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1 # Replacements for getevent() and pollevent(),
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2 # and new functions ungetevent() and sync().
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3
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4
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5 # Every library module should ideally use this instead of
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6 # stdwin.{get,poll}event(), so applications can use the services
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7 # of ungetevent() and sync().
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8
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9
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10 import stdwin
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11
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12
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13 # Events read ahead are stored in this queue.
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14 #
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15 queue = []
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16
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17
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18 # Replacement for getevent().
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19 #
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20 def getevent():
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21 if queue:
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22 event = queue[0]
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23 del queue[0]
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24 return event
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25 else:
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26 return stdwin.getevent()
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27
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28
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29 # Replacement for pollevent().
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30 #
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31 def pollevent():
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32 if queue:
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33 return getevent()
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34 else:
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35 return stdwin.pollevent()
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36
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37
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38 # Push an event back in the queue.
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39 #
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40 def ungetevent(event):
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41 queue.insert(0, event)
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42
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43
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44 # Synchronize the display. It turns out that this is the way to
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45 # force STDWIN to call XSync(), which some (esoteric) applications need.
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46 # (This is stronger than just flushing -- it actually waits for a
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47 # positive response from the X server on the last command issued.)
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48 #
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49 def sync():
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50 while 1:
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51 event = stdwin.pollevent()
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52 if not event: break
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53 queue.append(event)
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