Creating the User Interface for the Voice Synthesizer Application

Creating the User Interface for the Voice Synthesizer Application

The TextPad.java file creates the user interface for the Voice Synthesizer application. Listing 3-1 shows the contents of the TextPad.java file:

Listing 3-1: The TextPad.java File

 /* Import required awt classes */ import java.awt.BorderLayout; import java.awt.GridLayout; /* Import required awt event classes */ import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.KeyListener; import java.awt.event.KeyEvent; /* Import required swing classes */ import javax.swing.JOptionPane; import javax.swing.event.*; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JButton; import javax.swing.JLabel; import javax.swing.JFrame; import javax.swing.JFileChooser; import javax.swing.JTextArea; import javax.swing.JScrollPane; import javax.swing.UIManager; /* Import required io classes */ import java.io.File; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStreamReader; import java.io.IOException; import java.io.FileWriter; /* Class: TextPad-Creates the user interface for the textpad Methods: actionPerformed(): Defines the actions to be performed, when user clicks any button or menu item. open(): Opens the file selected by the end user in the text area of the text pad. setvoice(): Sets the voice of the synthesizer that speaks the text to the selected voice. main():Creates the main window of the application. */ public class TextPad extends JFrame implements ActionListener, Runnable, KeyListener {    /* Declare variables to create the menu */    JMenuBar menubar;    JMenu fileMenu;    JMenu voiceMenu;    JMenuItem open,newFile, save, exit, selVoice, speak, pause, stop, resume;    /* Declare variables */    JButton speakText, stopText;    JPanel buttonPanel, textPanel;    JScrollPane scrollpane;    JFileChooser filechooser;    JTextArea textarea;    File file;    String str;    String selectedVoice;    FileInputStream fin;    Thread t;    String speakstring;    /* Create an object of SelectVoice class */    SelectVoice sv=null;    /* Create an object of SpeakText class */    SpeakText st=null;    /*    TextPad(): Defines the default constructor for the TextPad application.    Parameters: NA    Return Value: NA    */    public TextPad()    {       setTitle("Voice Synthesizer Application");       /*        Set the look and feel for the application.       */       try       {          UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");       }       catch(Exception e)       {          System.out.println("Unknown Look and Feel." + e);          }       /* Set the size of user interface */       setSize(400,400);       /*        Set the resizable property of JFrame class to false       */       setResizable(false);       /*       Initialize the JPanels for the application       */       sv=new SelectVoice(this);       /* Initialize the JPanels */       buttonPanel=new JPanel();       textPanel=new JPanel();       /* Set the Layout for JPanels */       buttonPanel.setLayout(new GridLayout(1, 2));       textPanel.setLayout(new BorderLayout());       /* Initialize and set the JMenuBar */       menubar = new JMenuBar();       setJMenuBar(menubar);       /*        Initialize and create File and Voice menu       */       fileMenu = new JMenu("File");       voiceMenu = new JMenu("Voice");       /* Add menus to JMenuBar */       menubar.add(fileMenu);       menubar.add(voiceMenu);       /* Initialize new JMenuItems */       newFile=new JMenuItem("New (Alt+F+N)");       open = new JMenuItem("Open Alt+F+O)");       save=new JMenuItem("Save (Alt+F+S)");       exit=new JMenuItem("Exit (Alt+F+E)");       selVoice=new JMenuItem("Select Voice (Alt+V+I)");       speak=new JMenuItem("Speak (Alt+V+P)");       stop=new JMenuItem("Stop (Alt+V+T)");       pause=new JMenuItem("Pause (Alt+V+A)");       resume=new JMenuItem("Resume (Alt+V+R)");       /* Set Mnemonics for the JMenuItems */       fileMenu.setMnemonic('F');       voiceMenu.setMnemonic('V');       open.setMnemonic('O');       save.setMnemonic('S');       exit.setMnemonic('E');       selVoice.setMnemonic('I');       speak.setMnemonic('P');       stop.setMnemonic('T');       pause.setMnemonic('A');       resume.setMnemonic('R');       newFile.setMnemonic('N');       /* Add menu items to the file menu */       fileMenu.add(newFile);       fileMenu.add(open);       fileMenu.add(save);          fileMenu.addSeparator();       fileMenu.add(exit);       /* Add menu items to the voice menu */       voiceMenu.add(selVoice);       voiceMenu.add(speak);       voiceMenu.addSeparator();       voiceMenu.add(stop);       voiceMenu.add(pause);       voiceMenu.add(resume);       /*       Add action listener to the menu items       */       newFile.addActionListener(this);       open.addActionListener(this);       save.addActionListener(this);       exit.addActionListener(this);       selVoice.addActionListener(this);       speak.addActionListener(this);       stop.addActionListener(this);       pause.addActionListener(this);       resume.addActionListener(this);       save.setEnabled(false);       /* Initialize new JButtons */       