JTable单元格中的JComboBox [英] JComboBox in a JTable cell
问题描述
我有一个使用模型创建的JTable,它基于一个对象矩阵。
对于每一行,我想使用JComboBox在特定列(第5行)中放入一些信息。
我尝试过以下方法:
I have a JTable created using a model, which is based on a matrix of objects. For each row, I want to put in a specific column (the 5th) some information using a JComboBox. I have tried the following:
for(int i=0; i < n ; i++) {
.....
data[i][5] = new JComboBox(aux); // aux is a Vector of elements I wanna insert
}
table.setModel(new MyTableModel()); // MyTableModel() already takes into consideration the data[][] object
问题在于数据[i] [5] =新的JComboBox(aux);不会在JTable的特定单元格中创建JComboBox对象,而是将代码粘贴到该行中。
我该怎么做才能解决这个问题?
The problem is that data[i][5] = new JComboBox(aux); does not create a JComboBox object in that specific cell of the JTable, but pastes a code into the row. What can I do to solve this problem?
谢谢。
推荐答案
一种方法是覆盖getCellEditor()方法以返回适当的编辑器。这是一个让你入门的例子:
One way is to override the getCellEditor() method to return an appropriate editor. Here is an example to get you started:
import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.table.*;
public class TableComboBoxByRow extends JFrame
{
List<TableCellEditor> editors = new ArrayList<TableCellEditor>(3);
public TableComboBoxByRow()
{
// Create the editors to be used for each row
String[] items1 = { "Red", "Blue", "Green" };
JComboBox comboBox1 = new JComboBox( items1 );
DefaultCellEditor dce1 = new DefaultCellEditor( comboBox1 );
editors.add( dce1 );
String[] items2 = { "Circle", "Square", "Triangle" };
JComboBox comboBox2 = new JComboBox( items2 );
DefaultCellEditor dce2 = new DefaultCellEditor( comboBox2 );
editors.add( dce2 );
String[] items3 = { "Apple", "Orange", "Banana" };
JComboBox comboBox3 = new JComboBox( 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);
}
};
System.out.println(table.getCellEditor());
JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
}
public static void main(String[] args)
{
TableComboBoxByRow frame = new TableComboBoxByRow();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible(true);
}
}
编辑:更新代码以使用trashgod的建议。
code updated to use trashgod's suggestion.
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