Интерактивная система просмотра системных руководств (man-ов)
XSetInputFocus (3)
>> XSetInputFocus (3) ( Разные man: Библиотечные вызовы )
NAME
XSetInputFocus, XGetInputFocus - control input focus
SYNTAX
int XSetInputFocus(Display *display, Window focus, int
revert_to, Time time);
int XGetInputFocus(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 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.
