OptionMenu is modified. Somewhat rewritten and elaborated by myself.
class _setit: The constructor now takes an optional argument
`callback' and stashes this in a private variable. If set, the
__call__() method will invoke this callback after the variable's value
has changed. It will pass the callback the value, followed by any
args passed to __call__().
class OptionMenu: The constructor now takes keyword arguments, the
only one that's legally recognized is `command', which can be set to a
callback. This callback is invoked when the OptionMenu value is set.
Any other keyword argument throws a TclError.
and Toplevel class constructors. This means that if the window
manager closes the window, the Python-side Tkinter data structures
will be destroyed correctly. (Most apps do this anyway, and it's
recommended practice; I see no reason why making it the default
behavior could be bad.)
bindings to a dictionary _tagcommands which was otherwise unused.
(This was checked in accidentally with rev. 1.125 and not deleted with
rev. 1.127 when the other half of this code was removed -- although
even as originally checked in the _tagcommands variable was never
used.)
(PR#40, reported by Peter Stoehr)
than was worth it: when deleting a canvas item, it would try to
automatically delete the bindings for that item. Since there's
nothing that says you can't reuse the tag and still have the bindings,
this is not correct. Also, it broke at least one demo
(Demo/tkinter/matt/rubber-band-box-demo-1.py).
so the preferred name for them is tag_lower, tag_raise
(similar to tag_bind, and similar to the Text widget);
unfortunately can't delete the old ones yet (maybe in 1.6)
An attempt to execute grid_slaves with arguments (0,0) results in
*all* of the slaves being returned, not just the slave associated with
row 0, column 0. This is because the test for arguments in the method
does not test to see if row (and column) does not equal None, but
rather just whether is evaluates to non-false. A value of 0 fails
this test.
in autoexec.bat in order to find the Tcl DLLs -- Tkinter calls FixTk
which will hunt around in a few common places and then set PATH
and try again, or else issue a big clarifying error message.
assign the exception info to sys.last_{type,value,traceback}. That
way, an introspective Tkinter app can inspect its own stack trace.
(The controversy is that it would keep some objects alive, but that's
probably no big deal.)
Fix bug in NoDefaultRoot() -- _default_root wasn't declared global;
and made it reentrant.
Don't set _default_root to whatever master gets passed in to
BaseWidget._setup() (only set it when we need to create a new Tk()
widget).
wm_title(), etc. The old names (title() etc.) are still defined as
aliases.
This brings all methods up to use the same naming convention: whether
the Tcl syntax is
.window.path.name command subcommand [options]
or
command subcommand .window.path.name [optins]
the Python equivalent is always
windowobject.command_subcommand(options)
calling self.tk.getint() and self.tk.getdouble(), call the globals
getint() and getdouble(), which in turn are just names for the Python
builtins int() and double(). (Making them globals actually save a
dict lookup compared to using the built-in.) The corresponding
methods of class Misc have been changed similarly. (Note that
getboolean() hasn't been changed because there's no Python
equivalent.)
The use of int() and float() has another advantage: if/when Tcl calls
can actually return Tcl objects with other types than string, use of
int() and float() is essential.
not needed to say apply(self.tk.call, t); self.tk.call(t) has the same
effect. This cuts down tremendously on the number of apply() calls
made. No measurable effect, but at the very least it saves the lookup
of apply() in the globals!
* The invoke methods of the three Tkinter widgets Button,
Checkbutton and Radiobutton should return the value returned by
the callback, (like the Menu widget does):
def invoke(self):
return self.tk.call(self._w, 'invoke')
* The select_from method of the Canvas widget should use 'from', not
'set':
def select_from(self, tagOrId, index):
self.tk.call(self._w, 'select', 'from', tagOrId, index)
Currently, if you use select_from, you get the error message:
'TclError: bad select option "set": must be adjust, clear, from, item, or to'
* The 'entrycget' and 'type' methods of the Tk menu widget are
missing from Tkinter.
* There is a bug in grid_columnconfigure and grid_rowconfigure. For
example, this should return the current value of the 'minsize'
option for column 0:
f.grid_columnconfigure(0, 'minsize')
Instead it returns the same as:
f.grid_columnconfigure(0)
I suggest that the hint given in the comment in the
Tkinter.Misc.configure method should be followed - "ought to
generalize this so tag_config etc. can use it". Repeating the
same configure code several times in Tkinter is inviting errors.
[I did not follow this advice --G]
* The grid_slaves method should handle options. Currently, to pass
options to the grid_slaves method, you have to do something like:
grid_slaves('-row', 1)
Guido van Rossum
Barry Warsaw
Fred Drake