两个组合框使用相同的代码,唯一的异常(exception)是“组合 1”设置为可编辑,而“组合 2”则不可编辑。两者都选择了“项目 1”。如您所见,“Combo 1”在组合文本字段中打印“[Ljava.lang.Object;@77905258”,“Combo 2”打印所选名称。
“Combo 1”如何在组合框文本字段中打印与“Combo 2”相同的文本?
符合E:(参见附图) 如果您单击“Combo 1”,您将看到项目 1、项目 2 的列表...但是当选择项目时,文本字段将显示“[Ljava.lang.Object;@77905258”(这里是项目 1)被选中)。
如果您点击“Combo 2”,您将看到项目 1、项目 2 的列表...并且当选择“项目 1”时,不可编辑的文本字段将显示“项目 1”。
这是代码:
我正在使用自定义渲染器:
public class MyListRenderer extends JLabel
implements ListCellRenderer{
@Override
public Component getListCellRendererComponent(
JList list, Object value,
int index, boolean isSelected,
boolean cellHasFocus) {
Object[] itemData =(Object[])value;
setText((String)itemData[1]);
return this;
}
}
以下是设置 2 个组合框列表的代码:
private void iniCombobox() {
cmbMyCombo.addItem(new Object[] {"1", "Item 1"});
cmbMyCombo.addItem(new Object[] {"2", "Item 2"});
cmbMyCombo.addItem(new Object[] {"3", "Item 3"});
cmbMyCombo2.addItem(new Object[] {"1", "Item 1"});
cmbMyCombo2.addItem(new Object[] {"2", "Item 2"});
cmbMyCombo2.addItem(new Object[] {"3", "Item 3"});
cmbMyCombo.setRenderer(new MyListRenderer());
cmbMyCombo2.setRenderer(new MyListRenderer());
}
这是事件的代码。这设置了每个选定项目的文本字段:
private void cmbMyComboActionPerformed(
java.awt.event.ActionEvent evt) {
Object mySelectedItem = cmbMyCombo.getSelectedItem();
Object myObject[] = (Object[])mySelectedItem;
txtID.setText(myObject[0].toString());
txtName.setText(myObject[1].toString());
}
private void cmbMyCombo2ActionPerformed(
java.awt.event.ActionEvent evt) {
Object mySelectedItem = cmbMyCombo.getSelectedItem();
Object myObject[] = (Object[])mySelectedItem;
txtID1.setText(myObject[0].toString());
txtName1.setText(myObject[1].toString());
}
这里是完整的代码,可以剪切并粘贴以遵守 SC 和 C。不要忘记添加自定义渲染器“MyListRenderer”类。 (使用 NetBean 7.1 编译):
package combobox;
public class MyComboBox extends javax.swing.JFrame {
public MyComboBox() {
initComponents();
iniCombobox();
}
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
cmbMyCombo = new javax.swing.JComboBox();
lblId = new javax.swing.JLabel();
txtID = new javax.swing.JTextField();
lblName = new javax.swing.JLabel();
txtName = new javax.swing.JTextField();
jPanel2 = new javax.swing.JPanel();
cmbMyCombo2 = new javax.swing.JComboBox();
txtID1 = new javax.swing.JTextField();
lblId1 = new javax.swing.JLabel();
txtName1 = new javax.swing.JTextField();
lblName1 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants
.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory
.createTitledBorder("Combo 1"));
cmbMyCombo.setEditable(true);
cmbMyCombo.addActionListener(new java.awt.event
.ActionListener() {
public void actionPerformed(java.awt.event
.ActionEvent evt) {
cmbMyComboActionPerformed(evt);
}
});
lblId.setText("ID:");
lblName.setText("Name:");
javax.swing.GroupLayout jPanel1Layout = new javax
.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax
.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout
.Alignment.TRAILING,
jPanel1Layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(cmbMyCombo, javax
.swing.GroupLayout.PREFERRED_SIZE,
141,
javax.swing.GroupLayout
.PREFERRED_SIZE)
.addGap(40, 40, 40))
.addGroup(jPanel1Layout
.createSequentialGroup()
.addGroup(jPanel1Layout
.createParallelGroup(
javax.swing.GroupLayout
.Alignment.LEADING)
.addGroup(jPanel1Layout
.createSequentialGroup()
.addComponent(lblId)
.addGap(28, 28, 28)
.addComponent(txtID, javax
.swing.GroupLayout
.PREFERRED_SIZE, 66,
javax.swing.GroupLayout
.PREFERRED_SIZE)
.addPreferredGap(javax
.swing.LayoutStyle
.ComponentPlacement.RELATED,
81,
javax.swing.GroupLayout
.PREFERRED_SIZE))
.addGroup(jPanel1Layout
.createSequentialGroup()
.addComponent(lblName)
.addPreferredGap(javax
.swing.LayoutStyle
