Tkinter Event Types

[codecraig]

Hi,
When I do something like.

s = Scale(master)
s.bind("<ENTER>", callback)

def callback(self, event):
print event.type

I see "7" printed out. Where are these constants defined for various
event types? Basically i want to do something like...

def callback(self, event):
if event.type == ENTER:
print "You entered"

thanks

 

[tiissa]

Hi,
When I do something like.

s = Scale(master)
s.bind("<ENTER>", callback)

def callback(self, event):
print event.type

I see "7" printed out. Where are these constants defined for various
event types? Basically i want to do something like...

7 must be for KeyPressed.
That's the type of the event (among Activate, Button, KeyPressed...).

def callback(self, event):
if event.type == ENTER:
print "You entered"

You may want to look at event.keycode (36 for Return).

 

[Jeff Epler]

The "type" field is related to the definition of different events in
X11. In Xlib, the event structure is a "C" union with the first
(common) field giving the type of the event so that the event-dependant
fields can be accessed through the proper union member.

Generally, you won't use this field in Tkinter programs.

jeff

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[Eric Brunel]

Hi,
When I do something like.

s = Scale(master)
s.bind("<ENTER>", callback)

def callback(self, event):
print event.type

I see "7" printed out. Where are these constants defined for various
event types? Basically i want to do something like...

def callback(self, event):
if event.type == ENTER:
print "You entered"

The usual way is to bind different callbacks on different events. So you won't have to test the event type in your callback, since the callback itself will already have been selected from the event type. If you insist in doing it the way you mention, you can always do:


ENTER_EVENT = 1
KEYPRESS_EVENT = 2
# ...

def myCallback(evtType, evt):
if evtType == ENTER_EVENT:
# some action...
elif evtType == KEYPRESS_EVENT:
# some other action...
# ...

myWidget.bind('<Enter>', lambda evt: myCallback(ENTER_EVENT, evt))
myWidget.bind('<KeyPress>', lambda evt: myCallback(KEYPRESS_EVENT, evt))


I can't really see what it will be good for however...

HTH