Mailman 3 July 2013 - 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

6 9

tkFileDialog
by Paul Malherbe Aug. 16, 2013

Aug. 16, 2013

HI I have a question regarding tkFileDialog. Is there any way I can create the dialog with customised dimensions as the default is very small? Regards Paul Malherbe

2 3

Re: [Tkinter-discuss] python: Display the text on tk window.
by Michael Lange July 30, 2013

July 30, 2013

On Tue, 30 Jul 2013 14:29:41 +0530 Srinivas Rao <srinivas.rambha(a)gmail.com> wrote: > Hello sir, i changed my code from text widget to label widget. But i am > facing a small issue here. I could not delete the previous content from > the window. I know how to delete and insert with text widget, but i > don't know how to acheive this using label widget. please help me . > > thank you > Hi Srinivas, if you need further assistance with Tkinter, please send no more personal messages to me but write to the tkinter-discuss list instead, as you did initially, so others too can benefit from the answers by reading the list archives. There is also a benefit for you, because the list is read by other, presumably more capable Tkinter experts than me. Writing to the list does not mean additional delay for you - each time my mail client checks for new mail, it receives anything sent to the list also ;) Thank you. As for your question: did you have a look at the online Tkinter reference books to which I sent you links in a previous message? I guess you did not, because you would have easily found e.g. at http://effbot.org/tkinterbook/label.htm that with a label widget you do not "delete" the old text, but simply replace the old text string with a new one by doing label.configure(text='newtext') resp. update the value of an associated textvariable. Frankly speaking, I and anyone else at tkinter-discuss are always glad if we can help, but a little more efforts from your side on solving a particular problem before asking us would be greatly appreciated. Please keep in mind that we all are volunteers who do this in our spare time. Thank you again for your understanding and best regards Michael .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. "What terrible way to die." "There are no good ways." -- Sulu and Kirk, "That Which Survives", stardate unknown

1 0

Re: [Tkinter-discuss] python: Display the text on tk window.
by Michael Lange July 19, 2013

July 19, 2013

On Fri, 19 Jul 2013 14:42:46 +0530 Srinivas Rao <srinivas.rambha(a)gmail.com> wrote: > I tried to write my code using label widget, but the options are > different comparing to text widget. > I tried but couldn't succeed. > for example: It wraps the text to WORD or CHAR by itself in text > widget. But in label, The default value is 0, means that lines will be > broken only at newlines. so please help me to convert my code from TEXT > to LABEL. If possible please show me how to write my code using LABEL > widget. thank you > with regards, > srinivas The Label widget has a wraplength option, which determines the maximum length of a line before it is being wrapped. If you want to learn more about widget options you might want to have a look at John Shipman's excellent and up to date Tkinter reference: http://infohost.nmt.edu/tcc/help/pubs/tkinter/web/index.html There is also Frederick Lundh's Tkinter book (still work in progress but nevertheles an invaluable source): http://effbot.org/tkinterbook/tkinter-index.htm Regards Michael .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. ... bacteriological warfare ... hard to believe we were once foolish enough to play around with that. -- McCoy, "The Omega Glory", stardate unknown

1 0

Re: [Tkinter-discuss] python: Display the text on tk window.
by Michael Lange July 18, 2013

July 18, 2013

On Thu, 18 Jul 2013 17:50:47 +0530 Srinivas Rao <srinivas.rambha(a)gmail.com> wrote: > its working sir, thanks a lot. > > I had 1 more issues. > Is it possible to print this received text at the middle of the tk > window irrespective of the data si. > > My question is @ > The receiver don't know the size of the receving data, but in my > project i am sure that maximum 7 lines of data will receive. > The font i choose is 37 in my code.with this font size i can print 9 > lines on the TK window. if i receive 1 line of data,this data should > print on 5th line, by leaving equal amount of space at top and bottom > of the window.Again i may receive 3 line of serial data, this data > should print from 4th to 6th line of the window by leaving equal space > on top and bottom.Again if i receive 6 lines of serial data, this > should print from 2nd line to 7th line on the window. Irrespective of > data size which is receiving, data should print on window by leaving > equal amount of spaces at top and bottom of the window. This display > will make a good impression to see on the window. If you only want to display a limited amount of text and not edit this text, maybe the Label widget would suit you better and the kind of centered text you describe is the Label's default behavior. Regards Michael .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. Immortality consists largely of boredom. -- Zefrem Cochrane, "Metamorphosis", stardate 3219.8

