java - 滚动条在表格单元格内不起作用

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让它发挥作用的东西滚动条根本没有移动

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，您将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;
        }

    }
}

请注意，我从本地资源读取了整个 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 Pane 使用了鼠标滚轮事件