XSetInputFocus(3X11)          SDK X11 R4.11MU05         XSetInputFocus(3X11)


NAME
       XSetInputFocus, XGetInputFocus - control input focus

SYNTAX
       XSetInputFocus(display, focus, revertto, time)
             Display *display;
             Window focus;
             int revertto;
             Time time;

       XGetInputFocus(display, focusreturn, reverttoreturn)
             Display *display;
             Window *focusreturn;
             int *reverttoreturn;

ARGUMENTS
       display   Specifies the connection to the X server.

       focus     Specifies the window, PointerRoot, or None.

       focusreturn
                 Returns the focus window, PointerRoot, or None.

       revertto Specifies where the input focus reverts to if the window
                 becomes not viewable.  You can pass RevertToParent,
                 RevertToPointerRoot, or RevertToNone.

       reverttoreturn
                 Returns the current focus state (RevertToParent,
                 RevertToPointerRoot, or RevertToNone).

       time      Specifies the time.  You can pass either a timestamp or
                 CurrentTime.

DESCRIPTION
       The XSetInputFocus function changes the input focus and the last-
       focus-change time.  It has no effect if the specified time is earlier
       than the current last-focus-change time or is later than the current
       X server time.  Otherwise, the last-focus-change time is set to the
       specified time (CurrentTime is replaced by the current X server
       time).  XSetInputFocus causes the X server to generate FocusIn and
       FocusOut events.

       Depending on the focus argument, the following occurs:

       ·    If focus is None, all keyboard events are discarded until a new
            focus window is set, and the revert_to argument is ignored.

       ·    If focus is a window, it becomes the keyboard's focus window.
            If a generated keyboard event would normally be reported to this
            window or one of its inferiors, the event is reported as usual.
            Otherwise, the event is reported relative to the focus window.

       ·    If focus is PointerRoot, the focus window is dynamically taken
            to be the root window of whatever screen the pointer is on at
            each keyboard event.  In this case, the revert_to argument is
            ignored.

       The specified focus window must be viewable at the time
       XSetInputFocus is called, or a BadMatch error results.  If the focus
       window later becomes not viewable, the X server evaluates the
       revert_to argument to determine the new focus window as follows:

       ·    If revert_to is RevertToParent, the focus reverts to the parent
            (or the closest viewable ancestor), and the new revert_to value
            is taken to be RevertToNone.

       ·    If revert_to is RevertToPointerRoot or RevertToNone, the focus
            reverts to PointerRoot or None, respectively.  When the focus
            reverts, the X server generates FocusIn and FocusOut events, but
            the last-focus-change time is not affected.

       XSetInputFocus can generate BadMatch, BadValue, and BadWindow errors.

       The XGetInputFocus function returns the focus window and the current
       focus state.

DIAGNOSTICS
       BadValue  Some numeric value falls outside the range of values
                 accepted by the request.  Unless a specific range is
                 specified for an argument, the full range defined by the
                 argument's type is accepted.  Any argument defined as a set
                 of alternatives can generate this error.

       BadWindow A value for a Window argument does not name a defined
                 Window.

SEE ALSO
       XWarpPointer(3X11)
       Xlib - C Language X Interface


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