2006-11-25 11:01:46 -07:00
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.\" Copyright 1993 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be
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.\" included in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the 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 XtApp-Next-Event XtApp-Pending XtApp-Peek-Event XtApp-Process-Event Xt-Dispatch-Event XtApp-Main-Loop 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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.de De
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.\" choose appropriate monospace font
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.\" the imagen conditional, 480,
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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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. \" Note End -- doug kraft 3/85
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..
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.ny0
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.TH XtAppNextEvent __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
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.SH NAME
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XtAppNextEvent, XtAppPending, XtAppPeekEvent, XtAppProcessEvent, XtDispatchEvent, XtAppMainLoop \- query and process events and input
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.SH SYNTAX
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.HP
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void XtAppNextEvent(XtAppContext \fIapp_context\fP, XEvent
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*\fIevent_return\fP);
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.HP
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Boolean XtAppPeekEvent(XtAppContext \fIapp_context\fP, XEvent
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*\fIevent_return\fP);
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.HP
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XtInputMask XtAppPending(XtAppContext \fIapp_context\fP);
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.HP
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void XtAppProcessEvent(XtAppContext \fIapp_context\fP, XtInputMask
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\fImask\fP);
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.HP
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Boolean XtDispatchEvent(XEvent *\fIevent\fP);
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.HP
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void XtAppMainLoop(XtAppContext \fIapp_context\fP);
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.SH ARGUMENTS
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.ds Co that identifies the application
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.IP \fIapp_context\fP 1i
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Specifies the application context \*(Co.
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.IP \fIevent\fP 1i
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Specifies a pointer to the event structure that is to be dispatched
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to the appropriate event handler.
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.IP \fIevent_return\fP 1i
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Returns the event information to the specified event structure.
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.IP \fImask\fP 1i
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Specifies what types of events to process.
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The mask is the bitwise inclusive OR of any combination of
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.ZN XtIMXEvent ,
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.ZN XtIMTimer ,
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.ZN XtIMAlternateInput ,
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and
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.ZN XtIMSignal .
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As a convenience, the \*(tk defines the symbolic name
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.ZN XtIMAll
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to be the bitwise inclusive OR of all event types.
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.SH DESCRIPTION
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If the X event queue is empty,
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.ZN XtAppNextEvent
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flushes the X output buffers of each Display in the application context
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and waits for an event while looking at the other input sources, timeout
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timeout values, and signal handlers and calling any callback procedures
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triggered by them. This wait time can be used for background processing
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(see Section 7.8).
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.LP
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If there is an event in the queue,
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.ZN XtAppPeekEvent
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fills in the event and returns a nonzero value. If no X input is on the
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queue,
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.ZN XtAppPeekEvent
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flushes the output buffer and blocks until input is available
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(possibly calling some timeout callbacks in the process).
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If the input is an event,
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.ZN XtAppPeekEvent
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fills in the event and returns a nonzero value.
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Otherwise, the input is for an alternate input source, and
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.ZN XtAppPeekEvent
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returns zero.
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.LP
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The
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.ZN XtAppPending
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function returns a nonzero value if there are events pending from the
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X server, timer pending, or other input sources pending. The value
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returned is a bit mask that is the OR of
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.ZN XtIMXEvent ,
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.ZN XtIMTimer ,
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.ZN XtIMAlternateInput ,
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and
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.ZN XtIMSignal
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(see
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.ZN XtAppProcessEvent ).
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If there are no events pending,
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.ZN XtAppPending
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flushes the output buffer and returns zero.
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.LP
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The
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.ZN XtAppProcessEvent
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function processes one timer, alternate input, signal source, or X
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event. If there is nothing of the appropriate type to process,
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.ZN XtAppProcessEvent
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blocks until there is.
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If there is more than one type of thing available to process,
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it is undefined which will get processed.
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Usually, this procedure is not called by client applications (see
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.ZN XtAppMainLoop ).
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.ZN XtAppProcessEvent
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processes timer events by calling any appropriate timer callbacks,
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alternate input by calling any appropriate alternate input callbacks,
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signal source by calling any appropriate signal callbacks, and X events
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by calling
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.ZN XtDispatchEvent .
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.LP
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When an X event is received, it is passed to
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.ZN XtDispatchEvent ,
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which calls the appropriate event handlers
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and passes them the widget, the event, and client-specific data
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registered with each procedure.
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If there are no handlers for that event registered,
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the event is ignored and the dispatcher simply returns.
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The order in which the handlers are called is undefined.
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.LP
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The
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.ZN XtDispatchEvent
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function sends those events to the event handler functions that
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have been previously registered with the dispatch routine.
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.ZN XtDispatchEvent
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returns
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.ZN True
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if it dispatched the event to some handler and
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.ZN False
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if it found no handler to dispatch the event to.
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The most common use of
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.ZN XtDispatchEvent
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is to dispatch events acquired with the
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.ZN XtAppNextEvent
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procedure.
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However, it also can be used to dispatch user-constructed events.
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.ZN XtDispatchEvent
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also is responsible for implementing the grab semantics for
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.ZN XtAddGrab .
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.LP
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The
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.ZN XtAppMainLoop
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function first reads the next incoming X event by calling
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.ZN XtAppNextEvent
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and then it dispatches the event to the appropriate registered procedure
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by calling
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.ZN XtDispatchEvent .
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This constitutes the main loop of \*(tk applications,
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and, as such, it does not return unless
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.ZN XtAppSetExitFlag
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is called.
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Applications are expected to exit in response to some user action.
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There is nothing special about
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.ZN XtAppMainLoop ;
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it is simply an loop that calls
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.ZN XtAppNextEvent
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and then
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.ZN XtDispatchEvent ,
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until
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.ZN XtAppGetExitFlag ()
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returns true.
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.LP
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Applications can provide their own version of this loop,
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which tests some global termination flag or tests that the number
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of top-level widgets is larger than zero before circling back to the call to
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.ZN XtAppNextEvent .
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.SH "SEE ALSO"
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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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