add newListener() method to ofParameter#4784
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arturoc merged 1 commit intoopenframeworks:masterfrom Feb 5, 2016
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if you want to use an ofEventListener to respond to an ofEvent, you have to create one using a templated factory method which is part of ofEvent<T>. Since ofParameter shields users from accessing its data directly by holding it inside a private data `obj`, there is no way to call the `newListener` factory method on a parameter changed event which you want to observe. This PR proposes to add a `newListener` method to `ofParameter`, which will, based on dark templating magick, forward any of its parameters to the `ofEvent` object held by the private `ofParameter::obj`. I wish there was a simpler way, but this seems to me the best way to observe an ofParameter and responding to any changes using a lambda. Minimal testcase: <https://gist.github.com/tgfrerer/f9fc6e3b2ebe88633ab5>
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add newListener() method to ofParameter
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If you want to use an
ofEventListenerto respond to anofEvent, you best create one using a templated factory method which is part ofofEvent<T>.Since ofParameter shields users from accessing its data directly by holding it inside a private data
obj, there is no way to call thenewListenerfactory method on a parameter changed event (changedE) which you want to observe.This PR proposes to add a
newListenermethod toofParameter, which will, based on dark templating magick, forward any of its parameters to theofEventobject held by the privateofParameter::obj.I wish there was a simpler way, but this seems to me the best way to observe an ofParameter and responding to any changes using a lambda.
Minimal testcase:
https://gist.github.com/tgfrerer/f9fc6e3b2ebe88633ab5