/*
   KeyboardInputDemoFX.java Copyright (c) Kari Laitinen

   http://www.naturalprogramming.com/

   2014-12-29 File created.
   2014-12-29 Last modification.


   This program shows how a Java FX program can find out which keys
   are pressed on the keyboard.

*/


import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.scene.text.* ; 
import javafx.scene.input.* ; // KeyEvent, KeyCode


public class KeyboardInputDemoFX extends Application
{
   Font large_font = Font.font( "SansSerif", FontWeight.BOLD, 24 ) ;

   KeyCode code_of_last_pressed_key  =  KeyCode.EXCLAMATION_MARK ;

   Group group_for_texts = new Group() ;

   Text main_text_line  = new Text( 100, 200, "Last pressed key:  ?" ) ;
   Text additional_text = new Text( 100, 250, "" ) ;

   private void set_text_lines()
   {
      main_text_line.setText( "Last pressed key:  "
                            +  code_of_last_pressed_key.getName() ) ;

      //  The KeyCode enum provides predefined constants (e.g. F1)
      //  which can be used to refer to the individual keys on the keyboard.

      if ( code_of_last_pressed_key == KeyCode.F1 )
      {
         additional_text.setText( "You pressed the F1 key" ) ;
      }
      else if ( code_of_last_pressed_key  ==  KeyCode.UP )
      {
         additional_text.setText( "You pressed the Arrow Up key" ) ;
      }
      else if ( code_of_last_pressed_key  ==  KeyCode.DOWN )
      {
         additional_text.setText( "You pressed the Arrow Down key" ) ;
      }
      else
      {
         additional_text.setText( "" ) ;
      }

   }

   public void start( Stage stage )
   {
      stage.setTitle( "KeyboardInputDemoFX.java" ) ;

      Scene scene = new Scene( group_for_texts, 960, 720 ) ;

      scene.setFill( Color.SEASHELL ) ; // Light reddish color.

      main_text_line.setFont( large_font ) ;
      additional_text.setFont( large_font ) ;

      group_for_texts.getChildren().addAll( main_text_line, additional_text ) ;

      scene.setOnKeyPressed( ( KeyEvent event ) ->
      {
         code_of_last_pressed_key = event.getCode() ;
         set_text_lines() ;

         System.out.print( "\n KeyPressed.  Key code  =  "
                         +  code_of_last_pressed_key ) ;
      } ) ;

      scene.setOnKeyReleased( ( KeyEvent event ) ->
      {
         System.out.print( "\n KeyReleased." ) ;
      } ) ;
   
      scene.setOnKeyTyped( ( KeyEvent event ) ->
      {
         // KeyTyped event occurs when a visible character is typed.
         // The Space character is considered visible. The pressing of the
         // Shift key does not produce a KeyTyped event.

         System.out.print( "\n KeyTyped.   Character  =  " 
                        +  event.getCharacter() ) ;
      } ) ;


      stage.setScene( scene ) ;
      stage.show() ;

   }

   public static void main( String[] command_line_parameters )
   {
      launch( command_line_parameters ) ;
   }
}


/*  NOTES:


The following were useful pages when this program was developed:

https://docs.oracle.com/javase/8/javafx/api/javafx/scene/text/Text.html

https://docs.oracle.com/javase/8/javafx/api/javafx/scene/text/Font.html

https://docs.oracle.com/javase/8/javafx/api/javafx/scene/input/KeyCode.html

https://docs.oracle.com/javase/8/javafx/api/javafx/scene/input/KeyEvent.html

*/