NAME
XSetInputFocus, XGetInputFocus - control input focus SYNTAX int XSetInputFocus(Display *display, Window focus, int revertto, Time time); int XGetInputFocus(Display *display, Window *focusreturn, int *reverttoreturn); ARGUMENTS display Specifies the connection to the X server. focus Specifies the window, PointerRoot, or None. focusreturn Returns the focus window, PointerRoot, or None. revertto Specifies where the input focus reverts to if the window becomes not viewable. You can pass RevertToParent, RevertTo‐ PointerRoot, or RevertToNone. reverttoreturn Returns the current focus state (RevertToParent, RevertTo‐ PointerRoot, or RevertToNone). time Specifies the time. You can pass either a timestamp or Cur‐ rentTime. 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 spec‐ ified 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 revertto 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 revertto 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 revertto argument to determine the new focus window as follows: · If revertto is RevertToParent, the focus reverts to the parent (or the closest viewable ancestor), and the new revertto value is taken to be RevertToNone. · If revertto 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. SEE ALSO XWarpPointer(3)
Xlib - C Language X Interface X Version 11 libX11 1.6.5 XSetInputFocus(3)