Mailman 3 March 2018 - Tkinter-discuss

real and platform independent maximizing a window
by c.buhtz＠posteo.jp March 30, 2018

March 30, 2018

When looking around about the question how to "maximize a window" with Tkinter there are two approaches. 1. Using wm_state('-zoomed', True). Problem: Not working on all platforms. e. g. "-zoomed" is not allowed on Debian unstable with XFCE on Python3.6 Tkinter 8.6 2. Compute the screen resolution or maxsize() and set it manually. This doesn't work also. The size doesn't fit exact and the "maximize" button on the top right corner is still available - should be transformed to a "normal size" button because the current state is "maximized". Isn't there a platform independent way to real(!) maximize a window with Tkinter? If not is there a ticket in the bug tracker about it?

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How to eliminate flickers when swapping frames?
by Nam Nguyen March 28, 2018

March 28, 2018

Hi list, I have several ttk.Frames belonging to the same parent (master, but I try not to use that word) that are swapped in and out depending on some external event. What I observe so far is there is some flickering every time a frame is swapped out and another swapped in. I have tried using both place and pack geometry managers. Do you have any tip/trick to eliminate this flickering? Thanks! Nam

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Revisiting the adage of GUI thread
by Nam Nguyen March 27, 2018

March 27, 2018

Hi, The adage often goes something like this: Do all GUI actions in a GUI thread (usually main thread), do I/O in different threads. While it is a good wisdom to apply blanketly, I'm curious about bad outcome from not following that advice. Other than the obvious blocking nature of the event loop, which is why we need threads to work with it, is there any other downside from directly creating, modifying, or destroying Tk objects (such as widgets, variables) in non-GUI threads? Thanks! Nam

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Inherit styles from parent widgets
by Nam Nguyen March 15, 2018

March 15, 2018

Hi list, Is there any way to inherit common options from parent widgets? Tk Themed widgets allow me to define a hierarchy of styles on different types of widgets. For example, I can have TButton, or Derived.TButton. What I'm asking is if I have a frame with red background color, I would love for all frames (or button, or any widget making use of the background option) placed in that frame to also inherit its redness unless a style has been specified. I guess (but am not sure) that this is similar to Cascade Style Sheet. Thanks! Nam

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Fixed ratio split screen geometry manager
by Nam Nguyen March 11, 2018

March 11, 2018

Hi, I'm looking for a fixed ratio 2-pane geometry manager. I tried PanedWindow but it does not have any option for me to specify the ratio of the children. What I'm looking for is a geometry manager/container that splits its space into two for the children. The children can grow only in their own spaces. The children can come and go, but the parent container should maintain that 2-pane split with the same ratio. Where should I look into? Thanks!

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configure command
by adil gourinda March 7, 2018

March 7, 2018

[cid:132f79be-dacf-4e7a-b0b1-94f5411d267b] By this picture I tried to explain the translation of "configure" command from Tcl to Python configure() method. For the (1) and (3) cases the python's syntax is clear. But for the (2) case where in Tcl I need to write only the option's name without value, what is its equivalent in Python (when the parameter's name is an argument)?; I tried the syntax in the picture and it works but what make things more difficult is when there is another parameter before "option" (ex :PanedWindow.paneconfigure). Thanks for your attention

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Fixed ratio split screen geometry manager
by Nam Nguyen March 7, 2018

March 7, 2018

Hi, I'm looking for a fixed ratio 2-pane geometry manager. I tried PanedWindow but it does not have any option for me to specify the ratio of the children. What I'm looking for is a geometry manager/container that splits its space into two for the children. The children can grow only in their own spaces. The children can come and go, but the parent container should maintain that 2-pane split with the same ratio. Where should I look into? Thanks! Nam

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Re: [Tkinter-discuss] PanedWindow widget
by mkiever＠web.de March 4, 2018

March 4, 2018

Just tried: Adding the function definition of sash_dragto to tkinter/__init__.py is sufficient to make it work. I just don't understand how it is supposed to be used in combination with sash_mark. Perhaps, I have to try this in tcl to understand. Serhiy Storchaka <storchaka(a)gmail.com>: >03.03.18 23:13, adil gourinda пише: > >> This output return the description of two Tcl commands (pathName *sash >> coord* index and pathName *sash dragto* index x y) in one Tkinter >> methods, is it an error? > >This looks like a bug. Please open an issue on https://bugs.python.org/.

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PanedWindow widget
by adil gourinda March 4, 2018

March 4, 2018

I) If you type in IDLE: ========== import tkinter print(help(tkinter.PanedWindow.paneconfigure)) ========== you get: ========== paneconfigure(self, tagOrId, cnf=None, **kw) ========== I have two questions: -Does "tagOrId" is the equivalent of "window" in TCL? -What is "cnf" parameter which is present in all Tkinter classes and methods? II) If you type in IDLE: ========== import tkinter print(help(tkinter.PanedWindow.sash_coord)) ========== you get: ========== sash_coord(self, index) Return the current x and y pair for the sash given by index. Index must be an integer between 0 and 1 less than the number of panes in the panedwindow. The coordinates given are those of the top left corner of the region containing the sash. + --------------------------------------------------------------- | pathName sash dragto index x y This command computes the | difference between the given coordinates and the coordinates | given to the last sash coord command for the given sash. It then | moves that sash the computed difference. The return value is the | empty string. + --------------------------------------------------------------- ========== This output return the description of two Tcl commands (pathName sash coord index and pathName sash dragto index x y) in one Tkinter methods, is it an error? Thanks for your attention

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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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