From 392a0c5a4d19da8f06b3ccab8b9d7fdcd558e64d Mon Sep 17 00:00:00 2001
From: Brian Jordan <brian@laptop.org>
Date: Fri, 27 Jun 2008 18:17:45 +0000
Subject: Initial commit

---
(limited to 'olpcgames/_gtkmain.py')

diff --git a/olpcgames/_gtkmain.py b/olpcgames/_gtkmain.py
new file mode 100755
index 0000000..33a6a83
--- /dev/null
+++ b/olpcgames/_gtkmain.py
@@ -0,0 +1,70 @@
+"""Support for GObject mainloop-requiring libraries when not inside GTK
+
+INITIALIZED -- whether we have a running gobject loop yet...
+LOOP_TRACKER -- if present, the manual gtk event loop used to 
+    support gobject-based code running in a non-Gobject event loop
+
+Holder -- objects which can be held as attributes to keep the mainloop running
+"""
+import threading, logging
+log = logging.getLogger( 'olpcgames._gtkmain' )
+##log.setLevel( logging.DEBUG )
+
+INITIALIZED = False
+LOOP_TRACKER = None
+
+class _TrackLoop( object ):
+    """Tracks the number of open loops and stops when finished"""
+    count = 0
+    _mainloop = None
+    def increment( self ):
+        log.info( 'Increment from %s', self.count )
+        self.count += 1 # XXX race condition here?
+        if self.count == 1:
+            log.info( 'Creating GObject mainloop')
+            self.t_loop = threading.Thread(target=self.loop)
+            self.t_loop.setDaemon( True )
+            self.t_loop.start()
+    def decrement( self ):
+        log.info( 'Decrement from %s', self.count )
+        self.count -= 1
+    def loop( self ):
+        """Little thread loop that replicates the gtk mainloop"""
+        import gtk
+        while self.count >= 1:
+            log.debug( 'GTK loop restarting' )
+            while gtk.events_pending():
+                gtk.main_iteration()
+        log.debug( 'GTK loop exiting' )
+        try:
+            del self.t_loop
+        except AttributeError, err:
+            pass
+
+class Holder():
+    """Object which, while held, keeps the gtk mainloop running"""
+    def __init__( self ):
+        log.info( 'Beginning hold on GTK mainloop with Holder object' )
+        startGTK()
+    def __del__( self ):
+        log.info( 'Releasing hold on GTK mainloop with Holder object' )
+        stopGTK()
+
+def startGTK( ):
+    """GTK support is required here, process..."""
+    if not INITIALIZED:
+        init()
+    if LOOP_TRACKER:
+        LOOP_TRACKER.increment()
+def stopGTK( ):
+    """GTK support is no longer required, release"""
+    if LOOP_TRACKER:
+        LOOP_TRACKER.decrement()
+def init( ):
+    """Create a gobject mainloop in a sub-thread (you don't need to call this normally)"""
+    global INITIALIZED, LOOP_TRACKER
+    if not INITIALIZED:
+        if not LOOP_TRACKER:
+            LOOP_TRACKER = _TrackLoop()
+        INITIALIZED = True
+    return LOOP_TRACKER
--
cgit v0.9.1