Spark

Flex 3 SDK Vs. Flex 4 SDK

Now that Flex SDK 4 was released, I thought I'd do a series of posts on the differences between Flex 3 and Flex 4 SDKs that will hopefully help migrate your Flex 3 app to Flex 4 or make the transition from SDK 3 to SDK 4 easier. I will be assuming you already know Flex 3 and will concentrate on the new in Flex 4 compared to Flex 3.

This post will serve as the index of the series, and I will be adding links to the different posts to this one as they become available, so come back from time to time to get updated.

 

sefi 21/04/2010 - 07:33
comparison, flex, Flex, flex 3, flex 4, MX, namespace, sdk 3, sdk 4, Spark
Migrating Flex 3.x application to Flex 4.5 – Tip No. 4

The next tip refers to fonts embedded either with CSS or style tag.

 

The format we know and used in Flex 3.x was:

 

sefi 11/07/2011 - 13:56
embed font, embed-as-cff, embedAsCFF, flash text engine, Flex, flex, flex 3, flex 3 sdk, Flex 4.5, Flex 4.5 SDK, font, migration, Spark
Flex SDK 3 Vs. 4 - Part 1 - Namespaces

Flex 4 added some namespaces, while it still supports the Flex 3 namespaces. This can cause some confusion, more so since some classes are part of two namespaces.

 

While Flex3 used only one namespace (xmlns:mx="http://www.adobe.com/2006/mxml"), Flex4 uses 3 namespaces:
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
Note, that while there's still a mx namespace, the URI is different.

 

Each namespaces defines a component set. The old Flex3 mx namespace is still active but if you use it Flex 4 features will not be available.

 

The fx:namespace includes top-level AS building blocks such as Object, Array etc. but does not include any of the mx or spark component sets. It also includes some mxml tags, like <fx:script>, <fx:style> and <fx:declarations>.

sefi 21/04/2010 - 07:35
comparison, flex, Flex, flex 3, flex 4, MX, namespace, Spark
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