Tk_SetClass(3) Tk 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
Page 1 (printed 2/26/99)
