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NAME

       XGetFeedbackControl, XChangeFeedbackControl - query and change input
       device feedbacks

SYNOPSIS

       #include <X11/extensions/XInput.h>

       XFeedbackState *XGetFeedbackControl( Display *display,
                                            XDevice *device,
                                            int *num_feedbacks);

       int XChangeFeedbackControl( Display *display,
                                   XDevice *device,
                                   Mask mask,
                                   XFeedbackControl *control);

       display
              Specifies the connection to the X server.

       device
              Specifies the device whose feedbacks are to be queried
              or modified.

       num_feedbacks
              Specifies an address into which the number of feedbacks
              supported by thedevice is to be returned.

       mask
              Specifies a mask specific to each type of feedback that
              describes howthe feedback is to be modified.

       control
              Specifies the address of an XFeedbackControl structure
              that containsthe new values for the feedback.

DESCRIPTION

           These requests are provided to manipulate those input devices
           that support feedbacks. A BadMatch error will be generated if
           the requested device does not support feedbacks. Whether or not
           a given device supports feedbacks can be determined by
           examining the information returned by the XOpenDevice request.
           For those devices that support feedbacks, XOpenDevice will
           return an XInputClassInfo structure with the input_class field
           equal to the constant FeedbackClass (defined in the file XI.h).

           The XGetFeedbackControl request returns a pointer to a list of
           XFeedbackState structures. Each item in this list describes one
           of the feedbacks supported by the device. The items are
           variable length, so each contains its length to allow traversal
           to the next item in the list.

           The feedback classes that are currently defined are:
           KbdFeedbackClass, PtrFeedbackClass, StringFeedbackClass,
           IntegerFeedbackClass, LedFeedbackClass, and BellFeedbackClass.
           These constants are defined in the file XI.h. An input device
           may support zero or more classes of feedback, and may support
           multiple feedbacks of the same class. Each feedback contains a
           class identifier and an id that is unique within that class for
           that input device. The id is used to identify the feedback when
           making an XChangeFeedbackControl request.

           XGetFeedbackControl can generate a BadDevice or BadMatch error.

           The XChangeFeedbackControl request modifies the values of one
           feedback on the specified device. The feedback is identified by
           the id field of the XFeedbackControl structure that is passed
           with the request. The fields of the feedback that are to be
           modified are identified by the bits of the mask that is passed
           with the request.

           XChangeFeedbackControl can generate a BadDevice, BadMatch, or
           BadValue error.

       Structures

           Each class of feedback is described by a structure specific to
           that class. These structures are defined in the file XInput.h.
           XFeedbackState and XFeedbackControl are generic structures that
           contain three fields that are at the beginning of each class of
           feedback:

           typedef struct {
           XID class;
           int length;
           XID id;
           } XFeedbackState,
           XFeedbackControl;

           The XKbdFeedbackState structure defines the attributes that are
           returned for feedbacks equivalent to those on the X keyboard.

           typedef struct {
           XID class;
           int length;
           XID id;
           int click;
           int percent;
           int pitch;
           int duration;
           int led_mask;
           int global_auto_repeat;
           char auto_repeats[32];
           } XKbdFeedbackState;

           The XPtrFeedbackState structure defines the attributes that are
           returned for feedbacks equivalent to those on the the X
           pointer.

           typedef struct {
           XID class;
           int length;
           XID id;
           int accelNum;
           int accelDenom;
           int threshold;
           } XPtrFeedbackState;

           The XIntegerFeedbackState structure defines attributes that are
           returned for integer feedbacks.

           typedef struct {
           XID class;
           int length;
           XID id;
           int resolution;
           int minVal;
           int maxVal;
           } XIntegerFeedbackState;

           The XStringFeedbackState structure defines the attributes that
           are returned for string feedbacks.

           typedef struct {
           XID class;
           int length;
           XID id;
           int max_symbols;
           int num_syms_supported;
           KeySym *syms_supported;
           } XStringFeedbackState;

           The XBellFeedbackState structure defines the attributes that
           are returned for bell feedbacks.

           typedef struct {
           XID class;
           int length;
           XID id;
           int percent;
           int pitch;
           int duration;
           } XBellFeedbackState;

           The XLedFeedbackState structure defines the attributes that are
           returned for LED feedbacks.

           typedef struct { XID class;
           int length;
           XID id;
           int led_values;
           } XLedFeedbackState;

           The XPrtFeedbackControl structure defines the attributes that
           can be controlled for pointer feedbacks.

           typedef struct {
           XID class;
           int length;
           XID id;
           int accelNum;
           int accelDenom;
           int threshold;
           } XPtrFeedbackControl;

           The XKbdFeedbackControl structure defines the attributes that
           can be controlled for keyboard feedbacks.

           typedef struct {
           XID class;
           int length;
           XID id;
           int click;
           int percent;
           int pitch;
           int duration;
           int led_mask;
           int led_value;
           int key;
           int auto_repeat_mode;
           } XKbdFeedbackControl;

           The XStringFeedbackControl structure defines the attributes
           that can be controlled for string feedbacks.

           typedef struct {
           XID class;
           int length;
           XID id;
           int num_keysyms;
           KeySym  *syms_to_display;
           } XStringFeedbackControl;

           The XIntegerFeedbackControl structure defines the attributes
           that can be controlled for integer feedbacks.

           typedef struct {
           XID class;
           int length;
           XID id;
           int int_to_display;
           } XIntegerFeedbackControl;

           The XBellFeedbackControl structure defines the attributes that
           can be controlled for bell feedbacks.

           typedef struct {
           XID     class;
           int     length;
           XID     id;
           int     percent;
           int     pitch;
           int     duration;
           } XBellFeedbackControl;

           The XLedFeedbackControl structure defines the attributes that
           can be controlled for LED feedbacks.

           typedef struct {
           XID     class;
           int     length;
           XID     id;
           int     led_mask;
           int     led_values;
           } XLedFeedbackControl;

DIAGNOSTICS

           BadDevice
                  An invalid device was specified. The specified device
                  does not exist or has not been opened by this client via
                  XOpenInputDevice. This error may also occur if some
                  other client has caused the specified device to become
                  the X keyboard or X pointer device via the
                  XChangeKeyboardDevice or XChangePointerDevice requests.

           BadMatch
                  This error may occur if an XGetFeedbackControl request
                  was made specifying a device that has no feedbacks, or
                  an XChangeFeedbackControl request was made with an
                  XFeedbackControl structure that contains an invalid
                  feedback type. It may also occur if an invalid
                  combination of mask bits is specified ( DvKey but no
                  DvAutoRepeatMode for keyboard feedbacks), or if an
                  invalid KeySym is specified for a string feedback.

           BadValue
                  Some numeric value falls outside the range of values
                  accepted by the XChangeFeedbackControl request. Unless a
                  specific range is specified for an argument, the full
                  range defined by the argumentĀ“s type is accepted. Any
                  argument defined as a set of alternatives can generate
                  this error.

[FIXME: source]                   10/02/2009