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XSetInputFocus, XGetInputFocus - control input focus


int XSetInputFocus(Display *display, Window focus, int
revert_to, Time time);
int XGetInputFocus(Display *display, Window *focus_return,
int *revert_to_return);


Specifies the connection to the X server.
Specifies the window, PointerRoot, or None.
Returns the focus window, PointerRoot, or None.
Specifies where the input focus reverts to if the window becomes not viewable. You can pass RevertToParent, RevertToPointerRoot, or RevertToNone.
Returns the current focus state (RevertToParent, RevertToPointerRoot, or RevertToNone).
Specifies the time. You can pass either a timestamp or CurrentTime.


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:

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:

XSetInputFocus can generate BadMatch, BadValue, and BadWindow errors.

The XGetInputFocus function returns the focus window and the current focus state.


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

See Also

Xlib - C Language X Interface

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