我正在使用JList,并且尝试使用JTextAreas(实现ListCellRenderer)作为单元格。它不起作用。单元格仅显示ListCellRenderer.toString()而不是实际的JTextArea。有人可以帮忙吗?谢谢。
DefaultListModel listModel = new DefaultListModel();
JList list = new JList(listModel);
add(list);
class ButtonListener implements ActionListener() {
public void actionPerformed(ActionEvent e){
listModel.clear();
for (String s : stringArray) {
listModel.addElement(new Listm(s));
}
}
}
class Listm extends JTextArea implements ListCellRenderer {
protected Listm(String text) {
setText(text); //Outputting the text element displays the desired String
}
public Component getListCellRendererComponent(JList list, Object object, int number, boolean bool, boolean bool2) {
setPreferredSize(new Dimension(x, y));
return this;
}
}
}
最佳答案
您应该只发布可编译的代码,并且您的代码有些混乱。您不应该将文本传递到渲染器的构造函数中,因为该构造函数将用于渲染列表中所有项目的单个渲染器(除非您希望所有人都使用相同的代码)。您不应忽略传递到getListCellRendererComponent方法中的Object参数,因为这是渲染器项目显示的数据。例如:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MyGui extends JPanel {
public static final String[] DATA = {"One\n1", "Two\n2", "Three\n3"};
private DefaultListModel listModel = new DefaultListModel();
private JList list = new JList(listModel);
public MyGui() {
list.setCellRenderer(new Listm(3, 30));
add(new JScrollPane(list));
for (String datum : DATA) {
listModel.addElement(datum);
}
}
private class Listm extends JTextArea implements ListCellRenderer {
protected Listm(int rows, int cols) {
super(rows, cols);
setBorder(BorderFactory.createLineBorder(Color.blue));
}
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
setText(value.toString());
if (cellHasFocus) {
setBackground(FOCUSED_COLOR);
} else if (isSelected) {
setBackground(SELECTED_COLOR);
} else {
setBackground(null);
}
return this;
}
}
private static void createAndShowUI() {
JFrame frame = new JFrame("MyGui");
frame.getContentPane().add(new MyGui());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}