Mailman 3 July 2005 - Tkinter-discuss

opps, never mind
by Dahlke, Doug July 21, 2005

July 21, 2005

Ah ha, never mind. Silly typo was all. Forget post. It's the same.

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errors in versions?
by Dahlke, Doug July 21, 2005

July 21, 2005

I guess I'm a semi-newbie to python. I played with it a number of years ago and thought this was way better than perl in some respects. Going over the old 'Learning Python' book again I tried a couple of the gotchas. I realize I'm running some fairly old versions of python, but shouldn't be too out of date. I have the windows version PythonWin 2.3.2 (#49, Nov 13 2003, 10:34:54) [MSC v.1200 32 bit (Intel)] on win32. On our SCO system, yes I know.. why?, I'm running Python 2.4.1 (#10, Jun 27 2005, 16:01:01) [C] on unixware7. One would think these are fairly close together as far as updates. I am running the PythonWin app on my windows so maybe that's why. Anyway, running the 'Gotchas' on page 121 as below, the windows version works as you would hope it would, you get the answer 81 as you would expect if you didn't know it was a gotcha. On the unix server, you get 16 which is what the book says. Here is the code: >>> def outer(x,y): ... def inner(a=x, b=y): ... return a**b ... return inner ... >>> x = outer(2,4) >>> x() 16 Just wonder if anyone else found that to be a problem with levels Doug Dahlke I.T. Dept Shields Bag and Printing

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Switching between Entry widgets
by Jay Taneja July 21, 2005

July 21, 2005

hi everyone - i'm relatively new to python/tkinter, so it may be something pretty silly i've overlooked. the tkinter application i have written has two entry widgets and two buttons. what i would like is for the focus to be on the first entry widget, such that i launch the program and can immediately input text into the entry box. for some reason, i am unable to get the focus() command working for me. additionally, the input device i am using to put text in the entry boxes ends in a carriage return. as soon as this carriage return is received in the first entry box, i would like the focus to go to the second entry box. when the second entry box gets a carriage return, i would like to issue the callback of the first button widget. this all seems to make sense in my head, binding the <Return> keypress to switch the focus, but i can't seem to get everything working correctly. the program doesn't respond to my bindings and i can't get the focus switching to work at all. any help would be greatly appreciated. thank you. -jay

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pybwidget
by Michael Lange July 20, 2005

July 20, 2005

I've been playing around with pybwidget a little and found two bugs that stop the ListBox and Tree widgets from working. First, the "plus" and "minus" bitmaps are missing from the images directory, so you cannot set the drawcross option in bwidget.Tree.insert() to "auto" or "allways". Second there's a typo in ListBox.insert(): __init__.py line 455: def insert(self, index, item="#auto", **kw): return self.tk.call(self._w, "insert", parent, item,# this must be "index" *self._options(kw)) ^^^^^^

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<urgent>
by Shallu Gupta July 15, 2005

July 15, 2005

Respected Sir I need ur favour... i just started using Python....Actually i wanna work with Graphics in python So whenver i write " from graphics Import *" i get following message "Traceback (Most Recent Call last); File "<stdin>', line1,in? File "/staff/shalu/python-2.4.1/lib/graphics.py".line ? import TKinter File "/staff/shalu/python-2.4.1/lib/lib_tk/TKinter.py" import_TKinter # if this fails your Python may not be configured for TK import Error: no module named _TKinter Plz help me out.... tell me how to configure Python wiht Tk. Regards Shalu Lead me from the unreal to the real Lead me from darkness to light Lead me from death to immortality. -Invocation from the Upanishads __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Fwd: <urgent>
by Shallu Gupta July 15, 2005

July 15, 2005

Note: forwarded message attached. Lead me from the unreal to the real Lead me from darkness to light Lead me from death to immortality. -Invocation from the Upanishads __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Avoiding memory leaks using tk.call
by Russell E. Owen July 7, 2005

July 7, 2005

I'm writing code that retrieves URLs to files on disk using tcl's http module. (Why bother? See P.S.) So far, so good, but I'm a bit worried I may be leaking memory. Thus I open the output file and start the transfer with: self._tclFile = self._tkApp.call('open', self.toPath, mode) mode,)) self._tclHTTPConn = self._tkApp.call( '::http::geturl', self.url, '-channel', self._tclFile, '-command', self._tclHTTPDoneCallback, '-progress', self._tclHTTPProgressCallback, '-binary', self.isBinary, '-timeout', self.timeLimMS ) And clean up afterwards using: self._tclHTTPConn != None: self._tkApp.call("::http::cleanup", self._tclHTTPConn) self._tclHTTPConn = None self._tclFile: self._tkApp.call("close", self._tclFile) self._tclFile = None and I delete the callbacks from tcl using self._tkApp.deletecommand. It works, but I'm wondering if I'm leaking the reference to the file or http connection that was created inside tcl. If so, any hints on how to clean those up would be much appreciated. -- Russell P.S. why bother: - I don't want my users to have to install Twisted framework. Though I get closer to that every time something like this comes up. - I've tried using the built in python libraries for stuff like this, but it's a hassle due to no integration with the tk event loop. The resulting code does work, but doing without blocking is painful as is keeping track of state. Plus I've had reports of occasional failures that I can't reproduce on my computer. P.P.S. The resulting code will be released in an update to my free RO package <http://www.astro.washington.edu/rowen/ROPython.html>. The package already includes tk sockets and lots of other goodies.

