[英]JComboBox on cell of JTable
我有一個JTable對象,我會在單列上添加5個不同的JComboBox。
我已經嘗試過了:
table.getColumnModel().getColumn(3).setCellEditor(new DefaultCellEditor(jcombo));
但這會向該列的所有單元格添加相同的JComboBox。 如何在同一列上添加不同的內容?
謝謝!
基本上,您需要根據行來修改組合框正在使用的模型。
下面的示例允許您為給定的行指定ComboBoxModel
,並提供一個默認的ComboBoxModel
,當未為該行指定一個時。
一般而言,每一列應該是相同的類型...
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.HashMap;
import java.util.Map;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultCellEditor;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
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.DefaultTableModel;
public class TestCombo {
public static void main(String[] args) {
new TestCombo();
}
public TestCombo() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
DefaultTableModel model = new DefaultTableModel(new Object[]{"Stuff"}, 5);
JTable table = new JTable(model);
table.setGridColor(Color.LIGHT_GRAY);
MyComboBoxCellEditor editor = new MyComboBoxCellEditor();
editor.setModelForRow(0, new DefaultComboBoxModel(new Object[]{"Banana", "Peach", "Pear"}));
editor.setModelForRow(1, new DefaultComboBoxModel(new Object[]{"Dog", "Cat", "T-Rex"}));
editor.setModelForRow(2, new DefaultComboBoxModel(new Object[]{"Car", "Truck", "Hovercraft"}));
editor.setModelForRow(3, new DefaultComboBoxModel(new Object[]{"Helicopter", "Plane", "Rocket"}));
editor.setModelForRow(4, new DefaultComboBoxModel(new Object[]{"PC", "Mac", "Linux"}));
table.getColumnModel().getColumn(0).setCellEditor(editor);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class MyComboBoxCellEditor extends DefaultCellEditor {
private ComboBoxModel defaultModel;
private Map<Integer, ComboBoxModel> mapModels;
public MyComboBoxCellEditor() {
super(new JComboBox());
mapModels = new HashMap<>(25);
defaultModel = new DefaultComboBoxModel();
}
public void setDefaultModel(ComboBoxModel model) {
defaultModel = model;
}
public void setModelForRow(int row, ComboBoxModel model) {
mapModels.put(row, model);
}
public ComboBoxModel getDefaultModel() {
return defaultModel;
}
public ComboBoxModel getModelForRow(int row) {
return mapModels.get(row);
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
JComboBox comboBox = (JComboBox) getComponent();
ComboBoxModel model = getModelForRow(row);
if (model == null) {
model = getDefaultModel();
}
comboBox.setModel(model);
return super.getTableCellEditorComponent(table, value, isSelected, row, column); //To change body of generated methods, choose Tools | Templates.
}
}
}
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