On Sat, Feb 17, 2001 at 01:36:27AM -0500, Buzz Megg wrote:
> Well, since I got such an overwhelming response to my previous query (ie.
> *nobody*) and attaching to keypress events was brought up recently, I
> thought that I'd try again.
>
> >From previous query:
> >Okay, I'm trying to get key_press events from a drawing area. My
> >solution works only for arrow keys. And then only if they are
> >pressed twice in a row. Any ideas what I'm doing wrong?
>
In GTK the arrow keys move the focus to another widget.
If you add a button or something to your example you can see it happening.
That's why you have to press twice in a row, so that the focus comes back
around to toppane.
Here's one solution:
#!/usr/bin/env python
from gtk import *
import GDK
def focus_in_impl (win, event):
win.set_flags (HAS_FOCUS)
return TRUE
def focus_out_impl (win, event):
win.unset_flags (HAS_FOCUS)
return TRUE
def enter_notify_impl (win, event):
win.grab_focus ()
return FALSE
def button_impl(win, event):
print event, "b =", event.button, "x =", event.x, "y =", event.y
win.grab_focus ()
return FALSE
def key_press_impl(win,event):
print "Key event received:",win,event, event.string
return TRUE
def quit(*args):
mainquit()
topwindow = GtkWindow()
topbox = GtkVBox()
topwindow.add(topbox)
topbox.show()
b = GtkButton ('blah')
topbox.pack_start (b)
toppane = GtkDrawingArea()
toppane.set_usize(200,200)
topbox.pack_start (toppane)
toppane.show()
toppane.set_events(GDK.ALL_EVENTS_MASK)
toppane.set_flags(CAN_FOCUS)
toppane.connect ("focus_in_event", focus_in_impl)
toppane.connect ("focus_out_event", focus_out_impl)
toppane.connect("button_press_event",button_impl)
toppane.connect ("enter_notify_event", enter_notify_impl)
#toppane.connect ("key_press_event",key_press_impl)
toppane.connect_after ("key_press_event",key_press_impl)
topwindow.connect("destroy",quit)
topwindow.connect("delete_event",quit)
topwindow.show_all()
mainloop()
This "works", but I'm not sure if it's the right way of doing things.
You can't do toppan.connect("key_press...) as opposed to
toppane.connect_after("key_press...) and you have to make sure that
key_press_impl() returns TRUE. I don't understand why.
I suppose the right way might be to use signal_emit_stop() or something,
but I don't know much about that either.
> Thanks,
> Andy
[snip]
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