add onShown eventlist for executing stuff after the screen is drawn

[enigma2.git] / lib / python / Screens / Screen.py

diff --git a/lib/python/Screens/Screen.py b/lib/python/Screens/Screen.py
index a95c765502c4f84c837eb2ab4c37a12658a22557..13e31d671113c77bfb587c7dd018c19c469a1b55 100644 (file)
--- a/lib/python/Screens/Screen.py
+++ b/lib/python/Screens/Screen.py
@@ -11,11 +11,24 @@ class Screen(dict, HTMLSkin, GUISkin):
                self.session = session
                GUISkin.__init__(self)
                
+               self.onClose = [ ]
+               self.onExecBegin = [ ]
+               self.onShown = [ ]
+               
+               # in order to support screens *without* a help,
+               # we need the list in every screen. how ironic.
+               self.helpList = [ ]
+               
        def execBegin(self):
+               for x in self.onExecBegin:
+                       x()
 #              assert self.session == None, "a screen can only exec one per time"
 #              self.session = session
                for (name, val) in self.items():
                        val.execBegin()
+
+               for x in self.onShown:
+                       x()
        
        def execEnd(self):
                for (name, val) in self.items():
@@ -25,6 +38,11 @@ class Screen(dict, HTMLSkin, GUISkin):
        
        # never call this directly - it will be called from the session!
        def doClose(self):
+               for x in self.onClose:
+                       x()
+               
+               # fixup circular references
+               del self.helpList
                GUISkin.close(self)
                
                del self.session