[Patches] [ python-Patches-989712 ] Support using Tk without a mainloop

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Patches item #989712, was opened at 2004-07-12 23:16
Message generated for change (Comment added) made by noamr
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Category: IDLE
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Noam Raphael (noamr)
Assigned to: Kurt B. Kaiser (kbk)
Summary: Support using Tk without a mainloop

Initial Comment:
In the regular python shell, you can open Tk windows,
and they will operate even though you didn't call
Tkinter.mainloop(). This is useful, for example, when
you manipulate matplotlib graphs from within the python
shell.
This is done by a hook, installed when a tkapp object
is being initialized, which handles Tk events while the
shell is waiting for user input.

I imitated this behaviour in IDLE: When the subprocess
is idle, it checks whether Tkinter._default_root is set
(this happens when the Tkinter.Tk class, which makes a
tkapp object, is initialized, unless
Tkinter._use_default_root is False), and if so, handles
Tk events.

For me it works very well.

Have a good day,
Noam Raphael

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>Comment By: Noam Raphael (noamr)
Date: 2005-01-30 13:58

Message:
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in _tkinter.c, look for EventHook - you'll find the
EventHook function, which is called when the interpreter is
idle, and the Enable/Disable EventHook functions.

In readline.c, line 765, you'll find the call to
PyOS_InputHook, when waiting for input.

Perhaps a more general approach would be to let Python code
call PyOS_InputHook, for example, by defining
readline.call_input_hook() and readline.has_input_hook().
Then IDLE would be able to call them when idle, with no
Tkinter-specific code.

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Comment By: Kurt B. Kaiser (kbk)
Date: 2004-07-14 23:44

Message:
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Can you give me some more information on the hook in the
Python interpreter?  Where is it in the code?

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