Mailman 3 February 2018 - Tkinter-discuss

clipboard and bytes
by Vasilis Vlachoudis March 2, 2018

March 2, 2018

Hi all, I took the decision to convert my program to python3. I am stuck with the clipboard handling str vs bytes How can I get/receive bytes instead of str with the clipboard? What I was doing up to now was opening a StringIO stream dump a header and the objects as a dump from Pickler Up to now in python V2. it was working like this Copy to clilpboard: target1 = "<flair:card>" sio = io.StringIO() sio.write(target1) pickler = Pickler(sio) pickler.dump(....) root.clipboard._clear() root.clipboard_append(sio.getvalue()) Paste from clipboard: clip = root.clipboard_get(selection='CLIPBOARD') if clip.startswith(target1): pickler = Unpickler(io.StringIO(clipboard[len(target1):])) ... elif... In python3 Pickler requires a byte stream so I replaced all StringIO() to BytesIO() and the targets with bytes target1 = b"<flair:card>" Copying to clipboard work ok (or I believe so) Pasting, clipboard_get() returns a str not bytes and the Unpickler fails. Also If I try to encode("UTF-8") the clip data also it fails. Thanks in advance Vasilis

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multicolumn list/tree with images
by c.buhtz＠posteo.jp Feb. 18, 2018

Feb. 18, 2018

I experimented with tkinter.ttk.Treeview and tkinter.Listbox on Python3. I need a list widget with multiple columns (this could be Treeview). But I need images as values. I don't want to use column '#0' for images. Images should appear in the second column for example. Tk itself has a treectrl. Maybe it is possible with it? But I don't know how to use this with Python3. Maybe there are other third party solutions around?

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listdir
by Vasilis Vlachoudis Feb. 16, 2018

Feb. 16, 2018

Hi all, I know that it it is not related to tkinter, but I had troubles in submitting in the general python list. I was trying to make my custom FileDialog to handle unicode filenames and I stuck with the following behavior (python v2.7) #path = "/home/bnv/Download" path = u"/home/bnv/Download" for fn in os.listdir(path): print(fn,type(fn)) fullpath = os.path.join(path, fn) If the "path" is defined as unicode I get the following output and error (u'foo.py', <type 'unicode'>) ('Gewu\xccrzhalter.Part1.nc', <type 'str'>) Traceback (most recent call last): File "foo.py", line 20, in <module> filename = os.path.join(path, fn) File "/usr/lib/python2.7/posixpath.py", line 73, in join path += '/' + b UnicodeDecodeError: 'ascii' codec can't decode byte 0xcc in position 5: ordinal not in range(128) While if the "path" is defined as str. I get ('foo.py', <type 'str'>) ('Gewu\xccrzhalter.Part1.nc', <type 'str'>) I don't understand why if the path is unicode the output of listdir is unicode the filenames containing only ascii and str for the file with the non-ascii character. While if the path is str, all output is in str Thanks in advance Vasilis

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Get height of a row in Treeview in Tkinter with Python3
by c.buhtz＠posteo.jp Feb. 15, 2018

Feb. 15, 2018

X-Post: https://stackoverflow.com/q/48736168/4865723 I want to know how height (in pixel) is a row in a tkinter.Treeview. I know how I can manipulate the height (see example below) with the styling mechanism. But I want to read it first - because it depends on the operating system, fonts, etc. And I couldn't find something in the style object I could read for this. My goal is to modify the rowheight with a relative factor. e.g. 1,5 of the original height. #!/usr/bin/env python3 from tkinter import * from tkinter import ttk if __name__ == '__main__': root = Tk() style = ttk.Style() # here I set the `rowheight` style.configure('MyTreeView.Treeview', rowheight=45) tree = ttk.Treeview(root, style='MyTreeView.Treeview') tree.pack() for i in range(5): tree.insert(parent='', index=END, text='item {}'.format(i)) root.mainloop()

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Re: [Tkinter-discuss] multicolumn list/tree with images
by c.buhtz＠posteo.jp Feb. 15, 2018

Feb. 15, 2018

On 2018-02-14 01:14 <c.buhtz(a)posteo.jp> wrote: > But I need images as values. I don't want to use column '#0' for > images. Images should appear in the second column for example. A workaround would be to keep the '#0' column with the image. But I need to remove the tree space (some pixel on the left of the picture) because I don't need a tree. But show='headings' would remove the complete '#0' column with the image. I need an image in each list row as small button. The user can use this as a flag to mark some rows.

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Listbox size
by Bob van der Poel Feb. 15, 2018

Feb. 15, 2018

Is there a way to get the current height (hopefully in lines) of a listbox? I'd like to center, vertically, the result of a search. -- **** Listen to my FREE CD at http://www.mellowood.ca/music/cedars **** Bob van der Poel ** Wynndel, British Columbia, CANADA ** EMAIL: bob(a)mellowood.ca WWW: http://www.mellowood.ca

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Contribution to Tkinter's Documentation
by adil gourinda Feb. 5, 2018

Feb. 5, 2018

Hi Because the official Tkinter's documentation is not complete I have to learn Tcl/Tk language,learning a new language and translate its syntax take a great efforts. So to make things easier for Python's users ,I made this project "Tcl/Tk--|direct translation|-->Tkinter"(https://wiki.tcl.tk/49306) and as I said in my project's description: "My objective is to make a direct translation from Tcl/Tk to Tkinter...". The work is not yet complete but I want the Python's community to benefit from it and participate in its developpement(I can share with you the translation's rules, they are my inventions :-) ) Honestly I feel comfort in Tcl/Tk wiki except some limitations: -to change the name of a page you can't do it directly you have to create new page with new title -problem in indented text And it was also an opportunity to discover "Tcl" language(It is not bad). Thanks for your attention. Gourinda Adil

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Buttons: Order of execution
by John Sampson Feb. 4, 2018

Feb. 4, 2018

I have a method in in which I have the line: self.greenButton.configure(text="Loading",state="disabled", background="green") followed by other lines. Being a complete newbie, I would expect the green button to start showing the text "Loading" before execution of the lines following the abovementioned line. But it does so immediately afterwards. I am not looking for a direct solution, but this shows that I do not understand how to write tkinter code involving buttons. Is there a simple explanation how to go about writing code so as to make things happen, either at all, or when I want them to happen? Regards John Sampson

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Simulating keystrokes in a tkinter unit test
by alan moore Feb. 2, 2018

Feb. 2, 2018

Hi all, I'm attempting to write a unit test for a custom widget using Python unittest. I'm trying to simulate actual keystrokes in my unit test. Following the example from the tkinter test suite, I created a test that is approximately this: from tkinter import Entry as MyWidget from tkinter.test.support import AbstractTkTest import unittest class TestMyWidget(AbstractTkTest, unittest.TestCase): def setUp(self): super().setUp() self.mywidget = self.create() self.mywidget.wait_visibility() def tearDown(self): super().tearDown() self.mywidget.destroy() def create(self): mw = MyWidget(self.root) mw.pack() return mw def _keystroke(self, char): self.mywidget.event_generate('<KeyPress-{}>'.format(char)) self.mywidget.event_generate('<KeyRelease-{}>'.format(char)) self.mywidget.update_idletasks() def test_key_entry(self): self._keystroke('a') self.assertEqual(self.mywidget.get(), 'a') if __name__ == '__main__': unittest.main() This doesn't work, though. The keypresses don't register and create any text in the entry. I can add text using event_generate inside a mainloop, but without mainloop it doesn't seem to work. Interestingly, I can use the same method to generate mouse events and they seem to be recognized. Is there a way to make keypresses work without mainloop?

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