Ka-Ping Yee wrote:
> On Sun, 15 May 2005, Shane Hathaway wrote:
>
>>You might add to the PEP the following example, which could really
>>improve the process of building GUIs in Python:
>>
>> class MyFrame(Frame):
>> def __init__(self):
>> with Panel():
>> with VerticalBoxSizer():
>> self.text = TextEntry()
>> self.ok = Button('Ok')
>
>
> I don't understand how this would be implemented. Would a widget
> function like 'TextEntry' set the parent of the widget according to
> some global 'parent' variable? If so, how would 'Panel' know that
> its parent is supposed to be the 'MyFrame' object?
Try this version, which I sent to Nick earlier:
class MyFrame(Frame):
def __init__(self):
with Panel(self):
with VerticalBoxSizer(self):
self.text = TextEntry(self)
self.ok = Button(self, 'Ok')
The 'self' parameter tells the component to add itself to the current
parent inside the Frame. The current parent is a temporary variable set
by 'with' statements. Outside any 'with' statement, the current parent
is the frame.
There is only a little magic. Maybe someone can find an even less
magical pattern, but it's a lot easier to read and write than the status
quo:
class MyFrame(Frame):
def __init__(self):
p = Panel()
self.add(p)
sizer = VerticalBoxSizer(p)
p.add(sizer)
self.text = TextEntry()
sizer.add(self.text)
self.ok = Button('Ok')
sizer.add(self.ok)
Shane
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