add concept of 'related screen', which can be used to get shared sources (like clock...

[vuplus_dvbapp] / lib / python / Screens / Screen.py

diff --git a/lib/python/Screens/Screen.py b/lib/python/Screens/Screen.py
index 797acbc..4e3b117 100644 (file)
--- a/lib/python/Screens/Screen.py
+++ b/lib/python/Screens/Screen.py
@@ -1,37 +1,42 @@
-from Components.HTMLSkin import *
-from Components.GUISkin import *
+from Components.HTMLSkin import HTMLSkin
+from Components.GUISkin import GUISkin
 from Components.Sources.Source import Source
-
-import sys
+from Components.GUIComponent import GUIComponent
 
 class Screen(dict, HTMLSkin, GUISkin):
 
        ALLOW_SUSPEND = False
 
-       def __init__(self, session):
+       global_scren = None
+
+       def __init__(self, session, parent = None):
                self.skinName = self.__class__.__name__
                self.session = session
+               self.parent = parent
                GUISkin.__init__(self)
-               
+
                self.onClose = [ ]
                self.onFirstExecBegin = [ ]
                self.onExecBegin = [ ]
                self.onShown = [ ]
-               
+
                self.onShow = [ ]
                self.onHide = [ ]
-               
+
                self.execing = False
-               self.shown = False
                
+               self.shown = True
+               # already shown is false until the screen is really shown (after creation)
+               self.already_shown = False
+
                self.renderer = [ ]
-               
+
                # in order to support screens *without* a help,
                # we need the list in every screen. how ironic.
                self.helpList = [ ]
-               
+
                self.close_on_next_exec = None
-               
+
                # stand alone screens (for example web screens)
                # don't care about having or not having focus.
                self.stand_alone = False
@@ -114,9 +119,10 @@ class Screen(dict, HTMLSkin, GUISkin):
                self.instance.setFocus(o.instance)
 
        def show(self):
-               if self.shown:
+               if (self.shown and self.already_shown) or not self.instance:
                        return
                self.shown = True
+               self.already_shown = True
                self.instance.show()
                for x in self.onShow:
                        x()
@@ -125,7 +131,7 @@ class Screen(dict, HTMLSkin, GUISkin):
                                val.onShow()
 
        def hide(self):
-               if not self.shown:
+               if not self.shown or not self.instance:
                        return
                self.shown = False
                self.instance.hide()
@@ -137,3 +143,13 @@ class Screen(dict, HTMLSkin, GUISkin):
 
        def __repr__(self):
                return str(type(self))
+
+       def getRelatedScreen(self, name):
+               if name == "session":
+                       return self.session.screen
+               elif name == "parent":
+                       return self.parent
+               elif name == "global":
+                       return self.global_screen
+               else:
+                       return None