如何使用自定義JTable單元格編輯器和單元格渲染器

Question

我創建了一個帶有自定義表格渲染和自定義單元格編輯器的JTable，它可以在圖像中顯示結果

我使用擴展JPanel的單獨類創建了第一個表格單元格中顯示的面板。 並將表值添加為，

        tbl.setCellEditor(new customCell());
        tbl.getColumnModel().getColumn(0).setCellRenderer(new customCell());

        DefaultTableModel dtm = (DefaultTableModel) tbl.getModel();

        Vector v = new Vector();
        v.add(new Panel());
        v.add("Test");
        dtm.addRow(v);

        v.clear();
        v.add(new Panel());
        v.add("Test 2");
        dtm.addRow(v);

這是我的表自定義類來創建這個表，

class customCell extends DefaultTableModel implements TableCellRenderer, TableCellEditor {

        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
            Panel p = new Panel();            
            table.setRowHeight(row, p.getHeight());
            return p;
        }

        public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {

            return new Panel();
        }

        public Object getCellEditorValue() {
            return "";
        }

        public boolean isCellEditable(EventObject anEvent) {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        public boolean shouldSelectCell(EventObject anEvent) {
            return true;
        }

        @Override
        public boolean isCellEditable(int rowIndex, int columnIndex) {
            return true;
        }

        public boolean stopCellEditing() {
            return true;
        }

        public void cancelCellEditing() {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        public void addCellEditorListener(CellEditorListener l) {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        public void removeCellEditorListener(CellEditorListener l) {
            throw new UnsupportedOperationException("Not supported yet.");
        }
    }

我的問題被認為是面板顯示為我預期我無法輸入文本字段或更改復選框或單擊按鈕。 請告訴我如何解決這個問題。

Answer 1

我強烈建議重用默認表格渲染器和編輯器中提供的功能，因為您的代碼有很多問題

1. 請拆分編輯器，渲染器和表格模型。 將它們全部放在同一個類中只是很奇怪
2. 對於渲染器，不要每次都創建Component新實例。 相反，重用相同的組件，只需在getTableCellRendererComponent方法中修改該Component
3. 編輯器Component
4. 擴展默認編輯器，而不是使用UnsupportedOperationException實現方法，或者只返回空String

為了支持我的觀點，請參閱JTable教程中的編輯部分 ：

如果要指定除文本字段，復選框或組合框之外的編輯器，該怎么辦？ 由於DefaultCellEditor不支持其他類型的組件，因此您必須多做一些工作。 您需要創建一個實現TableCellEditor接口的類。 AbstractCellEditor類是一個很好用的超類。 它實現了TableCellEditor的超接口CellEditor，為您節省了實現單元編輯器所需的事件觸發代碼的麻煩。

您的單元格編輯器類需要至少定義兩個方法 - getCellEditorValue和getTableCellEditorComponent。 CellEditor所需的getCellEditorValue方法返回單元格的當前值。 TableCellEditor所需的getTableCellEditorComponent方法應配置並返回要用作編輯器的組件。

正如在那里清楚解釋的那樣，你必須實現事件激發碼：

為您節省了實現單元格編輯器所需的事件觸發代碼的麻煩。

你明顯忽略了。 因此，我建議從AbstractCellEditor開始，而不是從頭開始實現接口

Answer 2

必須為已經可見的JPanel添加適當的LayoutManager ， Editable/non_Editable屬性

讓我們享受

import java.awt.*;
import java.awt.event.*;
import java.util.EventObject;
import javax.swing.*;
import javax.swing.table.*;

public class PanelInTable {

    private JFrame frame;
    private JTable compTable = null;
    private PanelTableModel compModel = null;
    private JButton addButton = null;

    public static void main(String args[]) {
        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
            //UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception fail) {
        }
        SwingUtilities.invokeLater(() -> {
            new PanelInTable().makeUI();
        });
    }

    public void makeUI() {
        compTable = CreateCompTable();
        JScrollPane CompTableScrollpane = new JScrollPane(compTable, 
                JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        JPanel bottomPanel = CreateBottomPanel();
        frame = new JFrame("Comp Table Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(CompTableScrollpane, BorderLayout.CENTER);
        frame.add(bottomPanel, BorderLayout.SOUTH);
        frame.setPreferredSize(new Dimension(800, 400));
        frame.setLocation(150, 150);
        frame.pack();
        frame.setVisible(true);
    }

