Complex events: the “pickpocket event” on the Rome Metro
Paul Vincent’s Complex Event The best examples are always from real life.* Its hard to make up events like this…. and Complex Events they are! Paul describes the pattern of events that make up this “complex event”.* Actually it’s a good example of theft teamwork that happens everywhere, …. not just in the Eternal City. The puzzle I [...]
Hi,
Some sports predictions suggestions.
Although the Celtics are still playing the Heat. Just being optimistic that they will win. Otherwise, please change to Heat. (9 Replies)
XtAppPeekEvent() XtAppPeekEvent()
Name
XtAppPeekEvent - return, but do not remove the event at the head of an application's input queue; block if no events are available.
Synopsis
Boolean XtAppPeekEvent(app_context, event_return)
XtAppContext app_context;
XEvent *event_return;
Inputs
app_context
Specifies the application context.
Outputs
event_return
Returns the event from the head of the queue, if that event is an X event.
Returns
True if the event at the head of the queue is an X event; False if it is a timer event or an alternate input source event.
Description
If there are X events pending on any of the displays in app_context, XtAppPeekEvent() copies the event from the head of the application
event queue into event_return (without removing the event from the queue) and returns True. If there are no events, it flushes the output
buffers of each display and checks again. If there are still no pending X events on any of the displays, but there are timer or alternate
input events ready, XtAppPeekEvent() returns False.
If there are no events of any kind, XtAppPeekEvent() blocks until one occurs, and then if it is an X event, copies the event (without
removing it from the queue) and returns True or returns False otherwise. Note that XtAppPeekEvent() never calls background work procedures
registered with XtAppAddWorkProc() .
Usage
Programs rarely need this much control over the event dispatching mechanism. Most programs use XtAppMainLoop().
If you want to get X events and remove them from the input queue, consider XtAppNextEvent(). This function also dispatches timer and
alternate input events.
If you want to check for input events without blocking, use XtAppPending(). This function returns a value that indicates which types of
events are pending for an application context, or 0 if no events are pending.
See AlsoXtAppMainLoop(1), XtAppNextEvent(1), XtAppPending(1).
Xt - Event Handling XtAppPeekEvent()
