FAQ Graficzny Interfejs Użytkownika

Pytania ogólne o GUI

Jakie zestawy narzędzi GUI istnieją dla Pythona?

Standardowe kompilacje Pythona zawierają obiektowy interfejs do zestawu widżetów Tcl/Tk, zwany tkinter. Jest to prawdopodobnie najłatwiejszy do zainstalowania (ponieważ jest dołączony do większości binarnych dystrybucji Pythona) i używania. Więcej informacji o Tk, w tym wskazówki do źródeł, można znaleźć na stronie domowej Tcl/Tk. Tcl/Tk jest w pełni przenośny na platformy macOS, Windows i Unix.

Depending on what platform(s) you are aiming at, there are also several alternatives. A list of cross-platform and platform-specific GUI frameworks can be found on the python wiki.

Pytania dotyczące Tkinter

How do I freeze Tkinter applications?

Freeze is a tool to create stand-alone applications. When freezing Tkinter applications, the applications will not be truly stand-alone, as the application will still need the Tcl and Tk libraries.

One solution is to ship the application with the Tcl and Tk libraries, and point to them at run-time using the TCL_LIBRARY and TK_LIBRARY environment variables.

To get truly stand-alone applications, the Tcl scripts that form the library have to be integrated into the application as well. One tool supporting that is SAM (stand-alone modules), which is part of the Tix distribution (https://tix.sourceforge.net/).

Build Tix with SAM enabled, perform the appropriate call to Tclsam_init(), etc. inside Python’s Modules/tkappinit.c, and link with libtclsam and libtksam (you might include the Tix libraries as well).

Can I have Tk events handled while waiting for I/O?

On platforms other than Windows, yes, and you don’t even need threads! But you’ll have to restructure your I/O code a bit. Tk has the equivalent of Xt’s XtAddInput() call, which allows you to register a callback function which will be called from the Tk mainloop when I/O is possible on a file descriptor. See File Handlers.

I can’t get key bindings to work in Tkinter: why?

An often-heard complaint is that event handlers bound to events with the bind() method don’t get handled even when the appropriate key is pressed.

The most common cause is that the widget to which the binding applies doesn’t have „keyboard focus”. Check out the Tk documentation for the focus command. Usually a widget is given the keyboard focus by clicking in it (but not for labels; see the takefocus option).