XkbSetAccessXTimeout - Man Page

Configures the AccessXTimeout options for a keyboard device

Synopsis

Bool XkbSetAccessXTimeout (Display *display, unsigned int device_spec, unsigned short timeout, unsigned int ctrls_mask, unsigned int ctrls_values, unsigned short opts_mask, unsigned short opts_values);

Arguments

display

connection to X server

device_spec

device to configure, or XkbUseCoreKbd

timeout

seconds idle until AccessXTimeout occurs

ctrls_mask

boolean controls to modify

ctrls_values

new bits for controls selected by ctrls_mask

opts_mask

ax_options to change

opts_values

new bits for ax_options selected by opts_mask

Description

In environments where computers are shared, features such as SlowKeys present a  problem: if SlowKeys is on, the keyboard can appear to be unresponsive because  keys are not accepted until they are held for a certain period of time. To help  solve this problem, Xkb provides an AccessXTimeout control to automatically  change the enabled/disabled state of any boolean controls and to change the  value of the AccessXKeys and AccessXFeedback control attributes if the keyboard  is idle for a specified period of time.

When a timeout as specified by AccessXTimeout occurs and a control is  consequently modified, Xkb generates an XkbControlsNotify event. For more  information on XkbControlsNotify events.

timeout specifies the number of seconds the keyboard must be idle before the controls  are modified. ctrls_mask specifies what controls are to be enabled or disabled, and ctrls_values specifies whether those controls are to be enabled or disabled. The bit values  correspond to those for enabling and disabling boolean controls using XkbChangeEnabledControls.
The opts_mask field specifies which attributes of the AccessXKeys and AccessXFeedback controls  are to be changed, and opts_values specifies the new values for those options. The bit values correspond to those  for the ax_options field of an XkbDescRec.

XkbSetAccessXTimeout sends a request to configure the AccessXTimeout control to the server. It does  not wait for a reply, and normally returns True. If a compatible version of the  Xkb extension is not available in the server, XkbSetAccessXTimeout returns False.

Return Values

True

The XkbSetAccessXTimeout function returns True when a compatible version of the Xkb extension is available in the server.

False

The XkbSetAccessXTimeout function returns False when a compatible version of the Xkb extension is not available in the server.

Structures

The complete description of an Xkb keyboard is given by an XkbDescRec. The component  structures in the XkbDescRec represent the major Xkb components.

typedef struct {
   struct _XDisplay * display;      /* connection to X server */
   unsigned short     flags;        /* private to Xkb, do not modify */
   unsigned short     device_spec;  /* device of interest */
   KeyCode            min_key_code; /* minimum keycode for device */
   KeyCode            max_key_code; /* maximum keycode for device */
   XkbControlsPtr     ctrls;        /* controls */
   XkbServerMapPtr    server;       /* server keymap */
   XkbClientMapPtr    map;          /* client keymap */
   XkbIndicatorPtr    indicators;   /* indicator map */
   XkbNamesPtr        names;        /* names for all components */
   XkbCompatMapPtr    compat;       /* compatibility map */
   XkbGeometryPtr     geom;         /* physical geometry of keyboard */
} XkbDescRec, *XkbDescPtr;

The display field points to an X display structure. The flags field is private to the library: modifying flags may yield unpredictable results. The device_spec field specifies the device identifier of the keyboard input device, or  XkbUseCoreKeyboard, which specifies the core keyboard device. The min_key_code and max_key_code fields specify the least and greatest keycode that can be returned by the keyboard.

Each structure component has a corresponding mask bit that is used in function calls to  indicate that the structure should be manipulated in some manner, such as allocating it  or freeing it. These masks and their relationships to the fields in the XkbDescRec are  shown in Table 1.

Table 1 Mask Bits for XkbDescRec
Mask BitXkbDescRec FieldValue
XkbControlsMaskctrls(1L<<0)
XkbServerMapMaskserver(1L<<1)
XkbIClientMapMaskmap(1L<<2)
XkbIndicatorMapMaskindicators(1L<<3)
XkbNamesMasknames(1L<<4)
XkbCompatMapMaskcompat(1L<<5)
XkbGeometryMaskgeom(1L<<6)
XkbAllComponentsMaskAll Fields(0x7f)

The structure for the XkbControlsNotify event is defined as follows:

    typedef struct {
        int           type;          /* Xkb extension base event code */
        unsigned long serial;        /* X server serial number for event */
        Bool          send_event;    /* True => synthetically generated */
        Display *     display;       /* server connection where event generated */
        Time          time;          /* server time when event generated */
        int           xkb_type;      /* XkbCompatMapNotify */
        int           device;        /* Xkb device ID, will not be XkbUseCoreKbd */
        unsigned int  changed_ctrls; /* bits indicating which controls data have changed*/
        unsigned int  enabled_ctrls; /* controls currently enabled in server */
        unsigned int  enabled_ctrl_changes; /* bits indicating enabled/disabled controls */
        int           num_groups;    /* current number of keyboard groups */
        KeyCode       keycode;       /* != 0 => keycode of key causing change */
        char          event_type;    /* Type of event causing change */
        char          req_major;     /* major event code of event causing change */
        char          req_minor;     /* minor event code of event causing change */
    } XkbControlsNotifyEvent;

See Also

XkbChangeEnabledControls(3)

Info

libX11 1.8.4 X Version 11 XKB FUNCTIONS