Mailman 3 February 2005 - Tkinter-discuss

Tkinter clipboard_get method...
by Martin Franklin April 12, 2005

April 12, 2005

Hi all, I just submitted a patch to python (SF #1063914) that adds the clipboard_get method. As it stands this method will raise a TclError if it is called and the clipboard (the system clipboard) is empty... my question is therefore should I catch this exception in the Tkinter clipboard_get method (and return an empty string / None?) or let the user worry about it? Cheers Martin -- Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

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Another problem -- deselecting individual entries in Tix HList
by Jared Cohen March 2, 2005

March 2, 2005

According to the documentation for the Tcl version of Tix, it's possible to use selection_clear() to deselect individual entries, as opposed to the entire selection. The documentation says the following: pathName selection clear ?from? ?to? When no extra arguments are given, deselects all of the list entrie(s) in this HList widget. When only from is given, only the list entry identified by from is deselected. When both from and to are given, deselects all of the list entrie(s) between between from and to, inclusive, without affecting the selection state of entries outside that range. However, I can't for the life of me figure out how to get this functionality in Python. You'd think that you could just pass in "from" and "to" as individual arguments, but you'd be wrong -- the Python version of selection_clear() has the form: selection_clear(self, cnf={}, **kw) . It expects a dictionary and/or a keyword list. And I can't figure out the right syntax for that "from-to" thing. Can anyone help please?

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Custom cursor?
by Russell E. Owen March 1, 2005

March 1, 2005

I'd like to create a few custom cursors Tkinter (including a magnifying glass). >From reading the documentation I could find, it appears that the only cross-platform way to specify cursors in Tk is using Tk_GetCursorFromData*. Unfortunately, I can't seem to figure out how to run this from Tkinter. root.tk.call("Tk_GetCursorFromData") fails with invalid command name "Tk_GetCursorFromData". Any suggestions? -- Russell *on unix one can allegedly use "@bitmapfile.xbm" as the cursor specifier, but this is not cross-platform and it didn't even work in my one test on unix.

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Re: Problem with Text widget's "see" method
by Jared Cohen Feb. 23, 2005

Feb. 23, 2005

Well son of a gun! It works!! Many thanx guys, this will do quite nicely!! :-)

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Re: Problem with Text widget's "see" method
by Jared Cohen Feb. 23, 2005

Feb. 23, 2005

Sorry, I forgot to include the previous message text: >Martin Franklin wrote: >> Jared Cohen wrote: >> >>>> >>>> >>>> I see you got lots of help on the 'see' problem I just wanted to >>>> point out the Text widget comes with it's own undo/redo methods as of >>>> Tk 8.4 >>>> so if you have an up to date Python & Tk you should be able to use them >>>> >>> >>> Thanks anyway, but the undo doesn't seem to work. It's weird, because >>> there IS an edit_undo() method in Tkinter.py (the Python wrapper), but >>> apparently, the underlying Tk doesn't understand the command. Oh well. >> >> >> I guess your Tk version is not >= 8.4 thats too bad. >> >>> >>> Anyway, I still need some help with this "see" problem. Come on guys, >>> isn't there a way to fix this? >>> >>> >> >> I have tried a couple of things but it boils down to the fact you are >> replacing all the text in the widget, it just has to move (without the >> see call it moves the viewpoint to the top of the text widget) If I >> were you I would investigate the IDLE undo / redo stuff Fredrik pointed >> you to, it undoes / redoes just the small changes (not the entire >> document) I must admit *I* looked into that code when I needed undo / >> redo in a small project, I couldn't quite grok the code, eventually the >> need went away, but it would be nice if we could use the undo/redo from >> idlelib on *any* Tkinter Text widget - I seem to remember when I was >> looking at it it had a lot of idle dependencies... you couldn't just, >> for example: >> >> undoer = idlelib.Undoer(myTextWidget) # or whatever it's called >> >> and have it look after the undo and redo 'ing of your text widget >> would be nice if we could though;-) > >And it seems (after a little more investigation) we can... > >from Tkinter import Tk, Text > >from idlelib.Percolator import Percolator >from idlelib.UndoDelegator import UndoDelegator >root= Tk() > > >text = Text(root) >text.pack() > >per = Percolator(text) >undo = UndoDelegator() >per.insertfilter(undo) > >text.bind("<F1>", undo.undo_event) >text.bind("<F2>", undo.redo_event) > >root.mainloop() > >*Seems to work* but has only been tested for 1 minute.... > >Cheers, >Martin. > > > > > > > > ------------------------------------------------------------------------ > Previous message:

