import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JButton;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener;
import java.awt.Component;

/*
    Author:  James Tam
    Version: Novemember 4, 2015

    Learning concepts:
    * JTextArea
    * JScrollPane
    * GridBagLayout & GridBagConstraints
    * Adding components to GridBag with a generic addWidget 
      method
*/
public class MyFrame extends JFrame implements ActionListener
{
    private JTextArea text;
    private JButton button;
    private JScrollPane scrollPane;
    private GridBagLayout aLayout;
    private GridBagConstraints aConstraint;
 
    public MyFrame()
    {


        aLayout = new GridBagLayout();
        aConstraint = new GridBagConstraints();
        createControls();
        addWidget(button,0,0);
        addWidget(scrollPane,1,1);
        button.addActionListener(this);

        setSize(400,250);
  	   setVisible(true);
	   setLayout(aLayout);

    }

    public void addWidget(Component c,
                          int x, 
                          int y)
    {
        aConstraint.gridx = x;
        aConstraint.gridy = y;
        aLayout.setConstraints(c,aConstraint);
	   add(c);
    }

    public void createControls()
    {
        text = new JTextArea();
        scrollPane = new JScrollPane(text); 
	   text.setFont(new Font("Times",Font.BOLD, 16));
	   text.append("Default text");
        button = new JButton("Press me");
    }

    // Gets text from ScrollPane and sets title bar to this text
    // Also echos text to standard output (text screen).
    public void actionPerformed(ActionEvent e)
    {
         String s = text.getText();
         System.out.println(s);
         
    }
}