package test;

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingUtilities;
import javax.swing.border.EtchedBorder;

/**
 * a simple class that uses box layouts to make a resizable JFrame with some components
 * @author MarkW
 *
 */
public class GuiTest extends JFrame {

	public static void main(String[] args) {

		//using an annoynmous class here of type runnable
		SwingUtilities.invokeLater(new Runnable() {

			@Override
			public void run() {
				GuiTest gt = new GuiTest();
				gt.setVisible(true);
			}

		});
	}

	//our graphical components
	private JPanel mainPanel;
	private JTextArea textArea;
	private JTextField textField;
	private JButton okButton;
	private JButton clearButton;
	private JButton exitButton;

	//our button listener
	private ButtonListener buttonListener;

	//some dimensions
	private final Dimension TEXTAREASIZE = new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);
	private final Dimension TEXTFIELDSIZE = new Dimension(100, 20);
	private final Dimension BUTTONSIZE = new Dimension(75,35);

	/**
	 * GuiTest constructor
	 */
	public GuiTest() {
		//set some basic stuff
		this.setBounds(100, 100, 600, 450);
		this.setMinimumSize(new Dimension(550, 400));
		//close the app when the form is closed
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
		this.setTitle("Guit Examples");
		//this is where we will set up our components
		init();
	}

	public void init() {
		//build our main panel which will be our content pane
		mainPanel = new JPanel();
		//this is a box layout with a Y axis... adds components top down
		mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
		//this looks complicated,
		//but its just making an empty outer border thats 10 pixels on the top bottom left and right
		//and making a lowered etched border with a break in it for text as the inner border
		mainPanel.setBorder(BorderFactory.createCompoundBorder(
				BorderFactory.createEmptyBorder(10, 10, 10, 10),
				BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(EtchedBorder.LOWERED), "Box Layouts!")));

		//I like to use a quick and dirty local JPanel to help arrange stuff
		JPanel tPanel;

		//add our text area first
		textArea = new JTextArea();
		//give our text area a scroll bar
		JScrollPane scrollPane = new JScrollPane(textArea);
		scrollPane.setMaximumSize(TEXTAREASIZE);
		scrollPane.setBorder(BorderFactory.createCompoundBorder(
				BorderFactory.createEmptyBorder(5, 5, 5, 5),
				BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(EtchedBorder.LOWERED), "Output Window")));
		scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		mainPanel.add(scrollPane);
		//this is an invisible component that grows to fill space vertically
		//its below the textArea scroll pane
		mainPanel.add(Box.createVerticalGlue());


		//do the text field stuff
		textField = new JTextField();
		textField.setMinimumSize(TEXTFIELDSIZE);
		textField.setMaximumSize(TEXTFIELDSIZE);
		textField.setPreferredSize(TEXTFIELDSIZE);

		//time to use our temp panel
		tPanel = new JPanel();
		//x axis this time for left to right
		tPanel.setLayout(new BoxLayout(tPanel, BoxLayout.X_AXIS));
		//add a fixed width invisible component on the left
		tPanel.add(Box.createHorizontalStrut(15));
		//create a label for the text field
		tPanel.add(new JLabel("Enter Text:"));
		//add a small spacer
		tPanel.add(Box.createHorizontalStrut(3));
		//add the text field
		tPanel.add(textField);

		//make our button listener now so we have it
		buttonListener = new ButtonListener();

		//lets push the next items to the far right side of the form
		tPanel.add(Box.createHorizontalGlue());
		//add the buttons
		okButton = new JButton("Ok");
		okButton.addActionListener(buttonListener);
		okButton.setMinimumSize(BUTTONSIZE);
		okButton.setMaximumSize(BUTTONSIZE);
		okButton.setPreferredSize(BUTTONSIZE);
		tPanel.add(okButton);
		//a small spacer
		tPanel.add(Box.createHorizontalStrut(5));
		clearButton = new JButton("Clear");
		clearButton.addActionListener(buttonListener);
		clearButton.setMinimumSize(BUTTONSIZE);
		clearButton.setMaximumSize(BUTTONSIZE);
		clearButton.setPreferredSize(BUTTONSIZE);
		tPanel.add(clearButton);
		//a small spacer
		tPanel.add(Box.createHorizontalStrut(5));
		exitButton = new JButton("Exit");
		exitButton.addActionListener(buttonListener);
		exitButton.setMinimumSize(BUTTONSIZE);
		exitButton.setMaximumSize(BUTTONSIZE);
		exitButton.setPreferredSize(BUTTONSIZE);
		tPanel.add(exitButton);
		//lets put some space between the buttons and the right edge
		tPanel.add(Box.createHorizontalStrut(15));


		//add the temp panel to the main panel below the text area
		mainPanel.add(tPanel);

		//this is where the main panel gets
		//added to the JFrames content pane
		this.getContentPane().add(mainPanel);
	}

	/**
	 * this class will listen for click events on the buttons
	 * and do what should be done from there
	 *
	 * @author MarkW
	 *
	 */
	public class ButtonListener implements ActionListener {

		@Override
		public void actionPerformed(ActionEvent e) {

			if (e.getSource() == okButton) {
				SwingUtilities.invokeLater(new Runnable() {
					@Override
					public void run() {
						textArea.append(textField.getText() + "\r\n");
						textArea.setCaretPosition(textArea.getText().length());
						textField.setText("");
					}
				});
			}
			else if (e.getSource() == clearButton) {
				SwingUtilities.invokeLater(new Runnable() {

					@Override
					public void run() {
						textArea.setText("");
					}

				});
			}
			else if (e.getSource() == exitButton) {

				setVisible(false);
				dispose();
			}
		}

	}
}