[英]JComboBox in a JTable cell
我有一個使用模型創建的 JTable,該模型基於對象矩陣。 對於每一行,我想使用 JComboBox 在特定列(第 5 列)中放入一些信息。 我嘗試了以下方法:
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
問題是data[i][5] = new JComboBox(aux);
不會在 JTable 的特定單元格中創建 JComboBox 對象,而是將代碼粘貼到行中。 我能做些什么來解決這個問題?
一種方法是覆蓋 getCellEditor() 方法以返回適當的編輯器。 這是一個讓您入門的示例:
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);
}
}
編輯:代碼更新為使用垃圾神的建議。
嘗試這樣的事情:
public void example(){
TableColumn tmpColum =table.getColumnModel().getColumn(1);
String[] DATA = { "Data 1", "Data 2", "Data 3", "Data 4" };
JComboBox comboBox = new JComboBox(DATA);
DefaultCellEditor defaultCellEditor=new DefaultCellEditor(comboBox);
tmpColum.setCellEditor(defaultCellEditor);
tmpColum.setCellRenderer(new CheckBoxCellRenderer(comboBox));
table.repaint();
}
/**
Custom class for adding elements in the JComboBox.
*/
class CheckBoxCellRenderer implements TableCellRenderer {
JComboBox combo;
public CheckBoxCellRenderer(JComboBox comboBox) {
this.combo = new JComboBox();
for (int i=0; i<comboBox.getItemCount(); i++){
combo.addItem(comboBox.getItemAt(i));
}
}
public Component getTableCellRendererComponent(JTable jtable, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
combo.setSelectedItem(value);
return combo;
}
}
對於要禁用的JComboBox
,您必須使用TableCellRenderer
。 看看使用組合框作為編輯器。
呵呵,不能像你說的那樣用。
您必須創建自定義 TableCellRenderer 或 TableCellEditor。 然后您可以指定它將用於哪個類:
JTable.setDefaultRenderer(Class<?> columnClass, TableCellRenderer renderer)
JTable.setDefaultEditor(Class<?> columnClass, TableCellEditor editor)
可以在此處找到詳細說明: http : //download.oracle.com/docs/cd/E17409_01/javase/tutorial/uiswing/components/table.html#combobox
對於特定行和列中的自定義渲染器,您可以簡單地使用:
final int specialRow = 1;
final int specialColumn = 5;
JTable table = new JTable(myModel) {
private TableCellEditor mySpecialCellEditor = new SpecialCellEditor( ... );
public TableCellEditor getCellEditor(int row, int column) {
int modelColumn = convertColumnIndexToModel(column);
int modelRow = convertRowIndexToModel(row);
if (modelColumn == specialColumn && row == specialRow ) {
return mySpecialCellEditor;
} else {
return super.getCellEditor(row, column);
}
}
};
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