Tk_SetClass(3)

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NAME

       Tk_SetClass, Tk_Class - set or retrieve a window's class

SYNOPSIS

       #include <tk.h>

       Tk_SetClass(tkwin, class)

       Tk_Uid
       Tk_Class(tkwin)

ARGUMENTS

       Tk_Window   tkwin    (in)      Token for window.

       char        *class   (in)      New class name for window.
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DESCRIPTION

       Tk_SetClass  is  called  to associate a class with a particular window.
       The class string identifies the type of the window;  all  windows  with
       the same general class of behavior (button, menu, etc.) should have the
       same class.  By convention all class names start with a capital letter,
       and there exists a Tcl command with the same name as each class (except
       all in lower-case) which can be used to create and  manipulate  windows
       of that class.  A window's class string is initialized to NULL when the
       window is created.

       For main windows, Tk automatically propagates the name and class to the
       WM_CLASS  property used by window managers.  This happens either when a
       main window is actually created (e.g. in Tk_MakeWindowExist),  or  when
       Tk_SetClass  is  called,  whichever occurs later.  If a main window has
       not been assigned a class then Tk will not set  the  WM_CLASS  property
       for the window.

       Tk_Class  is  a  macro that returns the current value of tkwin's class.
       The value is returned as a Tk_Uid, which may be used just like a string
       pointer  but  also  has  the properties of a unique identifier (see the
       manual entry for Tk_GetUid for details).  If tkwin  has  not  yet  been
       given a class, then Tk_Class will return NULL.

KEYWORDS

       class, unique identifier, window, window manager

Tk                                                              Tk_SetClass(3)