XSetInputFocus(3X11)    COMMAND REFERENCE    XSetInputFocus(3X11)



NAME
     XSetInputFocus, XGetInputFocus - control input focus

SYNOPSIS
     XSetInputFocus(display, focus, revert_to, time)
           Display *display;
           Window focus;
           int revert_to;
           Time time;

     XGetInputFocus(display, focus_return, revert_to_return)
           Display *display;
           Window *focus_return;
           int *revert_to_return;

ARGUMENTS
     display   Specifies the connection to the X server.

     focus     Specifies the window, PointerRoot, or None.

     focus_return
               Returns the focus window, PointerRoot, or None.

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

     revert_to_return
               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



X Version 11            1 September 1988                        1

XSetInputFocus(3X11)    COMMAND REFERENCE    XSetInputFocus(3X11)



          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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