Mailman 3 October 2010 - 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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entry+value assignment using function
by Alex Ter-Sarkissov Oct. 31, 2010

Oct. 31, 2010

hi, here's my situation: I create an Entry outside of a certai function*: self.newlab=Entry(root,state=DISABLED).grid(column=4,row=9)* the function acquires a value (from another Entry) and puts this value into the Entry created in the command above. The way I do it is def pop2pop(self,event): newpop=IntVar() newpop.set(self.PopSize.get()) #newpop=self.PopSize.get() self.newlab['textvariable']=newpop and it doens't work. Suprisingly, when I create the Entry within this function (e.g. self.newlab=Entry(root,textvariable=newpop).grid(column=4,row=9) it works. More over, the assignment of the value to newpop as (newpop=self.PopSize.get()) doesn't work either, so I have to use newpop.set(self.PopSize.get()) instead. what am I doing wrong? cheers, Alex

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How does Python's new ttk (Title) support work under Linux Qt and GTk?
by python＠bdurham.com Oct. 29, 2010

Oct. 29, 2010

Any comments on the concerns about ttk portability to Qt and GTk windowing systems? The following is from a recent thread on the python-list mailing list. > Tkinter is built-in and available on Windows, Mac, and Linux. If you're using Python 2.7 or 3.1 you can take advantage of Tkinter's ttk (Tile) support for platform native user interfaces. Reponse: You get a native UI using the correct theme even on Linux under Qt or GTk? >From what I've read of ttk, it still isn't using native UI elements. It just has a bunch of its own "themes" that look mostly/sort-of like native UI elements. Right? Under Linux does ttk automagically pick the theme that looks most like the current Qt or Gtk theme? On systems where both are installed, how does ttk decide whether to look like Qt or Gtk? In addition to looking like native UI elements, does ttk also change UI behaviors to match native UI elements? For example will it automatically use emacs key-bindings for text-entry editing if that's enabled in my Gtk configuration?

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Using Win32 API to get around Tkinter limitations?
by python＠bdurham.com Oct. 29, 2010

Oct. 29, 2010

Wondering if there are ways to use the Win32 API to get around the following Tkinter limitations? 1. Inability to set custom mouse cursors via *.cur/*.ani files. 2. Determine the height or width of window properties such as titlebar, left/right and bottom window frame edges? Thank you, Malcolm

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Cross platform way to discover the height/width of window borders/titlebar, etc.
by python＠bdurham.com Oct. 29, 2010

Oct. 29, 2010

Is there a cross-platform way to discover the height/width of operating system rendered window borders/titlebars, etc? If not, any suggestions on how one might discover these properties when running under Windows using either ctypes or the pywin32 library? Thank you, Malcolm

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Advanced Text example showing "rich text" like or syntax color coding markup?
by python＠bdurham.com Oct. 28, 2010

Oct. 28, 2010

I'm new to Tkinter development. We have a very simple markup language that we would like to "syntax color code" using Tkinter's Text widget. I'm looking for a simple code snippet, demo app, or high-level narrative description that explains how one might do this from one or more of the following perspectives: - initial markup during load - realtime markup while a user edits content (including clipboard pastes) - at file save time when one must walk the editted content To start the discusson, how might one do this with an example markup language with the following syntax? - any word beginning with '*' gets coded blue - any word beginning with '@' gets coded green - all other text has no formatting Thank you, Malcolm

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Cancel a window resize/move event trapped via <Configure>
by python＠bdurham.com Oct. 28, 2010

Oct. 28, 2010

Is it possible to cancel a window event, eg. if one wanted to constrain a window to a certain location on a user's desktop? Returning 'break' from a window's <Configure> event does not cancel window move or resize events. Thank you, Malcolm

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(no subject)
by Alex Ter-Sarkissov Oct. 27, 2010

Oct. 27, 2010

hi, here's my problem: let's say I have a function that uses some widget's property. How canI retireve the value of this property? For example, PopSize=IntVar(); popsize=Entry(root,width=10,textvariable=PopSize) def rand_opo_gen (self,event): popsize_start=#need to get the textvariable value from Entry popsize, not variable PopSize! pop1=random.random(popsize_start*2) Another option, of course, is that the variable PopSize acquires the value from Entry, but I can't see how to do it either cheers, alex

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Tkinter issues with Scrollbar and custom widget list
by Robert A. Lerche Oct. 27, 2010

