[wxPython] EVT_CHAR_HOOK troubles... (fwd)
Miles Clark
Hi -
I sent this a few days ago, with no response. I'm resending in case it
was lost in the ether somewhere.
Is this the way OnCharHook/EVT_CHAR_HOOK is supposed to work, or is there
something wrong with the code?
thanks in advance!
---------- Forwarded message ----------
Date: Fri, 25 Feb 2000 10:44:45 -0800 (Pacific Standard Time)
From: Miles Clark <m...@obispo.com>
To: wxpytho...@server.python.net
Subject: [wxPython] EVT_CHAR_HOOK troubles...
Hi -
I'm attempting to use the CharHook event on a frame to capture all
keyboard events sent to the frame or any of it's child
windows. OnCharHook() is succesfully called for non-printable characters
(Shift, tab, escape, enter, F1, etc), but NOT called for printable
characters ('a', '1', '%', etc.).
I've tried various approaches (using a wxWindow instead of a wxPanel,
using the wxWANTS_CHARS style on the frame, etc.), with no luck.
Any ideas on what I'm doing wrong?
Thanks!
Sample code:
------------
#!/usr/bin/python
from wxPython.wx import *
class MyFrame(wxFrame):
def __init__(self, parent, id, title):
wxFrame.__init__(self, parent, id, title,
wxDefaultPosition, wxSize(400, 400))
self.panel = wxPanel(self, -1)
wxStaticText(self.panel, -1, "wxTextCtrl", wxPoint(5, 25),
wxSize(75, 20))
self.tc = wxTextCtrl(self.panel, 10, "", wxPoint(80, 25),
wxSize(200, 30))
EVT_CHAR_HOOK(self, self.OnCharHook)
EVT_CHAR(self, self.OnChar)
self.panel.Layout()
return
def OnCloseWindow(self, event):
self.Destroy()
return
def OnChar(self, event):
print "OnChar: %d '%c'" % (event.KeyCode(), chr(event.KeyCode()))
event.Skip()
return
def OnCharHook(self, event):
print "OnCharHook: %d" % event.KeyCode()
event.Skip()
return
class MyApp(wxApp):
def OnInit(self):
frame = MyFrame(None, -1, 'CharHook Test')
frame.Show(1)
self.SetTopWindow(frame)
return 1
if __name__ == "__main__":
app = MyApp(0)
app.MainLoop()
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Robin Dunn
> I sent this a few days ago, with no response. I'm resending in case it
> was lost in the ether somewhere.
>
> Is this the way OnCharHook/EVT_CHAR_HOOK is supposed to work, or is there
> something wrong with the code?
>
>
Looking at the C++ code it seems that most ASCII keys are being ignored by
the keyhook function. I don't think this is right so I have asked about it
on the wx-devel list.
--
Robin Dunn
Software Craftsman
ro...@AllDunn.com
http://AllDunn.com/robin/
http://AllDunn.com/wxPython/ Check it out!
michael_haider
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Sent from the wxPython-users mailing list archive at Nabble.com.
Robin Dunn
> is there a solution? having the same problem (on win7) linux works already...
>
that it really is exactly the same problem. What, exactly, are you
trying to do and why? How are you attempting to do it? What isn't
working? What versions are you using? Can you provide a small,
runnable, standalone application that demonstrates the problem?
http://wiki.wxpython.org/MakingSampleApps
--
Robin Dunn
Software Craftsman
Michael Haider
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Werner
> same bug 13 years later?? :-)
wxPython.
> i try to capture all keyboard events sent to a frame.
> Today I detected that in version 2.9.4.0 all works fine but in stable
> version 2.8.12.1 the "normal" characters (eg. "a","b") are not
> captured but ("F1","F2",".",",") are captured. (german keyboard)
> on my linux (debian) machine 2.8.10.1 is installed and all works fine
>
> attached you find a small example..
