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POTo pass a parameter to event listener in AS3 the simple way... does it exist?
 

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  1. POTo pass a parameter to event listener in AS3 the simple way... does it exist?
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    <p>Expected / pseudo example:</p> <pre><code>stage.addEventListener(MouseEvent.CLICK, onClick.someWayToPassParameters(true, 123, 4.56, "string")); function onClick(e:MouseEvent):void { trace("Received " + someWayToRetrieveParameters().b/i/n/s + "."); } </code></pre> <p>For many years (3~4), on every website, forum, blog, wherever I searched, people tell me there's no simple way to do this. They usually suggest to:</p> <ul> <li><p><em>Add the listener to a dynamic object, where you can set the value to an extra property and reference it (e.target.property / e.currentTarget.property) in the function.</em></p> <p>Not all classes are dynamic. It won't work on a Sprite, for example.</p></li> <li><p><em>Extend the class of the object with a custom class to add property or to just make it dynamic.</em></p> <p>You'll have to create a whole new tweak class everytime.</p></li> <li><p><em>Use an anonymous function as the event handler.</em></p> <p>There's no reference (and it's ugly). To remove the listener to free resources you're forced to do it from inside the function itself with arguments.callee.</p></li> <li><p><em>Call another function, using the parameter, inside the event handler.</em></p> <p>And where in the event handler call does the parameter go?</p></li> <li><p><em>Keep the event handler in the same scope as the parameter.</em></p> <p>Breach to a total semantic mess.</p></li> <li><p><em>Encapsulate both event handler definition and addEventListener call in a function receiving the target and parameters.</em></p> <p>It can mix scopes, but it's a close one. You have to be careful, though.</p></li> </ul> <p>...Among many other suggested workarounds.</p> <p>All I want is just to <strong>pass an argument</strong> to the event handler so I can use it inside its function, just like any normal function!</p> <p>Am I asking for too much?</p>
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    1. COedited my answer to use a separate class which handles handler creation, storage and registration.
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