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Tk_SetClassProcs(3)                         Tk Library Procedures                        Tk_SetClassProcs(3)



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NAME
       Tk_SetClassProcs - register widget specific procedures

SYNOPSIS
       #include <tk.h>

       Tk_SetClassProcs(tkwin, procs, instanceData)

ARGUMENTS
       Tk_Window tkwin (in)                    Token for window to modify.

       Tk_ClassProcs *procs (in)               Pointer  to  data structure containing widget specific proce-dures. procedures.
                                               dures.  The data  structure  pointed  to  by  procs  must  be
                                               static:  Tk  keeps  a  reference  to it as long as the window
                                               exists.

       ClientData instanceData (in)            Arbitrary one-word value to pass to widget callbacks.
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DESCRIPTION
       Tk_SetClassProcs is called to register a set of procedures that are used as  callbacks  in  different
       places.

       The structure pointed to by procs contains the following:
              typedef struct Tk_ClassProcs {
                  unsigned int size;
                  Tk_ClassWorldChangedProc *worldChangedProc;
                  Tk_ClassCreateProc *createProc;
                  Tk_ClassModalProc *modalProc;
              } Tk_ClassProcs;
       The  size  field  is  used  to simplify future expansion of the structure. It should always be set to
       (literally) sizeof(Tk_ClassProcs).

       worldChangedProc is invoked when the system has altered in some way that requires some reaction  from
       the widget.  For example, when a font alias (see the font manual entry) is reconfigured, widgets con-figured configured
       figured to use that font alias must update their display accordingly.  worldChangedProc  should  have
       arguments and results that match the type Tk_ClassWorldChangedProc:
              typedef void Tk_ClassWorldChangedProc(
                  ClientData instanceData);
       The  instanceData  parameter  passed  to  the  worldChangedProc will be identical to the instanceData
       parameter passed to Tk_SetClassProcs.

       createProc is used to create platform-dependant windows.  It is invoked by Tk_MakeWindowExist.   cre-ateProc createProc
       ateProc should have arguments and results that match the type Tk_ClassCreateProc:
              typedef Window Tk_ClassCreateProc(
                  Tk_Window tkwin,
                  Window parent,
                  ClientData instanceData);
       The  tkwin  and  instanceData  parameters  will be identical to the tkwin and instanceData parameters
       passed to Tk_SetClassProcs.  The parent parameter will be the parent of the  window  to  be  created.
       The createProc should return the created window.

       modalProc  is  invoked  after all bindings on a widget have been triggered in order to handle a modal
       loop.  modalProc should have arguments and results that match the type Tk_ClassModalProc:
              typedef void Tk_ClassModalProc(
                  Tk_Window tkwin,
                  XEvent *eventPtr);
       The tkwin parameter to modalProc will be identical to the tkwin parameter passed to Tk_SetClassProcs.
       The eventPtr parameter will be a pointer to an XEvent structure describing the event being processed.


KEYWORDS
       callback, class



Tk                                                   8.4                                 Tk_SetClassProcs(3)