Initial revision

Lib/lib-stdwin/stdwinq.py

@@ -0,0 +1,53 @@
+# 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)