import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class SwingAppletDemo extends JApplet
    implements ActionListener, ItemListener,
    ListSelectionListener, ChangeListener  {

    private JButton button1, button2, button3, button4;
    private JLabel label1;
    private JCheckBox checkBox1;

    private ButtonGroup radioButtons;
    private JRadioButton hotRadio, warmRadio, coldRadio;

    private JComboBox combo1;

    private JList list1;
    private DefaultListModel listModel;
    private JTextField textField1;

    private JSlider slider1;

    private JTextArea textArea1;
    Paper paper;

    public void init() {
        Container c=getContentPane();
        c.setLayout(new FlowLayout() );

        label1= new JLabel("Some basic Swing:");
        c.add(label1);

        checkBox1= new JCheckBox("-A JCheckBox");
        c.add(checkBox1);
        checkBox1.addItemListener(this);

        hotRadio = new JRadioButton("hot",false);
        c.add(hotRadio);
        hotRadio.addItemListener(this);

        warmRadio = new JRadioButton("warm",false);
        c.add(warmRadio);
        warmRadio.addItemListener(this);

        coldRadio  = new JRadioButton("cold",false);
        c.add(coldRadio);
        coldRadio.addItemListener(this);

        radioButtons = new ButtonGroup();
        radioButtons.add(hotRadio);
        radioButtons.add(warmRadio);
        radioButtons.add(coldRadio);

        combo1= new JComboBox();
        combo1.addItem("Red");
        combo1.addItem("Yellow");
        combo1.addItem("Blue");
        combo1.addActionListener(this);
        c.add(combo1);

        button1 = new JButton("Message dialog");
        c.add(button1);
        button1.setToolTipText("click to see a message dialog");
        button1.addActionListener(this);

        button2 = new JButton("Confirm dialog");
        c.add(button2);
        button2.addActionListener(this);

        button3 = new JButton("Input dialog");
        c.add(button3);
        button3.addActionListener(this);

        button4 = new JButton("Draw circle");
        c.add(button4);
        button4.addActionListener(this);

        listModel = new DefaultListModel();
        listModel.addElement("Mike");
        listModel.addElement("Maggie");
        listModel.addElement("Matthew");
        listModel.addElement("Eleanor");

        list1 = new JList(listModel);
        list1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        c.add(list1);
        list1.addListSelectionListener(this);

        textField1 = new JTextField(15);
        textField1.setText("A JTextField: type here...");
        c.add(textField1);
        textField1.addActionListener(this);

        // a text area in a scroll pane
        textArea1 = new JTextArea(" A JTextArea");
        textArea1.setLineWrap(true);
        JScrollPane areaScrollPane = new JScrollPane(textArea1);
        areaScrollPane.setVerticalScrollBarPolicy(
            JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        areaScrollPane.setHorizontalScrollBarPolicy(
            JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        areaScrollPane.setPreferredSize(new Dimension(100,200));
        c.add(areaScrollPane);

        // a panel in a scroll pane
        paper = new Paper();
        JScrollPane paperScrollPane = new JScrollPane(paper);
        paperScrollPane.setPreferredSize(new Dimension(100,200)); 
        c.add(paperScrollPane);

        slider1 = new JSlider(JSlider.HORIZONTAL, 0, 10, 5);
        slider1.setMajorTickSpacing(10);
        slider1.addChangeListener(this);
        slider1.setMinorTickSpacing(1);
        slider1.setPaintTicks(true);
        slider1.setPaintLabels(true);
        c.add(slider1);
    }


    public void actionPerformed(ActionEvent e) {
        if (e.getSource()== button1) {
            JOptionPane.showMessageDialog(null, "A message:\n"+
               "The  Combo state is: " + combo1.getSelectedIndex());
        }

        if (e.getSource()== button2) {
            int userResponse = JOptionPane.showConfirmDialog(null,
                "Delete files?");
            if (userResponse == JOptionPane.NO_OPTION)
                JOptionPane.showMessageDialog(null,
                    "No - Files not deleted!");

            else if (userResponse == JOptionPane.YES_OPTION)
                JOptionPane.showMessageDialog(null,
                    "Yes - Files deleted (just pretending!)");

            else if (userResponse == JOptionPane.CANCEL_OPTION)
                JOptionPane.showMessageDialog(null, "You cancelled");

            else if (userResponse == JOptionPane.CLOSED_OPTION)
              // user closed the dialog - could treat as 'Cancel'
              JOptionPane.showMessageDialog(null, "You closed");

        }

        if (e.getSource()== button3) {

            String bookTitle = JOptionPane.showInputDialog(null,
                "Enter book title");
            if (bookTitle == null)
                JOptionPane.showMessageDialog(null, "You cancelled");
            else
                JOptionPane.showMessageDialog(null, "Title is: "
                    + bookTitle);
        }

        if(e.getSource() == button4) {
            paper.setDiameter(55);
            paper.display();
        }

        if(e.getSource()==combo1){
            int n=combo1.getSelectedIndex();
            JOptionPane.showMessageDialog(null, "combo item number "+
                n + ": the string is: "+combo1.getSelectedItem());
        }
        if (e.getSource()== textField1)
            JOptionPane.showMessageDialog(null,"You hit enter " +
                "on textfield. Text is:\n"+ textField1.getText());
    }

    public void itemStateChanged(ItemEvent e) {
        if (e.getSource() == checkBox1)
                 JOptionPane.showMessageDialog(null,
                     "checkBox changed to: "+checkBox1.isSelected());

        if (e.getSource()== hotRadio)
            JOptionPane.showMessageDialog(null, " hot clicked");

        if (e.getSource()== warmRadio)
            JOptionPane.showMessageDialog(null, "warm clicked"+
                coldRadio.isSelected());

        if (e.getSource()== coldRadio)
               JOptionPane.showMessageDialog(null, "cold clicked"+
                      coldRadio.isSelected());
    }



    public void valueChanged(ListSelectionEvent e) {
        if(e.getSource()==list1)
            JOptionPane.showMessageDialog(null,
                "Chose list item number:"+list1.getSelectedIndex());

   }

    public void stateChanged(ChangeEvent e) {
        if (e.getSource()== slider1)      
            textArea1.append("\nslider1 is: " + slider1.getValue());
    }
}

class Paper extends JPanel {   // to draw on
    int diameter =400;

    public void setDiameter(int d) {
        diameter = d;
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawOval(0,0,diameter,diameter);
        g.drawString("Jpanel drawing", 0, 20);
    }

    public void display() {
        repaint();
    }
}