2006-11-25 10:22:40 -07:00
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.\"
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.\" $XFree86: xc/doc/man/Xi/XChFCtl.man,v 1.2 2001/01/27 18:20:20 dawes Exp $
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.\"
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.\"
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.\" Copyright ([\d,\s]*) by Hewlett-Packard Company, Ardent Computer,
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this documentation
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.\" for any purpose and without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\" Ardent, and Hewlett-Packard make no representations about the
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.\" suitability for any purpose of the information in this document. It is
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.\" provided \`\`as is'' without express or implied warranty.
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.\"
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.\" $Xorg: XChFCtl.man,v 1.3 2000/08/17 19:41:56 cpqbld Exp $
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.ds xL Programming With Xlib
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2007-11-24 09:45:12 -07:00
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.TH XGetFeedbackControl __LIB_MAN_SUFFIX__ __xorgversion__ "X FUNCTIONS"
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2006-11-25 10:22:40 -07:00
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.SH NAME
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XGetFeedbackControl, XChangeFeedbackControl \- query and change input device feedbacks
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.SH SYNTAX
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.HP
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XFeedbackState *XGetFeedbackControl\^(\^Display *\fIdisplay\fP\^, XDevice
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*\fIdevice\fP\^, int *\fInum_feedbacks\fP\^);
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.HP
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int XChangeFeedbackControl\^(\^Display *\fIdisplay\fP\^, XDevice
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*\fIdevice\fP\^, Mask \fImask\fP\^, XFeedbackControl *\fIcontrol\fP\^);
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.SH ARGUMENTS
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.TP 15
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.I display
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Specifies the connection to the X server.
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.TP 15
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.I device
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Specifies the device whose feedbacks are to be queried or modified.
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.TP 15
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.I num_feedbacks
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Specifies an address into which the number of feedbacks supported by the
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device is to be returned.
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.TP 15
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.I mask
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Specifies a mask specific to each type of feedback that describes how
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the feedback is to be modified.
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.TP 15
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.I control
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Specifies the address of an \fIXFeedbackControl\fP structure that contains
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the new values for the feedback.
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.SH DESCRIPTION
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These requests are provided to manipulate those input devices that
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support feedbacks. A \fIBadMatch\fP error will be generated if the
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requested device does not support feedbacks. Whether or not a given
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device supports feedbacks can be determined by examining the information
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returned by the \fIXOpenDevice\fP request. For those devices that
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support feedbacks, \fIXOpenDevice\fP will return an
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\fIXInputClassInfo\fP structure with the input_class field
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equal to the constant \fIFeedbackClass\fP (defined in the file \fIXI.h\fP).
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.LP
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The \fIXGetFeedbackControl\fP request returns a pointer to a list of
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\fIXFeedbackState\fP structures. Each item in this list describes one
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of the feedbacks supported by the device. The items are variable length,
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so each contains its length to allow traversal to the next item in the
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list.
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.LP
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The feedback classes that are currently defined are: \fIKbdFeedbackClass\fP,
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\fIPtrFeedbackClass\fP, \fIStringFeedbackClass\fP, \fIIntegerFeedbackClass\fP,
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\fILedFeedbackClass\fP, and \fIBellFeedbackClass\fP. These constants are
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defined in the file \fIXI.h\fP. An input device may
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support zero or more classes of feedback, and may support multiple feedbacks
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of the same class. Each feedback contains a class identifier and an id
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that is unique within that class for that input device. The id is used
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to identify the feedback when making an \fIXChangeFeedbackControl\fP request.
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.LP
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\fIXGetFeedbackControl\fP can generate a \fIBadDevice\fP or
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\fIBadMatch\fP error.
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.LP
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The \fIXChangeFeedbackControl\fP request modifies the values of one
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feedback on the specified device. The feedback is identified by the id
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field of the \fIXFeedbackControl\fP structure that is passed with the
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request. The fields of the feedback that are to be modified are identified
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by the bits of the mask that is passed with the request.
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.LP
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\fIXChangeFeedbackControl\fP can generate a \fIBadDevice\fP,
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\fIBadMatch\fP, or \fIBadValue\fP error.
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.SH STRUCTURES
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Each class of feedback is described by a structure specific to that class.
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These structures are defined in the file \fIXInput.h\fP.
