane = new JScrollPane(textArea);
        }

        @Override
        public boolean isCellEditable(EventObject e) {
            System.out.println(e);
            return true;
        }

        @Override
        public Object getCellEditorValue() {
            return textArea.getText();
        }

        protected void setCellValue(Object value) {
            if (value == null) {
                textArea.setText(null);
            } else {
                textArea.setText(value.toString());
            }
            textArea.setCaretPosition(0);
        }

        @Override
        public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
            setCellValue(value);
            return scrollPane;
        }

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            setCellValue(value);
            return scrollPane;
        }

    }
}

注意，我从本地资源中阅读了整个 Rouge One 脚本作为示例，您需要提供自己的文本

警告：此示例将要求您单击单元格以切换到编辑模式，因为包装JTable 的滚动窗格使用了鼠标滚轮事件