Mailman 3 September 2009 - Tkinter-discuss

Python 3.1; canvas rectangle dash & dashoffset
by Lion Kimbro Sept. 27, 2009

Sept. 27, 2009

Dear tkinter peoples, I'm having difficulties with dash, and dashoffset; Can anyone identify what I'm doing wrong? - Code: ---------------------------------------------------- import tkinter def move_dashes(canvas, rect, offset): print("move_dashes(%s, %s, %s)" % (canvas, rect, offset)) canvas.itemconfigure(rect, dashoffset=offset) canvas.after(1000, move_dashes, canvas, rect, offset+1) def dashoffset_test(): # Create a canvas canvas = tkinter.Canvas() canvas.pack() # Put a comparison rectangle on the canvas. canvas.create_rectangle(7, 2, 27,28, outline="blue", dash=(5,1)) # Put a rectangle on the canvas with a moving dash pattern. rect = canvas.create_rectangle(10,5, 30,30, dash=(4,1)) canvas.after(1000, move_dashes, canvas, rect, 1) canvas.mainloop() dashoffset_test() ============================================================ Two questions: 1. Why are the dash patterns so wildly different? canvas.create_rectangle(7, 2, 27,28, outline="blue", dash=(5,1)) canvas.create_rectangle(10,5, 30,30, dash=(4,1)) The first looks like: xxxxxxxxxxxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxxx The second looks like: xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx ...and yet, it's just (5,1) vs. (4,1) This is not what I expect from: http://infohost.nmt.edu/tcc/help/pubs/tkinter/dash-patterns.html 2. Why doesn't the dash pattern move? The call to canvas.itemconfigure(rect, dashoffset=offset) looks correct; Am I doing it wrong? I am using Python 3.1 Thank you, Lion Kimbro

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Threading issue with Tkinter Frame.insert
by Moray Grieve Sept. 18, 2009

Sept. 18, 2009

The code fragment below has an example where a Tk GUI is launched as a separate thread - this all works fine in Python 2.5, but in Python 2.6 the thread hangs. The issue seems to be in the line; self.messageBoxDetails.insert(INSERT, "Hello world") Comment this line out, or use an empty string rather than "Hello World", and the example works in both Python 2.5 and Python 2.6. I have not been able to see any related issues to this and wonder if this is a bug in the 2.6 Tkinter module? Thanks for any assistance. -Moray --------------------- import time, thread from Tkinter import * class ExampleError: def __init__(self): self.parentContainer = Tk() self.parentContainer.protocol('WM_DELETE_WINDOW', self.quitPressed) self.parentContainer.wm_geometry("500x400") self.parentContainer.title("Parent Container Title") self.container = Frame(self.parentContainer) self.messageBoxDetails = Text(self.container, wrap=WORD, width=1, height=1, padx=10, pady=10) # in python 2.6, this next statement hangs when running as a thread - note that # inserting an empty string works though self.messageBoxDetails.insert(INSERT, "d") self.messageBoxDetails.pack(fill=BOTH, expand=YES, side=LEFT) self.container.pack(fill=BOTH, expand=YES, padx=5, pady=5) def quitPressed(self): self.stop() def start(self): self.parentContainer.mainloop() def stop(self): self.parentContainer.quit() self.parentContainer.destroy() if __name__ =="__main__": example = ExampleError() time.sleep(1) thread.start_new_thread(example.start, ()) time.sleep(5) <http://www.progress.com/>

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ImageTk.PhotoImage: empty image not holding its size
by Dan Halbert Sept. 17, 2009

Sept. 17, 2009

Hi, I have a picky question about using an empty ImageTk.PhotoImage. I am trying to create a placeholder space for an image that will be supplied later - something like this: root = Tk() pimage = ImageTk.PhotoImage('RGB', (300,300)) image_holder = Label(root, image=pimage) image_holder.grid() However, the result is a a tiny window, not one with a 300x300 empty space. If I do pimage.paste(...) later with a real image, it grows as expected to fit the image. I could set the width and height of the Label to 300x300 when I create it, but shouldn't the empty PhotoImage act like a 300x300 image? Thanks, Dan

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Horizontal scroll canvas
by Bradley Hintze Sept. 15, 2009

Sept. 15, 2009

I am trying to make a scrollable canvas in the horizontal direction but I am having a difficult time. I get the whole scroll bar and can scroll using the arrows on the ends of the scroll bar but the actual bar (the slider bar) takes up the whole scrollbar area as if there is nothing to scroll. Thus, the slider bar cannot be used to scroll. (It may be easier to understand if you just run the snipit of code) I am wondering how I can fix this. Here is my code: from Tkinter import * from tkFileDialog import * import os class analyze_notes: def __init__(self): string='' for i in range(0,100):string=string+' '+str(i) self.comp_1=Tk() self.comp_1.title('Try') l1=Label(self.comp_1, text='Try canvas').grid() c1_xscroll=Scrollbar(self.comp_1, orient=HORIZONTAL) c1_xscroll.grid(row=2, sticky=E+W+N) c1=Canvas(self.comp_1, height=150, width=400, relief=SUNKEN, xscrollcommand=c1_xscroll.set) c1.grid(row=1) c1_xscroll.config(command=c1.xview) self.topic_label = Label(c1, text=string, font=('courier',10), bg='white') c1.create_window(0, 50, window=self.topic_label, anchor=NW) self.comp_1.mainloop() r=analyze_notes() Thanks in advance, -- Bradley J. Hintze Graduate Student Duke University School of Medicine 801-712-8799

