XSetInputFocus(XS)

Syntax

   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

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.

• 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.

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