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dynamic method question

P: n/a
So in the code below, I'm binding some events to a text control in
wxPython. The way I've been doing it is demonstrated with the
Lame_Event_Widget class. I want to factor out the repeating
patterns. Cool_Event_Widget is my attempt at this. It pretty much
works, but I have a feeling there's a better way of doing this. Also,
I couldn't get the Cool_Text_Control to override the on_text method.
How would I do that?

-------------

import textwrap, new

import wx
class Lame_Event_Widget:
def bind_events(self):
self.Bind(wx.EVT_LEFT_DOWN, self.on_left_down)
self.Bind(wx.EVT_RIGHT_DOWN, self.on_right_down)
self.Bind(wx.EVT_MIDDLE_DOWN, self.on_middle_down)
self.Bind(wx.EVT_LEFT_UP, self.on_left_up)
self.Bind(wx.EVT_RIGHT_UP, self.on_right_up)
self.Bind(wx.EVT_TEXT, self.on_text)

def on_left_down(self, e):
print "lame normal method: on_left_down"
e.Skip()

def on_right_down(self, e):
print "lame normal method: on_right_down"
e.Skip()

def on_middle_down(self, e):
print "lame normal method: on_middle_down"
e.Skip()

def on_left_up(self, e):
print "lame normal method: on_left_up"
e.Skip()

def on_right_up(self, e):
print "lame normal method: on_right_up"
e.Skip()

def on_text(self, e):
print "lame normal method: on_text"
e.Skip()
class Cool_Event_Widget:
def bind_events(self):
method_names = textwrap.dedent(
"""
on_left_down, on_right_down, on_middle_down,
on_left_up, on_right_up, on_middle_up,
on_text"""
).replace("\n", "").split(", ")

for name in method_names:
event_name = name.partition("_")[2]
event_name = "wx.EVT_" + event_name.upper()

exec("def " + name + "(self, e):\n" +
" print 'cool dynamic method: " + name + "'\n" +
" e.Skip()\n"
"self." + name + " = new.instancemethod(" + name + ",
self, self.__class__)\n"
"self.Bind(" + event_name + ", self." + name + ")")
if __name__ == "__main__":
app = wx.App()
frame = wx.Frame(None)
panel = wx.Panel(frame)
sizer = wx.BoxSizer(wx.VERTICAL)
panel.SetSizer(sizer)

class Cool_Text_Control(wx.TextCtrl, Cool_Event_Widget):
def __init__(self, parent):
wx.TextCtrl.__init__(self, parent)
self.bind_events()

def on_text(self, e):
print "modified text in Cool_Text_Control"

class Lame_Text_Control(wx.TextCtrl, Lame_Event_Widget):
def __init__(self, parent):
wx.TextCtrl.__init__(self, parent)
self.bind_events()

def on_text(self, e):
print "modified text in Lame_Text_Control"

sizer.Add(Cool_Text_Control(panel))
sizer.Add(Lame_Text_Control(panel))

frame.Show()
app.MainLoop()
Jun 27 '08 #1
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