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- Tk_SetClass(3) Tk Library Procedures
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- NAME
- Tk_SetClass, Tk_Class - set or retrieve a window's class
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- SYNOPSIS
- #include <tk.h>
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- Tk_SetClass(_t_k_w_i_n, _c_l_a_s_s)
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- Tk_Uid
- Tk_Class(_t_k_w_i_n)
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- ARGUMENTS
- Tk_Window _t_k_w_i_n (in) Token for window.
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- char *_c_l_a_s_s (in) New class name for window.
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- DESCRIPTION
- Tk_SetClass is called to associate a class with a particular
- window. The _c_l_a_s_s 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 win-
- dows of that class. A window's class string is initialized
- to NULL when the window is created.
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- 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.
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- Tk_Class is a macro that returns the current value of
- _t_k_w_i_n's class. The value is returned as a Tk_Uid, which may
- be used just like a string pointer but also has the proper-
- ties of a unique identfier (see the manual entry for
- Tk_GetUid for details). If _t_k_w_i_n has not yet been given a
- class, then Tk_Class will return NULL.
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- KEYWORDS
- class, unique identifier, window, window manager
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- Tk 1
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