Tk_CreateEventHandler, Tk_DeleteEventHandler, Tk_GetButtonMask, Tk_SendVirtualEvent - associate procedure

       unsigned button (in)                   Button number.

       const char *eventName (in)             The name of the virtual event.

       Tcl_Obj *detail (in)                   Detail information for the virtual event. May be NULL.

       Tk_Window tkwin (in)                   Token for window in which events may occur.

       unsigned long mask (in)                Bit-mask of events (such as ButtonPressMask) for which proc should
                                              be called.

       Tk_EventProc *proc (in)                Procedure to invoke whenever an event in mask occurs in the window
                                              given by tkwin.

       void *clientData (in)                  Arbitrary one-word value to pass to proc.
________________________________________________________________________________________________________________

Tk_CreateEventHandler  arranges  for  proc  to  be  invoked in the future whenever one of the event types
       specified by mask occurs in the window specified by  tkwin.   The  callback  to  proc  will  be  made  by
       Tk_HandleEvent;  this  mechanism  only  works in programs that dispatch events through Tk_HandleEvent (or
       through other Tk procedures that call Tk_HandleEvent, such as Tcl_DoOneEvent or Tk_MainLoop).

       Proc should have arguments and result that match the type Tk_EventProc:
              typedef void Tk_EventProc(
                      void *clientData,
                      XEvent *eventPtr);
       The clientData parameter to proc is a copy of the clientData argument given to Tk_CreateEventHandler when
       the callback was created.  Typically, clientData points  to  a  data  structure  containing  application-
       specific information about the window in which the event occurred.  EventPtr is a pointer to the X event,
       which will be one of the ones specified in the mask argument to Tk_CreateEventHandler.

       Tk_DeleteEventHandler  may  be called to delete a previously-created event handler:  it deletes the first
       handler it finds that is associated with tkwin and matches the mask, proc, and clientData arguments.   If
       no  such  handler  exists,  then Tk_HandleEvent returns without doing anything.  Although Tk supports it,
       it's probably a bad idea to have more than  one  callback  with  the  same  mask,  proc,  and  clientData
       arguments.   When  a  window  is deleted all of its handlers will be deleted automatically;  in this case
       there is no need to call Tk_DeleteEventHandler.

       If multiple handlers are declared for the same type of X event on the same window, then the handlers will
       be invoked in the order they were created.

       Tk_GetButtonMask returns the button mask corresponding to the button. E.g it will return Button1Mask  for
       button Button1.

       Tk_SendVirtualEvent sends a virtual event to Tk's event queue.

       bind, callback, event, handler

Tk                                                                                    Tk_CreateEventHandler(3tk)

       Tk_CreateEventHandler, Tk_DeleteEventHandler, Tk_GetButtonMask, Tk_SendVirtualEvent - associate procedure
       callback with an X event

#include<tk.h>Tk_CreateEventHandler(tkwin,mask,proc,clientData)

       Tk_DeleteEventHandler(tkwin,mask,proc,clientData)

       Tk_GetButtonMask(button)

       Tk_SendVirtualEvent(tkwin,eventName,detail)