import java.awt.*;
import java.applet.*;
import java.awt.event.*; // Requerido para controles de Interfaz con usuario

/**
 * This class reads PARAM tags from its HTML host page and sets
 * the color and label properties of the applet. Program execution
 * begins with the init() method. 
 */

// Lucio Gayosso 07/15/2000. Este programa muestra los diferentes controles de interfaz disponibles en Java
// mediante el metodo de extension de Clase

public class UICAplt extends Applet
{
	/**
	 * The entry point for the applet. 
	 */
	String m_strDisplay="No 'Button' controls have been pressed.";
	String m_strDisplay2="No events on 'Checkboxes' controls";  // Texto para 'checkboxes'
	String m_strDisplay3="No choice selected on 'Choice' control"; // Texto para controles 'Choice'
	String m_strDisplay4="No items have been selected on 'List' control"; // Texto para el control tipo 'Lista'
	String m_strDisplay5="No event has occured on the 'TextField' control";// Texto para el control tipo 'Texto'
	String m_strDisplay6="No event has occured on the 'TextArea' control";// Texto para el control tipo 'Area de Texto'
		
	MyButton m_Button1=new MyButton("First Button");
	MyButton m_Button2=new MyButton("Second Button");
	MyButton m_Button3=new MyButton("Third Button");
	MyCheckbox m_Checkbox1 = new MyCheckbox("One");
	MyCheckbox m_Checkbox2 = new MyCheckbox("Two");
	MyCheckbox m_Checkbox3 = new MyCheckbox("Three");
	MyCheckbox m_Checkbox4 = new MyCheckbox("Four");
	MyCheckbox m_Checkbox5 = new MyCheckbox("Five");
	MyCheckbox m_Checkbox6 = new MyCheckbox("Six");
	MyChoice m_Choice = new MyChoice();
	MyList m_List = new MyList(5,false);
	MyTextField tf = new MyTextField("This is the TextField control! Type in and see the messages below");
	MyTextArea ta = new MyTextArea("This is the TextArea control! Type in and see the messages below");
										
	public void init()
	{
		//initForm();		// Se necesitan eliminar estas dos lineas para poder 
		//usePageParams();	// desplegar los botones

		// TODO: Add any constructor code after initForm call.
		
		//Utilizacion del control 'Label'
		Label label1, label2, label3, label4; 
		label1 = new Label("                                Java's User Interface Controls.                              ",Label.CENTER);
		label2 = new Label("                                       (by Lucio Gayosso).                                   ",Label.CENTER);
 
		Font font = new Font("Helvetica", Font.BOLD,14);
		label1.setFont(font);
		label2.setFont(font);
		add(label1);
		add(label2);
		//Adicion de los demas controles en el Applet
		add(m_Button1);
		add(m_Button2);
		add(m_Button3);
		add(m_Checkbox1);
		add(m_Checkbox2);
		add(m_Checkbox3);
		add(m_Checkbox4);
		add(m_Checkbox5);
		add(m_Checkbox6);
		m_Choice.addItem("Selection One"); // Agrega el elemento 'One' al control m_Choice
		m_Choice.addItem("Selection Two");
		m_Choice.addItem("Selection Three");
		add(m_Choice);
		m_List.addItem(" List Selection One"); // Agrega el elemento "List Selection One" al control de tipo lista
		m_List.addItem(" List Selection Two");
		m_List.addItem(" List Selection Three");
		add(m_List);
		add(tf);
		add(ta);
		
	}
	
	public void paint(Graphics g)
	{
		g.drawString(m_strDisplay,20,360);
		g.drawString(m_strDisplay2,20,375);
		g.drawString(m_strDisplay3,20,390);
		g.drawString(m_strDisplay4,20,405);
		g.drawString(m_strDisplay5,20,420);
		g.drawString(m_strDisplay6,20,435);
	}
	
	public class MyButton extends Button
	{
		String m_strText;
		
		MyButton(String s)
		{
			super(s);
			enableEvents(AWTEvent.ACTION_EVENT_MASK);
			m_strText=s;
		}
		
		public void processActionEvent(ActionEvent ae)
		{
			m_strDisplay="The '"+m_strText+"' was pressed";
			getParent().repaint();
			super.processActionEvent(ae);
		}
	}
	
	public class MyCheckbox extends Checkbox
	{
		String m_strText2;
		
		MyCheckbox(String s)
		{
			super(s);
			m_strText2=s;
			enableEvents(AWTEvent.ITEM_EVENT_MASK);						 
		}
		
		public void processItemEvent(ItemEvent ie)
		{
			m_strDisplay2="Checkbox '"+m_strText2+"' was just pressed.";
			getParent().repaint();
			super.processItemEvent(ie);			
		}
	}
	
	public class MyChoice extends Choice
	{
		MyChoice()
		{
			super();
			enableEvents(AWTEvent.ITEM_EVENT_MASK);						 
		}
		
		public void processItemEvent(ItemEvent ie)
		{
			m_strDisplay3="Choice '"+getSelectedItem()+"' was selected.";
			getParent().repaint();
		}
	}
			
	public class MyList extends List
	{
		MyList()
		{
			super();
			enableEvents(AWTEvent.ITEM_EVENT_MASK);						 
		}
		
