#  MovingBallMaemo.py  (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-08-10  File created.
#  2006-10-02  Last modification.

#  This program works on Maemo 2.0 (OS2006) and later versions.

import gtk
import hildon

class MovingBallApplication( hildon.Program ) :

   def __init__( self ) :

      hildon.Program.__init__( self )

      self.application_window = hildon.Window()
      self.application_window.set_title( "Move the Ball with Buttons" )
      self.application_window.connect("destroy", lambda w: gtk.main_quit() )

      self.application_window.set_size_request( 720, 420 )
      self.drawing_area = gtk.DrawingArea()
      self.drawing_area.set_size_request( 720, 350 )

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

      left_button  =  gtk.Button( " < " )
      up_button    =  gtk.Button( " Up " )
      down_button  =  gtk.Button( " Down " )
      right_button =  gtk.Button( " > " )

      left_button.connect( "clicked", self.left_button_clicked )
      up_button.connect( "clicked", self.up_button_clicked )
      down_button.connect( "clicked", self.down_button_clicked )
      right_button.connect( "clicked", self.right_button_clicked )

      operations_panel  =  gtk.HBox( False, 0 )

      operations_panel.pack_start( left_button )
      operations_panel.pack_start( up_button )
      operations_panel.pack_start( down_button )
      operations_panel.pack_start( right_button )

      color_selection_menu = gtk.combo_box_entry_new_text()

      color_selection_menu.append_text( "red" )
      color_selection_menu.append_text( "orange" )
      color_selection_menu.append_text( "yellow" )
      color_selection_menu.append_text( "green" )
      color_selection_menu.append_text( "blue" )
      color_selection_menu.append_text( "magenta" )
      color_selection_menu.append_text( "cyan" )
      color_selection_menu.append_text( "pink" )
      color_selection_menu.append_text( "lightGray" )

      operations_panel.pack_start( color_selection_menu )

      color_selection_menu.set_active( 0 )
      color_selection_menu.child.connect( "changed",
                                          self.color_selection_menu_used )

      main_vertical_box  =  gtk.VBox( False, 0 )

      main_vertical_box.pack_start( self.drawing_area, False, False, 3 ) 
      main_vertical_box.pack_start( operations_panel, False, False, 3 )

      self.application_window.add( main_vertical_box )

      self.current_ball_color  =  "red"

      window_width, window_height  =  self.application_window.get_size()

      self.ball_position_x  =  window_width / 2 - 40 ;
      self.ball_position_y  =  window_height / 2 - 40 ;

      self.drawing_area.show()

      operations_panel.show()

      left_button.show()
      up_button.show()
      down_button.show()
      right_button.show()

      color_selection_menu.show()

      main_vertical_box.show()
      self.application_window.show()

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

      self.ball_position_x  =  self.ball_position_x - 3
      self.drawing_area.queue_draw()

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

      self.ball_position_y  =  self.ball_position_y - 3
      self.drawing_area.queue_draw()

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

      self.ball_position_y  =  self.ball_position_y + 3
      self.drawing_area.queue_draw()

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

      self.ball_position_x  =  self.ball_position_x + 3
      self.drawing_area.queue_draw()

   def color_selection_menu_used( self, menu_selection ) :

      self.current_ball_color  =  menu_selection.get_text()
      self.drawing_area.queue_draw()

   def drawing_area_exposed( self, area, event ) :

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

      this_drawable  =  self.drawing_area.window

      graphics_context.foreground  =  \
            this_drawable.get_colormap().alloc_color( self.current_ball_color )

      #  Note that angles are expressed in 1/64ths of a degree.
      #  360 degrees is thus represented by value 360*64

      this_drawable.draw_arc( graphics_context, True,
                              self.ball_position_x, self.ball_position_y,
                              80, 80,  0, 360*64 )

      graphics_context.foreground  =  \
                  this_drawable.get_colormap().alloc_color( "black" )


      this_drawable.draw_arc( graphics_context, False,
                              self.ball_position_x, self.ball_position_y,
                              80, 80,  0, 360*64 )

      text_to_show  =  self.drawing_area.create_pango_layout( "" )

      text_to_show.set_text( "(%d, %d)"  %  \
                             ( self.ball_position_x, self.ball_position_y ) )

      this_drawable.draw_layout( graphics_context, 20, 20, text_to_show )

      return True

   def run( self ) :
      gtk.main()

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