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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
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+'\" t
+.\" Copyright (c) 1999 - Sun Microsystems, Inc.
+.\" All rights reserved.
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining a
+.\" copy of this software and associated documentation files (the
+.\" "Software"), to deal in the Software without restriction, including
+.\" without limitation the rights to use, copy, modify, merge, publish,
+.\" distribute, and/or sell copies of the Software, and to permit persons
+.\" to whom the Software is furnished to do so, provided that the above
+.\" copyright notice(s) and this permission notice appear in all copies of
+.\" the Software and that both the above copyright notice(s) and this
+.\" permission notice appear in supporting documentation.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+.\" OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+.\" HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
+.\" INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
+.\" FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+.\" NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+.\" WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of a copyright holder
+.\" shall not be used in advertising or otherwise to promote the sale, use
+.\" or other dealings in this Software without prior written authorization
+.\" of the copyright holder.
+.\"
+.TH XkbForceDeviceBell __libmansuffix__ __xorgversion__ "XKB FUNCTIONS"
+.SH NAME
+XkbForceDeviceBell \- Rings the bell on any keyboard, overriding user preference
+settings for audible bells
+.SH SYNOPSIS
+.B Bool XkbForceDeviceBell
+(
+.I display,
+.I window,
+.I device_spec,
+.I bell_class,
+.I bell_id,
+.I percent
+)
+.br
+ Display *\fI display \fP\^;
+.br
+ Window \fI window \fP\^;
+.br
+ unsigned int \fI device_spec \fP\^;
+.br
+ unsigned int \fI bell_class \fP\^;
+.br
+ unsigned int \fI bell_id \fP\^;
+.br
+ int \fI percent \fP\^;
+.if n .ti +5n
+.if t .ti +.5i
+.SH ARGUMENTS
+.TP
+.I \- display
+connection to the X server
+.TP
+.I \- window
+event window, or None
+.TP
+.I \- device_spec
+device ID, or XkbUseCoreKbd
+.TP
+.I \- bell_class
+input extension class of the bell to be rung
+.TP
+.I \- bell_id
+input extension ID of the bell to be rung
+.TP
+.I \- percent
+relative volume, which can range from -100 to 100 inclusive
+.SH DESCRIPTION
+.LP
+The core X protocol allows only applications to explicitly sound the system bell
+with a
+given duration, pitch, and volume. Xkb extends this capability by allowing clients
+to
+attach symbolic names to bells, disable audible bells, and receive an event
+whenever the
+keyboard bell is rung. For the purposes of this document, the
+.I audible
+bell is defined to be the system bell, or the default keyboard bell, as opposed to
+any
+other audible sound generated elsewhere in the system.
+You can ask to receive XkbBellNotify events when any client rings any one of the
+following:
+
+.IP \(bu 5
+The default bell
+.IP \(bu 5
+Any bell on an input device that can be specified by a bell_class and bell_id pair
+.IP \(bu 5
+Any bell specified only by an arbitrary name. (This is, from the server's point of
+view,
+merely a name, and not connected with any physical sound-generating device. Some
+client
+application must generate the sound, or visual feedback, if any, that is associated
+with
+the name.)
+
+.LP
+You can also ask to receive XkbBellNotify events when the server rings the default
+bell
+or if any client has requested events only (without the bell sounding) for any of
+the
+bell types previously listed.
+
+You can disable audible bells on a global basis. For example, a client that
+replaces the
+keyboard bell with some other audible cue might want to turn off the AudibleBell
+control
+to prevent the server from also generating a sound and avoid cacophony. If you
+disable
+audible bells and request to receive XkbBellNotify events, you can generate
+feedback
+different from the default bell.
+
+You can, however, override the AudibleBell control by calling one of the functions
+that
+force the ringing of a bell in spite of the setting of the AudibleBell control -
+.I XkbForceDeviceBell
+or
+.I XkbForceBell.
+In this case the server does not generate a bell event.
+
+Just as some keyboards can produce keyclicks to indicate when a key is pressed or repeating, Xkb
+can provide feedback for the controls by using special beep codes. The AccessXFeedback control
+is used to configure the specific types of operations that generate feedback.
+
+Bell Names
+
+You can associate a name to an act of ringing a bell by converting the name to an Atom
+and then using this name when you call the functions listed in this chapter. If an event
+is generated as a result, the name is then passed to all other clients interested in receiving
+XkbBellNotify events. Note that these are arbitrary names and that there is no binding to any
+sounds. Any sounds or other effects (such as visual bells on the screen) must be generated by a
+client application upon receipt of the bell event containing the name. There is no default name
+for the default keyboard bell. The server does generate some predefined bells for the AccessX
+controls. These named bells are shown in Table 1; the name is included in any bell event sent to
+clients that have requested to receive XkbBellNotify events.
+
+.TS
+c s
+l l
+lW(4i) l.
