MACROMEDIA FLEX - DEVELOPING COMPONENTS AND THEMES Manuale Utente Pagina 2

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Version#1.0#(May#14,#2009)#
+
Table+of+ Contents+
Table+of+Contents ........................................................................................................ 2!
Introduction ................................................................................................................ 4!
How!T o!Read!This!Paper ........................................................................................................................................5 !
A+Brief+History+of+Flex.................................................................................................. 5!
It’s!All!About! the! Frames ........................................................................................................................................5!
The#Elastic#Ra cetrack...............................................................................................................................................6!
Managing#the#Racetrack.........................................................................................................................................7!
The+Life+Stages+of+a+Flex+Application............................................................................ 8!
An!Introduction!Into!the!Component!Lifecycle ............................................................................................8!
Componen t#Phases:#Overview ...............................................................................................................................8!
Componen t#Phases:#Construction#(birth) ........................................................................................................9!
Componen t#Phases:#Addition#(birth) .............................................................................................................. 10!
Componen t#Phases:#In itialization#(birth)..................................................................................................... 11!
Componen t#Phases:#In validation#(gro wth#/#maturity )........................................................................... 12!
The#Invalidation#and#Vali dation#Cycle........................................................................................................... 12!
The#Th ree#Types#Of#Invalidation ...................................................................................................................... 15!
Componen t#Phases:#Validation#(g row th#maturity).................................................................................. 16!
Componen t#Phases:#Update#(maturity)......................................................................................................... 18!
Componen t#Phases:#Removal#(death) ............................................................................................................ 18!
A+Flex+Application+Is+Born.......................................................................................... 19!
Flex!Appli cation!Phases:! Con struction .......................................................................................................... 20!
The#Dark#Art#of#the#Fl ex#Compiler ................................................................................................................... 20!
At#the#Top#Sits#the#SystemManager ................................................................................................................ 21!
Flex!Appli cation!Phases:! Initialization .......................................................................................................... 23!
Managing#Externalizatio n .................................................................................................................................. 23!
Flex!Appli cation!Phases:! Preloading .............................................................................................................. 24!
Flex!Appli cation!Phases:! Child!Creation ....................................................................................................... 25!
Flex!Appli cation!Phase:!Child!Displa y............................................................................................................ 26!
Flex!Appli cation!Phase:!Destruction............................................................................................................... 27!
Flex+Component+Development+Best+Practices............................................................ 27!
Using!Constru ction................................................................................................................................................. 27!
JIT#and#the#Constructor ........................................................................................................................................ 28!
Using!Initi alizatio n ................................................................................................................................................. 29!
If#You#Mus t#Ov erride#Initialize....................................................................................................................... 30!
The!Invalidati on‐Validation!Cycle!and!Methods ....................................................................................... 30!
Separating#the#Phases........................................................................................................................................... 30!
Usi ng#Dirty#Flags ..................................................................................................................................................... 32!
Implementing#Val idation#Methods.................................................................................................................. 32!
Using!And!Accessing!Styl es ................................................................................................................................ 34!
Applying#Style s ......................................................................................................................................................... 34!
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