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73 lines
1.7 KiB
Python
73 lines
1.7 KiB
Python
# Standard main loop for *all* STDWIN applications.
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# This requires that applications:
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# - register their windows on creation and unregister them when closed
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# - have a 'dispatch' function as a window member
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import stdwin, stdwinq
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from stdwinevents import *
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# List of windows known to the main loop.
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#
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windows = []
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# Function to register a window.
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#
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def register(win):
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# First test the dispatch function by passing it a null event --
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# this catches registration of unconforming windows.
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win.dispatch(WE_NULL, win, None)
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if win not in windows:
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windows.append(win)
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# Function to unregister a window.
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# It is not an error to unregister an already unregistered window
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# (this is useful for cleanup actions).
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#
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def unregister(win):
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if win in windows:
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windows.remove(win) # Not in 0.9.1
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# 0.9.1 solution:
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#for i in range(len(windows)):
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# if windows[i] = win:
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# del windows[i]
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# break
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# Interfaces used by WindowSched.
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#
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def countwindows():
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return len(windows)
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#
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def anywindow():
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if windows:
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return windows[0]
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else:
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return None
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# Event processing main loop.
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# Return when there are no windows left, or when an unhandled
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# exception occurs. (It is safe to restart the main loop after
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# an unsuccessful exit.)
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# Python's stdwin.getevent() turns WE_COMMAND/WC_CANCEL events
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# into KeyboardInterrupt exceptions; these are turned back in events.
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#
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def mainloop():
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while windows:
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try:
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dispatch(stdwinq.getevent())
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except KeyboardInterrupt:
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dispatch(WE_COMMAND, stdwin.getactive(), WC_CANCEL)
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# Dispatch a single event.
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# Windows not in the windows list don't get their events:
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# events for such windows are silently ignored.
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#
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def dispatch(event):
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if event[1] in windows:
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event[1].dispatch(event)
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