Mailman 3 December 2011 - 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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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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Hint text
by Charles Hixson Dec. 29, 2011

Dec. 29, 2011

Is there any way to show hints on mouseovers that doesn't require writing a separate function for each, e.g., Radiobutton? The only thing I've seen documentation say changes on mouseovers is the state, and the documentation says it will call the command whenever the state changes...but I don't see any way to tell what is having it's state changed except by having different commands for each selection. -- Charles Hixson

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Changing image data in ttk does not work
by Michael Lange Dec. 19, 2011

Dec. 19, 2011

Hi, I just noticed an odd behavior in ttk, when I try to change the image data of a ttk.Label's image, the image isn't actually updated. A simple code example: ######################################## from Tkinter import * import ttk icon1 = ('R0lGODlhEAAQAJEAANnZ2QAAAISEAP///yH5BAEAAAAALAAAAAAQABAAAAJ' 'WhI9pFB8RIIRC+BYQFqQQvkWEBSmEbyFhQQrhW0hYkEL4FhIWpBC+hYQFSYxvIgF' 'AoXy0AAiSGP8kAIIkxgcICSBEQvEBQgIIkVB8gJAAAhgfj+BjWgEAOw==') icon2 = ('R0lGODlhEAAQAKIAANnZ2QAAAP///4SEhP//AP///////////yH5BAEAAAA' 'ALAAAAAAQABAAAANZCLrcjqG7CLqBoquBoBuCoSqBoBsouhoIuiEYqrKBoIGiqwE' 'YEIChyxAIEYGgywEYgKHLDAgRCLozgwABARgIukSEABEBGLq8gAEQCLobgAEAgKH' 'LgaDLzZgAOw==') root = Tk() im = PhotoImage(data=icon1) Label(root, image=im, text='Tkinter', compound='left').pack( padx=100, pady=50) ttk.Label(root, image=im, text='ttk', compound='left').pack( padx=100, pady=50) current = 1 def swapimage(): global current if current == 1: im.configure(data=icon2) current = 2 else: im.configure(data=icon1) current = 1 root.after(1000, swapimage) root.after(1000, swapimage) root.mainloop() ######################################## When I run this code, the image in the Tkinter.Label changes every second, as expected, but the ttk.Label's image doesn't. Is this documented somewhere or is this a bug? Adding update_idletasks() or even update() to swapimage() does not help either. I know that I can change the image by doing ttklabel.configure(image=some_other_photoimage) but I thought changing the image data on the fly should work, too. Btw., the system is debian linux, tcl version is 8.5.8 . Regards Michael .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. We do not colonize. We conquer. We rule. There is no other way for us. -- Rojan, "By Any Other Name", stardate 4657.5

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Getting object Y pos in Canvas
by Martin B Dec. 18, 2011

Dec. 18, 2011

Hi all, For my little app i need know last Y coord of object i created on Canvas. I'm creating a text Object. For his last X coord i use font.measure('bla bla bla') this working.But i want know last Y coord coz i need create next text object bottom. How i get Y if i create this text object create_text(0, 0, anchor='nw', text='bla\n bla\n bla', font=boldfont) thanks

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Differences between two installations
by Lynn Oliver Dec. 7, 2011

Dec. 7, 2011

I've been using Python 2.7.2 with Tkinter.Tcl version 8.5.11, which I installed using the instructions here. Recently I did another installation using the instructions here in order to get SciPy to build correctly. The newer installation also shows as Python 2.7.2 and Tkinter.Tcl 8.5.11, but the same code does not work on both installs. I am on a Mac running OS X 10.7.2. On the earlier install, LabelFrame() keywords "bd" and "font" are recognized, while on the second install they are not. I can use "borderwidth" instead of "bd" on the second install. Also on the earlier install, LabelFrame(text="mylabel") displays the text imbedded in the frame. On the second install, the text is displayed outside of the frame. From the description here under the heading "Label Frames", I see that is the expected behavior, but it is different on the earlier install. The biggest problem is not being able to use named fonts on the second install, but the differences in how LabelFrame works also causes some platform-specific issues. On both builds, Tkinter.__version__ returns $Revision$. Any ideas as to what is going on? -Lynn

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why tkinter hangs on windows with tcl server socket?
by Bryan Oakley Dec. 6, 2011

Dec. 6, 2011

I’m running the following program on Windows, and when I close the app by clicking on the window manage close button the app hangs. Obviously this isn’t my real code, but I can’t explain why the code is hanging, or what the workaround is to get it to not hang. Interestingly, the last line of code is executing, so the main loop is terminating but the python process refuses to die – I’m having to kill it via the task manager. Even explicitly calling sys.exit() has no effect. Notice how I create a server socket, then immediately close the socket. No client is connecting to the server. It doesn’t matter that I close it or not, or if I close it after some period of time, it is the creation of the socket that seems to cause tkinter to hang. Any ideas? This is with python 2.7.2.5 from ActiveState, FWIW. # --- the code --- import Tkinter as tk root = tk.Tk() root.eval(''' proc Server {args} {puts "Server... $args"} set ::the_socket [socket -server Server 0] close $::the_socket ''') root.mainloop() print "mainloop has exited" # --- end of the code ---

