From 6be1dada2fde0e8e06220c9c509338c350123f0d Mon Sep 17 00:00:00 2001
From: Gary Martin <gary@garycmartin.com>
Date: Wed, 06 Oct 2010 17:56:32 +0000
Subject: Watch for focus events so that pygame run loop is more gracefully idle when in background.

---
diff --git a/activity.py b/activity.py
index bf6ac0f..a718257 100644
--- a/activity.py
+++ b/activity.py
@@ -44,6 +44,7 @@ class PhysicsActivity(olpcgames.PyGameActivity):
     def __init__(self, handle):
         super(PhysicsActivity, self).__init__(handle)
         self.metadata['mime_type'] = 'application/x-physics-activity'
+        self.connect('visibility-notify-event', self._focus_event)
 
     def get_preview(self):
         """Custom preview code to get image from pygame.
@@ -173,3 +174,10 @@ class PhysicsActivity(olpcgames.PyGameActivity):
         pygame.event.post(olpcgames.eventwrap.Event(pygame.USEREVENT, action=self.radioList[button]))
 
 
+    def _focus_event(self, event, data=None):
+        """Send focus events to pygame to allow it to more gracefully idle when in the background.
+        """
+        if data.state == gtk.gdk.VISIBILITY_FULLY_OBSCURED:
+            pygame.event.post(olpcgames.eventwrap.Event(pygame.USEREVENT, action="focus_out"))
+        else:
+            pygame.event.post(olpcgames.eventwrap.Event(pygame.USEREVENT, action="focus_in"))
diff --git a/physics.py b/physics.py
index bf95a93..3dd5060 100644
--- a/physics.py
+++ b/physics.py
@@ -78,32 +78,34 @@ class PhysicsGame:
         self.show_fake_cursor = True
 
     def run(self):
+        self.in_focus = True
         while True:
             for event in pygame.event.get():
                 self.currentTool.handleEvents(event)
 
-            # Drive motors
-            if self.world.run_physics:
-                for body in self.world.world.GetBodyList():
-                    if type(body.userData) == type({}):
-                        if body.userData.has_key('rollMotor'):
-                            diff = body.userData['rollMotor']['targetVelocity'] - body.GetAngularVelocity()
-                            body.ApplyTorque(body.userData['rollMotor']['strength'] * diff * body.getMassData().I)
-
-            # Update & Draw World
-            self.world.update()
-            self.screen.fill((255, 255, 255)) # 255 for white
-            self.world.draw()
-
-            # Draw output from tools
-            self.currentTool.draw()
-
-            # Show Sugar like cursor for UI consistancy
-            if self.show_fake_cursor:
-                self.screen.blit(self.cursor_picture, pygame.mouse.get_pos())
-
-            # Flip Display
-            pygame.display.flip()
+            if self.in_focus:
+                # Drive motors
+                if self.world.run_physics:
+                    for body in self.world.world.GetBodyList():
+                        if type(body.userData) == type({}):
+                            if body.userData.has_key('rollMotor'):
+                                diff = body.userData['rollMotor']['targetVelocity'] - body.GetAngularVelocity()
+                                body.ApplyTorque(body.userData['rollMotor']['strength'] * diff * body.getMassData().I)
+
+                # Update & Draw World
+                self.world.update()
+                self.screen.fill((255, 255, 255)) # 255 for white
+                self.world.draw()
+
+                # Draw output from tools
+                self.currentTool.draw()
+
+                # Show Sugar like cursor for UI consistancy
+                if self.show_fake_cursor:
+                    self.screen.blit(self.cursor_picture, pygame.mouse.get_pos())
+
+                # Flip Display
+                pygame.display.flip()
 
             # Stay under 30 FPS to help keep the rest of the platform responsive
             self.clock.tick(30) # Originally 50
diff --git a/tools.py b/tools.py
index 75a3440..c3877b9 100644
--- a/tools.py
+++ b/tools.py
@@ -48,6 +48,10 @@ class Tool(object):
                 if event.action == "stop_start_toggle":
                     # Stop/start simulation
                     self.game.world.run_physics = not self.game.world.run_physics
+                elif event.action == "focus_in":
+                    self.game.in_focus = True
+                elif event.action == "focus_out":
+                    self.game.in_focus = False
                 elif self.game.toolList.has_key(event.action):
                     self.game.setTool(event.action)
             elif hasattr(event,"code"):
--
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