.ComponentPlacement.RELATED)
.addComponent(txtName,
javax.swing.GroupLayout
.PREFERRED_SIZE,
147, javax.swing
.GroupLayout
.PREFERRED_SIZE)))
.addContainerGap(
35, Short.MAX_VALUE))))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax
.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(cmbMyCombo, javax.swing
.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle
.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(txtID,
javax.swing.GroupLayout
.PREFERRED_SIZE, javax.swing
.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(lblId))
.addPreferredGap(javax.swing.LayoutStyle
.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lblName)
.addComponent(txtName,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(javax.swing.GroupLayout
.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel2.setBorder(javax.swing.BorderFactory
.createTitledBorder("Combo 2"));
cmbMyCombo2.setToolTipText("");
cmbMyCombo2.addActionListener(
new java.awt.event.ActionListener() {
public void actionPerformed(
java.awt.event.ActionEvent evt) {
cmbMyCombo2ActionPerformed(evt);
}
});
lblId1.setText("ID:");
lblName1.setText("Name:");
javax.swing.GroupLayout jPanel2Layout =
new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGroup(jPanel2Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
jPanel2Layout.createSequentialGroup()
.addGap(41, 41, 41)
.addComponent(
cmbMyCombo2,
javax.swing.GroupLayout
.PREFERRED_SIZE, 135,
javax.swing.GroupLayout
.PREFERRED_SIZE))
.addGroup(
jPanel2Layout.createSequentialGroup()
.addGap(18, 18, 18)
.addGroup(jPanel2Layout
.createParallelGroup(
javax.swing.GroupLayout
.Alignment.LEADING)
.addGroup(
jPanel2Layout
.createSequentialGroup()
.addComponent(lblId1)
.addGap(28, 28, 28)
.addComponent(txtID1,
javax.swing.GroupLayout
.PREFERRED_SIZE,
66,
javax.swing.GroupLayout
.PREFERRED_SIZE)
.addPreferredGap(
javax.swing.LayoutStyle
.ComponentPlacement.RELATED,
81, javax.swing.GroupLayout
.PREFERRED_SIZE))
.addGroup(jPanel2Layout
.createSequentialGroup()
.addComponent(lblName1)
.addPreferredGap(
javax.swing.LayoutStyle
.ComponentPlacement.RELATED)
.addComponent(txtName1,
javax.swing.GroupLayout
.PREFERRED_SIZE,
147,
javax.swing.GroupLayout
.PREFERRED_SIZE)))))
.addContainerGap(25, Short.MAX_VALUE))
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addComponent(
cmbMyCombo2,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle
.ComponentPlacement.RELATED)
.addGroup(jPanel2Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(
txtID1,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(lblId1))
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement
.RELATED)
.addGroup(
jPanel2Layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lblName1)
.addComponent(txtName1,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE))
);
javax.swing.GroupLayout layout =
new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(
jPanel1,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(
jPanel2,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING,
false)
.addComponent(
jPanel1,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE)
.addComponent(
jPanel2,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE))
.addContainerGap(
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE))
);
pack();
}
private void cmbMyComboActionPerformed(
java.awt.event.ActionEvent evt) {
Object mySelectedItem = cmbMyCombo.getSelectedItem();
Object myObject[] = (Object[])mySelectedItem;
txtID.setText(myObject[0].toString());
txtName.setText(myObject[1].toString());
}
private void cmbMyCombo2ActionPerformed(
java.awt.event.ActionEvent evt) {
Object mySelectedItem = cmbMyCombo2.getSelectedItem();
