[英]JComboBox as a Custom TableCellEditor
我有一張桌子。 對該表更新數據庫的更改。 一列由該表中的JComboBox編輯。 單擊該列中的任何單元格將觸發tableChanged事件。 但是,在選擇JComboBox的項目后需要觸發它。 如何在選擇后使tableChanged出現?
public class JIDCellEditor extends AbstractCellEditor implements TableCellEditor {
JComboBox jComboBox;
@Override
public Object getCellEditorValue() {
return jComboBox.getSelectedItem();
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
Vector vector = new Vector();
vector.add(0);
for (int i = 0; i < table.getRowCount(); i++) {
if (!vector.contains(table.getValueAt(i, 0)) && table.getValueAt(i, 3).toString().equals("Female")) {
vector.add(table.getValueAt(i, 0));
}
}
vector.remove(table.getValueAt(row, 0));
jComboBox = new JComboBox(vector);
jComboBox.setSelectedItem(value);
return jComboBox;
}
}
我強烈建議使用具有ComboBoxCellEditor組件的SwingX 。 它本質上是Sun的Swing組件應具備的功能的孵化器。 我不知道該項目是否仍在積極開發,但它已經成熟,我已經在很多項目中使用過它。
如果由於某種原因,您不能或不想使用外部庫,這里是他們的代碼(修改了部分以刪除自定義SwingX功能),注釋完好無損:
注意:該庫是GPL代碼。
/*
* $Id: ComboBoxCellEditor.java 3738 2010-07-27 13:56:28Z bierhance $
*
* Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;
import java.util.EventObject;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
/**
* <p>
* This is a cell editor that can be used when a combo box (that has been set up for automatic completion) is to be used in a JTable. The
* {@link javax.swing.DefaultCellEditor DefaultCellEditor} won't work in this case, because each time an item gets selected it stops cell
* editing and hides the combo box.
* </p>
* <p>
* Usage example:
* </p>
* <p>
*
* <pre>
* <code>
* JTable table = ...;
* JComboBox comboBox = ...;
* ...
* TableColumn column = table.getColumnModel().getColumn(0);
* column.setCellEditor(new ComboBoxCellEditor(comboBox));
* </code>
* </pre>
*
* </p>
*/
public class ComboBoxCellEditor extends DefaultCellEditor {
/**
* Creates a new ComboBoxCellEditor.
*
* @param comboBox the comboBox that should be used as the cell editor.
*/
public ComboBoxCellEditor(final JComboBox comboBox) {
super(comboBox);
comboBox.removeActionListener(this.delegate);
this.delegate = new EditorDelegate() {
@Override
public void setValue(final Object value) {
comboBox.setSelectedItem(value);
}
@Override
public Object getCellEditorValue() {
return comboBox.getSelectedItem();
}
@Override
public boolean shouldSelectCell(final EventObject anEvent) {
if (anEvent instanceof MouseEvent) {
final MouseEvent e = (MouseEvent) anEvent;
return e.getID() != MouseEvent.MOUSE_DRAGGED;
}
return true;
}
@Override
public boolean stopCellEditing() {
if (comboBox.isEditable()) {
// Commit edited value.
comboBox.actionPerformed(new ActionEvent(ComboBoxCellEditor.this, 0, ""));
}
return super.stopCellEditing();
}
@Override
public void actionPerformed(final ActionEvent e) {
ComboBoxCellEditor.this.stopCellEditing();
}
};
comboBox.addActionListener(this.delegate);
}
}
現在它有效。 每次調用getTableCellEditorComponent方法時,都需要重新初始化JComboBox。 並且在此JComboBox的itemstatechange中,stopCellEditing()方法必須通知偵聽器在選擇項目時完成編輯。 這使得TableModelListener成為fireTableChanged事件。 (已修復)但是,在單擊另一個JComboBox而未進行選擇后單擊JComboBox時,它也會觸發該事件。 (/固定)
編輯:以下代碼是最后一個版本。 通過此TableModelListener僅在選擇項目時通知。 上面提到的問題是固定的。 這是因為默認的stopCellEditing()方法總是返回true。 這會導致單元格編輯以意外方式停止。 必須根據需要覆蓋它並使用fireEditingStopped(); 必須用於通知TableModelListener
public class JIDCellEditor extends AbstractCellEditor implements TableCellEditor {
private JComboBox jComboBox = new JComboBox();
boolean cellEditingStopped = false;
@Override
public Object getCellEditorValue() {
return jComboBox.getSelectedItem();
}
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
Vector vector = new Vector();
ArrayList<Integer> arrayList = new ArrayList<Integer>();
arrayList.add(Integer.parseInt(value.toString()));
vector.add(0);
for (int i = 0; i < table.getRowCount(); i++) {
if (!vector.contains(table.getValueAt(i, 0)) && table.getValueAt(i, 3).toString().equals("Sheep")) {
vector.add(table.getValueAt(i, 0));
}
}
vector.remove(table.getValueAt(row, 0));
for (int i = 0; i < vector.size(); i++) {
}
jComboBox = new JComboBox(vector);
jComboBox.setSelectedItem(value);
jComboBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
fireEditingStopped();
}
}
});
jComboBox.addPopupMenuListener(new PopupMenuListener() {
@Override
public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
cellEditingStopped = false;
}
@Override
public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
cellEditingStopped = true;
fireEditingCanceled();
}
@Override
public void popupMenuCanceled(PopupMenuEvent e) {
}
});
return jComboBox;
}
@Override
public boolean stopCellEditing() {
return cellEditingStopped;
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.