		MyList(int nLines, boolean bMultiselect)
		{
			super(nLines, bMultiselect);
			enableEvents(AWTEvent.ITEM_EVENT_MASK);						 
		}
		
		public void processItemEvent(ItemEvent ie)
		{
			int nStateChange = ie.getStateChange();
			if(nStateChange == ItemEvent.SELECTED)
			{
				m_strDisplay4 = "'"+ getSelectedItem() + "' was selected.";
				getParent().repaint();
			}
						
		}
	}
	
	public class MyTextField extends TextField
	{
		MyTextField(String s)
		{
			super(s);
			enableEvents(AWTEvent.ACTION_EVENT_MASK
						 |AWTEvent.FOCUS_EVENT_MASK
						 |AWTEvent.KEY_EVENT_MASK
						 );
		}
		
		public void processKeyEvent(KeyEvent ke)
		{
			if (ke.getID()==ke.KEY_RELEASED)
			{
				m_strDisplay5="A 'Key Event' ocurred on the 'TextField' control. The key released was " + ke.getKeyChar() + ".";
				getParent().repaint();					
			}
			super.processKeyEvent(ke);
		}
		public void processActionEvent(ActionEvent ae)
		{
			m_strDisplay5="An 'Action Event' ocurred.";
			getParent().repaint();					
			super.processActionEvent(ae);
		}
		public void processFocusEvent(FocusEvent fe)
		{
			if (fe.getID()==fe.FOCUS_GAINED)
			{
				m_strDisplay5="The 'Focus' was gained on the 'TextField' control";
				getParent().repaint();					
			}
			else if(fe.getID()==fe.FOCUS_LOST)
			{
				m_strDisplay5="The 'Focus' was lost on the 'TextField' control";
				getParent().repaint();					
			}
			super.processFocusEvent(fe);
		}
	}						
	public class MyTextArea extends TextArea
	{
		MyTextArea(String s)
		{
			super(s);
			enableEvents(AWTEvent.FOCUS_EVENT_MASK
						 |AWTEvent.KEY_EVENT_MASK
						 );
		}
		
		public void processKeyEvent(KeyEvent ke)
		{
			if (ke.getID()==ke.KEY_RELEASED)
			{
				m_strDisplay6="A 'Key Event' ocurred on the 'TextArea' control. The key released was " + ke.getKeyChar() + ".";
				getParent().repaint();					
			}
			super.processKeyEvent(ke);
		}
		public void processFocusEvent(FocusEvent fe)
		{
			if (fe.getID()==fe.FOCUS_GAINED)
			{
				m_strDisplay6="The 'Focus' was gained on the 'TextArea' control";
				getParent().repaint();					
			}
			else if(fe.getID()==fe.FOCUS_LOST)
			{
				m_strDisplay6="The 'Focus' was lost on the 'TextArea' control";
				getParent().repaint();					
			}
			super.processFocusEvent(fe);
		}
	}						

		
	private	final String labelParam = "label";
	private	final String backgroundParam = "background";
	private	final String foregroundParam = "foreground";

	/**
	 * Reads parameters from the applet's HTML host and sets applet
	 * properties.
	 */
	private void usePageParams()
	{
		final String defaultLabel = "Default label";
		final String defaultBackground = "C0C0C0";
		final String defaultForeground = "000000";
		String labelValue;
		String backgroundValue;
		String foregroundValue;

		/** 
		 * Read the <PARAM NAME="label" VALUE="some string">,
		 * <PARAM NAME="background" VALUE="rrggbb">,
		 * and <PARAM NAME="foreground" VALUE="rrggbb"> tags from
		 * the applet's HTML host.
		 */
		labelValue = getParameter(labelParam);
		backgroundValue = getParameter(backgroundParam);
		foregroundValue = getParameter(foregroundParam);

		if ((labelValue == null) || (backgroundValue == null) ||
			(foregroundValue == null))
		{
			/**
			 * There was something wrong with the HTML host tags.
			 * Generate default values.
			 */
			labelValue = defaultLabel;
			backgroundValue = defaultBackground;
			foregroundValue = defaultForeground;
		}

		/**
		 * Set the applet's string label, background color, and
		 * foreground colors.
		 */
		label1.setText(labelValue);
		label1.setBackground(stringToColor(backgroundValue));
		label1.setForeground(stringToColor(foregroundValue));
		this.setBackground(stringToColor(backgroundValue));
		this.setForeground(stringToColor(foregroundValue));
	}

	/**
	 * Converts a string formatted as "rrggbb" to an awt.Color object
	 */
	private Color stringToColor(String paramValue)
	{
		int red;
		int green;
		int blue;

		red = (Integer.decode("0x" + paramValue.substring(0,2))).intValue();
		green = (Integer.decode("0x" + paramValue.substring(2,4))).intValue();
		blue = (Integer.decode("0x" + paramValue.substring(4,6))).intValue();

		return new Color(red,green,blue);
	}

	/**
	 * External interface used by design tools to show properties of an applet.
	 */
	public String[][] getParameterInfo()
	{
		String[][] info =
		{
			{ labelParam, "String", "Label string to be displayed" },
			{ backgroundParam, "String", "Background color, format \"rrggbb\"" },
			{ foregroundParam, "String", "Foreground color, format \"rrggbb\"" },
		};
		return info;
	}

	Label label1 = new Label();

	/**
	 * Intializes values for the applet and its components
	 */
	void initForm()
	{
		this.setBackground(Color.lightGray);
		this.setForeground(Color.black);
		label1.setText("label1");
		this.setLayout(new BorderLayout());
		this.add("North",label1);
	}
}