首页 > java > jlist > Java Swing - 如何将JTextArea安装为JList渲染器

Java Swing - 如何将JTextArea安装为JList渲染器

jlist 【jlist】
我们想知道如何将JTextArea安装为JList渲染器。
代码展示 运行结果 
import java.awt.Color;
import java.awt.Component;

import javax.swing.BorderFactory;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ListCellRenderer;

public class Main extends JPanel {
  final String[] DATA = { "One\n1", "Two\n2", "Three\n3" };
  DefaultListModel<String> listModel = new DefaultListModel<>();
  JList<String> list = new JList<>(listModel);

  public Main() {
    list.setCellRenderer(new Listm(3, 30));
    add(new JScrollPane(list));
    for (String datum : DATA) {
      listModel.addElement(datum);
    }
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new Main());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}
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(Color.RED);
    } else if (isSelected) {
      setBackground(Color.BLUE);
    } else {
      setBackground(null);
    }
    return this;
  }
}