This works both on 2.8 and 2.9.5 at least on Windows:
self.tc.Bind(wx.EVT_CHAR_HOOK, self.OnCharHook)
self.tc.Bind(wx.EVT_CHAR, self.OnChar)
And this wiki might help too and I am sure Robin or someone else will
explain it in more detail.
http://wiki.wxpython.org/self.Bind%20vs.%20self.button.Bind
Werner
Michael Haider
you bind the events to the wx.TextCtrl ...
but i bind it to the Frame, and there happens these things...
self.Bind(wx.EVT_CHAR_HOOK, self.OnCharHook)
I only need to get the EVT_CHAR_HOOK event; EVT_CHAR was only for
testing....
Mit freundlichen Grￜￜen
Michael Haider
Hofstï¿œdtler IE GMBH
email: michael...@hofstaedtler.com
homepage: http://www.hofstaedtler.com
Tel.: 02622/21550
Fax.: 02622/21550-5
>>> Werner <werner...@sfr.fr> 19.12.2012 10:50 >>>
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Werner
thanks for your answer...
you bind the events to the wx.TextCtrl ...
but i bind it to the Frame, and there happens these things...
self.Bind(wx.EVT_CHAR_HOOK, self.OnCharHook)
I only need to get the EVT_CHAR_HOOK event; EVT_CHAR was only for
testing....
wx.Event vs. wx.CommandEvent
First things first. When searching for a binding for a particular event, wxPython will search up the containment hierarchy (parent windows) for events that are instances of wx.CommandEvent, but will not for those that are not. There are several reasons for this, which we won't go into here. Just treat it as a fact of life; be happy and move on....
Wernerhttp://wiki.wxpython.org/self.Bind%20vs.%20self.button.Bind
Michael Haider
because in older version it worked ... in newer version it works
in 2.8.12.1 it doesn't....
Mit freundlichen Grￜￜen
Michael Haider
Hofstï¿œdtler IE GMBH
email: michael...@hofstaedtler.com
homepage: http://www.hofstaedtler.com
Tel.: 02622/21550
Fax.: 02622/21550-5
> thanks for your answer...
> you bind the events to the wx.TextCtrl ...
> but i bind it to the Frame, and there happens these things...
>
> self.Bind(wx.EVT_CHAR_HOOK, self.OnCharHook)
>
> I only need to get the EVT_CHAR_HOOK event; EVT_CHAR was only for
> testing....
Check out the wiki page, isn't this the explanation?
wx.Event vs. wx.CommandEvent
First things first. When searching for a binding for a particular
event,
wxPython will search up the containment hierarchy (parent windows) for
that are not. There are several reasons for this, which we won't go
into
here. Just treat it as a fact of life; be happy and move on.
...
> http://wiki.wxpython.org/self.Bind%20vs.%20self.button.Bind
Werner
Werner
> no....
> because in older version it worked ... in newer version it works
> in 2.8.12.1 it doesn't....
documentation search and googling.
According to the docs the EVT_CHAR_HOOK is an exception to the rule and
it should propagate up the hierarchy.
http://wxpython.org/Phoenix/docs/html/KeyEvent.html
But then I found this thread from 12 years ago which more or less says
don't use it. So, maybe that means that the above documentation should
be updated in some form.
https://groups.google.com/forum/?fromgroups=#!topic/wx-users/OBuzhzy2H5s
Werner
BTW, most of us here prefer bottom and/or interspersed posting as it is
easier to follow over time.
Robin Dunn
> same bug 13 years later?? :-)
platforms that were the biggest problems back then.
>
> i try to capture all keyboard events sent to a frame.
> Today I detected that in version 2.9.4.0 all works fine but in stable
> version 2.8.12.1 the "normal" characters (eg. "a","b") are not captured
> but ("F1","F2",".",",") are captured. (german keyboard)
> on my linux (debian) machine 2.8.10.1 is installed and all works fine
wxPython to that version. The 2.8 series is receiving very little
developer attention these days.