Mailman 3 May 2010 - Tkinter-discuss

OptionMenu text justification
by Gary Scorby June 1, 2010

June 1, 2010

I'm new to Tkinter. I need a drop down box to display a selection list to an end user. It appears the best option for this is "OptionMenu" (If not, please suggest other options). I have it working like we want except for one thing, after selecting something from the list and closing the list, the text is centered in the window. We have some very long lines of text to choose from. When the choice is made we would like the chosen text to be left justified in the window. I've tried ever option I can find, but the text remains centered. Any assistance will be appreciated. Thank you Gary

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ANN: PyUseCase 3.3: GUI testing for Tkinter (and PyGTK)
by Geoff Bache May 27, 2010

May 27, 2010

Hi all, Tkinter support in PyUseCase, introduced in March, is coming along and has matured a fair amount in this release with support also added for three new widget types (Canvas, Checkbutton and Listbox). It's still quite new though and I could really use some feedback and for it to be tried a wider range of test applications. It should be easy to download and try out... Regards, Geoff Bache A bit more detail: PyUseCase is an unconventional GUI testing tool for PyGTK and Tkinter, along with a framework for testing Python GUIs in general. Instead of recording GUI mechanics directly, it asks the user for descriptive names and hence builds up a "domain language" along with a "UI map file" that translates this language into actions on the current GUI widgets. The point is to reduce coupling, allow very expressive tests, and ensure that GUI changes mean changing the UI map file but not all the tests. Instead of an "assertion" mechanism, it auto-generates a log of the GUI appearance and changes to it. The point is then to use that as a baseline for text-based testing, using e.g. TextTest. It also includes support for instrumenting code so that "waits" can be recorded, making it far easier for a tester to record correctly synchronized tests without having to explicitly plan for this. Homepage: http://www.texttest.org/index.php?page=ui_testing Download: http://sourceforge.net/projects/pyusecase Mailing list: https://lists.sourceforge.net/lists/listinfo/pyusecase-users (new) Bugs: https://bugs.launchpad.net/pyusecase/ Source: https://code.launchpad.net/pyusecase/

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OptionMenu Cannot Receive Keyboard Focus?
by Lowe, Paul J (AS) May 26, 2010

May 26, 2010

Hi, I've made a Tkinter gui composed of labels, entries, and optionmenus. When I enter data on the keyboard and use the tab key to switch to the next widget in the GUI, it always skips the OptionMenus entirely. For example, if I have a GUI composed of an entry, an optionmenu, and another entry, in that order, if I type text in the first entry, then hit the tab key, the cursor will go straight to the other text entry - skipping the optionmenu entirely. Has anyone else observed this phenomenon? Is there a workaround? Is it a formally documented bug? Kindest Regards and Thank You, Paul Lowe Simulation Engineer Northrop-Grumman Corporation, Aerospace Systems, CWIN Telephone: (858) 618-4499 San Diego (Rancho Bernardo), California, USA http://www.ngc.com

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after and after_idle
by Geoff Bache May 19, 2010

May 19, 2010

Hi all, Is there actually any difference between root.after_idle(foo) and root.after(0, foo) ? (I've noticed that if I call after_idle and re-add it at the end of my callbacks then any calls to "after" have no effect, and that I can work around this by doing after(0, ...) instead, but wondered if there were any drawbacks to doing this.) Regards, Geoff Bache

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What's the point of Toplevel.wait_window?
by Geoff Bache May 11, 2010

May 11, 2010

Hi all, I'm struggling to understand what the wait_window method on Tkinter.Toplevel objects actually achieves. It seemed on the surface like it would make the dialog modal, but it doesn't do that. The "grab_set" method achieves that. I realise that it starts some kind of local wait loop but I can't actually discern any external effect from calling it. Regards, Geoff Bache

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constraining toplevel windows to be on screen?
by Russell E. Owen May 6, 2010

May 6, 2010

I've received a bug report that my application's windows can appear off screen. This happens when a user has two monitors and saves window positions, then runs again later with only one monitor. Tkinter is apparently perfectly happy to display toplevel windows entirely off screen. At least on Mac OS X. The solution I've thought of is to get the full screen size using "root.wm_maxsize" and use that to constrain the geometry when restoring the window positions. However, it is messy code because tk geometry strings are complex: they may be missing the extent, or the extent may be positive or negative. So I was wondering if somebody had a simpler solution or had already written code they would be willing to share (and, preferably, allow me to redistribute in the RO package). It would suffice to show part of each window on screen, though it would be better to show the whole thing. Regards, -- Russell

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refreshing images
by Mark Peterson May 6, 2010

May 6, 2010

Hi, all. I'm brand new to using Tkinter, and was hoping to get a tip on getting images to refresh after pressing a button. The complete code I'm using is below. Basically, when I click on the "Next image" button, it will delete the original image (good) but the next image doesn't show up (bad). Is there a command that gets the canvas to redraw with the second image? Since I'm very new to Tkinter, the more explicit you could be about how to change the code, the more helpful it would be. Thanks very much for any help. Best, Mark def nextImage(): global canvas global item canvas.delete(item) im = Image.open("image2.gif") photo = ImageTk.PhotoImage(im) item = canvas.create_image(10,10,anchor=NW, image=photo) from Tkinter import * import Image import ImageTk root = Tk() im = Image.open("image1.gif") canvas = Canvas(root, height=im.size[1]+20, width=im.size[0]+20) canvas.pack(side=LEFT,fill=BOTH,expand=1) photo = ImageTk.PhotoImage(im) item = canvas.create_image(10,10,anchor=NW, image=photo) b1 = Button(root, text="Next image", width=15, command=nextImage) b1.pack() mainloop()

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Menu.unpost not working on Windows?
by Geoff Bache May 4, 2010

May 4, 2010

Hi all, I've been trying to use the "unpost" method on a popup menu and I cannot make it work on Windows. It works fine on Linux, but seems to have no effect on Windows even in simple cases. For example this basic example code the menu is not unposted in Windows and is shown as without the "unpost" line. Can anyone confirm or shed any light on this? Regards, Geoff from Tkinter import * root = Tk() w = Label(root, text="Right-click to display menu", width=40, height=20) w.pack() def next(*args): print "Next" # create a menu popup = Menu(root, tearoff=0) popup.add_command(label="Next", command=next) def do_popup(event): # display the popup menu popup.post(event.x_root, event.y_root) popup.unpost() w.bind("<Button-3>", do_popup) root.mainloop()

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