    public JTable CreateCompTable() {
        compModel = new PanelTableModel();
        compModel.addRow();
        JTable table = new JTable(compModel);
        table.setRowHeight(new CompCellPanel().getPreferredSize().height);
        table.setTableHeader(null);
        PanelCellEditorRenderer PanelCellEditorRenderer = new PanelCellEditorRenderer();
        table.setDefaultRenderer(Object.class, PanelCellEditorRenderer);
        table.setDefaultEditor(Object.class, PanelCellEditorRenderer);
        return table;
    }

    public JPanel CreateBottomPanel() {
        addButton = new JButton("Add Comp");
        addButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {
                Object source = ae.getSource();
                if (source == addButton) {
                    compModel.addRow();
                }
            }
        });
        JPanel panel = new JPanel(new GridBagLayout());
        panel.add(addButton);
        return panel;
    }
}

class PanelCellEditorRenderer extends AbstractCellEditor implements 
        TableCellRenderer, TableCellEditor {

    private static final long serialVersionUID = 1L;
    private CompCellPanel renderer = new CompCellPanel();
    private CompCellPanel editor = new CompCellPanel();

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, 
            boolean isSelected, boolean hasFocus, int row, int column) {
        renderer.setComp((Comp) value);
        return renderer;
    }

    @Override
    public Component getTableCellEditorComponent(JTable table, Object value, 
            boolean isSelected, int row, int column) {
        editor.setComp((Comp) value);
        return editor;
    }

    @Override
    public Object getCellEditorValue() {
        return editor.getComp();
    }

    @Override
    public boolean isCellEditable(EventObject anEvent) {
        return true;
    }

    @Override
    public boolean shouldSelectCell(EventObject anEvent) {
        return false;
    }
}

class PanelTableModel extends DefaultTableModel {

    private static final long serialVersionUID = 1L;

    @Override
    public int getColumnCount() {
        return 1;
    }

    public void addRow() {
        super.addRow(new Object[]{new Comp(0, 0, "", "")});
    }
}

class Comp {

    public int type;
    public int relation;
    public String lower;
    public String upper;

    public Comp(int type, int relation, String lower, String upper) {
        this.type = type;
        this.relation = relation;
        this.lower = lower;
        this.upper = upper;
    }
}

class CompCellPanel extends JPanel {

    private static final long serialVersionUID = 1L;
    private JLabel labelWith = new JLabel("With ");
    private JComboBox typeCombo = new JComboBox(new Object[]
    {"height", "length", "volume"});
    private JComboBox relationCombo = new JComboBox(new Object[]
    {"above", "below", "between"});
    private JTextField lowerField = new JTextField();
    private JLabel labelAnd = new JLabel(" and ");
    private JTextField upperField = new JTextField();
    private JButton removeButton = new JButton("remove");

   public CompCellPanel() {
        setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
        relationCombo.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                enableUpper(relationCombo.getSelectedIndex() == 2);
            }
        });
        enableUpper(false);
        removeButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                JTable table = (JTable) SwingUtilities.getAncestorOfClass(
                        JTable.class, (Component) e.getSource());
                int row = table.getEditingRow();
                table.getCellEditor().stopCellEditing();
                ((DefaultTableModel) table.getModel()).removeRow(row);
            }
        });
        add(labelWith);
        add(typeCombo);
        add(relationCombo);
        add(lowerField);
        add(labelAnd);
        add(upperField);
        add(Box.createHorizontalStrut(100));
        add(removeButton);
    }

    private void enableUpper(boolean enable) {
        labelAnd.setEnabled(enable);
        upperField.setEnabled(enable);
    }

    public void setComp(Comp Comp) {
        typeCombo.setSelectedIndex(Comp.type);
        relationCombo.setSelectedIndex(Comp.relation);
        lowerField.setText(Comp.lower);
        upperField.setText(Comp.upper);
        enableUpper(Comp.relation == 2);
    }

    public Comp getComp() {
        return new Comp(typeCombo.getSelectedIndex(), 
                relationCombo.getSelectedIndex(), 
                lowerField.getText(), upperField.getText());
    }
}