from enigma import *
import time
+import sys
# some helper classes first:
class HTMLComponent:
return res
class GUISkin:
- data = { }
+ 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 """
self.notifier.append(i)
if self.notifierAdded:
self.notifierAdded(i)
+
+ # 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"""
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):
return self.getText()
class Button(HTMLComponent, GUIComponent, VariableText):
- onClick = {}
-
def __init__(self, text=""):
GUIComponent.__init__(self)
VariableText.__init__(self)
self.setText(text)
+ self.onClick = [ ]
- def click(self):
+ 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.clicked = [ self.click ]
+ g.selected.get().append(self.push)
return g
+
+ def GUIdeleteInstance(self, g):
+ g.selected.get().remove(self.push)
class Header(HTMLComponent, GUIComponent, VariableText):
g = eSlider(parent)
g.setRange(0, 100)
return g
-