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XISetFocus

NAME

XISetFocus, XIGetFocus - set or get the device's focus.

SYNOPSIS

 #include <X11/extensions/XInput2.h>
 

 Status XISetFocus( Display *display,
                    int deviceid,
                    Window focus,
                    Time time);
 

 Status XIGetFocus( Display *display,
                    Window *focus_return);
 

 display
        Specifies the connection to the X server.
 

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

 focus
        The new focus window.
 

 focus_return
        Returns the current focus window.
 

 time
        A valid timestamp or CurrentTime.
 

DESCRIPTION

 XISetFocus changes the focus of the specified device ans 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).
 XISetFocus causes the X server to generate core, XI and XI2
 focus events.
 

 If the focus window is None all keyboard events by this device
 are discarded until a new focus window is set. Otherwise, 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.
 

 The specified focus window must be viewable at the time
 XISetFocus is called, or a BadMatch error results. If the focus
 window later becomes not viewable, the focus reverts to the
 parent (or the closest viewable ancestor. When the focus
 reverts, the X server generates core, XI and XI2 focus events
 but the last-focus-change time is not affected.
 

 Attempting to set the focus on a master pointer device or an
 attached slave device will result in a BadDevice error.
 

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

DIAGNOSTICS

 BadValue
        A value is outside of the permitted range.
 

 BadDevice
        An invalid device was specified. The device does not
        exist or is not a appropriate for the type of change.
 

 BadMatch
        The window is not viewable.
 

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