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Shrinking and Expanding a Frame widget
by Martin Franklin Feb. 22, 2005

Feb. 22, 2005

Hi all, I just wanted to ask if anyone has been able to programatically shrink or expand a Frame widget by setting it's height. I have this.... self.height = self.frame.winfo_reqheight() for a in range(self.height, 0, -1): self.frame.configure(height=str(a)) self.update_idletasks() time.sleep(0.1) But it doesn't work! If I set the time.sleep to 1 second the widget flashes (every second) but doesn't shrink. The frame widget is packed (with fill and expand set) perhaps this is interfering (I have tried changing the packing options to no avail! I googled for shrinking Tk Frame widget - and got a few hits but mostly links for other widget sets (Tix, etc) *I* am restricted to pure Tkinter widgets Martin

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Re: Problem with Text widget's "see" method
by Jared Cohen Feb. 18, 2005

Feb. 18, 2005

> > >I see you got lots of help on the 'see' problem I just wanted to point >out the Text widget comes with it's own undo/redo methods as of Tk 8.4 >so if you have an up to date Python & Tk you should be able to use them > Thanks anyway, but the undo doesn't seem to work. It's weird, because there IS an edit_undo() method in Tkinter.py (the Python wrapper), but apparently, the underlying Tk doesn't understand the command. Oh well. Anyway, I still need some help with this "see" problem. Come on guys, isn't there a way to fix this?

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Tk resource file for layout manager
by Gabriel B. Feb. 16, 2005

Feb. 16, 2005

i'm using almost every widget property from my pyTk programs in the form of resources, like: self.tk.option_add ( "*InputClass*background", "White" ) In the widget creation i have only the Class and the Command attribute, but i'm having to add some tk options to the geometry method, in the case, pack. Is there any way to overcome this? For example, every single Frame i pack i use, at least: self.pack(fill='both', expand=1) I'd love to have something like: self.tk.option_add ( "*Frame*fill", 'both' ) self.tk.option_add ( "*Frame*expand", 'yes' ) Is there anything like it? Thanks,

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Yet Another Table widget...
by Martin Franklin Feb. 15, 2005

Feb. 15, 2005

All, I stumbled across a pure tcl table widget here:- http://www.nemethi.de/ and thought it may be of interest. I have started writing the python bindings for it (I couldn't find any with google) and will add a link to the wiki when i'm done... I have played with it on Windows (Python 2.4, Win2K) and Linux (Python 2.3.4, Fedora Core 3 and Python 2.2.?, RedHat 9) Cheers, Martin.

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Problem with Text widget's "see" method
by Jared Cohen Feb. 15, 2005

