Question

java中如何改变jcombobox选项的背景色？

我把jlabel设置为combobox的选择项，我让鼠标停留在某个选项上时，改变该选项的背景色，如何实现？
下面是我写的一个渲染器，不管是扩展jlabel还是jpanel，没有改变背景色

class StateLabelRenderer extends JPanel implements ListCellRenderer
{
private JLabel iconlabel ;
private JTextField jTextField ;
private Border selectedBorder = BorderFactory.createLineBorder(Color.green,1);
private Border emptyBorder = BorderFactory.createEmptyBorder();
private Color defaultBkgColor = new Color(200,200,169);;
private Color selectedColor = new Color(248,147,29);;

public StateLabelRenderer()
{
iconlabel = new JLabel() ;
jTextField = new JTextField() ;

this.setLayout(new FlowLayout());
this.add(iconlabel);
this.add(jTextField);
}

@Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
// TODO Auto-generated method stub

this.iconlabel.setIcon(((IconItem)(value)).getIcon());
this.jTextField.setText(((IconItem)(value)).getText());
this.setOpaque(false);

if (isSelected == true)
{
this.setBackground(selectedColor);
this.setBorder(selectedBorder);
}
else
{
this.setBackground(defaultBkgColor);
this.setBorder(emptyBorder);
}

return this;
}

public void setText(String string){
this.jTextField.setText(string);
}
public void setIcon(Icon icon){
this.iconlabel.setIcon(icon);
}

}

Answer 1

JPanel或JLabel 覆盖 paint(Graphics) 就可以了

追问

失效了。上面代码就是这个意思