XSetInputFocus man page on QNX

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XSetInputFocus(3)		XLIB FUNCTIONS		     XSetInputFocus(3)

       XSetInputFocus, XGetInputFocus - control input focus

       int XSetInputFocus(Display *display, Window focus, int revert_to, Time

       int XGetInputFocus(Display *display, Window *focus_return, int

       display	 Specifies the connection to the X server.

       focus	 Specifies the window, PointerRoot, or None.

		 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, RevertTo‐
		 PointerRoot, or RevertToNone.

		 Returns the current focus state (RevertToParent, RevertTo‐
		 PointerRoot, or RevertToNone).

       time	 Specifies the time.  You can pass either a timestamp or Cur‐

       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 spec‐
       ified time (CurrentTime is replaced by the current X server time).
       XSetInputFocus causes the X server to generate FocusIn and FocusOut

       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 win‐
	    dow or one of its inferiors, the event is reported as usual.  Oth‐
	    erwise, 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.

       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.

       Xlib - C Language X Interface

X Version 11			 libX11 1.3.5		     XSetInputFocus(3)
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                           \   /     \   /     \   /    
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