235 lines
6.8 KiB
Groff
235 lines
6.8 KiB
Groff
.\"
|
|
.\" $XFree86: xc/doc/man/Xi/XListDev.man,v 1.2 2001/01/27 18:20:21 dawes Exp $
|
|
.\"
|
|
.\"
|
|
.\" Copyright ([\d,\s]*) by Hewlett-Packard Company, Ardent Computer,
|
|
.\"
|
|
.\" Permission to use, copy, modify, distribute, and sell this documentation
|
|
.\" for any purpose and without fee is hereby granted, provided that the above
|
|
.\" copyright notice and this permission notice appear in all copies.
|
|
.\" Ardent, and Hewlett-Packard make no representations about the
|
|
.\" suitability for any purpose of the information in this document. It is
|
|
.\" provided \`\`as is'' without express or implied warranty.
|
|
.\"
|
|
.\" $Xorg: XListDev.man,v 1.3 2000/08/17 19:41:56 cpqbld Exp $
|
|
.ds xL Programming with Xlib
|
|
.TH XListInputDevices __LIB_MAN_SUFFIX__ __xorgversion__ "X FUNCTIONS"
|
|
.SH NAME
|
|
XListInputDevices, XFreeDeviceList \- list available input devices
|
|
.SH SYNTAX
|
|
.HP
|
|
XDeviceInfo *XListInputDevices\^(\^Display *\fIdisplay\fP\^, int
|
|
*\fIndevices_return\fP\^);
|
|
.HP
|
|
int XFreeDeviceList\^(\^XDeviceInfo *\fIlist\fP\^);
|
|
.SH ARGUMENTS
|
|
.TP 12
|
|
.I display
|
|
Specifies the connection to the X server.
|
|
.TP 12
|
|
.I ndevices_return
|
|
Specifies a pointer to a variable where the number of available devices can
|
|
be returned.
|
|
.TP 12
|
|
.I list
|
|
Specifies the list of devices to free. The \fIXFreeDeviceList\fP function
|
|
frees the list of available extension input devices.
|
|
.SH DESCRIPTION
|
|
The \fIXListInputDevices\fP
|
|
request lists the available extension input devices. This list includes the
|
|
X pointer and X keyboard, any other input devices that are currently accessible
|
|
through the X server, and any input devices that are not currently accessible
|
|
through the X server but could be accessed if requested.
|
|
.LP
|
|
Some server implementations may make all input devices available at the time
|
|
the server is initialized. Others may wait until requested by a client to
|
|
access an input device. In the latter case, it is possible that an input
|
|
device will be listed as available at one time but not at another.
|
|
.LP
|
|
For each input device available to the server, the XListInputDevices
|
|
request returns an XDeviceInfo structure. That structure contains a
|
|
pointer to a list of structures, each of which contains information about
|
|
one class of input supported by the device.
|
|
|
|
The XDeviceInfo structure is defined as follows:
|
|
|
|
.DS
|
|
.nf
|
|
typedef struct _XDeviceInfo
|
|
{
|
|
XID id;
|
|
Atom type;
|
|
char *name;
|
|
int num_classes;
|
|
int use;
|
|
XAnyClassPtr inputclassinfo;
|
|
} XDeviceInfo;
|
|
.fi
|
|
.DE
|
|
.LP
|
|
The id is a number in the range 0-128 that uniquely identifies
|
|
the device. It is assigned to the device when it is initialized by the server.
|
|
.LP
|
|
The type field is of type Atom and indicates the nature
|
|
of the device.
|
|
.LP
|
|
The name field contains a pointer to a null-terminated
|
|
string that corresponds to one of the defined device
|
|
types. The name will correspond to one of the following
|
|
strings (defined in the header file \fIXI.h\fP:
|
|
.LP
|
|
.DS
|
|
XI_MOUSE
|
|
XI_TABLET
|
|
XI_KEYBOARD
|
|
XI_TOUCHSCREEN
|
|
XI_TOUCHPAD
|
|
XI_BUTTONBOX
|
|
XI_BARCODE
|
|
XI_TRACKBALL
|
|
XI_QUADRATURE
|
|
XI_ID_MODULE
|
|
XI_ONE_KNOB
|
|
XI_NINE_KNOB
|
|
XI_KNOB_BOX
|
|
XI_SPACEBALL
|
|
XI_DATAGLOVE
|
|
XI_EYETRACKER
|
|
XI_CURSORKEYS
|
|
XI_FOOTMOUSE
|
|
XI_JOYSTICK
|
|
.DE
|
|
.LP
|
|
These names may be directly compared with the name field of the
|
|
XDeviceInfo structure, or used in an XInternAtom request to return
|
|
an atom that can be compared with the type field of the XDeviceInfo
|
|
structure.
