Java InternalFrame

package com.han;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.image.BufferedImage;
import java.beans.PropertyVetoException;
import java.io.IOException;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;


/**
 * 有几个技术改进：<p>
 * 1. 在desktopPane的背景图片上再加上button等组件<p>
 * 2. desktopPane的背景图片大小随着整个窗体的大小变化而变化，使图片始终能够铺满整个区域<p>
 * 3. 对于desktopPane上的所有组件不使用绝对布局而是在backLabel存在的情况下还使用布局管理器
 * @author HAN
 * 
 */
@SuppressWarnings("serial")
public class JInternalFrame_1 extends JFrame {
	JInternalFrame internalFramePersonel = null;
	JInternalFrame internalFrameCount = null;
	JInternalFrame internalFramePayment = null;
	JPanel panelInternal;
	static JDesktopPane desktopPane = null;
	static JPanel panel;
	static Container container;
	static Dimension dimensionCurrent;
	static Insets insets; // the frame border
	
	int desktopPaneWidth;
	int desktopPaneHeight;
	
	static JLabel backLabel;
	
	URL resource; // the backLabel image URL resource
	

	public JInternalFrame_1() {
		// TODO Auto-generated constructor stub
		panel = new JPanel(new FlowLayout(FlowLayout.LEFT));
		JButton buttonPersonel = new JButton("人事管理");
		JButton buttonCount = new JButton("帐套管理");
		JButton buttonPayment = new JButton("待遇管理");
		panel.add(buttonPersonel);
		panel.add(buttonCount);
		panel.add(buttonPayment);

		container = getContentPane();
		container.add(panel, BorderLayout.NORTH);
		desktopPane = new JDesktopPane();
		container.add(desktopPane, BorderLayout.CENTER);
		resource = this.getClass().getResource("/images/LightHouse.jpg");
		ImageIcon imageIcon = new ImageIcon(resource);
		backLabel = new JLabel(imageIcon);
		backLabel.setBounds(0, 0, imageIcon.getIconWidth(),
				imageIcon.getIconHeight());

		// "new Integer(Integer.MIN_VALUE)" ensures that its layer is always
		// under the others.
		desktopPane.add(backLabel, new Integer(Integer.MIN_VALUE));

		desktopPane.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
		
		panelInternal = new JPanel(); // Creates a new JPanel with a double buffer and a flow layout.
		panelInternal.setBounds(0, 0, 300, 300);
		System.out.println(panelInternal.isOpaque());
		panelInternal.setOpaque(false);
		System.out.println(desktopPane.getWidth() + "\t" + desktopPane.getHeight());
		JButton buttonInternal = new JButton("buttonInternal");
		JButton testButton = new JButton("testButton");
		
		testButton.setBounds(200, 0, 100, 40); 
		buttonInternal.setBounds(0, 0, 100, 40); // 设置有布局管理器后，setBounds()就失效了。换句话说，setBounds()只有在没有布局管理器的情况下才有效。
		
		panelInternal.add(testButton);
		panelInternal.add(buttonInternal);
		desktopPane.add(panelInternal, new Integer(1));
		
		// the reason for non-using the inner hidden class is that the variable
		// that it will use is must be "final",
		// and this causes it can not be assigned in the inner hidden class.
		// So we use the inner class instead, which is parallel to the level
		// "method".
		buttonPersonel.addActionListener(new ButtonPersonelActionListener());

		buttonCount.addActionListener(new ButtonCountActionListener());
		buttonPayment.addActionListener(new ButtonPaymentActionListener());
		
//		System.out.println(panel.getWidth() + "\t" + panel.getHeight());
		System.out.println(panel.getPreferredSize());
		System.out.println(desktopPane.getPreferredSize());
		addComponentListener(new MyComponentListener());
		
		
	}
	
	private class MyComponentListener extends ComponentAdapter {

		@Override
		public void componentResized(ComponentEvent e) {
			// TODO Auto-generated method stub
			dimensionCurrent = getSize();
			System.out.println("componentResized: " + dimensionCurrent);
			desktopPaneWidth = dimensionCurrent.width - insets.left - insets.right;
			desktopPaneHeight = dimensionCurrent.height - 
					panel.getPreferredSize().height - insets.top - insets.bottom;
			System.out.println("desktopPaneWidth: " + desktopPaneWidth + 
					"\tdesktopPaneHeight: " + desktopPaneHeight);
			
