-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 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 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)
git.cweiske.de / enigma2.git / blobdiff