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Introduction to AS3Signals

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Peter Elst
Peter Elst
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Introduction to AS3Signals Peter Elst - Flex@Beach ’10
Who am I? Freelance Flash Platform consultant Founding Partner of Project Cocoon Multimedia Author to “Object-Oriented ActionScript 3.0” Certified geek
What is AS3Signals? Open source project by Rob Penner Alternative way to working with events in AS3 Inspired by C# events and Signals/Slots in QT Lightweight, easy and fast to use
Lets get back to basics > flash.events.EventDispatcher > flash.events.Event
EventDispatcher Demo
What is wrong with this? Requires inheritance to dispatch events Need to subclass Event to pass around data String references as events rather than objects Misses basic functionality (remove all listeners etc.)
What does AS3Signals do? Uses composition over inheritance Doesn’t require subclassing to pass arguments Listeners subscribe to Objects not a String reference Can hook up to native Events
Signal Most lightweight Signal class Passes any number of arguments Supports optional strong typing for arguments org.osflash.signals.Signal
Signal Demo
DeluxeSignal Does everything Signals does Adds support for target and signal that dispatched it Passes GenericEvent to listener org.osflash.signals.DeluxeSignal
DeluxeSignal Demo
NativeSignal Uses Signal to wrap around native Events Requires object, event type and event class arguments Uses IEventDispatcher to dispatch org.osflash.signals.natives.NativeSignal
NativeSignal Demo
NativeRelaySignal Similar to the NativeSignal class Extends DeluxeSignal Has its own dispatch code rather than IEventDispatcher org.osflash.signals.natives.NativeRelaySignal
Integration with frameworks Robotlegs http://bit.ly/robotlegs-as3signals Swiz http://bit.ly/swignalz
Useful features removeAll - removes all listeners to a signal addOnce - fires a signal event only the first time numListeners - returns how many listeners for a signal There is experimental event bubbling support
How well does it perform? zero listeners one listener
Where can you get it? github.com/robertpenner/as3-signals More information Blog robertpenner.com/flashblog Forum groups.google.com/group/as3-signals Twitter @robpenner
Questions? Thoughts? Feel free to get in touch! Twitter @peterelst Email peter@project-cocoon.com Blog www.peterelst.com Website www.project-cocoon.com
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Introduction to AS3Signals

  • 1. Introduction to AS3Signals Peter Elst - Flex@Beach ’10
  • 2. Who am I? Freelance Flash Platform consultant Founding Partner of Project Cocoon Multimedia Author to “Object-Oriented ActionScript 3.0” Certified geek
  • 3. What is AS3Signals? Open source project by Rob Penner Alternative way to working with events in AS3 Inspired by C# events and Signals/Slots in QT Lightweight, easy and fast to use
  • 4. Lets get back to basics > flash.events.EventDispatcher > flash.events.Event
  • 6. What is wrong with this? Requires inheritance to dispatch events Need to subclass Event to pass around data String references as events rather than objects Misses basic functionality (remove all listeners etc.)
  • 7. What does AS3Signals do? Uses composition over inheritance Doesn’t require subclassing to pass arguments Listeners subscribe to Objects not a String reference Can hook up to native Events
  • 8. Signal Most lightweight Signal class Passes any number of arguments Supports optional strong typing for arguments org.osflash.signals.Signal
  • 10. DeluxeSignal Does everything Signals does Adds support for target and signal that dispatched it Passes GenericEvent to listener org.osflash.signals.DeluxeSignal
  • 12. NativeSignal Uses Signal to wrap around native Events Requires object, event type and event class arguments Uses IEventDispatcher to dispatch org.osflash.signals.natives.NativeSignal
  • 14. NativeRelaySignal Similar to the NativeSignal class Extends DeluxeSignal Has its own dispatch code rather than IEventDispatcher org.osflash.signals.natives.NativeRelaySignal
  • 15. Integration with frameworks Robotlegs http://bit.ly/robotlegs-as3signals Swiz http://bit.ly/swignalz
  • 16. Useful features removeAll - removes all listeners to a signal addOnce - fires a signal event only the first time numListeners - returns how many listeners for a signal There is experimental event bubbling support
  • 17. How well does it perform? zero listeners one listener
  • 18. Where can you get it? github.com/robertpenner/as3-signals More information Blog robertpenner.com/flashblog Forum groups.google.com/group/as3-signals Twitter @robpenner
  • 19. Questions? Thoughts? Feel free to get in touch! Twitter @peterelst Email peter@project-cocoon.com Blog www.peterelst.com Website www.project-cocoon.com