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# Code borrowed from ptpython
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# https://github.com/jonathanslenders/ptpython/blob/86b71a89626114b18898a0af463978bdb32eeb70/ptpython/eventloop.py
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# Copyright (c) 2015, Jonathan Slenders
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright notice, this
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# list of conditions and the following disclaimer in the documentation and/or
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# other materials provided with the distribution.
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#
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# * Neither the name of the {organization} nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""
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Wrapper around the eventloop that gives some time to the Tkinter GUI to process
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events when it's loaded and while we are waiting for input at the REPL. This
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way we don't block the UI of for instance ``turtle`` and other Tk libraries.
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(Normally Tkinter registeres it's callbacks in ``PyOS_InputHook`` to integrate
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in readline. ``prompt-toolkit`` doesn't understand that input hook, but this
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will fix it for Tk.)
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"""
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import time
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import _tkinter
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try:
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import tkinter
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except ImportError:
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import Tkinter as tkinter # Python 2
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def inputhook(inputhook_context):
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"""
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Inputhook for Tk.
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Run the Tk eventloop until prompt-toolkit needs to process the next input.
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"""
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# Get the current TK application.
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root = tkinter._default_root
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def wait_using_filehandler():
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"""
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Run the TK eventloop until the file handler that we got from the
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inputhook becomes readable.
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"""
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# Add a handler that sets the stop flag when `prompt-toolkit` has input
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# to process.
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stop = [False]
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def done(*a):
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stop[0] = True
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root.createfilehandler(inputhook_context.fileno(), _tkinter.READABLE, done)
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# Run the TK event loop as long as we don't receive input.
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while root.dooneevent(_tkinter.ALL_EVENTS):
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if stop[0]:
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break
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root.deletefilehandler(inputhook_context.fileno())
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def wait_using_polling():
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"""
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Windows TK doesn't support 'createfilehandler'.
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So, run the TK eventloop and poll until input is ready.
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"""
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while not inputhook_context.input_is_ready():
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while root.dooneevent(_tkinter.ALL_EVENTS | _tkinter.DONT_WAIT):
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pass
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# Sleep to make the CPU idle, but not too long, so that the UI
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# stays responsive.
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time.sleep(.01)
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if root is not None:
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if hasattr(root, 'createfilehandler'):
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wait_using_filehandler()
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else:
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wait_using_polling()
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