package jb2011.t;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.io.InputStream;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import com.android.ninepatch.NinePatch;
/**
* 本类用于测试从Android中引入的NinePatch（九格图）技术的可行性.
*
* @author jb2011@163.com
* @version 1.0
*/
class Test extends JPanel
{
//NinePatch作为全局对象，提高性能
private NinePatch mPatch;
public Test()
{
super (new BorderLayout());
//*** 关键代码：读取9格图 START
try{
InputStream stream = this .getClass().getResourceAsStream(
//                    "content_bg2.9.png"
"content_bg3.9.png"
);
mPatch = NinePatch.load(stream, true /* is9Patch*/, false /* convert */);
}
catch (Exception e){
e.printStackTrace();
}
//*** 关键代码：读取9格图 END
//加入一个面板，用于演示
JPanel p = new JPanel();
p.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
//该面板设置成背景透明
p.setOpaque(false);
this.add(p);
//加入演示组件
p.add(new JButton("JButton 1"));
p.add(new JButton("JButton 2"));
p.add(new JButton("JButton 3"));
p.add(new JButton("JButton 4"));
}
/**
* 重写父类方法，以便实现自定义背景的绘制.
*/
@Override protected void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
Rectangle clip = g2.getClipBounds(); // 有点小问题，要用(0, 0, getWidth(), getHeight())，否则每次绘制的clip都不一样而导致异常现象.
//*** 关键代码：使用9格图 START
//使用9格图绘制面板的背景
        mPatch.draw(g2, clip.x, clip.y, clip.width, clip.height);
//*** 关键代码：使用9格图 END
    }
public static void main(final String[] args)
{
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame();
frame.setContentPane(new JPanel(new BorderLayout()));
((JPanel)frame.getContentPane()).setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
frame.getContentPane().add(new Test(), BorderLayout.CENTER);
frame.setSize(300,250);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}