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XGetFeedbackControl(3X11) XGetFeedbackControl(3X11) NAME XGetFeedbackControl, XChangeFeedbackControl - query and change input device feedbacks SYNOPSIS XFeedbackState * XGetFeedbackControl(display, device, num_feedbacks) Display *display; XDevice *device; int *num_feedbacks; int XChangeFeedbackControl(display, device, mask, control) Display *display; XDevice *device; Mask mask; XFeedbackControl *control; ARGUMENTS Specifies the connection to the X server. Specifies the device whose feedbacks are to be queried or modified. Specifies an address into which the number of feedbacks supported by the device is to be re- turned. Specifies a mask specific to each type of feedback that de- scribes how the feedback is to be modified. Specifies the address of an XFeedbackControl structure that contains the new values for the feedback. DESCRIPTION These requests are provided to manipulate those input devices that sup- port feedbacks. A BadMatch error will be generated if the requested device does not support feedbacks. Whether or not a given device sup- ports 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 in- put_class field equal to the constant FeedbackClass (defined in the file <XI.h>). The XGetFeedbackControl request returns a pointer to a list of XFeed- backState 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, LedFeed- backClass, and BellFeedbackClass. These constants are defined in the file <XI.h>. An input device may support zero or more classes of feed- back, and may support multiple feedbacks of the same class. Each feed- back 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>. XFeedback- State 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 re- turned 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 re- turned for feedbacks equivalent to those on 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 re- turned 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 re- turned 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 re- turned 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 re- turned 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 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. This error may occur if an XGetFeed- backControl 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 DvAu- toRepeatMode for keyboard feedbacks), or if an invalid KeySym is speci- fied for a string feedback. Some numeric value falls outside the range of values accepted by the XChangeFeedbackControl request. Unless a spe- cific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alterna- tives can generate this error. SEE ALSO Programming With Xlib XGetFeedbackControl(3X11)