mainframe.java

基于哈夫曼树的压缩解压程序源代码

package GUI;

import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

public class MainFrame extends JFrame implements ActionListener {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	JTabbedPane tabbedPane = null;

	JButton help;// The help button

	JButton exit;// The exit button

	public MainFrame() {
		Container container = getContentPane();
		// The Panel for compress
		JPanel panel1 = new CompressJPanel().getDefaultJPanel();
		// The panel for decompress
		JPanel panel2 = new DecompressJPanel().getDefaultJPanel();

		// The tabbedPanel
		tabbedPane = new JTabbedPane();
		tabbedPane.setTabPlacement(JTabbedPane.TOP);

		tabbedPane.addTab("Compress", panel1);
		tabbedPane.addTab("Decompress", panel2);

		// Use panel to hold Buttons help and exit
		help = new JButton("Help");
		exit = new JButton("Exit");
		JPanel panel = new JPanel();
		panel.add(help);
		panel.add(exit);

		// Add listener for the buttons help and exit
		help.addActionListener(this);
		exit.addActionListener(this);

		// Add tabbedPanel and panel into the container
		container.setLayout(new BorderLayout());
		container.add(tabbedPane, BorderLayout.CENTER);
		container.add(panel, BorderLayout.SOUTH);
	}

	public static void main(String[] args) {
		MainFrame frame = new MainFrame();
		frame.setTitle("Haffman compress and decompress");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(500, 400);
		frame.setVisible(true);
		frame.setResizable(false);

		// Make the frame be in the center of the screen
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		int screenWidth = screenSize.width;
		int screenHeight = screenSize.height;
		int x = (screenWidth - frame.getWidth()) / 2;
		int y = (screenHeight - frame.getHeight()) / 2;
		frame.setLocation(x, y);

	}

	// The listener of the buttons "Help" and "Exit"
	public void actionPerformed(ActionEvent e) {
		if (e.getActionCommand().equals("Help")) {
			String helpInfo = "Welcome to use this software!!\n";
			helpInfo += "                         Designed By Lin Ling\n\n";
			helpInfo += "\"Compress\" tag is for the compress function \n\n    1,click \"select\" button to choose the file which needs to be compressed\n";
			helpInfo += "    2,click \"compress to...\" button to choose the folder which is the target file\n";
			helpInfo += "    3,click \"OK\" button to begin the process\n";
			helpInfo += "    4,when the compression is finished, the area \"status\" will show the time of the compression \n\n";
			helpInfo += "\"Decompress\" tag is for the decompress function \n\n    1,click \"select\" button to choose the file which needs to be decompressed\n";
			helpInfo += "     (Attention:only the file with the suffix \'~\' is allowed )\n";
			helpInfo += "    2,click \"decompress to...\" button to choose the folder which is the target file\n";
			helpInfo += "    3,click \"OK\" button to begin the process\n";
			helpInfo += "    4,when the decompression is finished, the area \"status\" will show the time of the decompression \n\n";
			helpInfo += "         ";
			JOptionPane.showMessageDialog(null, helpInfo,
					"HaffmanTree compress and decompress",
					JOptionPane.INFORMATION_MESSAGE);
		} else if (e.getActionCommand().equals("Exit")) {
			System.exit(0);
		}
	}

}