1 0

Re: [Tkinter-discuss] python: Display the text on tk window.
by Michael Lange July 18, 2013

July 18, 2013

On Thu, 18 Jul 2013 16:39:37 +0530 Srinivas Rao <srinivas.rambha(a)gmail.com> wrote: > i even tried this way, here the received data displaying on tk until it > receives other data from transmitter. but the main problem is: > when it receives a data of 3 or 4 lines, it only displaying the last > few charecters of the data. there is no problem for displaying single > line of data. but when the receiving data increases by size, the > complete received data is not displaying ans as i said before it only > displaying last few characters of the data on the tk window. If you tried my example from the last post: > > > > def process_serial(self): > > while self.queue.qsize(): > > try: > > new = self.queue.get() > > self.text.delete(1.0, 'end') > > self.text.insert('end', new) > > except Queue.Empty: > > pass > > self.after(1500, self.process_serial) > > > > which will empty the text only if new content is available (ok, this > > does not handle the case of multiple new items in the queue, but I > > guess you'll see the point...). then, as I said, it will of course only show the last element in the queue; to handle multiple queue items you might for example add a variable to process_serial() as in: def process_serial(self): firstitem = True while self.queue.qsize(): try: new = self.queue.get() if firstitem: self.text.delete(1.0, 'end') firstitem = False self.text.insert('end', new) except Queue.Empty: pass self.after(1500, self.process_serial) Regards Michael P.S.: please reply to the list next time, don't worry, I'm subscribed ;) .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. Time is fluid ... like a river with currents, eddies, backwash. -- Spock, "The City on the Edge of Forever", stardate 3134.0

1 0

Re: [Tkinter-discuss] python: Display the text on tk window.
by Michael Lange July 18, 2013

July 18, 2013

Hi, I forwarded this to the list (hope that's ok), I thought it might be of interest for other people, too. On Thu, 18 Jul 2013 13:07:41 +0530 Srinivas Rao <srinivas.rambha(a)gmail.com> wrote: > Two pc's are connected with RS 232 label for serial communication. one > pc for transmitting and other pc for receiving. > I will run this code in receiving pc. > This code is to receive text from a transmitting pc and display it on > tkinter window of the receiving pc. > The received text has to be displayed on tk window Until it receives > other text from transmiting pc. > But With my code the contents of the received text is displaying on tk > window for only few milliseconds, then after tk window looks plain > with no contents of data. When it receives another text from > transmitter, it again displays the text only for milliseconds and the > text vanishes. > > Here > The text is not a pre defined bunch of messages of equal lengh, the > length of the text vary all the time. > The time period between the text's is not constant, it also vary all > the time. > The transmitter sends text at differnet time periods,first text in 5 > min, next text may be in 10 min and the third text may be in 30 min and > so on. I don't want to clear the contents of the text from the tk > window until it receives next text from transmitter. > > The font size i choose is 37 and I dont need a scrool bar to scrool the > window, because transmitter sends maximum of 5 lines to display on > receiver tk widow. > import serial > import threading > import Queue > import Tkinter as tk > > > class SerialThread(threading.Thread): > def __init__(self, queue): > threading.Thread.__init__(self) > self.queue = queue > def run(self): > s = serial.Serial('COM11',9600) > > while True: > if s.inWaiting(): > text = s.readline(s.inWaiting()) > self.queue.put(text) > > class App(tk.Tk): > def __init__(self): > tk.Tk.__init__(self) > self.geometry("1360x750") > frameLabel = tk.Frame(self, padx=40, pady =40) > self.text = tk.Text(frameLabel, wrap='word', > font='TimesNewRoman 37', bg=self.cget('bg'), relief='flat') > frameLabel.pack() > self.text.pack() > self.queue = Queue.Queue() > thread = SerialThread(self.queue) > thread.start() > self.process_serial() > > def process_serial(self): > self.text.delete(1.0, 'end') > while self.queue.qsize(): > try: > self.text.insert('end', self.queue.get()) > except Queue.Empty: > pass > self.after(1500, self.process_serial) > > app = App() > app.mainloop() Of course the problem here is the call to self.text.delete() in process_serial() which forces the Text's contents to be deleted after 1500 ms in any case. What you probably intended is something like: def process_serial(self): while self.queue.qsize(): try: new = self.queue.get() self.text.delete(1.0, 'end') self.text.insert('end', new) except Queue.Empty: pass self.after(1500, self.process_serial) which will empty the text only if new content is available (ok, this does not handle the case of multiple new items in the queue, but I guess you'll see the point...). Regards Michael .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. What kind of love is that? Not to be loved; never to have shown love. -- Commissioner Nancy Hedford, "Metamorphosis", stardate 3219.8

