package edu.calpoly.cpe205.fetter;
import javax.swing.*;
import java.util.*;
import java.io.*;
import java.lang.reflect.*;
import java.lang.*;
import java.awt.*;
import javax.swing.event.*;
import java.awt.event.*;
/**
 * This class listens for changes in the contents of a JTextArea and makes
 * the tab containing the JTextArea highlight red until it is selected again.
 */

// Author: Phillip Hansen
// Last Updated By:  Jonathon Lee
// Version History:
//   Nov 20, 2000 - comments/pseudocode added
//   Nov 30, 2000 - (Mike Hebron) updated class description, field description
//   Jan 17, 2001 - added ETA.out lines to all methods
//   Feb 27, 2001 - (Phillip Hansen) implemented constructor, changedUpdate(),
//                  insertUpdate(), and run()
//   Mar 08, 2001 - (Phillip Hansen) changed so that it no longer makes tab blink,
//                  just makes it highlight until the user clicks there.

public class ChangeBackgroundDocumentListener implements DocumentListener, MouseListener
{
    /**
     * Creates a new instance of ChangeBackgroundDocumentListener
     * <P>
     * Post-conditions: new instance has been created
     * @param text JTextArea to instantiate text with
     * @param tab JTabbedPane to instantiate tab with
     */
    public ChangeBackgroundDocumentListener(JTextArea text, JTabbedPane tab, int index)
    {
        // SET tabIndex to index
        // SET this.tab to tab
        // CALL getDocument of text
        // CALL addDocumentListener of the returned document with this
        // CALL getBackgroundAt of tab with index
        // SET originalColor to the returned color

        tabIndex = index;
        this.tab = tab;
        text.getDocument().addDocumentListener(this);
        originalColor = this.tab.getBackgroundAt(tabIndex);
    }

    /**
     * method is called when a change occurs
     * <P>
     * Pre-conditions: change has occured<BR>
     * Post-conditions: none
     * @param evt the document event
     */
    public void changedUpdate(DocumentEvent evt)
    {
    }

    /**
     * method is called when an insert occurs
     * <P>
     * Pre-conditions: insert has occurs<BR>
     * Post-conditions: none
     * @param evt the document event
     */
    public void insertUpdate(DocumentEvent evt)
    {
        // CALL getSelectedIndex of tab
        // IF returned index is not equal to tabIndex
        //     CALL setBackgroundAt of tab with tabIndex, Color.red
        // ENDIF
        
        if (tab.getSelectedIndex() != tabIndex)
        {
            tab.setBackgroundAt(tabIndex, Color.red);
            tab.repaint();
        }
    }

    /**
     * method is called when a remove occurs
     * <P>
     * Pre-conditions: remove has occurs<BR>
     * Post-conditions: none
     * @param evt the document event
     */
    public void removeUpdate(DocumentEvent evt)
    {    // NOTHING
    }
    
    public void mouseEntered(MouseEvent evt)
    {    //not needed
    }
    public void mouseExited(MouseEvent evt)
    {    //not needed
    }
    public void mousePressed(MouseEvent evt)
    {    //not needed
    }
    public void mouseReleased(MouseEvent evt)
    {    //not needed
    }

    /**
     * it switches the background color back if it was red
     * <P>
     * Pre-conditions: the MouseListener has been triggered<BR>
     * Post-conditions: none
     * @param evt the MouseEvent
     */
    public void mouseClicked(MouseEvent evt)
    {
        // CALL getSelectedIndex of tab
        // CALL getBackgroundAt of tab with returned index
        // IF returned background color is equal to Color.red
        //     CALL getSelectedIndex of tab
        //     CALL setBackgroundAt of tab with returned index and originalColor
        // ENDIF
        
        if (tab.getBackgroundAt(tab.getSelectedIndex()) == Color.red)
        {
            tab.setBackgroundAt(tab.getSelectedIndex(), originalColor);
            tab.repaint();
        }
    }

    /**
     * The JTabbedPane that holds all of the JTextAreas
     */
    protected JTabbedPane tab;

    /**
     * The original color when switching the tabs back
     */
    protected Color originalColor;

    /**
     * Stores the index of the tab this listener is listening to
     */
    protected int tabIndex;   
}