突出显示jtable中的单元格

小编典典

突出显示jtable中的单元格

java

我有此代码从如何突出显示jtable中的多个单元格：

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，当我用它突出显示一个单元格时，它会执行错误的操作，就像丢失整个数据一样。Iam是Java
Swing的新手。请帮助使单元格在按钮按下动作事件中突出显示。
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）。

阅读 254

2020-11-30

共1个答案

小编典典

我使用此类来设置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;
}

创建此类的实例，并将其应用于需要设置样式的单元格。您可以使用isSelected参数编辑单元格突出显示颜色。

编辑

感谢您更新的示例，这是一个用于更改单元格渲染器的切换按钮的示例

首先使用默认的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();
}

希望这可以帮助

编辑我添加了一个重新绘制以清理最后一个示例。如果您只想定位特定的单元格，请更改表格单元格渲染器以仅渲染所需的单元格，如下所示

    @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;
}

2020-11-30