Mailman 3 - Tkinter-discuss

Copy image to clipboard
by Vasilis Vlachoudis March 1, 2024

March 1, 2024

Dear all, I am trying in X11 to copy an image to clipboard but with out success. here the code that I am using up to now # image is a PIL image image_buffer = io.BytesIO() image.save(image_buffer, format="PNG") image_buffer.seek(0) window.clipboard_clear() window.clipboard_append(image_buffer.read(), type="image/png", format="image/png") I've tried to call cipboard_append with image_buffer, image_buffer.getbuffer(), image_buffer.read(), even save the data ina global variable to avoid being GC. It always append too few data -> invalid image Any ideas?

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How to center tkDialog
by Vasilis Vlachoudis Jan. 10, 2024

Jan. 10, 2024

Hi all, when using the tkDialogs.Dialog(), it always appears centered in the screen and not as on-top/transient of the master window. In contrast with the other dialogs it doesn't seem to respect the parent= any ideas on how to center it? Vasilis

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Navigation in menu with multiple columns
by Vasilis Vlachoudis Sept. 25, 2023

Sept. 25, 2023

In my application I am dynamically creating cascading menus, where some of them have multiple entries. To imrpove the visualization I break them into multiple columns using the "columnbreak=1" attribute in the Menu.add_command() The Up/Down keys move correctly the active/highlighted entry up/down However the Left key closes always the cascade submenu, while I would prefer to highlight the entry on the left column, and when it is on the left-most column to close the cascade submenu Is there a way to bind the Left/Right keys to move left/right in the columns? Vasilis

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Canvas() to Image() fonts
by Bob Greschke July 29, 2023

July 29, 2023

Hi! I'm plotting some stuff to a Canvas() (second-by-second signal-to-noise values for GPS satellites) and using something like PROGPropFont = Font(font = Entry()["font"]) in the program to get the font to use for text labels and stuff on the canvas. I can't figure out how to get the same font for the an Image (so I can duplicate the Canvas and save it as a png, of course). Without specifying anything the text used on the image looks something like Courier. Thanks! Bob A little program info is at www.greschke.com/passcal/software/gpsview.html

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Treeview: stop temporarily TreeviewSelect messages
by Vasilis Vlachoudis May 31, 2023

May 31, 2023

Hi all, during the filling of a ttk.Treeview, widget I want to temporarily disable the <<TreeviewSelect>> (to restore the previously selected items), and re-enable it at the end. However, when I unbind the <<TreeviewSelect>> event the messages are still send. See the following demo code. I would expect that during the filling no <<TreeviewSelect>> message will be send, however I get hundreds of messages at the end import tkinter as tk from tkinter import ttk def tvselect(event): print("SELECTION CHANGED") def fill(event=None): t.unbind("<<TreeviewSelect>>") for i in range(1000): item = t.insert("",tk.END,text=f"Item {i}") if i&1==0: t.selection_add(item) t.bind("<<TreeviewSelect>>", tvselect) if __name__ == "__main__": root = tk.Tk() t = ttk.Treeview(root) t.bind("<<TreeviewSelect>>", tvselect) t.pack(expand=tk.YES,fill=tk.BOTH) b = tk.Button(root, text="Press me", command=fill) b.pack() root.mainloop()

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Maybe a bug about tk.Text and tk.Label
by 张小平 May 8, 2023

May 8, 2023

When i use Text or Label to show this : [ [1,"PAGE",{"id":"w"}], [2,"Text",{"caption":"This is first GUI Page，totally different form HTML."}] ] It shows this: {1 PAGE {{'id': 'w'}}} {2 Text {{'caption': 'This is first GUI Page，totally different form HTML.'}}} Have you met this? Why? Is it a bug about Text or Label? All code: https://gitee.com/zhaoyun004/my-gui-browser/tree/master/Will python b.by ， then input "source" and Enter to see the source code. I write these to try to create a Python Browser, not use HTML, but Python List , Dict format.

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Get menu index from label
by Alan Gauld April 14, 2023

April 14, 2023

I'm trying to extract a menu entry's index given the entry label. ie for the typical File... menu, with entries of: New, Open, Save, Save As, etc... How do I get the index of the entry labelled "Save As", given I have a reference to the containing menu object? Once I have an index I can do various things to the entry but there seems to be no way to access the entry without an index and no way to get the index (other than counting manually, which is no good where the menu content changes dynamically) based on the label. The top level requirement is to toggle the label between two values when certain state changes occur. (I could use a checkbox menuitem but those are not common UI elements and might confuse some users.) [ Another solution would be to get the list of items in the menu, but I can't see how to do that either (which seems odd!) With that list I could loop to find the item/index. ] -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos

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Running from a cron job?
by Bob Greschke April 14, 2023

April 14, 2023

Hi! I'm writing a tkinter utility, more than a program, that starts, looks at some data files, looks at some image files, then plots the data from the file(s) that do not have a corresponding image file, does an ImageGrab.grab() of the Canvas and saves the image with the rest of the previously saved images. Will that work with no Desktop? There won't be any $DISPLAY, I think. I generally won't be logged in if I don't have to. It's on a kind of a server sitting in the corner collecting the data files and dust. It's running Ubuntu Desktop. If I run it from a logged in GUI terminal thing then it, of course, runs fine. I could have the server auto log in (on a boot/reboot) and then there would be a Desktop on the normally turned off monitor. The cron job would be set up from the same account. Thanks! Bob

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Pack labels
by AI 7 Jan. 16, 2023

Jan. 16, 2023

Hi, I am creating a booking system where one of the functions is to retrieve bookings from a text file and display to the user. The text file stores each booking on a new line with all its fields. A loop is made through the array when the text file is read and each line (each index of the array) creates a label with the text being the line and packs this label. When there are many records stored in the text file, as many labels are created which then go below the screen and are unreadable. There is no scroll bar to view the labels below the screen or the ability to zoom out. Can anyone guide me on how to fix this?

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Slow tk applications...
by Vasilis Vlachoudis Nov. 20, 2022

Nov. 20, 2022

Hi all, in the past months I've noticed a considerable slow-down on drawing of the TK applications on the latest Ubuntu. The slow-down is very noticeable during the initial phase of creating the windows and when the application exits. It takes a couple of seconds to create one by one all widgets on the screen, as well when I call close on the main window, the widgets disapear one by one very slowly (several seconds). Like working over a remote connection. However once the widgets are created the application is very responsive. Did anyone experience something similar? Is it the python version or tk version? Graphics library Any ideas on how to debug it? cheers Vasilis

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