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Help on subclassing - Tkinter.Menu
by thicket Sept. 13, 2009

Sept. 13, 2009

Hi - I'm building menus based on data from a configuration file - to date I've created standard python classes to represent the menu data then used Tkinter to retrieve the information and create the menu widgets. So I thought why not take it a step further and combine the two - sample test code below #!/usr/bin/env python from Tkinter import * class MyMenu(Menu): def __init__(self,parent): Menu.__init__(self,parent, tearoff=0) self.label1="Mylabel" self.label2="Myexit" def my_add(self): self.add_command(label=self.label1, command=root.quit) # did not expect this to work Menu.add_command(self,label=self.label2, command=root.quit) # this I thought may work root = Tk() menubar = Menu(root) menu=MyMenu(menubar) menu.my_add() menubar.add_cascade(label="Test", menu=menu) root.config(menu=menubar) mainloop() What I would like to do is not hardcode the 'tearoff=0' in the parent class constructor i.e. instantiate MyMenu by menu=MyMenu(menubar, tearoff=0) Also not 100% sure why both add_command() statements in my_add() work? Thanks -- View this message in context: http://www.nabble.com/Help-on-subclassing---Tkinter.Menu-tp25419747p2541974… Sent from the Python - tkinter-discuss mailing list archive at Nabble.com.

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Tktable module for python 3.1
by simha Sept. 11, 2009

Sept. 11, 2009

Hi all, Need some help. I found out a module Tktable to draw a table, access the cell contents and retrieve data, put data etc., But I am not able to use the module. Can anyone help me with the installation. I am trying to do this on windows... The module is available at http://sourceforge.net/projects/tktable/files/ If anyone have already used it, then please help me setting up the module... My mail id is supersimha(a)gmail.com(supersimha(at)gmail(dot)com) The code for Tktable is as said below import tktable table = tktable.Table(parent, rows = 5, cols = 5 ) -- View this message in context: http://www.nabble.com/Tktable-module-for-python-3.1-tp25402719p25402719.html Sent from the Python - tkinter-discuss mailing list archive at Nabble.com.

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Draw a table in Python 3.1
by Harm Kirchhoff Sept. 7, 2009

Sept. 7, 2009

I looked into the same problem a while ago and I was not able to make the Tktable gadget work on windows. If you ever manage, it would be great if you could post a detailed step-to-step list. I found an alternative that worked even better in my case. There is a MultiListBox gadget (several versions exist) that emulates a table by putting a number of synchronized lists next to each other. It features sorting, so that the table can be resorted by any column at a mouse click and some other good features. Bigest set back is that it is not good for numerical calculations. The fields are left adjusted and summing up &c. is optically not nice to implement. HK

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Draw a table in Python 3.1
by simha Sept. 4, 2009

Sept. 4, 2009

Hi all. I am very new to the world of python. I am desining a GUI using the tkinter module and would like to include a table of 6 columns and n rows. I am developing this code in windows xp. I downloaded a tktable module. But not able to install this. Please help me in this regard. Thanks in advance -- View this message in context: http://www.nabble.com/Draw-a-table-in-Python-3.1-tp25261023p25261023.html Sent from the Python - tkinter-discuss mailing list archive at Nabble.com.

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Canvas tag bindings not going away?
by Bob Greschke Sept. 1, 2009

Sept. 1, 2009

Doesn't ACanvas.delete(ALL) get rid of bindings too? I'm drawing regular map dots (create_oval) on a Canvas "map" and each one gets a Tag, like "P1", "P2", etc. I do a tag_bind to <Button-3> to get a popup menu item for each dot. Everything works fine. I then have two radiobuttons, one for a regular map (described above), and one for drawing the dots a different color depending on elevation. When the Redraw button is hit with the elevation map mode selected the canvas gets cleared, the background color gets changed, a .delete(ALL) is done (and a .find_all() returns ()), I redraw the create_oval()s with the same kind of Tags ("P1", "P2", etc.), but without doing a tag_bind to <Button-3> (same bunch of code, just with an if-statement to control which kind of dot gets drawn). The new dots still react to a <Button-3> event like as if the TAG is still bound to the <Button-3> event. If I start all over, but draw the elevation map first then the dots don't do the popup menu. If I then redraw with the normal map option the popup menu bind gets bound to the dots from that point on. Do I have to loop through all of the items and delete the tags before doing the .delete(ALL) or something? This could be major. I use a lot of Tags and binds on a lot of Canvases, but I've never noticed this before. It's doing this on several OSs and versions of everything, so it must be me. Thanks! Bob

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