+Table 1 Predefined Bells
+_
+Action Named Bell
+_
+Indicator turned on AX_IndicatorOn
+Indicator turned off AX_IndicatorOff
+More than one indicator changed state AX_IndicatorChange
+Control turned on AX_FeatureOn
+Control turned off AX_FeatureOff
+More than one control changed state AX_FeatureChange
+T{
+SlowKeys and BounceKeys about to be turned on or off
+T} AX_SlowKeysWarning
+SlowKeys key pressed AX_SlowKeyPress
+SlowKeys key accepted AX_SlowKeyAccept
+SlowKeys key rejected AX_SlowKeyReject
+Accepted SlowKeys key released AX_SlowKeyRelease
+BounceKeys key rejected AX_BounceKeyReject
+StickyKeys key latched AX_StickyLatch
+StickyKeys key locked AX_StickyLock
+StickyKeys key unlocked AX_StickyUnlock
+.TE
+
+Audible Bells
+
+Using Xkb you can generate bell events that do not necessarily ring the system bell. This
+is useful if you need to use an audio server instead of the system beep. For example,
+when an audio client starts, it could disable the audible bell (the system bell) and then
+listen for XkbBellNotify events. When it receives a XkbBellNotify event, the audio client could
+then send a request to an audio server to play a sound.
+
+You can control the audible bells feature by passing the XkbAudibleBellMask to
+.I XkbChangeEnabledControls.
+If you set XkbAudibleBellMask on, the server rings the system bell when a bell event occurs.
+This is the default. If you set XkbAudibleBellMask off and a bell event occurs, the server does
+not ring the system bell unless you call
+.I XkbForceDeviceBell
+or
+.I XkbForceBell.
+
+Audible bells are also part of the per-client auto-reset controls.
+
+Bell Functions
+
+Use the functions described in this section to ring bells and to generate bell events.
+
+The input extension has two types of feedbacks that can generate bells - bell feedback and
+keyboard feedback. Some of the functions in this section have
+.I bell_class
+and
+.I bell_id
+parameters; set them as follows: Set
+.I bell_class
+to BellFeedbackClass or KbdFeedbackClass. A device can have more than one feedback of each type;
+set
+.I bell_id
+to the particular bell feedback of
+.I bell_class
+type.
+
+Table 2 shows the conditions that cause a bell to sound or an XkbBellNotifyEvent to be generated
+when a bell function is called.
+
+.TS
+c s s s
+l l l l
+l l l l.
+Table 2 Bell Sounding and Bell Event Generating
+_
+Function called AudibleBell Server sounds a bell Server sends an
+XkbBellNotifyEvent
+_
+XkbDeviceBell On Yes Yes
+XkbDeviceBell Off No Yes
+XkbBell On Yes Yes
+XkbBell Off No Yes
+XkbDeviceBellEvent On or Off No Yes
+XkbBellEvent On or Off No Yes
+XkbDeviceForceBell On or Off Yes No
+XkbForceBell On or Off Yes No
+.TE
+
+
+If a compatible keyboard extension isn't present in the X server,
+.I XkbForceDeviceBell
+immediately returns False. Otherwise,
+.I XkbForceDeviceBell
+rings the bell as specified for the display and keyboard device and returns
+True. Set
+.I percent
+to be the volume relative to the base volume for the keyboard as described for
+.I XBell.
+
+There is no
+.I name
+parameter because
+.I XkbForceDeviceBell
+does not cause an XkbBellNotify event.
+
+You can call
+.I XkbBell
+without first initializing the keyboard extension.
+.SH STRUCTURES
+.LP
+Xkb generates XkbBellNotify events for all bells except for those resulting from
+calls to
+.I XkbForceDeviceBell
+and
+.I XkbForceBell.
+To receive XkbBellNotify events under all possible conditions, pass
+XkbBellNotifyMask in
+both the
+.I bits_to_change
+and
+.I values_for_bits
+parameters to
+.I XkbSelectEvents.
+
+The XkbBellNotify event has no event details. It is either selected or it is not.
+However, you can call
+.I XkbSelectEventDetails
+using XkbBellNotify as the
+.I event_type
+and specifying XkbAllBellNotifyMask in
+.I bits_to_change
+and
+.I values_for_bits.
+This has the same effect as a call to
+.I XkbSelectEvents.
+
+The structure for the XkbBellNotify event type contains:
+.nf
+
+ typedef struct _XkbBellNotify {
+ int type; /\(** Xkb extension base event code */
+ unsigned long serial; /\(** X server serial number for event */
+ Bool send_event; /\(** True => synthetically generated */
+ Display * display; /\(** server connection where event generated */
+ Time time; /\(** server time when event generated */
+ int xkb_type; /\(** XkbBellNotify */
+ unsigned int device; /\(** Xkb device ID, will not be XkbUseCoreKbd */
+ int percent; /\(** requested volume as % of max */
+ int pitch; /\(** requested pitch in Hz */
+ int duration; /\(** requested duration in microseconds */
+ unsigned int bell_class; /\(** X input extension feedback class */
+ unsigned int bell_id; /\(** X input extension feedback ID */
+ Atom name; /\(** "name" of requested bell */
+ Window window; /\(** window associated with event */
+ Bool event_only; /\(** False -> the server did not produce a beep */
+ } XkbBellNotifyEvent;
+
+.fi
+If your application needs to generate visual bell feedback on the screen when it
+receives
+a bell event, use the window ID in the XkbBellNotifyEvent, if present.
+.SH "SEE ALSO"
+.BR XBell (3X11),
+.BR XkbBell (__libmansuffix__),
+.BR XkbBellNotify (__libmansuffix__),
+.BR XkbChangeEnabledControls (__libmansuffix__),
+.BR XkbDeviceBell (__libmansuffix__),
+.BR XkbForceBell (__libmansuffix__),
+.BR XkbForceDeviceBell (__libmansuffix__),
+.BR XkbSelectEventDetails (__libmansuffix__),
+.BR XkbSelectEvents (__libmansuffix__)
+
+
+
+