1 files changed, 111 insertions, 0 deletions
diff --git a/olpcgames/canvas.py b/olpcgames/canvas.py
new file mode 100755
index 0000000..eda64a2
--- /dev/null
+++ b/olpcgames/canvas.py
@@ -0,0 +1,111 @@
+"""Implements bridge connection between Sugar/GTK and PyGame"""
+import os
+import sys
+import threading
+from pprint import pprint
+
+import pygtk
+pygtk.require('2.0')
+import gtk
+import gobject
+import pygame
+
+from olpcgames import gtkEvent, video
+
+__all__ = ['PyGameCanvas']
+
+class PyGameCanvas(gtk.EventBox):
+    """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.add(self._align)
+        
+        # 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 = self
+        try:
+            import sugar.activity.activity,os
+        except ImportError, err:
+            log.info( """Running outside Sugar""" )
+        else:
+            os.chdir(sugar.activity.activity.get_bundle_path())
+        
+        try:
+            fn()
+        finally:
+            gtk.main_quit()
+