|
|
.LP
|
|
The num_classes field is a number in the
|
|
range 0-255 that specifies the number of input classes
|
|
supported by the device for which information is
|
|
returned by ListInputDevices. Some input classes, such
|
|
as class Focus and class Proximity do not have any
|
|
information to be returned by ListInputDevices.
|
|
.LP
|
|
The use field specifies how the device is currently
|
|
being used. If the value is \fIIsXKeyboard\fP, the device is
|
|
currently being used as the X keyboard. If the value
|
|
is \fIIsXPointer\fP, the device is currently being used as
|
|
the X pointer. If the value is \fIIsXExtensionDevice\fP, the
|
|
device is available for use as an extension device.
|
|
.LP
|
|
The inputclassinfo field contains a pointer to the first input-class
|
|
specific data. The first two fields are common to all
|
|
classes.
|
|
.LP
|
|
The class field is a number in the range 0-255.
|
|
It uniquely identifies the class of input for which
|
|
information is returned. Currently defined classes
|
|
are KeyClass, ButtonClass, and ValuatorClass.
|
|
.LP
|
|
The length field is a number in the range 0- 255.
|
|
It specifies the number of bytes of data that are
|
|
contained in this input class. The length includes the
|
|
class and length fields.
|
|
.LP
|
|
The XKeyInfo structure describes the characteristics of the keys on the
|
|
device. It is defined as follows:
|
|
.LP
|
|
.DS
|
|
.nf
|
|
typedef struct _XKeyInfo {
|
|
XID class;
|
|
int length;
|
|
unsigned short min_keycode;
|
|
unsigned short max_keycode;
|
|
unsigned short num_keys;
|
|
} XKeyInfo;
|
|
.fi
|
|
.DE
|
|
.LP
|
|
min_keycode is of type KEYCODE. It specifies the
|
|
minimum keycode that the device will report. The
|
|
minimum keycode will not be smaller than 8.
|
|
.LP
|
|
max_keycode is of type KEYCODE. It specifies the
|
|
maximum keycode that the device will report. The
|
|
maximum keycode will not be larger than 255.
|
|
.LP
|
|
num_keys specifies the number of keys that the device has.
|
|
.LP
|
|
The XButtonInfo structure defines the characteristics of the buttons
|
|
on the device. It is defined as follows:
|
|
.LP
|
|
.DS
|
|
.nf
|
|
typedef struct _XButtonInfo {
|
|
XID class;
|
|
int length;
|
|
short num_buttons;
|
|
} XButtonInfo;
|
|
.fi
|
|
.DE
|
|
.LP
|
|
num_buttons specifies the number of buttons that the device has.
|
|
.LP
|
|
The XValuatorInfo structure defines the characteristics of the valuators
|
|
on the device. It is defined as follows:
|
|
.LP
|
|
.DS
|
|
.nf
|
|
typedef struct _XValuatorInfo {
|
|
XID class;
|
|
int length;
|
|
unsigned char num_axes;
|
|
unsigned char mode;
|
|
unsigned long motion_buffer;
|
|
XAxisInfoPtr axes;
|
|
} XValuatorInfo;
|
|
.fi
|
|
.DE
|
|
num_axes contains the number of axes the device supports.
|
|
.LP
|
|
mode is a constant that has one of the following
|
|
values: Absolute or Relative. Some devices allow the
|
|
mode to be changed dynamically via the SetDeviceMode
|
|
request.
|
|
.LP
|
|
motion_buffer_size is a cardinal number that specifies
|
|
the number of elements that can be contained in the
|
|
motion history buffer for the device.
|
|
.LP
|
|
The axes field contains a pointer to an XAxisInfo structure.
|
|
.LP
|
|
The XAxisInfo structure is defined as follows:
|
|
.LP
|
|
.DS
|
|
.nf
|
|
typedef struct _XAxisInfo {
|
|
int resolution;
|
|
int min_value;
|
|
int max_value;
|
|
} XAxisInfo;
|
|
.fi
|
|
.DE
|
|
.LP
|
|
The resolution contains a number in counts/meter.
|
|
.LP
|
|
The min_val field contains a number that specifies
|
|
the minimum value the device reports for this axis.
|
|
For devices whose mode is Relative, the min_val field
|
|
will contain 0.
|
|
.LP
|
|
The max_val field contains a number that specifies
|
|
the maximum value the device reports for this axis.
|
|
For devices whose mode is Relative, the max_val field
|
|
will contain 0.
|
|
.LP
|
|
To free the \fIXDeviceInfo\fP array created by \fIXListInputDevices\fP,
|
|
use \fIXFreeDeviceList\fP.
|
|
.SH DIAGNOSTICS
|
|
none.
|
|
.SH "SEE ALSO"
|
|
.br
|
|
\fI\*(xL\fP
|