Serge NOEL
43 lines
1.4 KiB
Python
43 lines
1.4 KiB
Python
# Provides an example of listening to the PowerManager, and
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# operating a Sensor to indicate changes.
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#
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# Author: Bob Jacobsen, copyright 2005
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# Part of the JMRI distribution
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import jmri
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import java
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import java.beans
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# The sensor number used to indicate the power status is hardcoded
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# below as "100". Change this if you want to use some other sensor.
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#
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# First, define the listener. This one just prints some
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# information on the change, but more complicated code is
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# of course possible.
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class PowerListener(java.beans.PropertyChangeListener):
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def propertyChange(self, event):
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# here, power has changed. Find new state
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power = jmri.InstanceManager.getDefault(jmri.PowerManager).getPower()
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if (power == jmri.PowerManager.ON) :
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state = ACTIVE
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else :
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state = INACTIVE
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sensors.provideSensor("100").setState(state)
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return
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# Second, attach that listener to the PowerManager. The variable m
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# is used to remember the listener so we can remove it later
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p = jmri.InstanceManager.getDefault(jmri.PowerManager)
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m = PowerListener()
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p.addPropertyChangeListener(m)
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# Finally, invoke the listener once to set the initial state
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m.propertyChange(None)
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# This script is done, and leaves behind the PowerListener object
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# listening to any changes. If you want that to stop, in some
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# other script you need to do
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# p.removePropertyListener(m)
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#
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