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Again: python wrapper for tkDnD
by Michael Lange July 7, 2005

July 7, 2005

Hello again, after some more hours of work on the tkDnD python wrapper I came to use a new concept, which makes the Tk dnd and shape commands directly accessable from any Tkinter widget. As far as I have tested (not very far, though) it seems to work now. However, it is the first time for me to try writing a python wrapper for a Tk extension, so I am still not sure about the way to go. Anyone who is interested can find it at: http://www.8ung.at/klappnase/TkinterDnD/TkinterDnD.html Any feedback is much appreciated. Best regards Michael

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python wrapper for tkDnD
by Michael Lange July 5, 2005

July 5, 2005

Hello list, looking for a way to achieve inter-application drag and drop capabilities for Tkinter I came to look at the tkDnD extension for tcl/tk (http://sourceforge.net/projects/tkdnd) which adds native drag and drop support on windows and unix. I couldn't find some approach to write a python interface for it anywhere though, so I decided to try and write my own. I currently got it at least partially working; before I do more detail work and testing I would like to ask the experts here, what you think about the general approach I used. (See the code below, a small demo included) I could also use a helping hand on some of the tk related things, the way I create the command strings for tk doesn't look very good to me , but I cannot figure out how to do it better. Any feedback is highly appreciated. Thanks in advance Michael ############### file DnD.py ############################################################### '''Python wrapper for the tkDnD tk extension.''' class DnD: def __init__(self, tkroot): self._tkroot = tkroot tkroot.tk.eval('package require tkdnd') # make self an attribute of the parent window for easy access in child classes tkroot.dnd = self def bindsource(self, widget, type=None, command=None, arguments=None, priority=None): '''Register widget as drag source; for details on type, command and arguments, see bindtarget(). priority can be a value between 1 and 100, where 100 is the highest available priority (default: 50). If command is omitted, return the current binding for type; if both type and command are omitted, return a list of registered types for widget.''' command = self._generate_callback(command, arguments) tkcmd = self._generate_tkcommand('bindsource', widget, type, command, priority) res = self._tkroot.tk.eval(tkcmd) if type == None: res = res.split() return res def bindtarget(self, widget, type=None, sequence=None, command=None, arguments=None, priority=None): '''Register widget as drop target; type may be one of text/plain, text/uri-list, text/plain;charset=UTF-8 (see the man page tkDND for details on other (platform specific) types); sequence may be one of '<Drag>', '<DragEnter>', '<DragLeave>', '<Drop>' or '<Ask>' ; command is the callback associated with the specified event, argument is an optional tuple of arguments that will be passed to the callback; possible arguments include: %A %a %b %C %c %D %d %L %m %T %t %W %X %x %Y %y (see the tkDND man page for details); priority may be a value in the range 1 to 100 ; if there are bindings for different types, the one with the priority value will be proceeded first (default: 50). If command is omitted, return the current binding for type, where sequence defaults to '<Drop>'. If both type and command are omitted, return a list of registered types for widget.''' command = self._generate_callback(command, arguments) tkcmd = self._generate_tkcommand('bindtarget', widget, type, sequence, command, priority) res = self._tkroot.tk.eval(tkcmd) if type == None: res = res.split() return res def clearsource(self, widget): '''Unregister widget as drag source.''' self._tkroot.tk.call('dnd', 'clearsource', widget) def cleartarget(self, widget): '''Unregister widget as drop target.''' self._tkroot.tk.call('dnd', 'cleartarget', widget) def drag(self, widget, actions=None, descriptions=None, cursorwindow=None, command=None, arguments=None): '''Initiate a drag operation with source widget.''' command = self._generate_callback(command, arguments) if actions: if actions[1:]: actions = '-actions {%s}' % ' '.join(actions) else: actions = '-actions %s' % actions[0] if descriptions: descriptions = ['{%s}'%i for i in descriptions] descriptions = '{%s}' % ' '.join(descriptions) if cursorwindow: cursorwindow = '-cursorwindow %s' % cursorwindow tkcmd = self._generate_tkcommand('drag', widget, actions, descriptions, cursorwindow, command) self._tkroot.tk.eval(tkcmd) def _generate_callback(self, command, arguments): '''Register command as tk callback with an optional list of arguments.''' cmd = None if command: cmd = self._tkroot._register(command) if arguments: cmd = '{%s %s}' % (cmd, ' '.join(arguments)) return cmd def _generate_tkcommand(self, base, widget, *opts): '''Create the command string that will be passed to tk.''' tkcmd = 'dnd %s %s' % (base, widget) for i in opts: if i is not None: tkcmd += ' %s' % i return tkcmd #############--demo code--######################################## def test(): import Tkinter root = Tkinter.Tk() dnd = DnD(root) Tkinter.Label(root, text='Drop files from your file manager into the listbox').pack(side='top') l = Tkinter.Listbox(root) l.pack(side='top', fill='both', expand=1) root.update()# may be necessary on unix # now make the listbox a drop target: def drag(action, actions, type, win, X, Y, x, y, data): return action def drag_enter(action, actions, type, win, X, Y, x, y, data): l.focus_force() return action def drop(action, actions, type, win, X, Y, x, y, data): files = data.split() for f in files: l.insert('end', f) dnd.bindtarget(l, 'text/uri-list', '<Drag>', drag, ('%A', '%a', '%T', '%W', '%X', '%Y', '%x', '%y', '%D')) dnd.bindtarget(l, 'text/uri-list', '<DragEnter>', drag_enter, ('%A', '%a', '%T', '%W', '%X', '%Y', '%x', '%y', '%D')) dnd.bindtarget(l, 'text/uri-list', '<Drop>', drop, ('%A', '%a', '%T', '%W', '%X', '%Y', '%x', '%y','%D')) root.mainloop() if __name__ == '__main__': test() ################ end of DnD.py #######################################################

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