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("用戶注冊");
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);// 設(shè)置窗口在屏幕的位置
bf.setSize(320, 420);
bf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
bf.setResizable(false);// 設(shè)置游戲窗口大小不可改變
bf.setVisible(true);
}
private class ComboBoxRenderer extends JLabel implements ListCellRenderer {
// 這樣要是實現(xiàn)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;圖片不會顯示。。。怎么改？
2 回答
幕布斯1329279
TA貢獻8條經(jīng)驗 獲得超0個贊
getListCellRendererComponent()方法是需要修改的。
參數(shù)value是Object類型，if的判斷條件value instanceof Object[]不會成立，if代碼塊是不會執(zhí)行的。
if (value instanceof Object[]) {
Object[] values = (Object[]) value;
image = (ImageIcon)values[0];
}
if (image != null) {
??????????????this.setIcon(image);??? ????????????}??? ????????????return?this;??? ??????????}
改成下面的試試。
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;
????}
一只名叫tom的貓
TA貢獻1906條經(jīng)驗 獲得超3個贊
Object elements[][] = {
{ new MyIcon("images/1.jpg",this)},
{ new MyIcon("images/2.gif",this) },
{ new MyIcon("images/3.jpg",this)},
};這段直接用ImageIcon
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"))},
};添加回答
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