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Chapter 17. Unlocking the Power of Movie... > Controlling the Visual Stacking Orde...

Controlling the Visual Stacking Order of Movie Clips

Movie clips in a Flash document appear as if on clear pieces of acetate, so that where there is no graphical content at a higher stratum, elements on lower strata are visible. To control which movies appear in front of or behind other movies on the Stage, referred to as the visual stacking order, you need to understand how clips in a Flash document are arranged hierarchically.

The movie clip hierarchy combines two paradigms: the “sandwich” and the “tree.” Specifically, a Flash document is organized into one or more sandwich-like levels. Within each level, clips are organized into a tree-like hierarchy, with clips vertically organized in a parent-child hierarchy, and the visual stacking order of siblings (child clips of the same parent) managed using depth numbers. Thus, the overall Flash document is a “sandwich of trees.” If a movie has only one level, you deal only with a tree-like structure.


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