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X11R7.4 - man page for xsetdevicefocus (x11r4 section 3)

XSetDeviceFocus(3)			   X FUNCTIONS			       XSetDeviceFocus(3)

       XSetDeviceFocus, XGetDeviceFocus - control extension input device focus

       XSetDeviceFocus(display, device, focus, revert_to, time)
	     Display *display;
	     Display *device;
	     Window focus;
	     int revert_to;
	     Time time;

       XGetDeviceFocus(display, device, focus_return, revert_to_return, time_return)
	     Display *display;
	     Display *device;
	     Window *focus_return;
	     int *revert_to_return;
	     int *time_return;

       display	   Specifies the connection to the X server.

       device	   Specifies the device whose focus is to be queried or changed.

       focus	   Specifies the window, PointerRoot, FollowKeyboard, or None.

		   Returns the focus window, PointerRoot, FollowKeyboard, or None.

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

		   Returns the current focus state RevertToParent, RevertToPointerRoot, RevertTo-
		   FollowKeyboard, or RevertToNone.

       time_return Returns the last_focus_time for the device.

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

       The XSetDeviceFocus request changes the focus of the specified device and its  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).  XSetDeviceFocus causes the X server to generate DeviceFocusIn  and  DeviceFocusOut

       Depending on the focus argument, the following occurs:

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

       o    If focus is a window, it becomes the device's focus window.  If  a	generated  device
	    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.

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

       o    If focus is FollowKeyboard, the focus window is dynamically taken to be the window to
	    which the X keyboard focus is set at each input event.

       The  specified  focus  window must be viewable at the time XSetDeviceFocus 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:

       o    If revert_to is RevertToParent, the focus reverts to the parent (or the closest view-
	    able ancestor), and the new revert_to value is taken to be RevertToNone.

       o    If revert_to is RevertToPointerRoot,  RevertToFollowKeyboard,  or  RevertToNone,  the
	    focus reverts to PointerRoot, FollowKeyboard, or None, respectively.

       When  the  focus  reverts, the X server generates DeviceFocusIn and DeviceFocusOut events,
       but the last-focus-change time is not affected.

       Input extension devices are not required to support the ability to be focused.  Attempting
       to  set the focus of a device that does not support this request will result in a BadMatch
       error.  Whether or not given device can support this request  can  be  determined  by  the
       information  returned  by  XOpenDevice.	For those devices that support focus, XOpenDevice
       will return an XInputClassInfo structure with the input_class field equal to the  constant
       FocusClass (defined in the file XI.h).

       XSetDeviceFocus can generate BadDevice, BadMatch, BadValue, and BadWindow errors.

       The XGetDeviceFocus request returns the focus window and the current focus state.

       Not  all input extension devices can be focused.  Attempting to query the focus state of a
       device that can't be focused results in a BadMatch error.  A device that  can  be  focused
       returns information for input Class Focus when an XOpenDevice request is made.

       XGetDeviceFocus can generate BadDevice, and BadMatch errors.

       BadDevice   An  invalid	device was specified.  The specified device does not exist or has
		   not been opened by this client via  XOpenInputDevice.   This  error	may  also
		   occur if the specified device is the X keyboard or X pointer device.

       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 alterna-
		   tives can generate this error.

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

       BadMatch    This error may occur if an XGetDeviceFocus or XSetDeviceFocus request was made
		   specifying  a  device  that	the  server  implementation  does not allow to be

       Programming with Xlib

X Version 11				   libXi 1.2.1			       XSetDeviceFocus(3)

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