Most SWF movies contain scripting elements, that allows users to add interactions and behaviours to their SWF symbols. At the SWF level, scripting elements can occur in four locations:
- As Button event handlers, scripts are associated directly with the button
- As Movie Clip event handlers, scripts are associated with the placement of a MovieClip symbol on a timeline
- As InitClip blocks for MovieClips, the scripts are executed when a MovieClip symbol is defined
- As Frame actions, the scripts are executed when a frame is about to be displayed and after InitClip scripts have been executed.
When ActionScript 2.0 classes are used within an SWF, each class is associated with a MovieClip symbol, and the definition of the class is represented as an InitClip script.
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