mainmenu.java

这是一个从音频信号里提取特征参量的程序

// file: MainMenu.java
//

// import necessary java libraries
//
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import java.net.*;
import java.applet.*;

// class: MainMenu
//
// implement the menu driven system that drives the applet
//
// hierarchy: MainMenu
//
class MainMenu extends JPanel implements ActionListener, Constants {

    // ---------------------------------------------------    
    //
    // declare global variables
    //
    // ---------------------------------------------------    

    // creates a fram to manipulate the configuration options
    //
    public JFrame config = null;

    // textfields and labels for the connector properties
    //
    public JLabel nameLabel = null;
    public JTextField nameField = null;
    
    // declare a reference to the DiGraph
    //
    public DiGraph digraph = null;

    // menu that holds all functionality
    //
    public JMenu menu = null;
    public JMenu subMenu = null;
    public JMenu subSubMenu = null;
    public JMenuBar menuBar = null;
    public JMenuItem menuItem = null;

    // declare a frame to display the help message
    //
    JFrame helpFrame = null;

    // declare a text area to display documentation
    //
    public JTextArea textArea = null;
    
    // declare a scrollable pane for the text area
    //
    public JScrollPane scrollPane = null;

    // declare the layout manager
    //
    public GridBagLayout gridbag = new GridBagLayout();
    
    // ---------------------------------------------------        
    //
    // declare class constructors
    //
    // ---------------------------------------------------    
   
    // method: MainMenu
    //
    // arguments:
    //
    // returns  : none
    //
    // constructor initializes objects and containers
    //
    MainMenu(DiGraph DiGraph) {
	
	super();

	// set the default layout
	//
	setLayout(gridbag);

	// set the reference to vertex box
	//
	digraph = DiGraph;

	// instantiate the frame
	//
	helpFrame = new JFrame("Help");

	// instantiate the text area to display documentation
	//
	textArea = new JTextArea();
	textArea.setLineWrap(true);
	textArea.setWrapStyleWord(true);
	textArea.setEditable(false);
	
	// instantiate the scrollable pane for the text area
	//
	scrollPane = new JScrollPane(textArea);

	// set the scroll pane dismensions
	//
	scrollPane.setSize(new Dimension(HELP_WIDTH, HELP_HEIGHT));
	scrollPane.setPreferredSize(new Dimension(HELP_WIDTH, HELP_HEIGHT));
	scrollPane.setMinimumSize(new Dimension(HELP_WIDTH, HELP_HEIGHT));
	scrollPane.setMaximumSize(new Dimension(HELP_WIDTH, HELP_HEIGHT));

	// initialize the menu bar
	//
	menuBar = new JMenuBar();

	// create the file menu
	//	
	menu = new JMenu(fileStr);
	menu.setFont(newFont);
	menuBar.add(menu);

	// add the menu items
	//
	menuItem = new JMenuItem(clearStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, 
						       ActionEvent.ALT_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(clearStr);
	menu.add(menuItem);

	menuItem = new JMenuItem(openStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, 
						       ActionEvent.CTRL_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(openStr);
	menu.add(menuItem);

	menuItem = new JMenuItem(saveStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, 
						       ActionEvent.CTRL_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(saveStr);
	menu.add(menuItem);

	menuItem = new JMenuItem(saveAsStr);
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(saveAsStr);
	menu.add(menuItem);

	menu.addSeparator();

	menuItem = new JMenuItem(quitStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, 
						       ActionEvent.ALT_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(quitStr);
	menu.add(menuItem);

	// create the edit menu
	//
	menu = new JMenu(editStr);
	menu.setFont(newFont);
	menuBar.add(menu);

	menuItem = new JMenuItem(cutStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, 
						       ActionEvent.CTRL_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(cutStr);
	menu.add(menuItem);

	menuItem = new JMenuItem(copyStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, 
						       ActionEvent.CTRL_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(copyStr);
	menu.add(menuItem);

	menuItem = new JMenuItem(pasteStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, 
						       ActionEvent.CTRL_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(pasteStr);
	menu.add(menuItem);

	menu.addSeparator();

	menuItem = new JMenuItem(insArcStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, 
						       ActionEvent.ALT_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(insArcStr);
	menu.add(menuItem);

	menuItem = new JMenuItem(insSelfArcStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, 
						       ActionEvent.ALT_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(insSelfArcStr);
	menu.add(menuItem);

	menu.addSeparator();

	menuItem = new JMenuItem(delArcStr);
        menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z, 
						       ActionEvent.ALT_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(delArcStr);
	menu.add(menuItem);

	menuItem = new JMenuItem(delBlkStr);
	menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D, 
						       ActionEvent.ALT_MASK));
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(delBlkStr);
	menu.add(menuItem);

	// create the vertex menu
	//
	menu = new JMenu(compStr);
	menu.setFont(newFont);
	menuBar.add(menu);

	menuItem = new JMenuItem(startStr);
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(startStr);
	menu.add(menuItem);
	
	menuItem = new JMenuItem(termStr);
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(termStr);
	menu.add(menuItem);

	menu.addSeparator();
	
	menuItem = new JMenuItem("Node");
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(contStr);
	menu.add(menuItem);

