#  KeyboardInputDemoGTK.py  (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-08-31  File created.
#  2009-02-11  Last modification.


import gtk
 
class KeyboardInputDemoApplication :

   def __init__( self ) :

      self.application_window = gtk.Window( gtk.WINDOW_TOPLEVEL )
      self.application_window.set_title( "PRESS THE KEYS OF YOUR KEYBOARD" )
      self.application_window.connect( "destroy", self.exit_this_application )

      self.application_window.set_size_request( 600, 400 )
      self.drawing_area = gtk.DrawingArea()

      self.application_window.add( self.drawing_area )

      self.drawing_area.connect( "expose-event", self.handle_expose_event )

      self.drawing_area.connect( "key_press_event", self.key_pressed )

      self.drawing_area.connect( "key_release_event", self.key_released )

      self.drawing_area.set_events( gtk.gdk.EXPOSURE_MASK
                                  | gtk.gdk.KEY_PRESS_MASK
                                  | gtk.gdk.KEY_RELEASE_MASK )

      self.drawing_area.set_flags( gtk.HAS_FOCUS | gtk.CAN_FOCUS )
      self.drawing_area.grab_focus()

      self.drawing_area.show()
      self.application_window.show()

      self.code_of_last_pressed_key  =  63  #  The question mark ?

   def key_pressed( self, widget, event ) :

      self.code_of_last_pressed_key  =  event.keyval

      print  "key press event,  CHARACTER: ",

      print unichr( self.code_of_last_pressed_key )

      self.drawing_area.queue_draw()

   def key_released( self, widget, event ) :

      print  "key release event"


   def handle_expose_event( self, area, event ) :

      graphics_context  =   \
            self.drawing_area.get_style().fg_gc[gtk.STATE_NORMAL]

      this_drawable  =  self.drawing_area.window


      text_to_show  =  self.drawing_area.create_pango_layout( "" )

      #  The format specifier %c treats an integer value as a character,
      #  but the integer value must be less than 256.
      #  %s converts an object to a string.
      #  %X shows an integer in hexadecimal form.

      if  self.code_of_last_pressed_key  <  256  :

         text_to_show_as_string  =  "Last pressed key: %c %X %d"  %  \
                                    ( self.code_of_last_pressed_key,
                                      self.code_of_last_pressed_key,
                                      self.code_of_last_pressed_key )
      else :

         text_to_show_as_string  =  "Last pressed key: %s %X %d"  %  \
                                    ( self.code_of_last_pressed_key,
                                      self.code_of_last_pressed_key,
                                      self.code_of_last_pressed_key )
                                            
      #  Let's now convert the string first to a Unicode string and
      #  then to a UTF-8 string. The set_text() method accepts only
      #  a UTF-8 string as its argument.

      text_to_show_as_utf8_string  = \
                unicode( text_to_show_as_string, "latin-1" ).encode( "utf8" )

      text_to_show.set_text( text_to_show_as_utf8_string )

      this_drawable.draw_layout( graphics_context, 100, 200, text_to_show )

      if  self.code_of_last_pressed_key  ==  gtk.keysyms.F1  :

         text_to_show.set_text( "You pressed the F1 key" )
         this_drawable.draw_layout( graphics_context, 100, 250, text_to_show )

      elif  self.code_of_last_pressed_key  ==  gtk.keysyms.Up  :

         text_to_show.set_text( "You pressed the Arrow Up key" )
         this_drawable.draw_layout( graphics_context, 100, 250, text_to_show )

      elif  self.code_of_last_pressed_key  ==  gtk.keysyms.Down  :

         text_to_show.set_text( "You pressed the Arrow Down key" )
         this_drawable.draw_layout( graphics_context, 100, 250, text_to_show )

      return True

   def run( self ) :

      gtk.main()

   def exit_this_application( self, widget, data=None ) :

      gtk.main_quit()

if __name__ == "__main__":
   this_application  =  KeyboardInputDemoApplication()
   this_application.run()


#  The development of this program has been sponsored by Nokia Multimedia.

#  This program works in the same way as KeyboardInputDemoApplet.java.