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# Replacements for getevent() and pollevent(),
# and new functions ungetevent() and sync().
# Every library module should ideally use this instead of
# stdwin.{get,poll}event(), so applications can use the services
# of ungetevent() and sync().
import stdwin
# Events read ahead are stored in this queue.
#
queue = []
# Replacement for getevent().
#
def getevent():
if queue:
event = queue[0]
del queue[0]
return event
else:
return stdwin.getevent()
# Replacement for pollevent().
#
def pollevent():
if queue:
return getevent()
else:
return stdwin.pollevent()
# Push an event back in the queue.
#
def ungetevent(event):
queue.insert(0, event)
# Synchronize the display. It turns out that this is the way to
# force STDWIN to call XSync(), which some (esoteric) applications need.
# (This is stronger than just flushing -- it actually waits for a
# positive response from the X server on the last command issued.)
#
def sync():
while 1:
event = stdwin.pollevent()
if not event: break
queue.append(event)
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