所以我有一个带有复选框的 JTable。我希望复选框在“选中”时包含一个图像，在“未选中”时包含另一图像（即显示图像而不是选中或未选中的框）。有没有办法做到这一点？我尝试过使用 TableCellRenderer 返回带有 ImageIcon 的 JLabel，但它并不是非常有效。
更具体地说，当选中或取消选中该框时，会出现正确的图像，但是当用户更改复选框状态（按下鼠标时）时，会出现原始选中/未选中的图像
这是我尝试过的TableCellRenderer（我也尝试过使用JPanels，但这也无效
public class CrassusEventTableCellEyeRenderer extends JCheckBox implements TableCellRenderer {
static Icon greyEye;
static Icon blackEye;
{//STATIC CODE BLOCK
try {
greyEye = new ImageIcon(ImageIO.read(new File("icons/shittyTest.png")));
blackEye = new ImageIcon(ImageIO.read(new File("icons/blackEye.png")));
} catch (IOException e) {
greyEye = null;
blackEye = null;
}
}
public CrassusEventTableCellEyeRenderer(){
super();
this.addItemListener(new IsCheckedItemListener());
setIcon(greyEye);
}
//commented out code that I have tried in place of the IsCheckedItemListener
/*
@Override
public void setSelected(boolean sel){
super.isSelected();
if(sel)
setIcon(blackEye);
else
setIcon(greyEye);
}
*/
public class IsCheckedItemListener implements ItemListener{
@Override
public void itemStateChanged(ItemEvent e) {
if(isSelected())
setIcon(blackEye);
else
setIcon(greyEye);
}
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
System.out.println("value: "+value+", row: "+row+", column: "+column);
if(value instanceof Boolean){
setSelected(((Boolean) value).booleanValue());
}
return this;
}
}
您需要提供自己的定制TableCellRenderer能够提供您想要的功能...
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;
public class TestTableRenderer {
public static void main(String[] args) {
new TestTableRenderer();
}
public TestTableRenderer() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
TableModel model = new AbstractTableModel() {
@Override
public int getRowCount() {
return 2;
}
@Override
public int getColumnCount() {
return 1;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return rowIndex == 0 ? true : false;
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return Boolean.class;
}
};
JTable table = new JTable(model);
table.setDefaultRenderer(Boolean.class, new CustomBooleanCellRenderer());
setLayout(new BorderLayout());
add(new JScrollPane(table));
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
public class CustomBooleanCellRenderer extends JCheckBox implements TableCellRenderer {
private ImageIcon sad;
private ImageIcon happy;
public CustomBooleanCellRenderer() {
try {
happy = new ImageIcon(ImageIO.read(getClass().getResource("/Happy.png")));
sad = new ImageIcon(ImageIO.read(getClass().getResource("/Sad.png")));
} catch (IOException ex) {
Logger.getLogger(TestTableRenderer.class.getName()).log(Level.SEVERE, null, ex);
}
}
@Override
public void setSelected(boolean selected) {
super.setSelected(selected);
if (selected) {
setIcon(happy);
} else {
setIcon(sad);
}
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (value instanceof Boolean) {
boolean selected = (boolean) value;
setSelected(selected);
}
return this;
}
}
}
现在，您可以轻松地使用JLabel or DefaultTableCellRenderer， 检查Object价值true/false并相应地设置图标...但是其中的乐趣在哪里;)
更新以包括编辑器...
我稍微重新排列了代码以包含单元格编辑器......
public class CustomCheckBox extends JCheckBox {
private ImageIcon sad;
private ImageIcon happy;
public CustomCheckBox() {
try {
happy = new ImageIcon(ImageIO.read(getClass().getResource("/Happy.png")));
sad = new ImageIcon(ImageIO.read(getClass().getResource("/Sad.png")));
} catch (IOException ex) {
ex.printStackTrace();
}
}
@Override
public void setSelected(boolean selected) {
super.setSelected(selected);
if (selected) {
setIcon(happy);
} else {
setIcon(sad);
}
}
}
public class CustomBooleanCellRenderer extends CustomCheckBox implements TableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (value instanceof Boolean) {
boolean selected = (boolean) value;
setSelected(selected);
}
return this;
}
}
public class CustomBooleanCellEditor extends AbstractCellEditor implements TableCellEditor {
private CustomCheckBox editor;
public CustomBooleanCellEditor() {
editor = new CustomCheckBox();
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
if (value instanceof Boolean) {
boolean selected = (boolean) value;
editor.setSelected(selected);
}
return editor;
}
@Override
public Object getCellEditorValue() {
return editor.isSelected();
}
}
您可以以与渲染器类似的方式应用...
table.setDefaultEditor(Boolean.class, new CustomBooleanCellEditor());