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Syntactic problems
by Francisco Gracia Dec. 4, 2011

Dec. 4, 2011

Many thanks to you both, Kevin and Michael for your quick and sensible responses. My problems are more in the line suggested by Michael, although his hint has not solved them, at least as I have tried to implement it. In order for you to have all the information together, I transcribe the original Tcl code and my *porting* of it to *tkinter*. I commented it for my own use, in the process of conjecturing and confirming what the original code was intended to perform. If you run the original code with *tclsh* or *wish* and then my code with *Idle*, you will see very clearly where the problem lies. Kind regards Francisco # original Tcl code # offered as example in the *font manual page* of TkDocs. # Runs without problems with *tclsh* and *wish* # pack [text .t -wrap none] -fill both -expand 1 # set count 0 # set tabwidth 0 # foreach family [lsort -dictionary [font families]] { # .t tag configure f[incr count] -font [list $family 10] # .t insert end ${family}:\t {} \ # "This is a simple sampler\n" f$count # set w [font measure [.t cget -font] ${family}:] # if {$w+5 > $tabwidth} { # set tabwidth [expr {$w+5}] # .t configure -tabs $tabwidth # } # } from tkinter import * from tkinter import font # creation of the main window master = Tk() # creation of a text widget tw = Text( master ) tw.config( wrap = NONE ) tw.pack( fill = BOTH, expand = 1 ) tw.insert( END, "Display of available fonts:\n\n" ) count = 0 tabwidth = 0 # identification of the font being used f1 = tw.cget( 'font' ) # a measurement function used later # is a method of class *tkinter.font.Font*, # so that it is good to have the required instance of it fo = font.Font( font = ( f1, 10 ) ) # let us get the ordered list of all # available font families sampler = sorted( list( font.families() ) ) # handling and display of the elements for f in sampler : # the counter is updated count += 1 # display of the provided font name plus # a separator and a tabulator tw.insert( END, f + ":\t" ) # creation of an individual name for the tag # that will be applied to the sample for this item ftag = f + str( count ) # my (vain) efforts to solve the multiword problem if ' ' in f : # fm = "('" + f + "', '10')" # as for Michael's hint fm = '[list ' + f + ']' # fm = f.replace( ' ', '_' ) # fm = f.replace( ' ', '' ) tw.tag_config( ftag, font = ( fm, 10 ) ) # tw.tag_config( ftag, font = fm ) else : # single word names work as expected tw.tag_config( ftag, font = ( f, 10 ) ) # and the sample text: tw.insert( END, "This is a simple sampler\n", ftag ) # nice columnar disposition by # a clever configuration of the tabulator w = fo.measure( f + ':' ) if ( w + 5 ) > tabwidth : tabwidth = w + 5 # this equalizes all the lines as required tw.config( tabs = tabwidth ) if __name__ == '__main__' : master.mainloop()

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Syntactic problems
by Francisco Gracia Dec. 2, 2011

Dec. 2, 2011

I am exploring the possibilities of using *Tkinter* for a serious application mainly devoted to the handling of pure text. As en exercise I have tried to rewrite in *Python* an interesting example that is unusually included in the manual page of *Tk* for the *font* component (*Tcl8.5.7/Tk8.5.7 Documentation > TkCmd > font > example*); this code works fine under *tclsh* and *wish*. What is does is getting a list of the font names available in the machine in which it is running and displaying nicely each of its items with a sample of the corresponding font. I have performed most of my purpose and my *Python* script works. Along the way have learned a lot about *Tkinter/Tk/Tcl*, which was also a desired goal of the exercise. But the script does not work completely well, as I have also hit against an obstacle that I do not know how to overcome and seems to be rather deep. It is the following: Some of the names of the font families returned by the operating system (be it Windows or Linux) are composed of two or more words (like *Times New Roman CE*). Now these multiword arguments are not easily accepted by *Tcl/Tk*, especially if they are referenced by some variable, so that for instance tags cannot be reconfigured this way in order to apply such fonts; or the size of sentences using them cannot be measured, two operations that are essential for the procedure. I have learned that this is a real and inherent difficulty with *Tcl* (Harrison and McLennan, *Effective Tcl/Tk programming*: 34, 66); this is why the original code uses such a strange syntax like .t tag configure f[incr count] -font [list $family 10] The function *list* of *Tcl* seems to be mainly dedicated to solve this odd problem with the dereferencing of multiword contents of variables (*family* in this case, which holds the name of the font). But apparently this does not work when *Tcl/Tk* are finally moved by *Tkinter* during the execution of the script or at least I have been unable to find a way to make it work in due form. Which does not mean much, as I am not a programmer or, at most, I am a very unseasoned one. Can somebody who has had the same problem and solved it succesfully from *Tkinter* offer me (and perhaps us) his insight and describe the essentials of how to do it? Many thanks in advance!

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