			/* use the getScaledInstance() to scale the image */
			Image image = Toolkit.getDefaultToolkit().getImage(resource); // is more efficient than ImageIO.read()
			ImageIcon imageIcon = new ImageIcon(image.getScaledInstance(
					desktopPaneWidth, desktopPaneHeight, Image.SCALE_FAST));
			backLabel.setIcon(imageIcon);
			backLabel.setBounds(0, 0, imageIcon.getIconWidth(),
					imageIcon.getIconHeight());
			
//			/* use the AffineTransform to scale the image (it turns out that 
//			 * this method is less efficient than getScaledInstance()) */
//			BufferedImage bufferedImage;
//			try {
//				bufferedImage = ImageIO.read(resource);
//				BufferedImage bufferedImageScaled = ImageScale.scale(
//						bufferedImage, desktopPaneWidth, desktopPaneHeight, 1);
//				ImageIcon imageIcon = new ImageIcon(bufferedImageScaled);
//				backLabel.setIcon(imageIcon);
//				backLabel.setBounds(0, 0, imageIcon.getIconWidth(),
//						imageIcon.getIconHeight());
//			} catch (IOException e1) {
//				// TODO Auto-generated catch block
//				e1.printStackTrace();
//			}
			
			panelInternal.setBounds(0, 0, desktopPaneWidth, desktopPaneHeight);
		}
		
	}

	private class ButtonPersonelActionListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub

			if (internalFramePersonel == null
					|| internalFramePersonel.isClosed()) {
				JInternalFrame[] allFrames = desktopPane.getAllFrames();
				int titleBarHight = 30 * allFrames.length;
				int x = titleBarHight + 10;
				int y = x;
				int width = 250;
				int height = 180;
				internalFramePersonel = new JInternalFrame("人事管理", true, true,
						true, true);
				internalFramePersonel.setVisible(true);
				internalFramePersonel.setBounds(x, y, width, height);
				desktopPane.add(internalFramePersonel);
			}

			try {
				// indispensable for the visualization of the internal frame
				internalFramePersonel.setSelected(true);
			} catch (PropertyVetoException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}

		}
	}

	private class ButtonCountActionListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub

			if (internalFrameCount == null || internalFrameCount.isClosed()) {
				JInternalFrame[] allFrames = desktopPane.getAllFrames();
				int titleBarHight = 30 * allFrames.length;
				int x = titleBarHight + 10;
				int y = x;
				int width = 250;
				int height = 180;
				internalFrameCount = new JInternalFrame("帐套管理", true, true,
						true, true);
				internalFrameCount.setVisible(true);
				internalFrameCount.setBounds(x, y, width, height);
				URL resource = this.getClass().getResource("/images/Luxun.jpg");
				BufferedImage imageScaled = null;
				BufferedImage in;
				try {
					in = ImageIO.read(resource);
					imageScaled = ImageScale.scale(in, 0.05, 0.05, 1);
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				ImageIcon imageIcon = new ImageIcon(imageScaled);
				internalFrameCount.setFrameIcon(imageIcon);
				desktopPane.add(internalFrameCount);
			}

			try {
				// indispensable for the visualization of the internal frame
				internalFrameCount.setSelected(true);
			} catch (PropertyVetoException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}

		}
	}

	private class ButtonPaymentActionListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub

			if (internalFramePayment == null || internalFramePayment.isClosed()) {
				JInternalFrame[] allFrames = desktopPane.getAllFrames();
				int titleBarHight = 30 * allFrames.length;
				int x = titleBarHight + 10;
				int y = x;
				int width = 250;
				int height = 180;
				internalFramePayment = new JInternalFrame("待遇管理", true, true,
						true, true);
				internalFramePayment.setVisible(true);
				internalFramePayment.setBounds(x, y, width, height);
				URL resource = this.getClass().getResource("/images/Luxun.jpg");
				BufferedImage imageScaled = null;
				BufferedImage in;
				try {
					in = ImageIO.read(resource);
					imageScaled = ImageScale.scale(in, 0.05, 0.05, 1);
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				ImageIcon imageIcon = new ImageIcon(imageScaled);
				internalFramePayment.setFrameIcon(imageIcon);
				desktopPane.add(internalFramePayment);
			}

			try {
				// indispensable for the visualization of the internal frame
				internalFramePayment.setSelected(true);
			} catch (PropertyVetoException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		JInternalFrame_1 frame = new JInternalFrame_1();
		frame.setTitle("企业人事管理系统 ");
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setBounds(100, 100, 570, 470);
		/* obtain the frame border */
		insets = frame.getInsets();
		System.out.println(insets);
		
		System.out.println(desktopPane.getSize());
		System.out.println(container.getSize());
		System.out.println(frame.getSize());
		System.out.println(panel.getSize());
		
	}

}