package example7_1;

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRootPane;
import javax.swing.JTextField;

// This app demonstrates the Composite pattern used in Swing components
public class SwingCompositesDemoApp extends JFrame {
	private JTextField msgField;

	public static void main(String[] args) {
		SwingCompositesDemoApp app = new SwingCompositesDemoApp();
		app.initUI();
	}

	// create the JFrame and UI components
	private void initUI() {
		ButtonHandler bh = new ButtonHandler();

		setSize(500, 500);

		// Get the content pane - the container that holds other UI elements		
		//		JRootPane jrp = this.getRootPane();
		//		Container contentPane = jrp.getContentPane(); 
		Container contentPane = this.getContentPane(); // the common shortcut
		contentPane.setBackground(Color.black);
		contentPane.setLayout(new FlowLayout(FlowLayout.CENTER) );
		
		// Create a text field for messages
		msgField = new JTextField("messages go here");
		msgField.setPreferredSize(new Dimension(300, 25));
		contentPane.add(msgField);

		{// Create a JPanel inside the content pane
			JPanel outerPanel = new JPanel();
			outerPanel.setPreferredSize(new Dimension(400, 400));	
			contentPane.add(outerPanel);
			outerPanel.setLayout(new FlowLayout(FlowLayout.LEFT) );
			outerPanel.setBackground(Color.green);

			{// Create an upper JPanel inside the outer JPanel (a composite containing a composite)
				JPanel innerPanelUpper = new JPanel();
				innerPanelUpper.setPreferredSize(new Dimension(300, 100));	
				outerPanel.add(innerPanelUpper);
				innerPanelUpper.setLayout(new FlowLayout(FlowLayout.LEFT) );
				innerPanelUpper.setBackground(Color.blue);

				{ // Put a JButton inside the upper JPanel
					JButton upperButton = new JButton("upper");
					upperButton.setPreferredSize(new Dimension(250, 35));	
					upperButton.setActionCommand("upper");
					innerPanelUpper.add(upperButton);
					upperButton.addActionListener( bh ); // "attach" to observer
				}
			}

			{// Create an lower JPanel inside the outer JPanel
				JPanel innerPanelLower = new JPanel();
				innerPanelLower.setPreferredSize(new Dimension(300, 100));	
				outerPanel.add(innerPanelLower);
				innerPanelLower.setLayout(new FlowLayout(FlowLayout.LEFT) );
				innerPanelLower.setBackground(Color.yellow);

				{// Put a JButton inside the lower JPanel
					JButton lowerButton = new JButton("lower");
					lowerButton.setPreferredSize(new Dimension(250, 35));	
					lowerButton.setActionCommand("lower");
					lowerButton.addActionListener( bh ); // "attach" to observer
					lowerButton.setLayout(new FlowLayout(FlowLayout.LEFT) );
                    innerPanelLower.add(lowerButton);

                    JButton lower2 = new JButton("hey");
                    lower2.addActionListener(new ActionListener() {
                        @Override
                        public void actionPerformed(ActionEvent e) {
                            msgField.setText("Hey!");
                        }
                    });
                    lowerButton.add(lower2);
                    // does a button include components?
                    // The "paint" method is probably the place to look.
//                    lowerButton.paint(new Graphics());
				}
			}
		}
		pack();
		setVisible(true);
	}

	// handler for button presses;
	private class ButtonHandler implements ActionListener {
		@Override
		public void actionPerformed(ActionEvent event) {
			String cmd = event.getActionCommand();
			// display the name of the button that was pressed
			msgField.setText(String.format( cmd + " was pressed."));
		}
	}
}