Flexponential

Evtim and I gave a presentation at 360Flex Denver this year about optimizing performance of item renderers and skins in Flex 4.5 applications.
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Scrolling to the bottom of a spark List after adding an item can be a little tricky especially when adding multiline text. This post demonstrates how to do it using a chat pod as a sample use case.
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If you drag down from the top of an Android phone, you will get a pull down menu that exposes a set of buttons and options. This is sometimes referred to as a “window shade”, see this video for an example. This post demonstrates how to extend a spark SkinnableContainer to simulate this functionality in a mobile Flex application.
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In a mobile Flex application when you navigate to a new view the old view is destroyed. If you then go back to that first view then it is re-instantiated. If you have a List in that initial view then any scroll position changes the user may have done will be lost. This post demonstrates how to save and restore that scroll position when navigating between views.
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Mobile applications often have lists that group items in some way. For example, a contact list might group names by the first letter of the contact’s first name. This post demonstrates how to write a Spark ItemRenderer to simulate this behavior.
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Checking if an element is included or excluded from the current state is a little more involved than just checking the visible property. This post demonstrates a method that returns true when the element is included in the current state.
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This post demonstrates one way of creating a simple wave effect on items in a DataGroup. A post on polyGeek.com reminded me of an old sample I had laying around that was kind of interesting.
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This is an example of a spark List with a custom item renderer that looks like a stacked bar chart.
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Flex 4 has been released. This is a major release of Flex that introduces some new features that allow you an amazing amount of flexibility and power in building killer internet applications.
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The spark BitmapImage component only supports embedded images in Flex 4.0. This post shows how you can get around that limitation by loading an image via a SWFLoader and then pushing that bitmap data into the BitmapImage’s source property.
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