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from Components.HTMLSkin import HTMLSkin
from Components.GUISkin import GUISkin
from Components.Sources.Source import Source
from Components.GUIComponent import GUIComponent
class Screen(dict, HTMLSkin, GUISkin):
ALLOW_SUSPEND = False
global_screen = 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 = 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
def execBegin(self):
self.active_components = [ ]
if self.close_on_next_exec is not None:
tmp = self.close_on_next_exec
self.close_on_next_exec = None
self.execing = True
self.close(*tmp)
else:
single = self.onFirstExecBegin
self.onFirstExecBegin = []
for x in self.onExecBegin + single:
x()
if not self.stand_alone and self.session.current_dialog != self:
return
# assert self.session == None, "a screen can only exec once per time"
# self.session = session
for val in self.values() + self.renderer:
val.execBegin()
if not self.stand_alone and self.session.current_dialog != self:
return
self.active_components.append(val)
self.execing = True
for x in self.onShown:
x()
def execEnd(self):
# for (name, val) in self.items():
for val in self.active_components:
val.execEnd()
del self.active_components
# assert self.session != None, "execEnd on non-execing screen!"
# self.session = None
self.execing = False
# never call this directly - it will be called from the session!
def doClose(self):
self.hide()
for x in self.onClose:
x()
# fixup circular references
del self.helpList
GUISkin.close(self)
# first disconnect all render from their sources.
# we might split this out into a "unskin"-call,
# but currently we destroy the screen afterwards
# anyway.
for val in self.renderer:
val.disconnectAll() # disconnected converter/sources and probably destroy them
del self.session
for (name, val) in self.items():
val.destroy()
del self[name]
for val in self.renderer:
val.destroy()
self.renderer = [ ]
# really delete all elements now
self.__dict__.clear()
def close(self, *retval):
if not self.execing:
self.close_on_next_exec = retval
else:
self.session.close(self, *retval)
def setFocus(self, o):
self.instance.setFocus(o.instance)
def show(self):
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()
for val in self.values() + self.renderer:
if isinstance(val, GUIComponent) or isinstance(val, Source):
val.onShow()
def hide(self):
if not self.shown or not self.instance:
return
self.shown = False
self.instance.hide()
for x in self.onHide:
x()
for val in self.values() + self.renderer:
if isinstance(val, GUIComponent) or isinstance(val, Source):
val.onHide()
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
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