mytreecellrender.java

java绘图 java awt 经典绘图的例子,对于初学awt模块的人非常有帮助.

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package swing;

import java.awt.Color;
import java.awt.Component;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JTree;
import javax.swing.tree.TreeCellRenderer;

/**
 * 
 * @author zhaolin
 */
public class MyTreeCellRender extends JLabel implements TreeCellRenderer {

    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        if(leaf){
            this.setIcon(new ImageIcon("MIDDLE.GIF"));
        }else{
            if(expanded)
                this.setIcon(new ImageIcon("open.png"));
            else
                this.setIcon(new ImageIcon("close.png"));
        }
        
        if(selected){
            this.setBorder(BorderFactory.createLineBorder(Color.RED));
        }else{
            this.setBorder(null);
        }
        this.setText(value.toString());
        return this;
    }

}