Apéndice B. Ejemplos de Código

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B.1. scribblesimple.py

B.1. scribblesimple.py

    1   #!/usr/bin/env python
    2   
    3   # example scribblesimple.py
    4   
    5	 # GTK - The GIMP Toolkit
    6	 # Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
    7	 # Copyright (C) 2001-2002 John Finlay
    8	 #
    9	 # This library is free software; you can redistribute it and/or
   10	 # modify it under the terms of the GNU Library General Public
   11	 # License as published by the Free Software Foundation; either
   12	 # version 2 of the License, or (at your option) any later version.
   13	 #
   14	 # This library is distributed in the hope that it will be useful,
   15	 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   16	 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   17	 # Library General Public License for more details.
   18	 #
   19	 # You should have received a copy of the GNU Library General Public
   20	 # License along with this library; if not, write to the
   21	 # Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   22	 # Boston, MA 02111-1307, USA.
   23	
   24	
   25	import gtk
   26	
   27	# Backing pixmap for drawing area
   28	pixmap = None
   29	
   30	# Create a new backing pixmap of the appropriate size
   31	def configure_event(widget, event):
   32	    global pixmap
   33	
   34	    x, y, width, height = widget.get_allocation()
   35	    pixmap = gtk.gdk.Pixmap(widget.window, width, height)
   36	    pixmap.draw_rectangle(widget.get_style().white_gc,
   37	                          gtk.TRUE, 0, 0, width, height)
   38	
   39	    return gtk.TRUE
   40	
   41	# Redraw the screen from the backing pixmap
   42	def expose_event(widget, event):
   43	    x , y, width, height = event.area
   44	    widget.window.draw_drawable(widget.get_style().fg_gc[gtk.STATE_NORMAL],
   45	                                pixmap, x, y, x, y, width, height)
   46	    return gtk.FALSE
   47	
   48	# Draw a rectangle on the screen
   49	def draw_brush(widget, x, y):
   50	    rect = (x - 5, y - 5, 10, 10)
   51	    pixmap.draw_rectangle(widget.get_style().black_gc, gtk.TRUE,
   52	                          rect[0], rect[1], rect[2], rect[3])
   53	    widget.queue_draw_area(rect[0], rect[1], rect[2], rect[3])
   54	
   55	def button_press_event(widget, event):
   56	    if event.button == 1 and pixmap != None:
   57	        draw_brush(widget, event.x, event.y)
   58	    return gtk.TRUE
   59	
   60	def motion_notify_event(widget, event):
   61	    if event.is_hint:
   62	        x, y, state = event.window.get_pointer()
   63	    else:
   64	        x = event.x
   65	        y = event.y
   66	        state = event.state
   67	    
   68	    if state & gtk.gdk.BUTTON1_MASK and pixmap != None:
   69	        draw_brush(widget, x, y)
   70	  
   71	    return gtk.TRUE
   72	
   73	def main():
   74	    window = gtk.Window(gtk.WINDOW_TOPLEVEL)
   75	    window.set_name ("Test Input")
   76	
   77	    vbox = gtk.VBox(gtk.FALSE, 0)
   78	    window.add(vbox)
   79	    vbox.show()
   80	
   81	    window.connect("destroy", gtk.mainquit)
   82	
   83	    # Create the drawing area
   84	    drawing_area = gtk.DrawingArea()
   85	    drawing_area.set_size_request(200, 200)
   86	    vbox.pack_start(drawing_area, gtk.TRUE, gtk.TRUE, 0)
   87	
   88	    drawing_area.show()
   89	
   90	    # Signals used to handle backing pixmap
   91	    drawing_area.connect("expose_event", expose_event)
   92	    drawing_area.connect("configure_event", configure_event)
   93	
   94	    # Event signals
   95	    drawing_area.connect("motion_notify_event", motion_notify_event)
   96	    drawing_area.connect("button_press_event", button_press_event)
   97	
   98	    drawing_area.set_events(gtk.gdk.EXPOSURE_MASK
   99	                            | gtk.gdk.LEAVE_NOTIFY_MASK
  100	                            | gtk.gdk.BUTTON_PRESS_MASK
  101	                            | gtk.gdk.POINTER_MOTION_MASK
  102	                            | gtk.gdk.POINTER_MOTION_HINT_MASK)
  103	
  104	    # .. And a quit button
  105	    button = gtk.Button("Quit")
  106	    vbox.pack_start(button, gtk.FALSE, gtk.FALSE, 0)
  107	
  108	    button.connect_object("clicked", lambda w: w.destroy(), window)
  109	    button.show()
  110	
  111	    window.show()
  112	
  113	    gtk.main()
  114	
  115	    return 0
  116	
  117	if __name__ == "__main__":
  118	    main()