speakText=new JButton("Speak");       stopText=new JButton("Stop");       /*       Set the enables property of JButton and menu items to false       */       stopText.setEnabled(false);       stop.setEnabled(false);       pause.setEnabled(false);       resume.setEnabled(false);       /* Add action listener to JButtons */       speakText.addActionListener(this);       stopText.addActionListener(this);       /* Add buttons to button panel */       buttonPanel.add(speakText);       buttonPanel.add(stopText);       /* Initialize new text area */       textarea=new JTextArea();       /* Set the properties of text area */       textarea.setLineWrap(true);       textarea.setWrapStyleWord(true);       textarea.addKeyListener(this);       /*       Initialize new JScrollpane and add text area to scroll pane       */       scrollpane=new JScrollPane(textarea);       /*       Add button panel and scroll pane to text panel       */       textPanel.add(scrollpane, BorderLayout.CENTER);       textPanel.add(buttonPanel, BorderLayout.NORTH);       /*       Set the default value of selected voice to kevin16       */       selectedVoice=new String("kevin16");       /* Add textpanel to the main window */       getContentPane().add(textPanel);       /*       Add new window listener to the main window       */       addWindowListener(new WindowAdapter()       {          public void windowClosing(WindowEvent we)          {             System.exit(0);          }       });    } /*  Handle the key typed event from the text field  */ public void keyTyped(KeyEvent e)  { } /* Handle the key pressed event from the text field  */ public void keyPressed(KeyEvent e)  { } /* Handle the key released event from the text field */ public void keyReleased(KeyEvent e)  {    if (e.getSource()==textarea)    {       if ((textarea.getText()).length()==0)       {          save.setEnabled(false);       }       else       {          save.setEnabled(true);       }       } } /* actionPerformed(): Defines the operations to be performed, when the user clicks a button or selects a menu item. Parameters: ev: An object of ActionEvent class. Return Type: NA */ public void actionPerformed(ActionEvent ev) {    /*    Executes when the user clicks the speak button or speak menu item    */    if((ev.getSource()==speakText)(ev.getSource()==speak))    {       /*       Set the value of the selSpeak to the selected text       */       String selSpeak=textarea.getSelectedText();       /* Check if no text is selected */       if(selSpeak==null)       {          speakstring=textarea.getText();          /*          Check if no text is available in the textarea of the text pad          */          if(speakstring.equals(""))          speakstring="Empty File, Please open a file and then click the Speak button";       }       else       speakstring=selSpeak;       stopText.setEnabled(true);       speakText.setEnabled(false);       pause.setEnabled(true);       resume.setEnabled(true);       stop.setEnabled(true);       t=new Thread(this,"Button action");       t.start();    }    else    /*    Executes when the user clicks the stop button or stop menu item    */    if((ev.getSource()==stopText)(ev.getSource()==stop))    {       /*       Invoke the closeSynthesizer() method of SpeakText class       */       t.stop();       st.closeSynthesizer();       stop.setEnabled(false);       pause.setEnabled(false);       resume.setEnabled(false);       speakText.setEnabled(true);       stopText.setEnabled(false);    }    else    /*    Executes when the user clicks the New menu item    */    if(ev.getSource()==newFile)    {       textarea.setText("");       textarea.setEditable(true);    }    else    /*    Executes when the user clicks the Open menu item    */    if(ev.getSource()==open)    {       try       {             /*          Initialize a new JFileChooser          */          filechooser=new JFileChooser();          /*          Create and set a new FileFilter for the JFileChooser          */          filechooser.setFileFilter(new javax.swing.filechooser.FileFilter()          {             public boolean accept(File f)             {                if(f.isDirectory())                {                   return true;                }                String name=f.getName();                /*                Allows only text and java files to be opened in the user interface of text pad                */                if ((name.endsWith(".txt"))(name.endsWith(".java")))                {                   return true;                }                return false;             }             public String getDescription()             {                 return "Text Files";             }         });          /*          Open the JFileChooser          */          filechooser.showOpenDialog(this);          file = filechooser.getSelectedFile();          if(file==null)          {             System.out.println("No file Selected");          }          else          {             /*             Check if the selected file is a valid file             */             if(file.isFile())             {                str = file.getAbsolutePath();                open();             }             else             {                /*                Print the error message if the selected file is not a valid file                */                JOptionPane.showMessageDialog(null, "The selected file is not a valid File", "Select                another File", JOptionPane.WARNING_MESSAGE);             }        }    }    catch(Exception e)     {       System.out.println("Error" + e);       } } else /* Executes if the user clicks the resume menu item */ if(ev.getSource()==resume) {    /*    Invoke the resumeSynthesizer() method of the SpeakText class    */    t.resume();    st.resumeSynthesizer();    stop.setEnabled(true);    stopText.setEnabled(true);    pause.setEnabled(true); } else /* Executes if the user clicks the pause button */ if(ev.getSource()==pause) {    /*    Invoke the pauseSynthesizer() method of the SpeakText class    */    t.suspend();    st.pauseSynthesizer();    resume.setEnabled(true); } else /* Executes if the user clicks the exit button */ if(ev.getSource()==exit) {    System.exit(0); } else /* Executes if the user clicks the Select voice menu item */ if(ev.getSource()==selVoice) {    sv.setVisible(true); } else /* Executes if the user clicks the save menu item */ if(ev.getSource()==save) {    if(textarea.getText().equals(""))    JOptionPane.showMessageDialog(null,"No file open or empty    file","Warning",JOptionPane.WARNING_MESSAGE);    else    {       /* Displays the save dialog box */       if(filechooser.showSaveDialog(TextPad.this) == JFileChooser.APPROVE_OPTION)       {          File fSelected = filechooser.getSelectedFile();          try          {             FileWriter out = new FileWriter(fSelected);             textarea.write(out);             out.close();          }           catch(IOException ioe)           {             ioe.printStackTrace();          }                   }    }          } } /* run(): Runs new thread. Parameters: NA Return Type: NA */ public void run() {    /*    Initialize a new object of SpeakText class    */    st=new SpeakText(speakstring, selectedVoice);    /*    Invoke the speakSelText() method of SpeakText class    */    st.speakSelText(this);    /*    Enable the stop button, pause and resume menu items    */ } /* Executes if the user clicks the Open menu item */ public void open()  {    try    {       /* Initialize a new FileInputStream */       fin = new  FileInputStream(filechooser.getSelectedFile().getAbsolutePath());       /*       Initialize a new object of BufferedReader class       */       BufferedReader br = new BufferedReader(new InputStreamReader(fin));       String readLine = "";       textarea.setText("");       while ((readLine = br.readLine())!=null)       {          textarea.setText(textarea.getText()+ "\n" +readLine);       }       if(textarea.getText()==null)       {          JOptionPane.showMessageDialog(null, "The file has no content", "Select           another File", JOptionPane.WARNING_MESSAGE);       }       fin.close();       }       catch(IOException ioe)       {          System.err.println("I/O Error on Open");       }    }    /*    setvoice(): retrieves the voice selected by the end user.    Parameters:    str: String representing the voice selected by the end user    Return Type: NA    */    public void setvoice(String str)    {       selectedVoice=str;       System.out.println(selectedVoice);    }    /*    main(): Creates an object of TextPad.java  class.    Parameters:    str[]: String array to store the command line parameters.    Return Type: NA    */    public static void main(String str[])    {       TextPad tp=new TextPad();       tp.setVisible(true);    } } 

 

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In the above code, the main() method creates an instance of the TextPad.java class.

The methods defined in Listing 3-1 are:

• actionPerformed (): Acts as an event listener and activates an appropriate method, based on the menu option selected by an end user. This method is invoked when an end user selects an option from the File menu.

• open (): Opens the file selected by an end user and displays the contents of the selected file in the text area.

• setvoice (): Sets the voice of the synthesizer that reads out the text in the selected voice.

The TextPad.java file generates the main window of the Voice Synthesizer application, as shown in Figure 3-2:

Figure 3-2: User Interface of the Voice Synthesizer Application

Figure 3-3 shows the File menu options of the Voice Synthesizer application:

Figure 3-3: The File Menu of the Voice Synthesizer Application

To create a new file to write text, end users need to select File-> New.

To open an existing file, end users need to select File->Open. The Open dialog box appears, as shown in Figure 3-4. Click the Open button in the Open dialog box after selecting the required file.

Figure 3-4: The Open Dialog Box

The application terminates if end users select File->Exit.

Figure 3-5 shows the Voice menu options of the Voice Synthesizer application:

Figure 3-5: The Voice Menu

To convert text to speech, end users need to select Voice->Speak. The Voice Synthesizer reads out the text in the voice selected by the end user.