Mailman 3 April 2012 - Tkinter-discuss

Control position of Tkinter common dialogs?
by python＠bdurham.com Dec. 9, 2016

Dec. 9, 2016

Python 2.7 under Windows: How can we control the position of Tkinter's common dialogs? Here's what we've discovered: * Certain common dialogs always open up relative to their parent window * Certain common dialogs always open up centered on the user's desktop * All common dialogs appear to ignore the optional parent= parameter Questions: * How can we force a dialog to open up relative to its parent window? * How can we force a dialog to open up centered on the user's desktop? Background: import tkColorChooser as colorchooser import tkFileDialog as filedialog import tkMessageBox as messagebox # always open up relative to parent windows fileOpen = filedialog.askopenfilename() fileOpens = filedialog.askopenfilenames() fileSaveAs = filedialog.asksaveasfilename() color = colorchooser.askcolor() # always open up centered on desktop folderOpen = filedialog.askdirectory() messagebox.askquestion() Malcolm

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Segfault in Image.PhotoImage on OS X
by Marc Culler Nov. 14, 2012

Nov. 14, 2012

This was reported here in February, but no debugging information was provided by the reporter: http://stackoverflow.com/questions/9142786/python-imagetk-photoimage-segfau… <view-source:http://stackoverflow.com/questions/9142786/python-imagetk-photo…> I can explain the nature of the problem, but I don't know how to fix it correctly. I am using the standard x86_64 Python 2.7.2 package from python.org and I have installed Active State Tcl/Tk 8.11. When I tried using easy_install to install PIL it would not load, claiming that _imaging.so did not exist. In fact, it existed but was only a thin i386 executable. So I compiled Imaging-1.1.7 with export CFLAGS='-arch i386 -arch x86_64' and export TCL_ROOT=/Library/Frameworks/Tcl.framework/Versions/8.5/Tcl I was then able to load the module. However, the following code produced a segfault: import Image import ImageTk import Tkinter W = Tkinter.Tk() Im = Image.open('test_image.jpg') x = ImageTk.PhotoImage(Im) The crash occurs in Tk_GetImageMasterData. More importantly, though, the crash was preceded by the following messages: objc[36554]: Class TKApplication is implemented in both /Library/Frameworks/Tk.framework/Versions/8.5/Tk and /System/Library/Frameworks/Tk.framework/Versions/8.5/Tk. One of the two will be used. Which one is undefined. objc[36554]: Class TKMenu is implemented in both /Library/Frameworks/Tk.framework/Versions/8.5/Tk and /System/Library/Frameworks/Tk.framework/Versions/8.5/Tk. One of the two will be used. Which one is undefined. objc[36554]: Class TKContentView is implemented in both /Library/Frameworks/Tk.framework/Versions/8.5/Tk and /System/Library/Frameworks/Tk.framework/Versions/8.5/Tk. One of the two will be used. Which one is undefined. objc[36554]: Class TKWindow is implemented in both /Library/Frameworks/Tk.framework/Versions/8.5/Tk and /System/Library/Frameworks/Tk.framework/Versions/8.5/Tk. One of the two will be used. Which one is undefined. Guessing that PIL was finding the System/Library/Frameworks/Tk.Framework instead of /Library/Frameworks/Tk.Framework, I tried hiding the system Tcl and Tk frameworks by renaming them. I was then able to create the PhotoImage and display it. I don't know where those messages come from, and I have never encountered them before. But I am guessing they are from OS X, since they are generated by an objective C program. Evidently _tkinter.so is able to specify which Tk.Framework to use. I don't know its mechanism for doing that. But, somehow, PIL is not doing it, and it ends up using the wrong one. A stack trace of the crash is below. - Marc 0x000000011517bccd in Tk_GetImageMasterData () (gdb) bt #0 0x000000011517bccd in Tk_GetImageMasterData () #1 0x0000000115183d9f in Tk_FindPhoto () #2 0x00000001014fbadc in PyImagingPhotoPut () #3 0x000000011502a05b in TclInvokeStringCommand () #4 0x000000010102142a in TclEvalObjvInternal () #5 0x000000010102261c in Tcl_EvalObjv () #6 0x000000010100646d in Tkapp_Call () #7 0x00000001000c102d in PyEval_EvalFrameEx () #8 0x00000001000c2d29 in PyEval_EvalCodeEx () #9 0x00000001000c0b6a in PyEval_EvalFrameEx () #10 0x00000001000c2d29 in PyEval_EvalCodeEx () #11 0x000000010003da80 in function_call () #12 0x000000010000c5e2 in PyObject_Call () #13 0x000000010001ebcb in instancemethod_call () #14 0x000000010000c5e2 in PyObject_Call () #15 0x00000001000ba5f7 in PyEval_CallObjectWithKeywords () #16 0x0000000100021e5e in PyInstance_New () #17 0x000000010000c5e2 in PyObject_Call () #18 0x00000001000be5f3 in PyEval_EvalFrameEx () #19 0x00000001000c2d29 in PyEval_EvalCodeEx () #20 0x00000001000c2e46 in PyEval_EvalCode () #21 0x00000001000e769c in PyRun_InteractiveOneFlags () #22 0x00000001000e78fe in PyRun_InteractiveLoopFlags () #23 0x00000001000e80e1 in PyRun_AnyFileExFlags () #24 0x00000001000fe77c in Py_Main () #25 0x0000000100000f14 in dyld_stub_strlen ()

