// SwingGUIs.java
// One of each Swing GUI in JApplet with FlowLayout
// Event handlers are this
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class SwingGUIs extends JApplet 
    implements ActionListener, ItemListener, ListSelectionListener {

    private JLabel myLabel;
    private JTextField myTextField;
    private JPasswordField myPasswordField;
    private JButton myButton, myButton2;
    private JCheckBox myCheckBox1, myCheckBox2;
    private JRadioButton myRadioButton1, myRadioButton2;
    private ButtonGroup myButtonGroup;
    private JComboBox myComboBox;
    private JList myList;
    private JTextArea myTextArea;
    String [] names = {"fred", "jane", "steve", "susan", "bob"};

   public void init() {
      // get applet's content pane and change its layout to FlowLayout
      Container container = getContentPane();  
      container.setLayout( new FlowLayout() ); 
      container.setBackground(Color.MAGENTA);

      myLabel = new JLabel( "My JLabel" );
      container.add( myLabel );

      myTextField = new JTextField( "My JTextField", 20 );
      container.add( myTextField );
      //myTextField.setEditable( false );
      myTextField.addActionListener( this ); 

      myPasswordField = new JPasswordField( "Type your password here",20 );
      container.add( myPasswordField );
      myPasswordField.addActionListener( this ); 

      myButton = new JButton( "My JButton" );
      container.add( myButton );
      myButton.addActionListener( this ); 


      myCheckBox1 = new JCheckBox( "My JCheckBox 1" );
      container.add( myCheckBox1 );
      //***handler is the itemStateChanged() below. 
      myCheckBox1.addItemListener( this ); 

      myCheckBox2 = new JCheckBox( "My JCheckBox 2", true );
      container.add( myCheckBox2 );
      myCheckBox2.addItemListener( this ); 


      myRadioButton1 = new JRadioButton( "My JRadioButton 1" );
      container.add( myRadioButton1 );
      //***handler is the itemStateChanged() below. 
      myRadioButton1.addItemListener( this ); 

      myRadioButton2 = new JRadioButton( "My JRadioButton 2" );
      container.add( myRadioButton2 );
      myRadioButton2.addItemListener( this ); 

      //ButtonGroup makes radio buttons act as a group of radio buttons
      myButtonGroup = new ButtonGroup();
      myButtonGroup.add(myRadioButton1);
      myButtonGroup.add(myRadioButton2);
      //ButtonGroup NOT added to container
      //ButtonGroup does not have a handler

      myComboBox = new JComboBox(names);
      myComboBox.setMaximumRowCount(3);
      container.add( myComboBox );
      //handler is the itemStateChanged() below. 
      myComboBox.addItemListener( this );


      myList = new JList(names);
      myList.setVisibleRowCount(3);
      myList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      container.add(new JScrollPane(myList));
      //container.add(myList);
      //***handler is the valueChanged() below. 
      myList.addListSelectionListener( this );

      myButton2 = new JButton( "My useless JButton" );
      container.add( myButton2, 6 );  //insert into position 6
      myButton2.addActionListener( this ); 
      //but the handler ignores it so nothing will happen when clicked.

      //create a textarea, attach a scrollbar, add to container.
      //textarea is like DOS box and println. 
      myTextArea = new JTextArea(10,40);  //rows,columns
      container.add( new JScrollPane(myTextArea));

   }

    public void paint (Graphics g) {
	super.paint(g);
	//draw random line to see if alive
	g.drawLine((int)(Math.random()*getWidth()),
		   (int)(Math.random()*getHeight()),
		   (int)(Math.random()*getWidth()),
		   (int)(Math.random()*getHeight()));
    }

    // event handler for JButton, JTextField and JPasswordField events
    public void actionPerformed( ActionEvent event ) {
	if ( event.getSource() == myButton ) {
	    JOptionPane.showMessageDialog(null,"myButton got it");
	    myTextArea.append("myButton pressed\n");
	}
	else if ( event.getSource() == myTextField ) {
	    JOptionPane.showMessageDialog(null,"myTextField got it one way: " +
					  event.getActionCommand() );
	    JOptionPane.showMessageDialog(null,"myTextField got it other way: " +
					  myTextField.getText() );
	    myTextArea.append("myTextField: " + myTextField.getText() + "\n");
	    //myTextField.setText( "" );
	}
	else if ( event.getSource() == myPasswordField ) {
	    JOptionPane.showMessageDialog(null,"myPasswordField got it: " +
					  event.getActionCommand()+ "  oops" );
	    myTextArea.append("myPasswordField entered\n");
	    //myPasswordField.setText( "" );
	}
    } 
    


    // event handler for JCheckBox, JRadioButton and JComboBox events
    public void itemStateChanged( ItemEvent event ) {
	if ( event.getSource() == myCheckBox1 ) {
	    if (event.getStateChange() == ItemEvent.SELECTED) {
		JOptionPane.showMessageDialog(null,"myCheckBox 1 selected");
		myTextArea.append("myCheckBox 1 selected\n");
	    }
	    else if (event.getStateChange() == ItemEvent.DESELECTED) {
		JOptionPane.showMessageDialog(null,"myCheckBox 1 deselected");
		myTextArea.append("myCheckBox 1 deselected\n");
	    }
	}
	else if ( event.getSource() == myCheckBox2 ) {
	    if ( myCheckBox2.isSelected() ) {   //alternate way
		JOptionPane.showMessageDialog(null,"myCheckBox 2 selected");
		myTextArea.append("myCheckBox 2 selected\n");
	    }
	    else if ( ! myCheckBox2.isSelected() ) {
		JOptionPane.showMessageDialog(null,"myCheckBox 2 deselected");
		myTextArea.append("myCheckBox 2 deselected\n");
	    }
	}
	else if ( event.getSource() == myRadioButton1 ) {
	    if ( myRadioButton1.isSelected() ) {   //alternate way
		JOptionPane.showMessageDialog(null,"myRadioButton 1 selected");
		myTextArea.append("myRadioButton 1 selected\n");
	    }
	}
	else if ( event.getSource() == myRadioButton2 ) {
	    if ( myRadioButton2.isSelected()) {    //alternate way
		JOptionPane.showMessageDialog(null,"myRadioButton 2 selected");
		myTextArea.append("myRadioButton 2 selected\n");
	    }
	}

	else if ( event.getSource() == myComboBox ) {
	    if ( event.getStateChange() == ItemEvent.SELECTED ) {
		int i = myComboBox.getSelectedIndex();
		JOptionPane.showMessageDialog(null,"myComboBox selected index:" +
						i +
						"\nitem value: " +
						names[i]);
	    myTextArea.append("myComboBox selected index: " +
		               i + "   item value: " + names[i] + "\n");
	    }
					      
	}

    } 

    //event handler for JList
    public void valueChanged( ListSelectionEvent event ) {
	if ( event.getSource() == myList ) {
            int i = myList.getSelectedIndex();
	    JOptionPane.showMessageDialog(null,"myList index: " +
					  i +
					"\nitem value: " +
					names[i]);
	    myTextArea.append("myList selected index: " +
	                       i + "   item value: " + names[i] + "\n");
	}				  

    }
}