From: Neil <neil@dip.sun.ac.za>
Date: Sun, 11 May 2014 19:52:20 +0000 (+0200)
Subject: The world is invalid (sometimes, when desirable)
X-Git-Tag: 0.1~392^2
X-Git-Url: https://git.ctpug.org.za/?p=naja.git;a=commitdiff_plain;h=4e27b4e10d7fd4f66097ece17a8c51b80233a363

The world is invalid (sometimes, when desirable)
---

diff --git a/naja/events.py b/naja/events.py
index 4d3fb07..0e102ed 100644
--- a/naja/events.py
+++ b/naja/events.py
@@ -35,3 +35,13 @@ class QuitGameEvent(NajaEvent):
     @classmethod
     def post(cls):
         super(QuitGameEvent, cls).post()
+
+
+class InvalidateTheWorld(NajaEvent):
+    # This is used to signal to all the widgets that the world has changed
+    # and cached state may need to be recreated
+    TYPE = "INVALIDATE"
+
+    @classmethod
+    def post(cls):
+        super(InvalidateTheWorld, cls).post()
diff --git a/naja/widgets/base.py b/naja/widgets/base.py
index bda00a4..133cc53 100644
--- a/naja/widgets/base.py
+++ b/naja/widgets/base.py
@@ -1,4 +1,5 @@
 import pygame
+from naja.events import InvalidateTheWorld
 
 
 class Widget(object):
@@ -27,6 +28,11 @@ class Widget(object):
 
     def handle_event(self, ev):
         '''Return True if the event has been handled'''
+        if InvalidateTheWorld.matches(ev):
+            # Invalidate has special handling. Widgets should never return
+            # True for for this event
+            self._prepared = False
+            return False
         return False