Feb. 15, 2005

I'm building a text editor that has an Undo/Redo feature. To do this, I basically invoke a callback every time the user presses a key; the callback copies the entire contents of the Text widget to a history list. Later, if the user presses Ctrl-Z, the widget steps back through the history list, and if the user presses Ctrl-Y, it steps forward. Now, I not only want the widget to recall its previous contents when the user does an Undo, but I also want it to remember the position of the insertion cursor and automatically set the cursor to that position. I did this by saving the index (i.e. "1.0") of the cursor each time a new history item is added; then, when that item is recalled, I can set the cursor back to that index. Of course, the Text widget doesn't actually HAVE a method to explicitly set the position of the cursor; so I simulated that behavior by using event_generate to pretend the user had actually clicked at the desired position. Now, here's the problem. The "pretend clicking" method will only work if it can get the on-screen coordinates of the index, which means the index needs to actually be on screen. To ensure that it is, I used the Text widget's "see" method, which is supposed to scroll the widget so the desired index is visible, IF it isn't already visible. But the "see" method doesn't work correctly. If the user enters text on the first "screen" (i.e. when the scroll bar is at the top) and then hits Ctrl-Z, no scrolling occurs -- the index is still on screen. But if the added text is on a later "screen", then the widget scrolls so the index is in the center of the screen, even if it's already visible! I tried explicitly using the "bbox" method, which is supposed to return None if the index is off-screen; but that didn't work either! I think the problem is that when I perform an Undo, I completely erase the Text widget and refill it with the previous history item -- this seems to mess up the indices somehow. Any thoughts as to how I can fix this? Here's some sample code. Be warned, it's pretty long. To test it, first scroll down a few pages; type some characters into the text widget; scroll down a little more, but make sure the new text is still visible; and then hit Ctrl-Z. The added text is still visible, so the widget SHOULDN'T scroll, but it does anyway. ---------------------------------------------------------------------------------------- #!/usr/bin/env python import sys, os, Tkinter, types, tkFont, Pmw def makeResizable(widget): for i in range(0, widget.grid_size()[0]): widget.columnconfigure(i, weight=1) for i in range(0, widget.grid_size()[1]): widget.rowconfigure(i, weight=1) class seeTest: def __init__(self, root): self.root = root self.tableText = Pmw.ScrolledText(self.root, text_bg='white', text_wrap='none') self.tableText.grid(row=0, rowspan=20, column=0, columnspan=20, sticky='nsew') fileName = "/home/textfile.txt" #this can be any text file file = open(fileName, "r") lines = file.readlines() file.close() for l in lines: self.tableText.component('text').insert("end", l) self.tableText.component('text').see("1.0") self.root.update_idletasks() self.history = [(self.tableText.getvalue(), "1.0"), ] self.curHist = 0 self.tableText.component('text').bind("<Any-KeyPress>", self.AddHistory) self.tableText.component('text').bind("<Control-Any-KeyPress>", self.AddHistory) self.tableText.component('text').bind("<Any-KeyRelease>", self.AddHistory) self.tableText.component('text').bind("<Control-Any-KeyRelease>", self.AddHistory) self.tableText.component('text').bind("<KeyPress-Control_L>", self.Dummy) self.tableText.component('text').bind("<KeyPress-Control_R>", self.Dummy) self.tableText.component('text').bind("<KeyRelease-Control_L>", self.Dummy) self.tableText.component('text').bind("<KeyRelease-Control_R>", self.Dummy) self.tableText.component('text').bind("<Control-KeyPress-z>", self.Undo) self.tableText.component('text').bind("<Control-KeyPress-Z>", self.Undo) self.tableText.component('text').bind("<Control-KeyRelease-z>", self.Dummy) self.tableText.component('text').bind("<Control-KeyRelease-Z>", self.Dummy) self.root.update() makeResizable(self.root) def AddHistory(self, *args): self.tableText.update_idletasks() text = self.tableText.getvalue() if text != (self.history[self.curHist])[0]: while self.curHist < len(self.history)-1: self.history.pop() self.root.update_idletasks() index = str(self.tableText.component('text').index(Tkinter.INSERT)) self.history.append( (text, index) ) self.curHist += 1 def Undo(self, *args): if self.curHist == 0: self.root.bell() else: self.curHist -= 1 text = (self.history[self.curHist])[0] if text[-1] == '\n': text = text[:-1] if self.curHist == 0: index = (self.history[1])[1] else: index = (self.history[self.curHist])[1] self.tableText.component('text').delete("1.0", "end") self.tableText.component('text').insert("end", text) self.tableText.component('text').update_idletasks() self.tableText.component('text').see(index) return "break" def Dummy(self, *args): return "break" def main(): root = Tkinter.Tk() root.geometry("1000x600+0+0") Pmw.initialise(root) test = seeTest(root) root.mainloop() if __name__=='__main__': main()

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