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"""Implements bridge connection between Sugar/GTK and PyGame"""
import os
import sys
import logging
log = logging.getLogger( 'olpcgames.canvas' )
#log.setLevel( logging.DEBUG )
import threading
from pprint import pprint
import pygtk
pygtk.require('2.0')
import gtk
import gobject
import pygame
from olpcgames import gtkEvent, util
__all__ = ['PyGameCanvas']
class PyGameCanvas(gtk.Layout):
"""Canvas providing bridge methods to run PyGame in GTK
The PyGameCanvas creates a secondary thread in which the Pygame instance will
live, providing synthetic PyGame events to that thread via a Queue. The GUI
connection is done by having the PyGame canvas use a GTK Port object as it's
window pointer, it draws to that X-level window in order to produce output.
"""
def __init__(self, width, height):
"""Initializes the Canvas Object
width,height -- passed to the inner EventBox in order to request a given size,
the Socket is the only child of this EventBox, and the PyGame commands
will be writing to the Window ID of the socket. The internal EventBox is
centered via an Alignment instance within the PyGameCanvas instance.
XXX Should refactor so that the internal setup can be controlled by the
sub-class, e.g. to get size from the host window, or something similar.
"""
# Build the main widget
super(PyGameCanvas,self).__init__()
self.set_flags(gtk.CAN_FOCUS)
# Build the sub-widgets
self._align = gtk.Alignment(0.5, 0.5)
self._inner_evb = gtk.EventBox()
self._socket = gtk.Socket()
# Add internal widgets
self._inner_evb.set_size_request(width, height)
self._inner_evb.add(self._socket)
self._socket.show()
self._align.add(self._inner_evb)
self._inner_evb.show()
self._align.show()
self.put(self._align, 0,0)
# Construct a gtkEvent.Translator
self._translator = gtkEvent.Translator(self, self._inner_evb)
# <Cue Thus Spract Zarathustra>
self.show()
def connect_game(self, app):
"""Imports the given main-loop and starts processing in secondary thread
app -- fully-qualified Python path-name for the game's main-loop, with
name within module as :functionname, if no : character is present then
:main will be assumed.
Side effects:
Sets the SDL_WINDOWID variable to our socket's window ID
Calls PyGame init
Causes the gtkEvent.Translator to "hook" PyGame
Creates and starts secondary thread for Game/PyGame event processing.
"""
# Setup the embedding
os.environ['SDL_WINDOWID'] = str(self._socket.get_id())
#print 'Socket ID=%s'%os.environ['SDL_WINDOWID']
pygame.init()
self._translator.hook_pygame()
# Load the modules
# NOTE: This is delayed because pygame.init() must come after the embedding is up
if ':' not in app:
app += ':main'
mod_name, fn_name = app.split(':')
mod = __import__(mod_name, globals(), locals(), [])
fn = getattr(mod, fn_name)
# Start Pygame
self.__thread = threading.Thread(target=self._start, args=[fn])
self.__thread.start()
def _start(self, fn):
"""The method that actually runs in the background thread"""
import olpcgames
olpcgames.widget = olpcgames.WIDGET = self
try:
import sugar.activity.activity,os
except ImportError, err:
log.info( """Running outside Sugar""" )
else:
try:
os.chdir(sugar.activity.activity.get_bundle_path())
except KeyError, err:
pass
try:
try:
log.info( '''Running mainloop: %s''', fn )
fn()
except Exception, err:
log.error(
"""Uncaught top-level exception: %s""",
util.get_traceback( err ),
)
raise
finally:
gtk.main_quit()
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