在一个类中可以有多个ListCellRenderer的实现吗?
实际上,我的应用程序中有多个JList,而我每个人都需要不同的ListCellRenderer。
我可以为实现ListCellRenderer的Component方法使用不同的类名吗?
例如:如果我有一个名称为“ MultiColumnCellRenderer2”的类,它具有Component方法的某些实现,而另一个类的名称是“ MultiColumnCellRenderer2”,则具有其他方法的某些实现?
public class MultiColumnCellRenderer extends JPanel implements
ListCellRenderer {
public MultiColumnCellRenderer() {
}
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
// Some implementation of Component Method
super.setEnabled(list.isEnabled());
super.setFont(list.getFont());
return this;
}
}
public class MultiColumnCellRenderer2 extends JPanel implements
ListCellRenderer {
public MultiColumnCellRenderer2() {
}
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
// Some implementation of Component Method
super.setEnabled(list.isEnabled());
super.setFont(list.getFont());
return this;
}
}`
如果我做类似的事情:
list1.setCellRenderer(new MultiColumnCellRenderer());
list2.setCellRenderer(new MultiColumnCellRenderer2());
它不起作用...。
我正在为list1和list2寻找不同的渲染。
我该如何实现
最佳答案
在一个类中可以有多个ListCellRenderer的实现吗?
如果“拥有”是指“使用”,而“类别”是指“ GUI”,则为是。
这是一个例子:
资源
import java.awt.*;
import javax.swing.*;
class MultiColumnCellRendererTest {
public static void main(String[] args) {
final String[] fruits = {
"Apple",
"Pear",
"Banana",
"Grapefruit"
};
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JList fruitList1 = new JList(fruits);
fruitList1.setCellRenderer(new MultiColumnCellRenderer());
JList fruitList2 = new JList(fruits);
fruitList2.setCellRenderer(new MultiColumnCellRenderer2());
JPanel gui = new JPanel(new GridLayout(1,0,2,2));
gui.add(fruitList1);
gui.add(fruitList2);
JOptionPane.showMessageDialog(null, gui);
}
});
}
}
class MultiColumnCellRenderer extends JPanel implements
ListCellRenderer {
JLabel label;
public MultiColumnCellRenderer() {
setBackground(Color.RED);
label = new JLabel();
add(label);
}
@Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
label.setText(value.toString());
super.setEnabled(list.isEnabled());
super.setFont(list.getFont());
return this;
}
}
class MultiColumnCellRenderer2 extends JPanel implements
ListCellRenderer {
JLabel label;
public MultiColumnCellRenderer2() {
setBackground(Color.GREEN);
label = new JLabel();
add(label);
}
@Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
label.setText(value.toString());
super.setEnabled(list.isEnabled());
super.setFont(list.getFont());
return this;
}
}