1 0

Display the text on tkinter window
by Srinivas Rao July 17, 2013

July 17, 2013

Hello This is Srinivas, i am new to python and haven't got much experience in programming. I wrote a code to receive the data and display on tkinter window. Transmitter will keep on sending the data and receiver will receive the data and display on tkinter window, this can be done with my code. what i need to acheive here is, the received data should display on tk until the transmitter sends other data. with this code the received data is displaying on tk for just few milliseconds and tk window looks plain with no contents. suppose if transmitter transmits a data for every 5 minutes( approximately), the receiver will receive data and should display on tk for 5 min. seeking for help. thanks in advance. with regards, srinivas

2 1

Getting an Entry field to stretch
by Bob Greschke July 4, 2013

July 4, 2013

This is what I want to do...almost: ----- #! /usr/bin/env python from Tkinter import * Root = Tk() RowActiveVar = StringVar() LastWidth = 0 Count = 0 def iChanged(e = None): global LastWidth global Count Count += 1 Geom = Root.geometry() Width = int(Geom[:Geom.index("x")]) if Width == LastWidth: return # Root.geometry("%d%s"%((Width+ScrollWidth+2), Geom[Geom.index("x"):])) LastWidth = Width+ScrollWidth+2 return RowSub = Frame(Root, bg = "blue") RowCan = Canvas(RowSub, bg = "red") RowCan.pack(side = LEFT, expand = YES, fill = BOTH) Scroll = Scrollbar(RowSub, orient = VERTICAL, command = RowCan.yview, \ width = 15) Scroll.pack(side = RIGHT, fill = Y) ScrollWidth = int(Scroll.cget("width"))+int(Scroll.cget("bd"))*2+ \ int(Scroll.cget("highlightthickness"))*2 RowCan.configure(yscrollcommand = Scroll.set) RowSub.pack(side = TOP, expand = YES, fill = BOTH) Y = 0 for I in xrange(1, 20): SSub = Frame() LRb = Radiobutton(SSub, text = "", variable = RowActiveVar, \ value = str(I), bg = Frame().cget("bg")) LRb.pack(side = LEFT) LEnt = Entry(SSub, width = 15, bg = "white") LEnt.pack(side = LEFT) # This one... LEnt = Entry(SSub, width = 40, bg = "white") LEnt.pack(side = LEFT, expand = YES, fill = X) LEnt = Entry(SSub, width = 10, bg = "white") LEnt.pack(side = LEFT) SSub.pack(expand = YES, fill = X) RowCan.create_window(0, Y, anchor = "nw", window = SSub) RowCan.update() L,T,R,B = RowCan.bbox(ALL) Y = B RowCan.configure(scrollregion = (0, 0, R, B)) Geom = Root.geometry() LastWidth = R+ScrollWidth+2 Root.geometry("%d%s"%(LastWidth, Geom[Geom.index("x"):])) Root.bind("<Configure>", iChanged) Root.mainloop() ----- I'd like the center column of Entry fields to get longer as the window width is changed. I have a static non-scrollbar version of this that works fine (Entry fields in a Frame that is packed TOP into another Frame -- everyone set to expand and fill as needed), but throwing the Canvas and the scrolling in there seems to be a problem. I have another version that uses a Text() to hold all of the rows, but I can't get that to work either. The iChanged() stuff really doesn't do anything at this point. I was thinking that might be where a solution goes. Can it be done? Thanks! Bob

5 6