Tk_CreateEventHandler, Tk_DeleteEventHandler, Tk_GetButtonMask, Tk_SendVirtualEvent — associate procedure callback with an X event
- 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_SendVirtualEvent(tkwin, eventName, detail)
Tk_CreateEventHandler(tkwin, mask, proc, clientData)
Tk_DeleteEventHandler(tkwin, mask, proc, clientData)
Tk_SendVirtualEvent(tkwin, eventName, detail)
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
- unsigned button (in)
- const char *eventName (in)
The name of the virtual event.
- Tcl_Obj *detail (in)
Detail information for the virtual event.
- 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.
- ClientData clientData (in)
Arbitrary one-word value to pass to proc.
Proc should have arguments and result that match the
typedef void Tk_EventProc(
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
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
Copyright © 1990 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.