Oct. 27, 2010

I am trying to create a scrolled list built from a custom widget -- similar to a listbox but with multiple entry fields per line (in the real application, there are validation routines associated with each entry field). The attached example demonstrates several problems, the most severe of which is a strange jerky behavior on Windows (not happening on Linux): gently dragging the scroll bar slider to a position where the 7th row (of 10) should be displayed at the top causes jumping between rows 6 and 8. Anybody seen something like this? Any suggestions? Thanks. ===== #! /usr/bin/python # (tested on Windows XP, with Python 2.7 and Tcl/Tk 8.5.2 built entirely # from sources; on Linux using Ubuntu 9.04 distributed packages -- Python # 2.6.2) # Example of a scrolled list bulit from a custom widget # # type1: an Entry field with a StringVar built-in # type2: another Entry field, without the built-in StringVar # frm: a Frame build from two type1's and one type2, with some Labels # testlist: a scrolling list of frm's # testcase: build a 3 high testlist with 10 frm's (scrollable) # Issues: # # 1. Moving the slider slightly gives jerky motion due to # redisplaying. To reduce this I check for a small "moveto" # that doesn't change the displayed row and only set the # scrollbar (slider) without redisplaying the list elements. # # 2. on Linux, moving the slider on the scroll bar to the top # sometimes gives a negative "moveto", which I force to 0, or a # "moveto" greater than 1.0, which I force to 1.0. This # doesn't happen on Windows. # # 3. on Windows, using "pack" as shown causes the root window to flash # quite a bit when scrolling (presumably due to the "grid_forget"s # briefly redisplaying the window with fewer rows. This isn't # visible on Linux. As a workaround on Windows I use a Canvas # which hides the flashing. # # 4. (MOST SEVERE) On Windows, with or without the Canvas widget, # moving the slider slowly hits a glitch when row #7 would be # the top row displayed. The slider jumps between a pair of # values (sometimes 0.56 and 0.7, sometimes other values), # causing the window to flash rapidly. I cannot get the slider # to position row #7 at the top -- it jumps to row #8 or row #6 # (or even lower). This does not happen on Linux -- scrolling # is smooth, no glitches. from Tkinter import * import sys class type1(Entry): def __init__(self,master, v='xxx'): self.v = StringVar() self.v.set(v) Entry.__init__(self, master, textvariable=self.v) class type2(Entry): def __init__(self,master, **kw): Entry.__init__(self,master,**kw) class frm(Frame): def __init__(self, master, **kw): Frame.__init__(self) self.x1 = type1(self,**kw) self.x1.pack(side=LEFT) self.fx2 = Frame(self) Label(self, text=' X2').pack(in_=self.fx2,side=LEFT) self.v2 = StringVar() self.v2.set('yy') self.x2 = type2(self,width=5,textvariable=self.v2) self.x2.pack(in_=self.fx2,side=LEFT) self.fx2.pack(side=LEFT) self.fx3 = Frame(self) Label(self,text=' X3').pack(in_=self.fx3,side=LEFT) self.x3 = type1(self, v='zzz') self.x3.pack(in_=self.fx3,side=LEFT) self.fx3.pack(side=LEFT) class testlist(Frame): def __init__(self, master, maxdisp=3, **kw): Frame.__init__(self,master) self.sb = Scrollbar(self, command=self.scroll) self.sb.grid(in_=self,row=0,column=1,rowspan=maxdisp,sticky=N+S) self.maxdisp = maxdisp self.frms = [frm(self,**kw)] self.active = 0 self.frms[0].grid(in_=self,row=0,column=0) def setsb(self,start,mv): dispfrac = self.maxdisp / float(len(self.frms)) startfrac = float(start) / len(self.frms) if mv == None: self.sb.set(startfrac, min(1, startfrac+dispfrac)) else: self.sb.set(mv, min(1, mv+dispfrac)) def redisp(self, start, mv=None): for xx in self.frms[self.active:self.maxdisp+self.active]: xx.grid_forget() yy = 0 for xx in self.frms[start:self.maxdisp+start]: xx.grid(in_=self,row=yy,column=0) yy += 1 self.setsb(start,mv) # print start, startfrac, min(1, startfrac+dispfrac) self.active = start def addentry(self, **kw): self.frms.append(frm(self,**kw)) # perhaps move to the end of the list ? self.redisp(self.active) def scroll(self,*xx): op, cnt = xx[0], xx[1] mv = None if op == "scroll": if xx[2] == 'pages': amt = self.maxdisp * int(xx[1]) else: amt = int(xx[1]) newstart = self.active + amt else: mv = min(1.0,max(0.0,float(cnt))) newstart = int(len(self.frms) * mv) print cnt, mv, newstart newstart = min(newstart, len(self.frms) - self.maxdisp) newstart = max(0, newstart) if newstart <> self.active: self.redisp(newstart,mv=mv) else: self.setsb(newstart,mv) def testcase(master): tt = testlist(master,v='1') for xx in range(2,11): tt.addentry(v=str(xx)) return tt if (__name__ == '__main__'): rr = Tk() try: arg1=sys.argv[1] except IndexError: arg1=None if arg1 == 'c': # use Canvas cc=Canvas(rr,height=300,width=600) cc.pack() tt = testcase(cc) tt.place(x=10, y=10) else: # just pack into root tt = testcase(rr) tt.pack() rr.mainloop()

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problem with pylab/tkinter?
by Alex Ter-Sarkissov Oct. 25, 2010

Oct. 25, 2010

hi, the problem might be bit silly... I'm desiging a GUI with Tkinter. Everythin worked (just couple buttons and entries). Then I decided I need to import pylab: from pylab import * as a result, I'm getting an error message TypeError: __init__() got an unexpected keyword argument 'text' which refers to the command line in def __init__(self) self.start_but=Button(root,text='Generate starting population') Like I said earlier, if I do not import pylab/matplotlib, no error messages are received. cheers, Alex

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