lib/python/Screens/Screen.py

   1 from Components.HTMLSkin import *
   2 from Components.GUISkin import *
   3
   4 import sys
   5
   6 class Screen(dict, HTMLSkin, GUISkin):
   7         """ bla """
   8
   9         def __init__(self, session):
  10                 self.skinName = self.__class__.__name__
  11                 self.session = session
  12                 GUISkin.__init__(self)
  13
  14                 self.onClose = [ ]
  15                 self.onExecBegin = [ ]
  16                 self.onShown = [ ]
  17
  18                 self.onShow = [ ]
  19                 self.onHide = [ ]
  20
  21                 self.execing = False
  22                 self.shown = False
  23
  24                 # in order to support screens *without* a help,
  25                 # we need the list in every screen. how ironic.
  26                 self.helpList = [ ]
  27
  28         def execBegin(self):
  29                 self.active_components = [ ]
  30                 for x in self.onExecBegin:
  31                         x()
  32                         if self.session.current_dialog != self:
  33                                 return
  34
  35 #               assert self.session == None, "a screen can only exec once per time"
  36 #               self.session = session
  37
  38                 for (name, val) in self.items():
  39                         val.execBegin()
  40                         if self.session.current_dialog != self:
  41                                 return
  42                         self.active_components.append(val)
  43
  44                 self.execing = True
  45
  46                 for x in self.onShown:
  47                         x()
  48
  49         def execEnd(self):
  50 #               for (name, val) in self.items():
  51                 for val in self.active_components:
  52                         val.execEnd()
  53                 del self.active_components
  54 #               assert self.session != None, "execEnd on non-execing screen!"
  55 #               self.session = None
  56                 self.execing = False
  57
  58         # never call this directly - it will be called from the session!
  59         def doClose(self):
  60                 self.hide()
  61                 for x in self.onClose:
  62                         x()
  63
  64                 # fixup circular references
  65                 del self.helpList
  66                 GUISkin.close(self)
  67
  68                 del self.session
  69                 for (name, val) in self.items():
  70                         del self[name]
  71
  72                 # really delete all elements now
  73                 self.__dict__.clear()
  74
  75         def close(self, *retval):
  76                 self.session.close(*retval)
  77
  78         def setFocus(self, o):
  79                 self.instance.setFocus(o.instance)
  80
  81         def show(self):
  82                 if self.shown:
  83                         return
  84                 self.shown = True
  85                 self.instance.show()
  86                 for x in self.onShow:
  87                         x()
  88                 for (name, val) in self.items():
  89                         if isinstance(val, GUIComponent):
  90                                 val.onShow()
  91
  92         def hide(self):
  93                 if not self.shown:
  94                         return
  95                 self.shown = False
  96                 self.instance.hide()
  97                 for x in self.onHide:
  98                         x()
  99                 for (name, val) in self.items():
 100                         if isinstance(val, GUIComponent):
 101                                 val.onHide()