| msg124287 - (view) |
Author: Marc Culler (culler) * |
Date: 2010-12-18 15:22 |
| In OS X tkinter the "two-finger scroll" generates events. The following code: #### bug.py import tkinter def mouse_wheel(event): print('Mouse wheel event') tk = tkinter.Tk() list = tkinter.Listbox(tk) list.bind('', mouse_wheel) for n in range(20): list.insert(tkinter.END, str(n**n)) list.pack(fill=tkinter.BOTH, expand=1) tk.mainloop() #### often throws a UnicodeDecodeError exception with a traceback like the one shown below when you do a "two-finger scroll" in the window. Traceback (most recent call last): File "bug.py", line 12, in tk.mainloop() File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/tkinter/__init__.py", line 1009, in mainloop self.tk.mainloop(n) UnicodeDecodeError: 'utf8' codec can't decode byte 0x84 in position 1: unexpected code byte The value of the byte changes from time to time, and sometimes it may be possible to scroll a few times without producing the error. This problem did not occur on my Mandriva 2010.2 system. I think it is specific to the Macintosh. It might possibly be related to: http://bugs.python.org/issue834351 |
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| msg140666 - (view) |
Author: Ronald Oussoren (ronaldoussoren) *  |
Date: 2011-07-19 13:33 |
| This is almost certainly a bug in Tk. What OSX version are you using, and which python installer did you use? One thing you could try is installing a matching copy of ActiveState's Tk (8.4 for the 32-bit build, 8.5 for intel-only builds of python 2.7 and 3.2) |
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| msg141052 - (view) |
Author: Marc Culler (culler) * |
Date: 2011-07-24 18:55 |
| I am running OSX 10.5.8 on this macbook. The Tcl/Tk package on the system is ActiveState Tcl/Tk 8.4.19. I just installed Python 3.2 (r32:88452, Feb 20 2011, 10:19:59) from http://www.python.org/getit/releases/3.2/ and I am still seeing this bug. It does not occur with the Python 2.7 Tkinter package, which uses the same Tcl/Tk framework. So if it is a bug in Tk, it is harmless when used with Python 2.7. But, after all, it is not so surprising to see new UnicodeDecodeErrors when porting from Python 2 to Python 3. |
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| msg158936 - (view) |
Author: Ned Deily (ned.deily) * |
Date: 2012-04-21 23:36 |
| The exception also occurs with Python 3.3 linked with Cocoa Tk 8.5. However, the it does not appear when Python 3.x is linked with Carbon Tk 8.4. |
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| msg158946 - (view) |
Author: Ned Deily (ned.deily) * |
Date: 2012-04-22 04:40 |
| It looks like the problem is that the current Cocoa Tcl/Tk 8.5.x returns an incorrect MouseWheel event. Using the supplied test program and breakpointing in PythonCmd (around Modules/_tkinter.c:2027 in default), I found that it is being called from Tcl for MouseWheel events with an "argc" of 20, which looks suspiciously like the length of argv[1], "4302153816mouse_wheel", rather than the number of arguments which should be more like 3. It may also be an issue that affects Python because _tkinter still uses the older Tcl_CreateCommand interface rather than the newer Tcl_CreateObjCommand. The same Tcl behavior is observed with Python 2.7 _tkinter.c but there the bogus arguments are translated using PyString_FromString which is unaffected by the garbage arguments. It might be possible to workaround this problem in _tkinter but the next step is to open a Tcl/Tk issue against the Cocoa implementation and push for a proper fix there. http://www.tcl.tk/man/tcl8.5/TclLib/CrtCommand.htm |
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| msg158947 - (view) |
Author: Ned Deily (ned.deily) * |
Date: 2012-04-22 04:56 |
| I've opened Tk Toolkit bug 3520202: https://sourceforge.net/tracker/?func=detail&aid=3520202&group_id=12997&atid=112997 |
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| msg158966 - (view) |
Author: Kevin Walzer (wordtech) * |
Date: 2012-04-22 15:09 |
| I've added some comments to this on the Tkinter-dev mailing list, but to summarize, the bug is not reproducible on the Tcl side of the bridge, and so I am not clear what changes can be made in Tk's internals. It might e better to proceed with implementing a fix in Tkinter because the bug seems to occur at the level of Tkinter/Tk interaction. |
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| msg159050 - (view) |
Author: Ned Deily (ned.deily) * |
Date: 2012-04-23 17:34 |
| A potential fix has been generated for Tk. I'll close this issue once the fix has been verified with _tkinter. |
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| msg167198 - (view) |
Author: Ned Deily (ned.deily) * |
Date: 2012-08-02 07:58 |
| Tcl/Tk 8.5.12 has now been released. After installing ActiveTcl 8.5.12 for OS X, your 3.2 test case that previously readily failed for me no longer does. So I hope you also find that the problem is now resolved. |
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| msg167242 - (view) |
Author: Marc Culler (Marc.Culler) * |
Date: 2012-08-02 17:23 |
| Thanks, Ned! It seems to be completely fixed by 8.5.12. |
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| msg218941 - (view) |
Author: Dougal Graham (Dougal.Graham) |
Date: 2014-05-23 03:24 |
| I recenly encuntered this error in OSX 10.9.2, using pthon 3.3 and 3.4 from Homebrew. I tried installing activetcl 8.6 package, but it still fails dependably. |
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| msg218943 - (view) |
Author: Dougal Graham (Dougal.Graham) |
Date: 2014-05-23 03:55 |
| I have resolved this by using the official Python distribution, rather than Homebrew's. |
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