XkbGetDeviceInfo

Langue: en

Version: libX11 1.3.3 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

NAME

XkbGetDeviceInfo - Determine whether the X server allows Xkb access to particular capabilities of input devices other than the core X keyboard, or to determine the status of indicator maps, indicator names or button actions on a non-KeyClass extension device

SYNOPSIS

XkbDeviceInfoPtr XkbGetDeviceInfo (Display *dpy, unsigned int which, unsigned int device_spec, unsigned int ind_class, unsigned int ind_id);
     

ARGUMENTS

- dpy
connection to X server
- which
mask indicating information to return
- device_spec
device ID, or XkbUseCoreKbd
- ind_class
feedback class for indicator requests
- ind_id
feedback ID for indicator requests

DESCRIPTION

To determine whether the X server allows Xkb access to particular capabilities of input devices other than the core X keyboard, or to determine the status of indicator maps, indicator names or button actions on a non-KeyClass extension device, use XkbGetDeviceInfo.

XkbGetDeviceInfo returns information about the input device specified by device_spec. Unlike the device_spec parameter of most Xkb functions, device_spec does not need to be a keyboard device. It must, however, indicate either the core keyboard or a valid X Input Extension device.

The which parameter is a mask specifying optional information to be returned. It is an inclusive OR of one or more of the values from Table 1 and causes the returned XkbDeviceInfoRec to contain values for the corresponding fields specified in the table.

                          Table 1 XkbDeviceInfoRec Mask Bits                        
 ____________________________________________________________________________________
 Name                         XkbDeviceInfoRec Value     Capability If Set
                              Fields Effected            
 ____________________________________________________________________________________
 XkbXI_KeyboardsMask                           (1L <<0) Clients can use all
                                                        Xkb requests and events
                                                        with KeyClass devices 
                                                        supported by the input
                                                        device extension.
 
 XkbXI_ButtonActionsMask       num_btns        (1L <<1) Clients can assign key 
                               btn_acts                 actions to buttons 
                                                        non-KeyClass input
                                                        extension devices.
                            
 XkbXI_IndicatorNamesMask      leds->names     (1L <<2) Clients can assign
                                                        names to indicators on
                                                        non-KeyClass input
                                                        extension devices.
                                                              
 XkbXI_IndicatorMapsMask       leds->maps      (1L <<3) Clients can assign
                                                        indicator maps to
                                                        indicators on 
                                                        non-KeyClass input
                                                        extension devices.
 
 XkbXI_IndicatorStateMask      leds->state     (1L <<4) Clients can request 
                                                        the status of indicators
                                                        on non-KeyClass input
                                                        extension devices.
 
 XkbXI_IndicatorsMask          sz_leds         (0x1c)   XkbXI_IndicatorNamesMask |
                               num_leds                 XkbXI_IndicatorMapsMask |
                               leds->*                  XkbXI_IndicatorStateMask
 
 XkbXI_UnsupportedFeaturesMask unsupported     (1L <<15)
 
 XkbXI_AllDeviceFeaturesMask   Those selected  (0x1e)   XkbXI_IndicatorsMask |
                               by Value Column          XkbSI_ButtonActionsMask
                               masks 
 
 XkbXI_AllFeaturesMask         Those selected  (0x1f)   XkbSI_AllDeviceFeaturesMask |
                               by Value Column          XkbSI_KeyboardsMask
                               masks
 
 XkbXI_AllDetailsMask          Those selected  (0x801f) XkbXI_AllFeaturesMask |
                               by Value column          XkbXI_UnsupportedFeaturesMask
                               masks
 

The XkbDeviceInfoRec returned by XkbGetDeviceInfo always has values for name (may be a null string, ""), type, supported, unsupported, has_own_state, dflt_kbd_fd, and dflt_kbd_fb. Other fields are filled in as specified by which.

Upon return, the supported field will be set to the inclusive OR of zero or more bits from Table 1; each bit set indicates an optional Xkb extension device feature supported by the server implementation, and a client may modify the associated behavior.

If the XkbButtonActionsMask bit is set in which, the XkbDeviceInfoRec returned will have the button actions (btn_acts field) filled in for all buttons.

If which includes one of the bits in XkbXI_IndicatorsMask, the feedback class of the indicators must be specified in ind_class, and the feedback ID of the indicators must be specified in ind_id. If the request does not include any of the bits in XkbXI_IndicatorsMask, the ind_class and ind_id parameters are ignored. The class and ID can be obtained via the input device extension XListInputDevices request.

If any of the XkbXI_IndicatorsMask bits are set in which, the XkbDeviceInfoRec returned will have filled in the portions of the leds structure corresponding to the indicator feedback identified by ind_class and ind_id. The leds vector of the XkbDeviceInfoRec is allocated if necessary and sz_leds and num_leds filled in. The led_class, led_id and phys_indicators fields of the leds entry corresponding to ind_class and ind_id are always filled in. If which contains XkbXI_IndicatorNamesMask, the names_present and names fields of the leds structure corresponding to ind_class and ind_id are returned. If which contains XkbXI_IndicatorStateMask, the corresponding state field is updated. If which contains XkbXI_IndicatorMapsMask, the maps_present and maps fields are updated.

Xkb provides convenience functions to request subsets of the information available via XkbGetDeviceInfo. These convenience functions mirror some of the mask bits. The functions all take an XkbDeviceInfoPtr as an input argument and operate on the X Input Extension device specified by the device_spec field of the structure. Only the parts of the structure indicated in the function description are updated. The XkbDeviceInfoRec structure used in the function call can be obtained by calling XkbGetDeviceInfo or can be allocated by calling XkbAllocDeviceInfo.

STRUCTURES

Information about X Input Extension devices is transferred between a client program and the Xkb extension in an XkbDeviceInfoRec structure:

 
 typedef struct {
     char *               name;          /* name for device */
     Atom                 type;          /* name for class of devices */
     unsigned short       device_spec;   /* device of interest */
     Bool                 has_own_state; /* True=>this device has its own state */
     unsigned short       supported;     /* bits indicating supported capabilities */
     unsigned short       unsupported;   /* bits indicating unsupported capabilities */
     unsigned short       num_btns;      /* number of entries in btn_acts */
     XkbAction *          btn_acts;      /* button actions */
     unsigned short       sz_leds;       /* total number of entries in LEDs vector */
     unsigned short       num_leds;      /* number of valid entries in LEDs vector */
     unsigned short       dflt_kbd_fb;   /* input extension ID of default (core kbd) indicator */
     unsigned short       dflt_led_fb;   /* input extension ID of default indicator feedback */
     XkbDeviceLedInfoPtr  leds;          /* LED descriptions */
 } XkbDeviceInfoRec, *XkbDeviceInfoPtr;
     
 

SEE ALSO

XkbAllocDeviceInfo(3), XListInputDevices(3)