MACROMEDIA FLEX - DEVELOPING COMPONENTS AND THEMES Manuale Utente Scaricare il pdf (Pagina 22)

Version#1.0#(May#14,#2009)#

Figure'10')'The'Windowed'Application'H ierarchy'

When!a!DisplayObject!is!added!to!the!stage!(or!children!of!the!root!DisplayObject)!

the!stage!property!is!defined!as!a!reference!to!the!windowed!application’s!stage.!!

Only!the!root!DisplayObject!has!the!stage!property!set!at!construction,!otherwise!

the!stage!property!is!set!when!the!object!is!added!to!the!display!stack!(addChild(),!

Loader,!etc).!!So!when!the!SystemManager,!which!extends!MovieClip!‐>!

DisplayObject,!is!constructed!it!checks!to!see!if!the!stage!property!is!defined,!and!if!

so!it!knows!that!it!must!be!the!root!SystemManager!because!the!stage!was!defined!at!

construction.!

Once!the!SystemManager!determines!it’s!the!root,!it!then!has!the!ability!to!access!its!

own!loaderInfo!property.!!The!loaderInfo!property!contains!an!instance!of!the!

LoaderInfo!Class!which!allows!access!to!information!such!as!the!source!SWF!url,!

parameters!that!have!been!passed!to!the!SWF,!domain!information,!content,!bytes!

loaded,!total!bytes,!etc.!

In!typical!Flash/Flex!development!we!usually!access!the!loaderInfo!details!of!a!

SWFLoader!or!other!Loader!based!Class!when!we!are!explicitly!loading!content!

within!our!application.!!We!use!the!loadInfo!object!as!a!way!to!get!progress!

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MACROMEDIA FLEX - DEVELOPING COMPONENTS AND THEMES Manuale Utente Pagina 22