问题描述
我想创建类似于 Firefox 的 URL 文本框的 JComboBox
控件.有谁知道如何自定义 JComboBox
的文本字段.我想在 JComboBox
I would like to create JComboBox
control similar with the URL textbox of Firefox. Does anyone know how to customize the textfield of the JComboBox
. I want to add some icons on the ALIGN.HORIZONTAL_RIGHT
near the arrow button of the JComboBox
感谢您非常详细的解释.实际上我会结合 DefaultListCellRenderer
并将图标添加到组合框中,如下面的代码
Thanks for your very detail explanation. Actually I will combine DefaultListCellRenderer
and add the icon to the combo box like following code
import java.awt.Dimension;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class Main extends JFrame {
public Main() {
// Create icon "C"
JButton jb = new JButton("C");
jb.setMargin(new Insets(0, 0, 0, 0));
jb.setBounds(245, 2, 18, 18);
// Create combo box
String[] languages = new String[]{"Java", "C#", "PHP"};
JComboBox jc = new JComboBox(languages);
// jc.setEditable(true);
jc.add(jb);
getContentPane().add(jc);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(new Dimension(300, 58));
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
final Main main = new Main();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
main.setVisible(true);
}
});
}
}
但是当我把 jc.setEditable(true)
;组合编辑器隐藏了我的图标.我在想另一种方式来模拟火狐真棒吧.你对此有什么想法吗?
But when I put jc.setEditable(true)
; the combo editor hided my icon. I'm thinking another way to simulate Firefox awesome bar. Do you have any idea for this?
推荐答案
这是演示它的完整示例:
Here is completed example that demonstrate it:
package com.demo.combo.icon;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.HashMap;
import java.util.Map;
import javax.swing.DefaultListCellRenderer;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ShowConboWithIcons extends JFrame {
private static final long serialVersionUID = 1L;
private static final ImageIcon INFO_ICON = new ImageIcon("info.png");
private static final ImageIcon NONE_ICON = new ImageIcon("none.png");
public final String NONE_STR = "None";
private final String INFO_STR = "Info";
private JComboBox comboBox;
private JPanel topPanel;
private String[] str_arr = null;
public ShowConboWithIcons(String[] str_arr) {
this.str_arr = str_arr;
}
public void createGUI(){
setMinimumSize(new Dimension(100,100));
setTitle("Demo");
setLocation(200, 200);
topPanel = new JPanel();
getContentPane().add(topPanel, BorderLayout.CENTER);
Map<Object, Icon> icons = new HashMap<Object, Icon>();
icons.put(NONE_STR, NONE_ICON);
icons.put(INFO_STR, INFO_ICON);
comboBox = new JComboBox();
comboBox.setRenderer(new IconListRenderer(icons));
comboBox.addItem("None");
for(String val : str_arr){
comboBox.addItem(val);
}
topPanel.add(comboBox);
super.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
dispose();
}
});
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException {
UIManager.setLookAndFeel( "com.sun.java.swing.plaf.windows.WindowsLookAndFeel" );
String[] str_arr = {"A", "B", "C", "D", "E"};
ShowConboWithIcons T = new ShowConboWithIcons(str_arr);
T.createGUI();
T.setVisible(true);
}
class IconListRenderer extends DefaultListCellRenderer{
private static final long serialVersionUID = 1L;
private Map<Object, Icon> icons = null;
public IconListRenderer(Map<Object, Icon> icons){
this.icons = icons;
}
@Override
public Component getListCellRendererComponent(JList list, Object value, int index,boolean isSelected, boolean cellHasFocus)
{
JLabel label = (JLabel) super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
// Get icon to use for the list item value
Icon icon = icons.get(value);
if(!value.toString().equals(NONE_STR)){
icon = icons.get(INFO_STR);
}
// Set icon to display for value
label.setIcon(icon);
return label;
}
}
}
预览:
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