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from enigma import *
import time
import sys
# some helper classes first:
class HTMLComponent:
def produceHTML(self):
return ""
class HTMLSkin:
order = ()
def __init__(self, order):
self.order = order
def produceHTML(self):
res = "<html>\n"
for name in self.order:
res += self[name].produceHTML()
res += "</html>\n";
return res
class GUISkin:
def __init__(self):
self.data = { }
def createGUIScreen(self, parent):
for (name, val) in self.items():
self.data[name] = { }
val.GUIcreate(self.data[name], parent, None)
def deleteGUIScreen(self):
for (name, val) in self.items():
w = self.data[name]["instance"]
val.GUIdelete(self.data[name])
del self.data[name]
# note: you'll probably run into this assert. if this happens, don't panic!
# yes, it's evil. I told you that programming in python is just fun, and
# suddently, you have to care about things you don't even know.
#
# but calm down, the solution is easy, at least on paper:
#
# Each Component, which is a GUIComponent, owns references to each
# instantiated eWidget (namely in screen.data[name]["instance"], in case
# you care.)
# on deleteGUIscreen, all eWidget *must* (!) be deleted (otherwise,
# well, problems appear. I don't want to go into details too much,
# but this would be a memory leak anyway.)
# The assert beyond checks for that. It asserts that the corresponding
# eWidget is about to be removed (i.e., that the refcount becomes 0 after
# running deleteGUIscreen).
# (You might wonder why the refcount is checked for 2 and not for 1 or 0 -
# one reference is still hold by the local variable 'w', another one is
# hold be the function argument to sys.getrefcount itself. So only if it's
# 2 at this point, the object will be destroyed after leaving deleteGUIscreen.)
#
# Now, how to fix this problem? You're holding a reference somewhere. (References
# can only be hold from Python, as eWidget itself isn't related to the c++
# way of having refcounted objects. So it must be in python.)
#
# It could be possible that you're calling deleteGUIscreen trough a call of
# a PSignal. For example, you could try to call screen.doClose() in response
# to a Button::click. This will fail. (It wouldn't work anyway, as you would
# remove a dialog while running it. It never worked - enigma1 just set a
# per-mainloop variable on eWidget::close() to leave the exec()...)
# That's why Session supports delayed closes. Just call Session.close() and
# it will work.
#
# Another reason is that you just stored the data["instance"] somewhere. or
# added it into a notifier list and didn't removed it.
#
# If you can't help yourself, just ask me. I'll be glad to help you out.
# Sorry for not keeping this code foolproof. I really wanted to archive
# that, but here I failed miserably. All I could do was to add this assert.
assert sys.getrefcount(w) == 2, "too many refs hold to " + str(w)
def close(self):
self.deleteGUIScreen()
del self.data
# note: components can be used in multiple screens, so we have kind of
# two contexts: first the per-component one (self), then the per-screen (i.e.:
# per eWidget one), called "priv". In "priv", for example, the instance
# of the eWidget is stored.
# GUI components have a "notifier list" of associated eWidgets to one component
# (as said - one component instance can be used at multiple screens)
class GUIComponent:
""" GUI component """
def __init__(self):
self.notifier = [ ]
def GUIcreate(self, priv, parent, skindata):
i = self.GUIcreateInstance(self, parent, skindata)
priv["instance"] = i
self.notifier.append(i)
try:
self.notifierAdded(i)
except:
pass
# GUIdelete must delete *all* references to the current component!
def GUIdelete(self, priv):
g = priv["instance"]
self.notifier.remove(g)
self.GUIdeleteInstance(g)
del priv["instance"]
def GUIdeleteInstance(self, priv):
pass
class VariableText:
"""VariableText can be used for components which have a variable text, based on any widget with setText call"""
def __init__(self):
self.message = ""
def notifierAdded(self, notifier):
notifier.setText(self.message)
def setText(self, text):
if self.message != text:
self.message = text
for x in self.notifier:
x.setText(self.message)
def getText(self):
return self.message
class VariableValue:
"""VariableValue can be used for components which have a variable value (like eSlider), based on any widget with setValue call"""
def __init__(self):
self.value = 0
def notifierAdded(self, notifier):
notifier.setValue(self.value)
def setValue(self, value):
if self.value != value:
self.value = value
for x in self.notifier:
x.setValue(self.value)
def getValue(self):
return self.value
# now some "real" components:
class Clock(HTMLComponent, GUIComponent, VariableText):
def __init__(self):
VariableText.__init__(self)
GUIComponent.__init__(self)
self.doClock()
self.clockTimer = eTimer()
self.clockTimer.timeout.get().append(self.doClock)
self.clockTimer.start(1000)
# "funktionalitaet"
def doClock(self):
self.setText("clock: " + time.asctime())
# realisierung als GUI
def GUIcreateInstance(self, priv, parent, skindata):
g = eLabel(parent)
return g
# ...und als HTML:
def produceHTML(self):
return self.getText()
class Button(HTMLComponent, GUIComponent, VariableText):
def __init__(self, text=""):
GUIComponent.__init__(self)
VariableText.__init__(self)
self.setText(text)
self.onClick = [ ]
def push(self):
for x in self.onClick:
x()
return 0
# html:
def produceHTML(self):
return "<input type=\"submit\" text=\"" + self.getText() + "\">\n"
# GUI:
def GUIcreateInstance(self, priv, parent, skindata):
g = eButton(parent)
g.selected.get().append(self.push)
return g
def GUIdeleteInstance(self, g):
g.selected.get().remove(self.push)
class Header(HTMLComponent, GUIComponent, VariableText):
def __init__(self, message):
GUIComponent.__init__(self)
VariableText.__init__(self)
self.setText(message)
def produceHTML(self):
return "<h2>" + self.getText() + "</h2>\n"
def GUIcreateInstance(self, priv, parent, skindata):
g = eLabel(parent)
g.setText(self.message)
return g
class VolumeBar(HTMLComponent, GUIComponent, VariableValue):
def __init__(self):
GUIComponent.__init__(self)
VariableValue.__init__(self)
def GUIcreateInstance(self, priv, parent, skindata):
g = eSlider(parent)
g.setRange(0, 100)
return g
class MenuList(HTMLComponent, GUIComponent):
def __init__(self, list):
GUIComponent.__init__(self)
self.l = eListboxPythonStringContent()
self.l.setList(list)
def getCurrent(self):
return self.l.getCurrentSelection()
def GUIcreateInstance(self, priv, parent, skindata):
g = eListbox(parent)
g.setContent(self.l)
return g
def GUIdeleteInstance(self, g):
g.setContent(None)
class ServiceList(HTMLComponent, GUIComponent):
def __init__(self):
GUIComponent.__init__(self)
self.l = eListboxServiceContent()
def GUIcreateInstance(self, priv, parent, skindata):
g = eListbox(parent)
g.setContent(self.l)
return g
def GUIdeleteInstance(self, g):
g.setContent(None)
def setRoot(self, root):
self.l.setRoot(root)
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