Object myObject[] = (Object[])mySelectedItem;
txtID1.setText(myObject[0].toString());
txtName1.setText(myObject[1].toString());
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MyComboBox().setVisible(true);
}
});
}
private javax.swing.JComboBox cmbMyCombo;
private javax.swing.JComboBox cmbMyCombo2;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JLabel lblId;
private javax.swing.JLabel lblId1;
private javax.swing.JLabel lblName;
private javax.swing.JLabel lblName1;
private javax.swing.JTextField txtID;
private javax.swing.JTextField txtID1;
private javax.swing.JTextField txtName;
private javax.swing.JTextField txtName1;
// End of variables declaration
private void iniCombobox() {
cmbMyCombo.addItem(new Object[] {"1", "Item 1"});
cmbMyCombo.addItem(new Object[] {"2", "Item 2"});
cmbMyCombo.addItem(new Object[] {"3", "Item 3"});
cmbMyCombo2.addItem(new Object[] {"1", "Item 1"});
cmbMyCombo2.addItem(new Object[] {"2", "Item 2"});
cmbMyCombo2.addItem(new Object[] {"3", "Item 3"});
cmbMyCombo.setRenderer(new MyListRenderer());
cmbMyCombo2.setRenderer(new MyListRenderer());
}
}
最佳答案
最后......为了实现这一点,我必须添加一个基本的自定义组合框编辑器,并将自定义编辑器设置为我的原始代码中的组合框(包含在我的问题中):
cmbMyCombo.setEditor(new MyComboEditor());
自定义组合框编辑器类需要实现ComboBoxEditor。我有 6 种方法可以重写。但这里有 3 个主要的。在 getEditorComponent 中,我返回一个文本字段,但我可以返回任何类型的组件。
@Override
public Component getEditorComponent() {
return textFeild;
}
然后,我根据 setItem() 中选定的对象数据 [1] 设置 textField 中的文本(请注意,我保留原始对象以便稍后返回“myReturnObject”):
@Override
public void setItem(Object anObject) {
if(anObject != null){
myObject = (Object[])anObject;
myReturnObject = anObject;
//I can now set whatever i want in the text feild
textFeild.setText(myObject[1].toString());//<--
}
else{
myReturnObject = anObject;
}
}
然后,如果从列表中选择原始对象,则返回原始对象;如果文本字段已被编辑,则返回自定义对象。
@Override
public Object getItem() {
String objectTxt = myObject[1].toString();
String feildTxt = textFeild.getText();
if(objectTxt.equals(feildTxt)){
return myReturnObject;
}
else{
//Creating and returning custom object with the Feild text
//and setting the contnent of the text feild in the object
return new Object[]{"0",textFeild.getText()};
}
}
对于组合框来说,这需要做很多工作,但对我来说这是值得的。希望这可以帮助其他人。
以下是这项工作的引用资料: http://www.java2s.com/Code/Java/Swing-JFC/AfancyexampleofJComboBoxwithacustomrendererandeditor.htm http://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html 以下是自定义组合编辑器“MyComboEditor()”的完整代码:
package combobox;
import java.awt.Component;
import java.awt.event.ActionListener;
import javax.swing.ComboBoxEditor;
import javax.swing.JTextField;
public class MyComboEditor implements ComboBoxEditor {
JTextField textFeild;
Object myObject[];
Object myReturnObject;
public MyComboEditor(){
textFeild = new JTextField();
}
@Override
public Component getEditorComponent() {
return textFeild;
}
@Override
public void setItem(Object anObject) {
if(anObject != null){
myObject = (Object[])anObject;
myReturnObject = anObject;
textFeild.setText(myObject[1].toString());
}
else{
myReturnObject = anObject;
}
}
@Override
public Object getItem() {
String objectTxt = myObject[1].toString();
String feildTxt = textFeild.getText();
if(objectTxt.equals(feildTxt)){
return myReturnObject;
}
else{
return new Object[]{"0",textFeild.getText()};
}
}
@Override
public void selectAll() {
throw new UnsupportedOperationException(
"Not supported yet. in select All");
}
@Override
public void addActionListener(ActionListener l) {
textFeild.addActionListener(l);
}
@Override
public void removeActionListener(ActionListener l) {
textFeild.removeActionListener(l);
}
}
关于java - 从自定义渲染设置可编辑 JComboBox 中的文本字段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10776416/