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ttk.Notebook - how to bind to tab events (tab caption has focus or mouseover)
by python＠bdurham.com May 9, 2012

May 9, 2012

I'm using the ttk.Notebook widget. What object do I bind to capture events related to specific tabs? I would like to trap when a tab caption gets keyboard focus ('<FocusIn>') and when the mouse pointer is over a specific tab caption ('<Enter>'). I can trap mouse clicks on tabs (<Button-1>, <Button-3>), but I can't find a way to determine what tab a user clicked on in the case of a right click. Thank you, Malcolm

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Serializing tkinter objects
by willie.lawrence April 24, 2012

April 24, 2012

Hello everybody, I'm a new user of this List. OBS: forgive my english (I'm a brazilian student) My question: I want save PhotoImage (Tkinter.PhotoImage or/and PIL.tkImage.PhotoImage) objects, but Tkinter classes cannot be serialized, so I thought in get all pixels and serialize this tuple, when in starting of my program post all pixels. The problem is that is a harmful practice to velocity...Look, load a wallpaper of 1600x1200 pixels... I also try encode the content of file: # ----------- toEncoder.py ----------- import base64 as b64, shelve gifFile = open("image.gif", "wb") # loading the gif image content = gifFile.read() shelveDB = shelve.open("SimpleDb.db") # where I will save shelveDB["myGIF"] = b64.b64encode(content) shelveDB.close() gifFile.close() # ----------- EOF ----------- # ----------- reader.py ----------- from Tkinter import * import shelve db = shelve.open("SimpleDB.db") content = db["myGIF"] top = Tk() img = PhotoImage() img.configure(data=content) testLabel = Label(top, text="test", compound="left", image=img) testLabel.image = img testLabel.grid() db.close() top.mainloop() # ----------- EOF ----------- But, how you can see, I can do it only with GIF Images (using Tkinter.PhotoImage) Anyway, any help is welcome! -- View this message in context: http://python.6.n6.nabble.com/Serializing-tkinter-objects-tp4902671p4902671… Sent from the Python - tkinter-discuss mailing list archive at Nabble.com.

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Python 3.2 and binding Mousewheel on Mac
by Michael O'Donnell April 22, 2012

April 22, 2012

Hi All, I am on Macosx Lion running Python 3.2.3 and Tkinter 8.5 The following code breaks on my machine, and given search on the web, has been breaking in different forms since 2005. #======== from tkinter import * def _onMouseWheel(event): print(event) root = Tk() root.bind('<MouseWheel>',_onMouseWheel) root.mainloop() #======= On my machine works under python 2.7.2. I thought this would be fixed by now. Does anyone know anything about it? Mick

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problem changing font settings for ttk themed widgets on Windows
by Lynn Oliver April 20, 2012

