/**
 * Java. Level 2. Lesson 4. Swing
 * Examples for lesson
 *
 * @author Sergey Iryupin
 * @version dated Sep 08, 2017
 */
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;

class J2Lesson4 extends JFrame {

    public static void main(String[] args) {
        new J2Lesson4();
    }
    
    J2Lesson4() {
        setTitle("GUI Demo");
        setBounds(500, 200, 800, 600);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLayout(new GridLayout(2, 2));
        JPanel[] jp = new JPanel[4];
        for (int i = 0; i < 4; i++) {
            jp[i] = new JPanel();
            add(jp[i]);
            jp[i].setBackground(new Color(100 + i*40, 100 + i*40, 100 + i*40));
        }

        // left up panel
        jp[0].setLayout(new BorderLayout());
        JTextArea jta = new JTextArea();
        JScrollPane jsp = new JScrollPane(jta);
        jp[0].add(jsp);

        // right up panel
        jp[1].setLayout(new FlowLayout());
        JRadioButton[] jrb = new JRadioButton[4];
        ButtonGroup bgr = new ButtonGroup();
        for (int i = 0; i < jrb.length; i++) {
            jrb[i] = new JRadioButton("Option #" + i);
            bgr.add(jrb[i]);
            jp[1].add(jrb[i]);
        }
        JCheckBox[] jcb = new JCheckBox[4];
        for (int i = 0; i < jcb.length; i++) {
            jcb[i] = new JCheckBox("Check #" + i);
            jp[1].add(jcb[i]);
        }

        // left down panel
        jp[2].setLayout(new FlowLayout());
        String[] comboStr = {"Item #1", "Item #2", "Item #3", "Item #4"};
        JComboBox<String> jcombo1 = new JComboBox<String>(comboStr);
        JComboBox<String> jcombo2 = new JComboBox<String>(comboStr);
        jp[2].add(jcombo1);
        jp[2].add(jcombo2);
        jcombo1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println(jcombo1.getSelectedItem().toString());
            }
        });

        // right down panel
        jp[3].setLayout(null);
        JSlider js = new JSlider();
        JLabel jlab = new JLabel("Value: 50");
        js.setMaximum(100);
        js.setMinimum(0);
        js.setValue(50);
        jp[3].add(jlab);
        jp[3].add(js);
        js.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent e) {
                jlab.setText("Value: " + js.getValue());
            }
        });
        jlab.setBounds(10,10,100,20);
        js.setBounds(20, 40, 300, 100);
        js.setBackground(new Color(160,255,160));

        // drop-down menu
        JMenuBar mainMenu = new JMenuBar();
        JMenu mFile = new JMenu("File");
        JMenu mEdit = new JMenu("Edit");
        JMenuItem miFileNew = new JMenuItem("New");
        JMenuItem miFileExit = new JMenuItem("Exit");
        setJMenuBar(mainMenu);
        mainMenu.add(mFile);
        mainMenu.add(mEdit);
        mFile.add(miFileNew);
        mFile.addSeparator();
        mFile.add(miFileExit);

        miFileExit.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });

        setVisible(true);
    }
}