Optimizing component styles and performance

When using ActionScript 2.0, one of the most processor-intensive calls in a component framework is the setStyle call. The setStyle call executes efficiently, but the call is intensive because of the way it is implemented. The setStyle call is not always necessary in all applications, but if you use it, consider its performance effect.

To enhance performance, you can change styles before they are loaded, calculated, and applied to the objects in your SWF file. If you can change styles before the styles are loaded and calculated, you do not have to call setStyle.

To improve performance when using styles, set properties on each object as objects are instantiated. When you dynamically attach instances to the Stage, set properties in initObj in the call that you make to createClassObject(), as the following ActionScript shows:

createClassObject(ComponentClass, "myInstance", 0, {styleName:"myStyle", color:0x99CCFF});

For instances that you place directly on the Stage, you can use onClipEvent() for each instance, or you can use subclasses (recommended). For information on subclasses, see About writing a subclass in Learning ActionScript 2.0 in Adobe Flash.

If you must restyle your components, you can improve efficiency in your application by using the Loader component. To implement several styles in different components, place each component in its own SWF file. If you change styles on the Loader component and reload the SWF file, the components in the SWF file are recreated. When the component is recreated, the cache of styles is emptied, and the style for the component is reset and referenced again.