2006-11-25 11:01:46 -07:00
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.\" Copyright (c) 1993, 1994 X Consortium
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2012-03-10 09:45:48 -07:00
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.\"
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2006-11-25 11:01:46 -07:00
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software furnished to do so, subject to the following conditions:
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.\"
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2006-11-25 11:01:46 -07:00
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.\" The above copyright notice and this permission notice shall be included in
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.\" all copies or substantial portions of the Software.
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.\"
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2006-11-25 11:01:46 -07:00
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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.\" SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall not
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.\" be used in advertising or otherwise to promote the sale, use or other
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.\" dealing in this Software without prior written authorization from the
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.\" X Consortium.
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.\"
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.ds tk X Toolkit
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xI Intrinsics
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.ds xW X Toolkit Athena Widgets \- C Language Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.ds Rn 3
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.ds Vn 2.2
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.hw XtAdd-Event-Handler XtAdd-Raw-Event-Handler XtRemove-Event-Handler XtRemove-Raw-Event-Handler XtInsert-Event-Handler XtInsert-Raw-Event-Handler wid-get
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.ps \\n(PS
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.\".if \\n(VS>=40 .vs \\n(VSu
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.\".if \\n(VS<=39 .vs \\n(VSp
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..
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.de De
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.ce 0
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.fi
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.de FD
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.KS
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.nf
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.de FN
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.de IN \" send an index entry to the stderr
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.de C{
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.\"
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.\" choose appropriate monospace font
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.\" the imagen conditional, 480,
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.\" may be changed to L if LB is too
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.\" heavy for your eyes...
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.\"
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.ie "\\*(.T"480" .ft L
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.el .ie "\\*(.T"300" .ft L
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..
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.de C}
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.DE
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.R
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.de NT
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.ds NO Note
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.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
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.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
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.ll -5n
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.R
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..
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. \" Note End -- doug kraft 3/85
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.de NE
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.ce 0
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.in -5n
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.el .sp 10p
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..
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.ny0
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.TH XtAddEventHandler __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
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.SH NAME
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XtAddEventHandler, XtAddRawEventHandler, XtRemoveEventHandler, XtRemoveRawEventHandler, XtInsertEventHandler, XtInsertRawEventHandler \- add and remove event handlers
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.SH SYNTAX
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.HP
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void XtAddEventHandler(Widget \fIw\fP, EventMask \fIevent_mask\fP, Boolean
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\fInonmaskable\fP, XtEventHandler \fIproc\fP, XtPointer \fIclient_data\fP);
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.HP
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void XtAddRawEventHandler(Widget \fIw\fP, EventMask \fIevent_mask\fP, Boolean
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\fInonmaskable\fP, XtEventHandler \fIproc\fP, XtPointer \fIclient_data\fP);
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.HP
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void XtRemoveEventHandler(Widget \fIw\fP, EventMask \fIevent_mask\fP, Boolean
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\fInonmaskable\fP, XtEventHandler \fIproc\fP, XtPointer \fIclient_data\fP);
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.HP
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void XtRemoveRawEventHandler(Widget \fIw\fP, EventMask \fIevent_mask\fP,
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Boolean \fInonmaskable\fP, XtEventHandler \fIproc\fP, XtPointer
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\fIclient_data\fP);
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.HP
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void XtInsertEventHandler(Widget \fIw\fP, EventMask \fIevent_mask\fP, Boolean
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\fInonmaskable\fP, XtEventHandler \fIproc\fP, XtPointer \fIclient_data\fP,
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XtListPosition \fIposition\fP);
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.HP
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void XtInsertRawEventHandler(Widget \fIw\fP, EventMask \fIevent_mask\fP,
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Boolean \fInonmaskable\fP, XtEventHandler \fIproc\fP, XtPointer
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\fIclient_data\fP, XtListPosition \fIposition\fP);
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.HP
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typedef enum { XtListHead, XtListTail } XtListPosition;
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.SH ARGUMENTS
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.IP \fIclient_data\fP 1i
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Specifies additional data to be passed to the client's event handler.
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.ds Em to call or unregister this procedure
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.IP \fIevent_mask\fP 1i
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Specifies the event mask for which \*(Em.
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.ds Nm called or removed
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.IP \fInonmaskable\fP 1i
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Specifies a Boolean value that indicates whether this procedure should be
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\*(Nm on the nonmaskable events
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.Pn ( GraphicsExpose ,
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.ZN NoExpose ,
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.ZN SelectionClear ,
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.ZN SelectionRequest ,
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.ZN SelectionNotify ,
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.ZN ClientMessage ,
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and
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.ZN MappingNotify ).
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.ds Pr \ to be added or removed
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.IP \fIproc\fP 1i
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Specifies the procedure that is\*(Pr.
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.ds Wi for which this event handler is being registered
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.IP \fIw\fP 1i
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Specifies the widget \*(Wi.
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.IP \fIposition\fP 1i
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Specifies when the event handler is to be called relative to other
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previously registered handlers.
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.SH DESCRIPTION
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The
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.ZN XtAddEventHandler
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function registers a procedure with the dispatch mechanism that is
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to be called when an event that matches the mask occurs on the specified
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widget.
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If the procedure is already registered with the same client_data,
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the specified mask is ORed into the existing mask.
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If the widget is realized,
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.ZN XtAddEventHandler
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calls
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.ZN XSelectInput ,
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if necessary.
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.LP
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The
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.ZN XtAddRawEventHandler
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function is similar to
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.ZN XtAddEventHandler
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except that it does not affect the widget's mask and never causes an
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.ZN XSelectInput
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for its events.
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Note that the widget might already have those mask bits set
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because of other nonraw event handlers registered on it.
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.LP
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The
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.ZN XtRemoveRawEventHandler
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function stops the specified procedure from receiving the specified events.
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Because the procedure is a raw event handler,
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this does not affect the widget's mask and never causes a call on
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.ZN XSelectInput .
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.LP
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.ZN XtInsertEventHandler
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is identical to
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.ZN XtAddEventHandler
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with the additional \fIposition\fP argument. if \fIposition\fP is
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.ZN XtListHead ,
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the event handler is registered to that it will be called before
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any event handlers that were previously registered for the same widget.
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If \fIposition\fP is
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.ZN XtListTail ,
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the event handler is registered to be called after any previously
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registered event handlers. If the procedure is already registered with
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the same \fIclient_data\fP value, the specified mask augments the
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existing mask and the procedure is repositioned in the list.
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.LP
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.ZN XtInsertRawEventHandler
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is similar to
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.ZN XtInsertEventHandler
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except that it does not modify the widget's event mask and never causes an
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.ZN XSelectInput
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for the specified events. If the procedure is already registered with the
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same \fIclient_data\fP value, the specified mask augments the existing
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mask and the procedure is repositioned in the list.
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.SH "SEE ALSO"
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XtAppNextEvent(__libmansuffix__),
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XtBuildEventMask(__libmansuffix__)
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.br
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\fI\*(xT\fP
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.br
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\fI\*(xL\fP
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