MACROMEDIA FLEX - DEVELOPING COMPONENTS AND THEMES Uživatelský manuál stáhnout pdf (Strana 12)

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

After!createChildren()!is!complete,!the!childrenCreated()!method!is!called.!!This!

method!is!responsible!for!enabling!the!first!Invalidation‐Validation!cycle,!which!we!

will!discuss!in!the!next!section.!

The!last!two!methods!called!by!initialize()!are!initializeAccessibility() and!

initializationComplete().!!The!method!initializeAccessibility()!configures!

the!component!to!use!the!Flash!Player’s!accessibility!system,!if!enabled.!!The!method!

initializationComplete()!is!the!last!method!called!and!is!used!to!define!the!

processedDescriptors!setter!method!which!dispatches!the!

FlexEvent.INITIALIZED!event.!!!

Although!initialization!has!been!completed,!there!is!still!work!to!be!done!before!the!

component!is!ready!for!use.!!For!more!information!about!how!to!use!initialization,!

refer!to!the!section!Using!Initialization!later!on!in!this!document.!

Component+Phases:+Invalidation+(growth+/+maturity)+

Invalidation!is!the!first!phase!of!the!component!lifecycle!that!gets!repeated!

throughout!the!entire!life!of!the!component!and!is!also!the!first!phase!of!growth!and!

maturity.!!After!the!createChildren()!method!is!called,!the!UIComponent’s!

childrenCreated()!method!is!called.!!In!this!method,!three!sub‐methods!are!

called

!which!begin!the!invalidation!phase:!invalidateProperties(),!

invalidateSize()!and!invalidateDisplayList().!

The+Invalidation+and+Validation+Cycle+

We!can’t!really!look!too!deeply!into!Invalidation!with!out!talking!about!how!it!

interacts!and!defines!the!following!Validation!phase.!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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finer#control.#This#process#will#be#examined#in#grea ter#depth#as#we#mo ve#along. #

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MACROMEDIA FLEX - DEVELOPING COMPONENTS AND THEMES Uživatelský manuál Strana 12