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

/* 0. TRY to use a UserInterface Manager
 * 1. DECLARE a frame, then a panel, then components
 *       a. components are buttons, textfield, labels, menus, etc.
 * 2. CONSTRUCT a frame, then a panel, then components
 *       a. create the components by adding pictures (Icons) if desired
 *       b. have buttons and textfields "listen" for actions
 * 3. CONSTRUCT a layout then ADD to panel
 * 4. ADD components to panel
 * 5. ADD panel to frame
 * 6. Set the Frame to be visible
 */

public class SwingTemplate extends JFrame implements ActionListener
{
	// frame which is the window with borders, title bar, min/max/exit buttons
	private static JFrame f;

	// panel that will hold the contents (i.e. all the components)
	private JPanel        p;

	/*****************************  These are all components */
	// buttons
	private JButton       fancyButton;

	// text field
	private JTextField    text1;

	// labels
	private JLabel        fancyLabel;

	private JMenuBar      menuBar;
	private JMenuItem     item1, item2;
	/*****************************  Ending the components */

	/** this is where we all start
	*/
	public static void main(String arg[])
	{
		// this will allow us to try to use the user interface manager
		// to change the look and feel of the windows
		try
		{
			UIManager.setLookAndFeel(
		                UIManager.getCrossPlatformLookAndFeelClassName());

		    //other possible user interface managers...try some of these instead ...
		    //UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
		    //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
		}
		catch (Exception e)
		{
			// do nothing if a problem...just quit
		}

        // this will really do all the work!
        // it declares and creates a new application
        SwingTemplate app = new SwingTemplate();

		// needed at bottom to of main() to be able to close the application
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		//f.setSize(250,350);  // use this to set the size of the window
		f.pack();		// automatically resize window (use instead of setSize)
     	f.setVisible(true);
	} // main()



	/** constructor that creates or instatiates the frame, panel, layout, etc.
	*/
	public SwingTemplate()
	{
		// Create the overall window for the application
		f = new JFrame("Swing Template");

		// create the content panel to be put in the frame
		p = new JPanel();

		// set the layout to use default FlowLayout which fills the screen
		// from left to right.
		//FlowLayout layout = new FlowLayout();

		// set the layout which will be in a grid measuring 3 rows x 2 columns
		GridLayout layout = new GridLayout(3,2);

		// set the layout to use Borders.  When "add"ing compents to the
		// content or pane, we must specify
		// BorderLayout.NORTH, BorderLayout.SOUTH, ...EAST, WEST, and CENTER
		// example:  p.add(fancyButton, BorderLayout.EAST);
		// BorderLayout layout = new BorderLayout(5,5);

		// set whichever layout is chosen above
		p.setLayout( layout);

		// call the following methods so that they will
		// create & add each of the labels, buttons, & textfields
		// to the content panel
		addLabelsToContentPanel();
		addButtonsToContentPanel();
		addFieldToContentPanel();
		addMenuToFrame();

		// finally add the content to the window
		f.setContentPane(p);
	}


	/** create and add for the labels to the content panel
	*/
	public void addLabelsToContentPanel()
	{

		// get an icon (a small picture) for the second label
		// make sure it is in the same folder as this program
		// add the icon to the label and put the picture to the left
		// of the text, then add the label to the container
		Icon myPicture = new ImageIcon("butterfly.gif");
		fancyLabel = new JLabel("Fancy Label", myPicture, SwingConstants.LEFT);
		fancyLabel.setToolTipText("tooltip for fancy label");
		p.add(fancyLabel);
	}


	/** create,add, and attach events for the text fields to the content panel
	*/
	public void addFieldToContentPanel()
	{
		text1 = new JTextField(10);		// create the textfield & set size to 10
		text1.setEditable(true);			// the user can change it
		p.add(text1);					// add it to the content

		text1.addActionListener(this);	// listen for an mouse click
	}


	/** create, add, and attach events for the buttons
	*  to the content panel
	*/
	public void addButtonsToContentPanel()
	{

		// create a fancy button with pictures and a rollover
		Icon frog    = new ImageIcon("frog.gif");
		Icon buffalo = new ImageIcon("buffalo.gif");
		fancyButton  = new JButton("Fancy Button", frog);
		fancyButton.setRolloverIcon(buffalo);

		// add the button to the content pane then listen for clicks
		p.add(fancyButton);
		fancyButton.addActionListener(this);
	}


	/** this will add menu items and a menu to the menuBar then add
	*   to the frame (not the panel)
	*/
	public void addMenuToFrame()
	{
		menuBar = new JMenuBar();

		JMenu menu = new JMenu("first menu");

		// create first menu item then listen for clicks and add to menu
		item1 = new JMenuItem("remove textfield");
		item1.addActionListener(this);
		menu.add(item1);

		// do the same for 2nd menu item
		item2 = new JMenuItem("Quit");
		item2.addActionListener(this);
		menu.add(item2);

		//add menu to the menuBar
		menuBar.add(menu);

		//finally add to frame
		f.setJMenuBar(menuBar);
	}



	/** handle the actions were taken in the application window
	*/
	public void actionPerformed(ActionEvent e)
	{
		// if button was pressed change the text field
		if (e.getSource() == fancyButton)
		{
			// swap the text from fancy to plain and back again
			if (text1.getText().("fancy"))
			{
				text1.setText("plain");
			}
			else
			{
				text1.setText("fancy");
			}
		}

		// if the textfield was typed in then change the label
		if (e.getSource() == text1)
		{
			fancyLabel.setText(text1.getText());
		}

		if (e.getSource() == item1)
		{
			// note:  wont remove from screen until resize/update called
			p.remove(text1);
		}

		if (e.getSource() == item2)
		{
			System.exit(0);
		}

		repaint();
	}

} // SwingTemplate