我正在尝试将jRadioButton添加到jTable中。我使用了给定的代码
private class CustomCellRenderer extends DefaultTableCellRenderer {
/* (non-Javadoc)
* @see javax.swing.table.DefaultTableCellRenderer#getTableCellRendererComponent(javax.swing.JTable, java.lang.Object, boolean, boolean, int, int)
*/
@Override
public Component getTableCellRendererComponent(JTable table, Object value,boolean isSelected, boolean hasFocus, int row, int column) {
return new javax.swing.JRadioButton();
}
}
但是当我运行这个时，我会以不同的颜色获得jTable列，当我点击单选按钮时，没有任何反应。我正在使用netbeans。如果我尝试自定义jTable，则jTable中不会显示任何内容。给我一个适当的指导。
答案 0 :(得分：6)
TableCellEditor。JRadioButton并在任何地方重复使用，这就是TableCellRenderer的目的。super.getTableCellRendererComponent，则无需延长DefaultTableCellRenderer，只需实施TableCellRenderer。考虑阅读JTable tutorial以更好地理解渲染器和编辑器的概念。
编辑：
以下是有关如何使其发挥作用的示例。当然，你必须适应你的模型，但你应该得到要点：
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.ArrayList;
import java.util.List;
import javax.swing.AbstractCellEditor;
import javax.swing.JFrame;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
public class TestTable {
public class RadioButtonCellEditorRenderer extends AbstractCellEditor implements TableCellRenderer, TableCellEditor, ActionListener {
private JRadioButton radioButton;
public RadioButtonCellEditorRenderer() {
this.radioButton = new JRadioButton();
radioButton.addActionListener(this);
radioButton.setOpaque(false);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
radioButton.setSelected(Boolean.TRUE.equals(value));
return radioButton;
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
radioButton.setSelected(Boolean.TRUE.equals(value));
return radioButton;
}
@Override
public void actionPerformed(ActionEvent e) {
stopCellEditing();
}
@Override
public Object getCellEditorValue() {
return radioButton.isSelected();
}
}
private JFrame f;
private JTable table;
private class MyObjectManager {
private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
private List<MyObject> objects = new ArrayList<TestTable.MyObject>();
public void addObject(MyObject object) {
objects.add(object);
object.setManager(this);
propertyChangeSupport.firePropertyChange("objects", null, object);
}
public List<MyObject> getObjects() {
return objects;
}
public void setAsSelected(MyObject myObject) {
for (MyObject o : objects) {
o.setSelected(myObject == o);
}
}
}
private class MyObject {
private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
private MyObjectManager manager;
private String value;
private boolean selected;
public MyObject(String value) {
this.value = value;
}
public PropertyChangeSupport getPropertyChangeSupport() {
return propertyChangeSupport;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
propertyChangeSupport.firePropertyChange("value", null, value);
}
public MyObjectManager getManager() {
return manager;
}
public void setManager(MyObjectManager manager) {
this.manager = manager;
propertyChangeSupport.firePropertyChange("manager", null, manager);
}
public boolean isSelected() {
return selected;
}
public void setSelected(boolean selected) {
if (this.selected != selected) {
this.selected = selected;
if (selected) {
manager.setAsSelected(this);
}
propertyChangeSupport.firePropertyChange("selected", !selected, selected);
}
}
}
protected void initUI() {
MyObjectManager manager = new MyObjectManager();
for (int i = 0; i < 200; i++) {
MyObject object = new MyObject("Row " + (i + 1));
manager.addObject(object);
}
table = new JTable(new MyTableModel(manager));
table.setRowHeight(20);
TableColumn column = table.getColumnModel().getColumn(1);
column.setCellEditor(new RadioButtonCellEditorRenderer());
column.setCellRenderer(new RadioButtonCellEditorRenderer());
f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new JScrollPane(table), BorderLayout.CENTER);
f.pack();
f.setVisible(true);
}
public class MyTableModel extends AbstractTableModel implements PropertyChangeListener {
private final MyObjectManager manager;
public MyTableModel(MyObjectManager manager) {
super();
this.manager = manager;
manager.propertyChangeSupport.addPropertyChangeListener(this);
for (MyObject object : manager.getObjects()) {
object.getPropertyChangeSupport().addPropertyChangeListener(this);
}
}
@Override
public void propertyChange(PropertyChangeEvent evt) {
if (evt.getSource() == manager) {
// OK, not the cleanest thing, just to get the gist of it.
if (evt.getPropertyName().equals("objects")) {
((MyObject) evt.getNewValue()).getPropertyChangeSupport().addPropertyChangeListener(this);
}
fireTableDataChanged();
} else if (evt.getSource() instanceof MyObject) {
int index = manager.getObjects().indexOf(evt.getSource());
fireTableRowsUpdated(index, index);
}
}
@Override
public int getColumnCount() {
return 2;
}
@Override
public int getRowCount() {
return manager.getObjects().size();
}
public MyObject getValueAt(int row) {
return manager.getObjects().get(row);
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
switch (columnIndex) {
case 0:
return getValueAt(rowIndex).getValue();
case 1:
return getValueAt(rowIndex).isSelected();
}
return null;
}
@Override
public void setValueAt(Object value, int rowIndex, int columnIndex) {
if (columnIndex == 1) {
getValueAt(rowIndex).setSelected(Boolean.TRUE.equals(value));
}
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return columnIndex == 1;
}
@Override
public Class<?> getColumnClass(int column) {
switch (column) {
case 0:
return String.class;
case 1:
return Boolean.class;
}
return Object.class;
}
@Override
public String getColumnName(int column) {
switch (column) {
case 0:
return "Value";
case 1:
return "Selected";
}
return null;
}
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException,
UnsupportedLookAndFeelException {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new TestTable().initUI();
}
});
}
}
答案 1 :(得分：4)
getTableCellRendererComponent方法中返回新组件。相反，始终返回相同的组件，但根据值进行修改。这是可能的，因为返回的组件仅用作“标记”而不是直接添加到Swing层次结构中。请参阅教程中的Renderers and Editors部分另外，请考虑使用JCheckbox而不是radiobutton。在这种情况下，当TableModel包含boolean值