April 20, 2012

On OS X, ttk.Style().configure('TLabelframe.label', font='helvetica 14 bold') works to change the font used by the ttk.LabelFrame widget. On Windows, ttk.Style().configure('TLabelframe.label', font='arial 14 bold') has no effect other than causing ttk.Style().lookup('TLabelframe.label','font' to return the changed font info. ttkButton and ttk.CheckButton also do not allow the font to be changed on Windows. ttk.Label does allow the font to change. I tried creating a derived style but that doesn't work either. Changing the font setting in python27/tcl/tk8.5/ttk/xpTheme.tcl does change the font being displayed. Removing the -font TkDefaultFont setting from the theme settings does not change what is displayed or allow the font to be changed. Any suggestions as to how this actually works?

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Tkinter GUI freezing
by Bharath Reddy A. April 20, 2012

April 20, 2012

Hi all, I have created a GUI using Tkinter. I have a button "GO", which when clicked calls a function (mainFunc). That function takes around 60 seconds to execute and in the mean time outputs many numbers which have to be displayed in a list in the GUI. I have attempted the following: 1. I created a thread whose target = mainFunc, when the button is clicked. I can see the function printing stuff in terminal. But the GUI still freezes. 2. When I tried to create a thread whose target = root.mainloop(), the GUI doesn't display at all, (Python.app launches but the GUI is not displayed), *Can you please help me how to create threads exactly???* I am attaching my code along with the mail main. mainFunction() is the function that takes approx 60 seconds to execute and that should be running in parallel with GUI/ in background. Thanks in advance...

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Glade for Tkinter?
by Monte Milanuk April 14, 2012

April 14, 2012

Has anyone ever considered such a beast? Seems like Glade continues to be popular, and it appears possible to utilize it for other gui packages like wxpython (e.g. wxGlade)... Its far beyond my current (mostly nonexistent) abilities since I'm just a beginner, so you can skip the 'great idea, go for it!' bit ;) It just occurred to me that it might make a good idea for a summer of code project or something like that. Monte

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TkPhotoImage data-option
by shoz April 13, 2012

April 13, 2012

Hello, Developers I modified Tkinter on Python 2.7 and use it every time. Because original Tkinter dosen't execute the following code well: f = open("apple.ppm", "rb") pho = Tk.PhotoImage(data=f.read()) I found out what is wrong in Tkinter implement and fixed it. That is: *** org/_tkinter.c --- new/_tkinter.c *************** *** 947,954 **** Tcl_Obj *result; if (PyString_Check(value)) ! return Tcl_NewStringObj(PyString_AS_STRING(value), PyString_GET_SIZE(value)); else if (PyBool_Check(value)) return Tcl_NewBooleanObj(PyObject_IsTrue(value)); else if (PyInt_Check(value)) --- 947,954 ---- Tcl_Obj *result; if (PyString_Check(value)) ! return Tcl_NewByteArrayObj(PyString_AS_STRING(value), PyString_GET_SIZE(value)); else if (PyBool_Check(value)) return Tcl_NewBooleanObj(PyObject_IsTrue(value)); else if (PyInt_Check(value)) The reason seems that Tcl_NewStringObj() expects UTF-8 string as input but PyString_AS_STRING() returns ascii string. Dose anyone verify whether my fixed code is correct or not. Best regards. Shozo

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Questions about treeview
by Bill Felton April 12, 2012

April 12, 2012

Hi all, Is it true that the ttk treeview widget 'swallows' right-mouse clicks? We have a need that could be met with the treeview if we could only figure out how to get pop-up menus to work in that widget. Our tests seem to show that regardless of where in the containment structure one binds <button-2> (widget, frmae, outframe, window, app), if the widget at the "bottom" of the stack is a treeview, the mouse button-2 event will not be caught. Also, are there plans to fix the current problems with horizontal scrolling in treeviews? We have used the work-around of having an empty data column that the user can drag to the right; once the drag moves past the visible bounds of the frame containing the treeview the horizontal scrollbar appears. This seems clumsy and un-intuitive, so we're hoping there's another, better, way to get horizontal scrolling to work. regards, Bill

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