.\" $Xorg: XtExtEvDis.man,v 1.3 2000/08/17 19:42:00 cpqbld Exp $ .\" .\" Copyright (c) 1993, 1994 X Consortium .\" .\" 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, sublicense, .\" and/or sell copies of the Software, and to permit persons to whom the .\" Software furnished to do so, subject to the following conditions: .\" .\" The above copyright notice and this permission notice shall be included in .\" all copies or substantial portions of the Software. .\" .\" 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. IN NO EVENT SHALL .\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, .\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF .\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE .\" SOFTWARE. .\" .\" Except as contained in this notice, the name of the X Consortium shall not .\" be used in advertising or otherwise to promote the sale, use or other .\" dealing in this Software without prior written authorization from the .\" X Consortium. .\" .\" $XFree86: xc/doc/man/Xt/XtExtEvDis.man,v 1.4 2003/04/28 22:18:18 herrb Exp $ .\" .ds tk X Toolkit .ds xT X Toolkit Intrinsics \- C Language Interface .ds xI Intrinsics .ds xW X Toolkit Athena Widgets \- C Language Interface .ds xL Xlib \- C Language X Interface .ds xC Inter-Client Communication Conventions Manual .ds Rn 3 .ds Vn 2.2 .hw XtInsert-Event-Type-Handler XtRemove-Event-Type-Handler XtSet-Event-Dispatcher XtDispatch-Event-To-Widget wid-get .na .de Ds .nf .\\$1D \\$2 \\$1 .ft 1 .ps \\n(PS .\".if \\n(VS>=40 .vs \\n(VSu .\".if \\n(VS<=39 .vs \\n(VSp .. .de De .ce 0 .if \\n(BD .DF .nr BD 0 .in \\n(OIu .if \\n(TM .ls 2 .sp \\n(DDu .fi .. .de FD .LP .KS .TA .5i 3i .ta .5i 3i .nf .. .de FN .fi .KE .LP .. .de IN \" send an index entry to the stderr .. .de C{ .KS .nf .D .\" .\" choose appropriate monospace font .\" the imagen conditional, 480, .\" may be changed to L if LB is too .\" heavy for your eyes... .\" .ie "\\*(.T"480" .ft L .el .ie "\\*(.T"300" .ft L .el .ie "\\*(.T"202" .ft PO .el .ie "\\*(.T"aps" .ft CW .el .ft R .ps \\n(PS .ie \\n(VS>40 .vs \\n(VSu .el .vs \\n(VSp .. .de C} .DE .R .. .de Pn .ie t \\$1\fB\^\\$2\^\fR\\$3 .el \\$1\fI\^\\$2\^\fP\\$3 .. .de ZN .ie t \fB\^\\$1\^\fR\\$2 .el \fI\^\\$1\^\fP\\$2 .. .de NT .ne 7 .ds NO Note .if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2 .if \\n(.$ .if !'\\$1'C' .ds NO \\$1 .ie n .sp .el .sp 10p .TB .ce \\*(NO .ie n .sp .el .sp 5p .if '\\$1'C' .ce 99 .if '\\$2'C' .ce 99 .in +5n .ll -5n .R .. . \" Note End -- doug kraft 3/85 .de NE .ce 0 .in -5n .ll +5n .ie n .sp .el .sp 10p .. .ny0 .TH XtInsertEventTypeHandler 3Xt __xorgversion__ "XT FUNCTIONS" .SH NAME XtInsertEventTypeHandler, XtRemoveEventTypeHandler, XtRegisterExtensionSelector, XtSetEventDispatcher, XtDispatchEventToWidget \- extension event handling .SH SYNTAX .HP void XtInsertEventTypeHandler(Widget \fIwdget\fP, int \fIevent_type\fP, XtPointer \fIselect_data\fP, XtEventHandler \fIproc\fP, XtPointer \fIclient_data\fP, XtListPosition \fIposition\fP); .HP void XtRemoveEventTypeHandler(Widget \fIwdget\fP, int \fIevent_type\fP, XtPointer \fIselect_data\fP, XtEventHandler \fIproc\fP, XtPointer \fIclient_data\fP); .HP void XtRegisterExtensionSelector(Display* \fIdisplay\fP, int \fImin_event_type\fP, int \fImax_event_type\fP, XtExtensionSelectProc \fIproc\fP, XtPointer \fIclient_data\fP); .HP XtEventDispatchProc XtSetEventDispatcher(Widget \fIwidget\fP, int \fIevent_type\fP, XtEventDispatchProc \fIproc\fP); .HP Boolean XtDispatchEventToWidget(Widget \fIwidget\fP, XEvent* \fIevent\fP); .SH ARGUMENTS .IP \fIwidget\fP 1i Specifies the widget for this event handler. Must be of class Core or any subclass thereof. .IP \fIevent_type\fP 1i Specifies the event type. .IP \fIselect_data\fP 1i Specifies data used to select or deselect events from the server. .IP \fIproc\fP 1i Specifies the proc. .IP \fIclient_data\fP 1i Specifies additional data to be passed to the event handler. .IP \fIposition\fP 1i Specifies when the event handler is to be called relative to other previously registered handlers. .IP \fIdisplay\fP 1i Specifies the display. .IP \fImin_event_type,\ max_event_type\fP 1i Specifies the range of event types for this extension. .IP \fIevent\fP 1i Specifies a pointer to the event to be dispatched. .SH DESCRIPTION The .ZN XtInsertEventTypeHandler function registeres a procedure with the dispatch