ComboBox没有在JTable中显示其内容
我想在JTable中显示一个Combobox。对于JTable，我使用TableModel。我已经成功显示了Combobox（而不是它的toString（））。问题是我无法查看其内容。组合框必须是不可编辑的。我已经阅读了很多教程，但我没有找到一个TableModel。我找到了这段代码：
JComboBox comboBox = new JComboBox();
comboBox.addItem("Snowboarding");
comboBox.addItem("Rowing");
comboBox.addItem("Knitting");
comboBox.addItem("Speed reading");
comboBox.addItem("Pool");
comboBox.addItem("None of the above");
sportColumn.setCellEditor(new DefaultCellEditor(comboBox));
//Set up tool tips for the sport cells.
DefaultTableCellRenderer renderer =
new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
sportColumn.setCellRenderer(renderer);
}
我不能用它有两个原因。我的Combobox的内容不一样，他们不使用TableModel。这是我的代码：
public class TProfModel extends DefaultTableModel实现了TableModel {
/**
*
*/
private static final long serialVersionUID = 1L;
private String[] names = { "Nom", "Prénom", "Matière", "Classes" };
private Model model;
public TProfModel(Model model){
this.model = model;
fireTableDataChanged();
}
public Class<?> getColumnClass(int col) {
return getValueAt(0,col).getClass();
}
public int getColumnCount() {
return names.length;
}
public String getColumnName(int col) {
return names[col];
}
public int getRowCount() {
if(model != null)
return model.getProfs().size();
return 0;
}
public Object getValueAt(int line, int col) {
switch (col) {
case 0:
return model.getProfs().get(line).getNom();
case 1:
return model.getProfs().get(line).getPrenom();
case 2:
return model.getProfs().get(line).getMatiere();
case 3:
return getClasses(line);
}
return null;
}
private JComboBox<String> getClasses(int line) {
JComboBox<String> comboBox = new JComboBox<String>();
for(String classe : model.getProfs().get(line).getClasses())
comboBox.addItem(classe);
comboBox.setSelectedIndex(0);
return comboBox;
}
public boolean isCellEditable(int arg0, int arg1) {
if(arg1 == 3)
return false;
return true;
}
public void removeTableModelListener(TableModelListener arg0) {
// TODO Auto-generated method stub
}
@Override
public void setValueAt(Object object, int line, int col) {
switch (col) {
case 0:
model.getProfs().get(line).setNom((String) object);
break;
case 1:
model.getProfs().get(line).setPrenom((String) object);
break;
case 2:
model.getProfs().get(line).setMatiere((String) object);
}
model.writeData();
}
}
2 个答案:
答案 0 :(得分：3)
模型的责任在于提供数据，而不是其他任何东西。编辑和渲染器负责中断数据并最好决定如何显示数据。
传递给编辑器的值是getValueAt的结果，在以下示例的情况下，它只是String，但因为JComboBox具有String已填充import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class TabelEditorExample {
public static void main(String[] args) {
new TabelEditorExample();
}
public TabelEditorExample() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
ShoppingListModel model = new ShoppingListModel();
model.addEntry(new ShoppingEntry(0, null));
model.addEntry(new ShoppingEntry(0, null));
JTable table = new JTable(model);
JComboBox cb = new JComboBox(new String[]{
"Apples",
"Bananas",
"Pears",
"Ice-Cream",
"World Domination",
});
table.
getColumnModel().
getColumn(1).
setCellEditor(new DefaultCellEditor(cb));
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class ShoppingListModel extends AbstractTableModel {
private List<ShoppingEntry> shoppingEntries;
public ShoppingListModel() {
shoppingEntries = new ArrayList<ShoppingEntry>(25);
}
public void addEntry(ShoppingEntry entry) {
shoppingEntries.add(entry);
fireTableRowsInserted(shoppingEntries.size() - 1, shoppingEntries.size() - 1);
}
@Override
public int getRowCount() {
return shoppingEntries.size();
}
@Override
public String getColumnName(int column) {
return column == 0 ? "Qty" : "Item";
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return columnIndex == 0 ? Integer.class : String.class;
}
@Override
public int getColumnCount() {
return 2;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Object value = null;
switch (columnIndex) {
case 0:
value = shoppingEntries.get(rowIndex).getQty();
break;
case 1:
value = shoppingEntries.get(rowIndex).getItem();
break;
}
return value;
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return true;
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
ShoppingEntry entry = shoppingEntries.get(rowIndex);
switch (columnIndex) {
case 0:
int qty = 0;
if (aValue instanceof String) {
qty = Integer.parseInt(aValue.toString());
} else if (aValue instanceof Integer) {
qty = (Integer)aValue;
}
entry.setQty(qty);
break;
case 1:
entry.setItem(aValue == null ? null : aValue.toString());
break;
}
fireTableCellUpdated(rowIndex, columnIndex);
}
}
public class ShoppingEntry {
private int qty;
private String item;
public ShoppingEntry(int qty, String item) {
this.qty = qty;
this.item = item;
}
public String getItem() {
return item;
}
public int getQty() {
return qty;
}
public void setItem(String item) {
this.item = item;
}
public void setQty(int qty) {
this.qty = qty;
}
}
}
值，这将为编辑器提供查找值匹配的功能（如果存在有效匹配）。
您需要做的就是确保编辑器/渲染器知道如何处理来自模型的数据......
setValueAt您还需要覆盖TableModel中的{{1}}并更新它，以便更新您提供的模型中的值。
答案 1 :(得分：3)
您可以覆盖getCellEditor（...）方法以返回其他编辑器。类似的东西：
import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
public class TableComboBoxByRow extends JPanel
{
List<TableCellEditor> editors = new ArrayList<TableCellEditor>(3);
public TableComboBoxByRow()
{
setLayout( new BorderLayout() );
// Create the editors to be used for each row
String[] items1 = { "Red", "Blue", "Green" };
JComboBox<String> comboBox1 = new JComboBox<String>( items1 );
DefaultCellEditor dce1 = new DefaultCellEditor( comboBox1 );
editors.add( dce1 );
String[] items2 = { "Circle", "Square", "Triangle" };
JComboBox<String> comboBox2 = new JComboBox<String>( items2 );
DefaultCellEditor dce2 = new DefaultCellEditor( comboBox2 );
editors.add( dce2 );
String[] items3 = { "Apple", "Orange", "Banana" };
JComboBox<String> comboBox3 = new JComboBox<String>( items3 );
DefaultCellEditor dce3 = new DefaultCellEditor( comboBox3 );
editors.add( dce3 );
// Create the table with default data
Object[][] data =
{
{"Color", "Red"},
{"Shape", "Square"},
{"Fruit", "Banana"},
{"Plain", "Text"}
};
String[] columnNames = {"Type","Value"};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable(model)
{
// Determine editor to be used by row
public TableCellEditor getCellEditor(int row, int column)
{
int modelColumn = convertColumnIndexToModel( column );
if (modelColumn == 1 && row < 3)
return editors.get(row);
else
return super.getCellEditor(row, column);
}
};
JScrollPane scrollPane = new JScrollPane( table );
add( scrollPane );
}
private static void createAndShowUI()
{
JFrame frame = new JFrame("Table Combo Box by Row");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new TableComboBoxByRow() );
frame.setSize(200, 200);
frame.setLocationByPlatform( true );
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}
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