突出显示 jtable 中的单元格

Question

我有这个来自 stackoverflow how to highlight multiple cells in jtable 的代码：

private static class CellHighlighterRenderer extends JLabel implements TableCellRenderer {

    public CellHighlighterRenderer() {
        setOpaque(true); // Or color won't be displayed!
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        String val = (String)value;
        Color c;
        if (val.matches(".*MIN.*")) // Add a method to configure the regexpr
            c = Color.YELLOW; // Add a method to configure color
        else
            c = UIManager.getColor("Table.background");
        setBackground(c);
        setText(val);
        return this;
    }
}

但是当我使用它来突出显示一个单元格时，它会给出错误的操作，就像整个数据丢失一样。我是 java swing 新手。请帮助在按钮按下操作事件中突出显示单元格。
更新：添加我的示例代码：

package myPackage;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import javax.swing.table.TableCellRenderer;

public class JTableCreatingDemo {
    public static void main(String args[]) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Object rowData[][] = { { "Row1-Column1"},
        { "Row2-Column1" } ,{ "Row3-Column1"},{ "Row4-Column1"},};
    Object columnNames[] = { "Column One" };
    final JTable table = new JTable(rowData, columnNames);
    JButton button = new JButton("Highlight cell-1");
    //Add action listener to button
    button.addActionListener(new ActionListener() {

            @Override
        public void actionPerformed(ActionEvent arg0) {
         table.setDefaultRenderer(Object.class, new CellHighlighterRenderer()); 
        }
    });    
    JPanel pnl = new JPanel();
    pnl.add(button);
    JScrollPane scrollPane = new JScrollPane(table);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.add(pnl,BorderLayout.SOUTH);
    frame.setSize(300, 150);
    frame.setVisible(true);

  }
}

class CellHighlighterRenderer extends JLabel implements TableCellRenderer {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public CellHighlighterRenderer() {
        setOpaque(true); // Or color won't be displayed!
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        String val = (String)value;
        Color c;
        if (isSelected) // Add a method to configure the regexpr
            c = Color.YELLOW; // Add a method to configure color
        else
            c = UIManager.getColor("Table.background");
        setBackground(c);
        setText(val);
        return this;
    }
}

我想要的是单击按钮，我只想突出显示单元格编号 1（Row1-Column1）。

Answer 1

我使用这个类来设置 JTables 的样式

public class CellRenderer extends DefaultTableCellRenderer {

@Override
public Component getTableCellRendererComponent(JTable table, Object obj, boolean isSelected, boolean hasFocus, int row, int column) {
    Component cell = super.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, column);

    if (isSelected)
        cell.setBackground(Color.YELLOW);
    else if (column == 0)
        cell.setBackground(new Color(0xDDDDD));
    else 
        cell.setBackground(new Color(0xFFFFFF));

    return cell;
}

创建此类的一个实例并将其应用到您需要设置样式的单元格中。 您可以使用 isSelected 参数来编辑单元格高亮颜色。

编辑

感谢您更新的示例，这是用于更改单元格渲染器的切换按钮示例

首先使用默认表格单元格渲染器为单元格创建颜色样式

public class CellHighlighterRenderer extends DefaultTableCellRenderer {

@Override
public Component getTableCellRendererComponent(JTable table, Object obj,
        boolean isSelected, boolean hasFocus, int row, int column) {

    Component cell = super.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, column);

    cell.setBackground(Color.YELLOW);

    return cell;
}

创建您的 JFrame 并添加 JTable 和按钮

public class Main extends JFrame {

public Main() {
    super("Table Demo");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setPreferredSize(new Dimension(300, 300));
    setLocationRelativeTo(null);
    setLayout(new BorderLayout());

    DefaultTableModel model = new DefaultTableModel();
    model.setColumnCount(5);
    model.setRowCount(5);

    JTable table = new JTable();
    table.setModel(model);

    //Get an instance of the column and the style to apply and hold a default style instance
    final TableColumn column = table.getColumnModel().getColumn(1);
    final CellHighlighterRenderer cellRenderer = new CellHighlighterRenderer();
    final TableCellRenderer defaultRenderer = column.getCellRenderer();

    //Now in your button listener you can toggle between the styles 
    JButton button = new JButton("Click!");
    button.addActionListener(new ActionListener() {
        private boolean clicked = false;

        @Override
        public void actionPerformed(ActionEvent e) {

            if (clicked) {
                column.setCellRenderer(cellRenderer);
                clicked = false;
            } else {
                column.setCellRenderer(defaultRenderer);
                clicked = true;
            }
            repaint(); //edit
        }
    });

    getContentPane().add(table, BorderLayout.CENTER);
    getContentPane().add(button, BorderLayout.NORTH);
    pack();
    setVisible(true);
}

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

希望对你有帮助

编辑 我添加了重绘来清理最后一个示例。如果您只想定位特定单元格，请将表格单元格渲染器更改为仅渲染您需要的单元格

    @Override
public Component getTableCellRendererComponent(JTable table, Object obj,
        boolean isSelected, boolean hasFocus, int row, int column) {

    Component cell = super.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, column);

    //add condition for desired cell
    if (row == 1 && column == 1)
        cell.setBackground(Color.YELLOW);

    return cell;
}

Answer 2

有多种方法可以实现这一点，在您非常特殊的情况下，您想要突出显示特定的行和列，您可以使用...

class CellHighlighterRenderer extends DefaultTableCellRenderer {

    private static final long serialVersionUID = 1L;

    public CellHighlighterRenderer() {
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        if (row == 0 && column == 0) {
            setBackground(Color.YELLOW);
            setOpaque(true);
        } else {
            setBackground(table.getBackground());
            setOpaque(isSelected);
        }
        return this;
    }
}

现在，如果你想突出显示整行，你可以替换

if (row == 0 && column == 0) {

有

if (row == 0) {

渲染器更难掌握的概念之一是需要在每次迭代时完全重置组件的状态。基本上这意味着，不假设已为当前迭代正确设置属性，并确保您未使用的默认值...

查看Using Custom Renderers了解更多详情...

Answer 3

你可以试试这个：

一、表中代码：

HighlightCellRenderer renderer = new HighlightCellRenderer();
table.setDefaultRenderer(String.class, renderer);
table.setDefaultRenderer(Number.class, renderer);
table.setDefaultRenderer(Boolean.class, renderer);
table.setDefaultRenderer(Character.class, renderer);

然后：

公共类 HighlightCellRenderer 扩展 DefaultTableCellRenderer {

@Override
public Component getTableCellRendererComponent(JTable table, Object obj, boolean isSelected, boolean hasFocus,
        int row, int column) {
    Component cell = super.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, column);

    if (row == table.getSelectedRow()) {
        if (column == table.getSelectedColumn()) {
            // special color
            cell.setBackground(Color.GREEN);
        } else {
            // The selected row color in "com.jtattoo.plaf.aero.AeroLookAndFeel"                
            cell.setBackground(new Color(176, 196, 222)); 
        }
    } else {
        // Other rows
        cell.setBackground(Color.WHITE);
    }

    return cell;
}

}

Answer 4

您可以尝试不同的方法，而不是使用单元格渲染器，您可以像这样手动选择 JTable 单元格

    table.setCellSelectionEnabled(true); //Enable single cell selection

    table.addRowSelectionInterval(1, 1); // select rows
    table.setColumnSelectionInterval(1, 1); // select columns