package e4s.tutorial;

import e4s.html.*;
import e4s.servlet.E4ModuleImplementation;
import e4s.servlet.E4ServletImplementation_Intf;


/**
 * Define a reusable element of HTML tags that covers some specific layout or logic and 
 * add it to other elements within the HTML output context.
 *
 * {@tutorial Example_HtmlElement_Intf}
 */
public class Example_HtmlElement_Intf extends E4ModuleImplementation
{
   public static E4Method start = null;

   /**
    * The element holds a caption and 7x entries, one for each weekday.
    */
   public class MyElement extends E4HtmlContentElement implements E4HtmlElement_Intf
   {
      private boolean m_set[] = new boolean[7];
      private String m_label = null;
      
      /**
       * Construct an element with a specified caption.
       * 
       * @param label the caption to be displayed
       */
      public MyElement( String label )
      {
         m_label = label;
      }
      
      /**
       * Render some content (a table tag with two rows and one holding 7 td tags).
       */
      public void createContent()
      {
         final String WDAYS[] = {"Su","Mo","Tu","We","Th","Fr","Sa"};
         
         TABLE table = TABLE(TABLE.E4S_DEFAULT_TABLE());
      
         TD tdHeader = table.TR().TD();
         tdHeader.setColspan(7);
         tdHeader.setAlign(Align.CENTER);
         tdHeader.print(m_label);
         
         TD td[] = table.TR().TD(7);
      
         for( int i = 0; i < 7; i++ )
         {
            td[i].I().print(WDAYS[i]);
            
            if (m_set[i])
               td[i].setBgColor(E4Color.LIGHT_BLUE);
         }
      }
      
      /**
       * Set one particular day
       * 
       * @param n (0=Sunday .. 6=Saturday)
       */
      public void set( int n )
      {
         m_set[n] = true;
      }
   }
   
   
   /**
    * This is our main function. Make some HTML output but also use the MyElement class in two cases.
    */
   public void start( HTML html )
   {
      MyElement departure = new MyElement("Departure");
      departure.set(0);
      departure.set(2);
      departure.set(5);
      departure.createContent();
      
      MyElement arrival = new MyElement("Arrival");
      arrival.set(1);
      arrival.set(3);
      arrival.set(6);
      arrival.createContent();
      
      BODY body = html.BODY();
      
      body.B().print("Last Train to London..");
      
      TABLE table = html.BODY().TABLE();
      TR tr = table.TR();
      
      tr.TD().addElement(departure);
      tr.TD().addElement(arrival);
   }
   
}