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 = "\n" for name in self.order: res += self[name].produceHTML() res += "\n"; return res class GUISkin: def __init__(self): = { } def createGUIScreen(self, parent): for (name, val) in self.items():[name] = { } val.GUIcreate([name], parent, None) def deleteGUIScreen(self): for (name, val) in self.items(): w =[name]["instance"] val.GUIdelete([name]) del[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[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 session.close() 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 # 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 "\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 "

" + self.getText() + "

\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)