	// create the utility menu
	//
	menu = new JMenu(utiStr);
	menu.setFont(newFont);
	menuBar.add(menu);

	menuItem = new JMenuItem(digraphStr);
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(digraphStr);
	menu.add(menuItem);

	menuItem = new JMenuItem(loadDigraphStr);
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(loadDigraphStr);
	menu.add(menuItem);

	menu.addSeparator();

	menuItem = new JMenuItem(lmTesterStr);
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(lmTesterStr);
	menu.add(menuItem);

	// create the help menu
	//
	menu = new JMenu(helpStr);
	menu.setFont(newFont);
	menuBar.add(Box.createHorizontalGlue());
	menuBar.add(menu);

	menuItem = new JMenuItem(overviewStr);
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(overviewStr);
	menu.add(menuItem);

	menu.addSeparator();

	menuItem = new JMenuItem(tutorialStr);
	menuItem.setFont(newFont);
	menuItem.addActionListener(this);
	menuItem.setActionCommand(tutorialStr);
	menu.add(menuItem);

	// set the dimensions of the menu
	//
	this.setSize(new Dimension(digraph.MAX_WIDTH, 30));
	this.setMinimumSize(new Dimension(digraph.MAX_WIDTH, 30));
	this.setMaximumSize(new Dimension(digraph.MAX_WIDTH, 30));
	this.setPreferredSize(new Dimension(digraph.MAX_WIDTH, 30));
    }
    
    // ---------------------------------------------------
    //
    // declare class methods
    //
    // ---------------------------------------------------
    
    // method: add_components
    //
    // arguments: none
    // return   : none
    //
    // adds components to the control panel
    //
    public void add_components () {
	
	constrain(this, menuBar, 0, 0, 
		  GridBagConstraints.REMAINDER, GridBagConstraints.REMAINDER,
		  GridBagConstraints.BOTH, GridBagConstraints.CENTER,
		  1, 1, 0, 0, 0, 0);
    }

    // method: actionPerformed
    //
    // arguments:
    //    ActionEvent e: action command that is fired
    //
    // return   : none
    //
    // method listens for actions taking place on text only menu items
    //
    public void actionPerformed(ActionEvent e) {

	// get the source of the action that just occured
	//
	String source = e.getActionCommand();

	// depending on the source of the event take the appropriate action
	//
	if(source.equals(openStr)) {
	    
	    JFileChooser loadChooser=null;
	    
	    if(digraph.paramFile != null) {
		loadChooser = new JFileChooser(digraph.paramFile);
	    }
	    else {
		String cwd = System.getProperty("user.dir");
	        loadChooser = new JFileChooser(cwd);
	    }

	    // set the font and button text for the load chooser
	    //
	    loadChooser.setFont(newFont);
	    String loadApprove = new String("Load");
	    loadChooser.setApproveButtonText(loadApprove);
	    
	    
	    // display the file chooser object
	    //
	    int returnVal = loadChooser.showOpenDialog(digraph);
	    
	    // check to see if a file was selected by the user
	    //
	    if (returnVal == JFileChooser.APPROVE_OPTION) {
		
		// retrieve the selected file
		//
		digraph.paramFile = loadChooser.getSelectedFile();
		
		// read the parameters to file
		//
		digraph.read();
	    } 

	} else if(source.equals(saveStr)) {
	 
	    boolean searchWord = digraph.fullNode();
	    if(!searchWord) {

		// display a warning message indicating that you cannot have
		// two vertices with the same name
		//
		JFrame frame = new JFrame("Warning");
		JOptionPane.showMessageDialog(frame, "Every node should have word list!");
	    }
	    else {

		// write the parameters to file
		//
		if (digraph.paramFile != null) {
		    digraph.write();
		}
		else {

		    // initialize the file chooser object
		    //
		    String cwd = System.getProperty("user.dir");
		    
		    JFileChooser saveChooser = new JFileChooser(cwd);
		
		    // set the font and button text for the save chooser
		    //
		    saveChooser.setFont(newFont);
		    String saveApprove = new String("Save");
		    saveChooser.setApproveButtonText(saveApprove);
		    
		    // display the file chooser object
		    //
		    int returnVal = saveChooser.showOpenDialog(digraph);
		
		    // check to see if a file was selected by the user
		    //
		    if (returnVal == JFileChooser.APPROVE_OPTION) {
			
			// retrieve the selected file
			//
			digraph.paramFile = saveChooser.getSelectedFile();
			
			// write the parameters to file
			//
			digraph.write();
		    }
		}
	    }
	} else if(source.equals(saveAsStr)) {
	    
 	    boolean searchWord = digraph.fullNode();
	    if(!searchWord) {

		// display a warning message indicating that you cannot have
		// two vertices with the same name
		//
		JFrame frame = new JFrame("Warning");
		JOptionPane.showMessageDialog(frame, "Every node should have word list!");
	    }
	    else {

		JFileChooser saveChooser = null;
		
		// initialize the file chooser object
		//
		if(digraph.paramFile != null) {
		    saveChooser = new JFileChooser(digraph.paramFile);
		}
		else {
		    String cwd = System.getProperty("user.dir");
		    saveChooser = new JFileChooser(cwd);
		}