mechanism that is to be called when an event that matches the specified \fIevent_type\fP is dispatched to the specified \fIwidget\fP. .LP If \fIevent_type\fP is one of the core X protocol events then \fIselect_data\fP must be a pointer to a value of type .ZN EventMask , indicating the event mask to be used to select for the desired event. This event mask will be included in the value returned by .ZN XtBuildEventMask . If the widget is realized .ZN XtInsertEventTypeHandler calls .ZN XSelectInput if necessary. Specifying NULL for \fIselect_data\fP is equivalent to specifying a pointer to an event mask containing 0. This is similar to the .ZN XtInsertRawEventHandler function. .LP If \fIevent_type\fP specifies an extension event type then the semantics of the data pointed to by \fIselect_data\fP are defined by the extension selector registered for the specified event type. .LP In either case the Intrinsics are not required to copy the data pointed to by \fIselect_data\fP, so the caller must ensure that it remains valid as long as the event handler remains registered with this value of \fIselect_data\fP. .LP The \fIposition\fP argument allows the client to control the order of the invocation of event handlers registered for the same event type. If the client does not care about the order, it should normally specify .ZN XtListTail , which registers this event handler after any previously registered handlers for this event type. .LP The .ZN XtRemoveEventTypeHandler function unregisters an even handler registered with .ZN XtInsertEventTypeHandler for the specified event type. The request is ignored if \fIclient_data\fP does not match the value given with the handler was registered. .LP If \fIevent_type\fP specifies on of the core X protocol events, \fIselect_data\fP must be a pointer to a value of type .ZN EventMask , indicating the mask to be used to deselect for the appropriate event. If the widget is realized, .ZN XtRemoveEventTypeHandler calls .ZN XSelectInput if necessary. Specifying NULL for \fIselect_data\fP is equivalent to specifying a pointer to an event mask containing 0. This is similar to the .ZN XtRemoveRawEventHandler function. .LP If \fIevent_type\fP specifies an extension event type then the semantics of the data pointed to by \fIselect_data\fP are defined by the extension selector registered for the specified event type. .LP The .ZN XtRegisterExtensionSelector function registers a procedure to arrange for the delivery of extension events to widgets. .LP If \fImin_event_type\fP and \fImax_event_type\fP match the parameters to a previous call to .ZN XtRegisterExtensionSelector for the same display, the \fIproc\fP and \fIclient_data\fP replace the previously registered values. If the range specified by \fImin_event_type\fP and \fImax_event_type\fP overlaps the range of the parameters to a previous call for the same display in any other way, an error results. .LP The .ZN XtSetEventDispatcher function registes the event dispatcher procedure specified by \fIproc\fP for event swith the type \fIevent_type\fP. The previously registered dispatcher (or the default dispatcher if there was no previousl registered dispatcher) is returned. If \fIproc\fP is NULL, the default procedure is restored for the specified type. .LP In the future, when .ZN XtDispatchEvent is called with an event of \fIevent_type\fP, the specified \fIproc\fP (or the default dispatcher) will be invoked to determine a widget ot which to dispatch the event. .LP The .ZN XtDispatchEventToWidget function scans the list of registered event handlers for the specified widget and calls each handler that has been registered for the specified event type, subject to the \fIcontinue_to_dispatch\fP value returned by each handler. The Intrinsics behave as if event handlers were registered at the head of the list for .ZN Expose , .ZN NoExpose , .ZN GraphicsExpose , and .ZN VisibilityNotify events to invoke the widget's expose procedure according to the exposure compression rules and to update the widget's \fIvisible\fP field if \fIvisible_interest\fP is .ZN True . These internal event handlers never set \fIcontinue_to_dispatch\fP to .ZN False . .LP .ZN XtDispatchEventToWidget returns .ZN True if any event handler was called and .ZN False otherwise. .LP .SH "SEE ALSO" XtGetKeyboardFocusWidget(3Xt) .br \fI\*(xT\fP .br \fI\*(xL\fP