Swing JList渲染器--DefaultListCellRenderer的使用

来源：互联网发布：js提交复杂表单编辑：程序博客网时间：2024/05/21 13:22

效果如图：

package test;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.DefaultListCellRenderer;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;

@SuppressWarnings("serial")
public class CellRenderer extends DefaultListCellRenderer{
   JPanel newPanel = new JPanel();
   String[] s = {"美国","日本","大陆","英国","法国","意大利","澳洲","韩国"};
   String valueIndex="1,3,5";
   public Component createComponent() {
       JList list = new JList(s);
       JScrollPane jScrollPane = new JScrollPane(list);
       jScrollPane.setPreferredSize(new Dimension(150, 230));    //设置滚动list的宽度以及高度（宽150，高230）

       //加载样式
       list.setCellRenderer((ListCellRenderer) getListCellRendererComponent(list, "", 0, true, true));

       //加载选择文件框
       newPanel.add(jScrollPane);

       return newPanel;
   }

            //JLst渲染器
           //list - 正在绘制的 JList,value - 由 list.getModel().getElementAt(index) 返回的值,index - 单元格索引。isSelected - 如果选择了指定的单元格，则为 true。cellHasFocus - 如果指定的单元格拥有焦点，则为 true。
           public Component getListCellRendererComponent(javax.swing.JList list,
                       Object value, int index, boolean isSelected, boolean cellHasFocus) {
           setText(value.toString());
           Color background = null;
           Color foreground = null;
           if(valueIndex!=null){
               String[] _valueIndex = valueIndex.split(",");
                   for(int i=0;i<_valueIndex.length;i++){
                       if((index+"").equals(_valueIndex[i])){
                           background = Color.RED;
                           foreground = Color.WHITE;
                       }
                   }
           }

           if(isSelected){
               background = Color.BLUE;
               foreground = new Color(0, 255, 0);
           }
           setBackground(background);
           setForeground(foreground);

           return this;
               }

           public static void main(String[] args) {
               CellRenderer test = new CellRenderer();
               Component contents = test.createComponent();

               JFrame frame = new JFrame("CellRenderer");
               frame.setCursor(new Cursor(12));
               frame.setBounds(0, 0,300, 300);
               frame.setResizable(false); // 禁止最大化,禁止拖拉窗口大小
               // frame.pack();
               // 设置窗体启动位置
               frame.setLocationRelativeTo(null);
               frame.setVisible(true);
               frame.getContentPane().add(contents, BorderLayout.CENTER);

               frame.addWindowListener(new WindowAdapter() {
                   public void windowClosing(WindowEvent e) {
                       System.exit(0);
                   }
               });
           }
}

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