//  CustomItemDemoMIDlet.java  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com/

//  2008-09-22  This file was created.
//  2009-10-04  Last modification.

//  This program demonstrates the following things:
//     -  CustomItem class: A CustomItem-based object is an Item which can
//        be attached to a Form, and which has a paint() method
//        with which it is possible use the Graphics method to produce
//        the content for the Item.
//  

import javax.microedition.midlet.* ;
import javax.microedition.lcdui.* ;

class PaintableArea extends CustomItem
{
   static final int DRAWING_AREA_WIDTH  = 180 ;
   static final int DRAWING_AREA_HEIGHT = 140 ;

   CustomItemDemoMIDlet master_midlet ;

   public PaintableArea( CustomItemDemoMIDlet given_midlet )
   {
      super( "PAINTABLE AREA" ) ;

      master_midlet = given_midlet ;
   }

   protected int getMinContentWidth()
   {
      return DRAWING_AREA_WIDTH ;
   }

   protected int getMinContentHeight()
   {
      return DRAWING_AREA_HEIGHT ;
   }

   protected int getPrefContentWidth( int tentative_content_height )
   {
      return DRAWING_AREA_WIDTH ;
   }

   protected int getPrefContentHeight( int tentative_content_width )
   {
      return DRAWING_AREA_HEIGHT ;
   }

   public void request_repaint()
   {
      repaint() ;
   }


   protected void paint( Graphics graphics,
                         int current_item_width,
                         int current_item_height )
   {
      graphics.setColor( 255, 255, 0 ) ;  //  Yellow color
      graphics.fillRect( 0, 0, current_item_width, current_item_height ) ;

      graphics.setColor( 255, 0, 0 ) ;  //  Red color


      if ( master_midlet.ball_drawing_is_selected() == true )
      {
         int ball_diameter = current_item_height / 2 ;

         graphics.fillArc( current_item_width / 2 - ball_diameter / 2,
                           current_item_height / 2 - ball_diameter / 2,
                           ball_diameter, ball_diameter,
                           0, 360 ) ;
      }
      else if ( master_midlet.triangle_drawing_is_selected() == true )
      {
         int triangle_height = current_item_height / 2 ;
         int triangle_width  = triangle_height * 3 / 2 ;

         int triangle_top_point_x  =  current_item_width / 2 ;
         int triangle_top_point_y  =  current_item_height / 4 ;

         graphics.fillTriangle( triangle_top_point_x,
                                triangle_top_point_y,
                                triangle_top_point_x  -  triangle_width / 2,
                                triangle_top_point_y  +  triangle_height,
                                triangle_top_point_x  +  triangle_width / 2,
                                triangle_top_point_y  +  triangle_height ) ;
      }
      else if ( master_midlet.square_drawing_is_selected() == true )
      {
         int square_height = current_item_height / 2 ;

         graphics.fillRect( current_item_width / 2 - square_height / 2,
                            current_item_height / 2 - square_height / 2,
                            square_height, square_height ) ;
      }
   }
}


public class CustomItemDemoMIDlet extends MIDlet
                                  implements ItemStateListener
{
   Display  midlet_display  =  Display.getDisplay( this ) ;
   PaintableArea  paintable_area  = new PaintableArea( this ) ;

   Form  form_for_items  =  new  Form( "CustomItem DEMO" ) ;

   String[]  selectable_shapes  =  { "Ball", "Triangle", "Square" } ;

   ChoiceGroup  shape_choices  =  new  ChoiceGroup(
                                       "Select shape to draw:",
                                       Choice.EXCLUSIVE,
                                       selectable_shapes, null ) ;

   public CustomItemDemoMIDlet()
   {
      form_for_items.append( paintable_area ) ;
      form_for_items.append( shape_choices ) ;

      form_for_items.setItemStateListener( this ) ;
   }

   protected void startApp() throws MIDletStateChangeException
   {
      midlet_display.setCurrent( form_for_items ) ;
   }

   protected void pauseApp()
   {
   }

   protected void destroyApp( boolean unconditional_destruction_requested )
   {
   }

   public boolean ball_drawing_is_selected()
   {
      return ( shape_choices.getSelectedIndex() == 0 ) ;
   }

   public boolean triangle_drawing_is_selected()
   {
      return ( shape_choices.getSelectedIndex() == 1 ) ;
   }

   public boolean square_drawing_is_selected()
   {
      return ( shape_choices.getSelectedIndex() == 2 ) ;
   }


   public void itemStateChanged( Item item_which_changed_state )
   {
      if ( item_which_changed_state == shape_choices )
      {
         paintable_area.request_repaint() ;
      }
   }
}