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Using listeners and signals with Nasal: Difference between revisions
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Using listeners and signals with Nasal (view source)
Revision as of 07:56, 24 May 2020
, 24 May 2020→setlistener(): testing indicated that this is the way it works.
(→setlistener(): testing indicated that this is the way it works.) |
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'''<function>''' The second argument is a function object (not a function call!). The function you pass here will be called with the target property node as its sole argument as soon as someone writes to the property. | '''<function>''' The second argument is a function object (not a function call!). The function you pass here will be called with the target property node as its sole argument as soon as someone writes to the property. | ||
'''<startup=0>''' The third argument is optional. If it is non- | '''<startup=0>''' The third argument is optional. If it is non-zero, then it causes the listener to be called initially (but not if runtime is 1). This is useful to let the callback function pick up the node value at startup. | ||
'''<runtime=1>''' The fourth argument is optional, and defaults to 1. This means that the callback function will be executed whenever the property is written to, independent of the value. | '''<runtime=1>''' The fourth argument is optional, and defaults to 1. This means that the callback function will be executed whenever the property is written to, independent of the value. | ||