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\fIXFeedbackState\fP and \fIXFeedbackControl\fP are generic
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structures that contain three fields that are at the beginning of each class
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of feedback:
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.LP
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.DS
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typedef struct {
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.br
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XID class;
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.br
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int length;
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.br
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XID id;
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.br
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} XFeedbackState, XFeedbackControl;
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.DE
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.LP
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The \fIXKbdFeedbackState\fP structure defines the attributes that are
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returned for feedbacks equivalent to those on the X keyboard.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int click;
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int percent;
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int pitch;
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int duration;
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int led_mask;
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int global_auto_repeat;
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char auto_repeats[32];
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} XKbdFeedbackState;
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.fi
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.DE
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.LP
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The \fIXPtrFeedbackState\fP structure defines the attributes that are
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returned for feedbacks equivalent to those on the the X pointer.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int accelNum;
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int accelDenom;
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int threshold;
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} XPtrFeedbackState;
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.fi
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.DE
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.LP
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The \fIXIntegerFeedbackState\fP structure defines attributes that are
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returned for integer feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int resolution;
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int minVal;
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int maxVal;
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} XIntegerFeedbackState;
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.fi
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.DE
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.LP
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The \fIXStringFeedbackState\fP structure defines the attributes that are
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returned for string feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int max_symbols;
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int num_syms_supported;
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KeySym *syms_supported;
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} XStringFeedbackState;
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.fi
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.DE
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.LP
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The \fIXBellFeedbackState\fP structure defines the attributes that are
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returned for bell feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int percent;
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int pitch;
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int duration;
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} XBellFeedbackState;
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.fi
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.DE
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.LP
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The \fIXLedFeedbackState\fP structure defines the attributes that are
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returned for LED feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int led_values;
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} XLedFeedbackState;
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.fi
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.DE
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.LP
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The \fIXPrtFeedbackControl\fP structure defines the attributes that can be
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controlled for pointer feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int accelNum;
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int accelDenom;
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int threshold;
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} XPtrFeedbackControl;
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.fi
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.DE
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.LP
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The \fIXKbdFeedbackControl\fP structure defines the attributes that can be
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controlled for keyboard feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int click;
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int percent;
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int pitch;
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int duration;
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int led_mask;
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int led_value;
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int key;
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int auto_repeat_mode;
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} XKbdFeedbackControl;
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.fi
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.DE
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.LP
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The \fIXStringFeedbackControl\fP structure defines the attributes that can be
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controlled for string feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int num_keysyms;
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KeySym *syms_to_display;
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} XStringFeedbackControl;
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.fi
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.DE
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.LP
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The \fIXIntegerFeedbackControl\fP structure defines the attributes that can
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be controlled for integer feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int int_to_display;
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} XIntegerFeedbackControl;
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.fi
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.DE
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.LP
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The \fIXBellFeedbackControl\fP structure defines the attributes that can be
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controlled for bell feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int percent;
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int pitch;
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int duration;
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} XBellFeedbackControl;
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.fi
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.DE
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.LP
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The \fIXLedFeedbackControl\fP structure defines the attributes that can be
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controlled for LED feedbacks.
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.LP
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.DS
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.nf
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typedef struct {
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XID class;
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int length;
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XID id;
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int led_mask;
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int led_values;
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} XLedFeedbackControl;
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.fi
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.DE
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.SH DIAGNOSTICS
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.TP 12
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\fIBadDevice\fP
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An invalid device was specified. The specified device does not exist or has
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not been opened by this client via \fIXOpenInputDevice\fP. This error may
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also occur if some other client has caused the specified device to become
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the X keyboard or X pointer device via the \fIXChangeKeyboardDevice\fP or
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\fIXChangePointerDevice\fP requests.
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.TP 12
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\fIBadMatch\fP
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This error may occur if an \fIXGetFeedbackControl\fP request was made specifying
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a device that has no feedbacks, or an \fIXChangeFeedbackControl\fP request was
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made with an \fIXFeedbackControl\fP structure that contains an invalid feedback
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type. It may also occur if an invalid combination of mask bits is specified
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(\fIDvKey\fP but no \fIDvAutoRepeatMode\fP for keyboard feedbacks), or if an
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invalid KeySym is specified for a string feedback.
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.TP 12
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\fIBadValue\fP
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Some numeric value falls outside the range of values accepted by the
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\fIXChangeFeedbackControl\fP request.
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Unless a specific range is specified for an argument, the full range defined
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by the argument's type is accepted. Any argument defined as a set of
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alternatives can generate this error.
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.SH "SEE ALSO"
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.br
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\fI\*(xL\fP
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