我有一个 JTable,其中第一列包含每个单元格中具有相同项目的组合框。如果我在单元格组合框中选择一个项目,我需要从该列中的所有其他组合框中删除所选项目,并添加上一个所选项目到所有其他组合框。我应该怎么做?请帮我举个例子。
public class Save extends JFrame {
String[] items1 = new String[] { "Cash", "Bank1", "Bank2" ,"Bank3"};
TableCellEditor editors;
DefaultTableModel dtmFunds;
private JComboBox comboBox1;
private JTable jtblFunds;
private void loadTable(){
comboBox1=new JComboBox(items1);
comboBox1.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
int x=comboBox1.getSelectedIndex();
comboItem= e.getItem().toString();
}
}
});
editors=new DefaultCellEditor(comboBox1);
dtmFunds = new DefaultTableModel(new Object[][] {{"", " ","delete"}}, new Object[] {"Fund Store", "Amount","Action"});
jtblFunds=new JTable(dtmFunds){
public TableCellEditor getCellEditor(int row,int column){
int modelColumn=convertColumnIndexToModel(column);
if(modelColumn==0 && row<jtblFunds.getRowCount()-1)
return editors;
else
return super.getCellEditor(row,column);
}
};
jtblFunds.setModel(dtmFunds);
jtblFunds.getModel().addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent e) {
int row=e.getFirstRow();
int column=e.getColumn();
if((column==0)&&(row<jtblFunds.getRowCount()-1)){
System.out.println("Dropdown changed "+row);
}
}
});
}
}
这些是我用来将组合框添加到名为“Fund Store”的 JTable 列的代码。
最佳答案
真的,将您的精力集中在 CellEditor
本身,这就是它的工作。无需从 JTable
扩展或随意使用它。
import java.awt.Component;
import java.awt.EventQueue;
import java.util.ArrayList;
import java.util.List;
import javax.swing.AbstractCellEditor;
import javax.swing.DefaultComboBoxModel;
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.DefaultTableModel;
import javax.swing.table.TableCellEditor;
public class TestCellEditor {
public static void main(String[] args) {
new TestCellEditor();
}
public TestCellEditor() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
List<String> values = new ArrayList<>(5);
values.add("Bananas");
values.add("Apples");
values.add("Oranages");
values.add("Grapes");
values.add("Pears");
ComboBoxTableCellEditor editor = new ComboBoxTableCellEditor(values);
DefaultTableModel model = new DefaultTableModel(new Object[]{"Fruit"}, 5);
JTable table = new JTable(model);
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 ComboBoxTableCellEditor extends AbstractCellEditor implements TableCellEditor {
private JComboBox editor;
private List<String> masterValues;
public ComboBoxTableCellEditor(List<String> masterValues) {
this.editor = new JComboBox();
this.masterValues = masterValues;
}
@Override
public Object getCellEditorValue() {
return editor.getSelectedItem();
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
DefaultComboBoxModel model = new DefaultComboBoxModel(masterValues.toArray(new String[masterValues.size()]));
for (int index = 0; index < table.getRowCount(); index++) {
if (index != row) {
String cellValue = (String) table.getValueAt(index, 0);
model.removeElement(cellValue);
}
}
editor.setModel(model);
editor.setSelectedItem(value);
return editor;
}
}
}
我更愿意有两个值池,一个是主列表,一个是选定值,每次调用编辑器时准备编辑器会更容易和更快,但这是基本思想...
关于java - 在 Swing 中更改 JTable 列中的下拉内容,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27009657/