[code="java"]public class mousergister extends JPanel {
JPanel jp;
JComboBox setImg;
ComboBoxRenderer renderer;
public static void main(String[] args) {
new mousergister();
}
public mousergister() {
BaseFrame bf=new BaseFrame("用户注册");
bf.add(this);
this.setLayout(null);
renderer = new ComboBoxRenderer();
renderer.setPreferredSize(new Dimension(100, 50));
Object elements[][] = {
{ new MyIcon("images/1.jpg",this)},
{ new MyIcon("images/2.gif",this) },
{ new MyIcon("images/3.jpg",this)},
};
setImg = new JComboBox(elements);
setImg.setRenderer(renderer);
setImg.setBounds(120, 25, 75, 60);
add(setImg);
bf.setLocation(500, 100);// 设置窗口在屏幕的位置
bf.setSize(320, 420);
bf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
bf.setResizable(false);// 设置游戏窗口大小不可改变
bf.setVisible(true);
}
private class ComboBoxRenderer extends JLabel implements ListCellRenderer {
// 这样要是实现接口的方法：
/*
*
* This method finds the image and text corresponding to the selected
*
* value and returns the label, set up to display the text and image.
*/
@Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
ImageIcon image=null;
if (value instanceof Object[]) {
Object[] values = (Object[]) value;
image = (ImageIcon)values[0];
}
if (image != null) {
this.setIcon(image);
}
return this;
}
}
private class MyIcon extends ImageIcon{
private Image m;
private String str;
private mousergister jp;
public MyIcon(String str,mousergister jp) {
Toolkit tool;
tool = jp.renderer.getToolkit();
m = tool.getImage(str);
}
public void paintIcon(Component lab, Graphics g){
lab=jp.renderer;
g.drawImage(m, 20, 20, lab);
}
}
}[/code]
图片不会显示。。。怎么改？
[quote]
Object elements[][] = {
{ new MyIcon("images/1.jpg",this)},
{ new MyIcon("images/2.gif",this) },
{ new MyIcon("images/3.jpg",this)},
};
[/quote]
这段直接用ImageIcon
[code="java"]
Object elements[][] = {
{ new ImageIcon(this.getClass().getResource("images/1.jpg"))},
{ new ImageIcon(this.getClass().getResource("images/2.gif")) },
{ new ImageIcon(this.getClass().getResource("images/3.jpg"))},
};
[/code]
请google，这种类似于自定义显示的，一搜一大把！
getListCellRendererComponent()方法是需要修改的。
参数value是Object类型，if的判断条件value instanceof Object[]不会成立，if代码块是不会执行的。
[code="java"]if (value instanceof Object[]) {
Object[] values = (Object[]) value;
image = (ImageIcon)values[0];
}
if (image != null) {
this.setIcon(image);
}
return this;
} [/code]
改成下面的试试。
[code="java"]public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
if (value != null) {
setIcon(new ImageIcon("images/1.jpg"));
}
if (isSelected) {
setBackground(list.getSelectionBackground());
setForeground(list.getSelectionForeground());
} else {
setBackground(list.getBackground());
setForeground(list.getForeground());
}
return this;
}[/code]