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A Comparison of Flex 3 and Flex 4 beta

06.19.2009
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New components and containers

As I mentioned earlier, Flex 4 beta introduces a number of new component classes that use the new architecture, which should make skinning and other customizations much more straightforward. Here is a table showing Flex 3 Halo components and their Flex 4 beta Spark counterparts:

Flex 3 Halo Component Flex 4 beta Spark Component
mx.controls.Button spark.components.Button
mx.controls.ButtonBar spark.components.ButtonBar
mx.controls.CheckBox spark.components.CheckBox
mx.controls.ComboBox spark.components.DropDownList (w/o editability)
mx.controls.HorizontalList spark.components.List (with a HorizontalLayout)
mx.controls.HRule spark.primitives.Line
mx.controls.HScrollBar spark.components.HScrollBar
mx.controls.HSlider spark.components.HSlider
mx.controls.Image spark.primitives.BitmapImage
mx.controls.LinkBar spark.components.ButtonBar (with a custom skin)
mx.controls.LinkButton spark.components.Button (with a custom skin)
mx.controls.List spark.components.List
mx.controls.NumericStepper spark.components.NumericStepper
mx.controls.RadioButton spark.components.RadioButton
mx.controls.RadioButtonGroup spark.components.RadioButtonGroup
mx.controls.TextArea spark.components.TextArea
mx.controls.TextInput spark.components.TextInput
mx.controls.TileList spark.components.List (with a TileLayout)
mx.controls.ToggleButtonBar spark.components.ButtonBar
mx.controls.VideoDisplay spark.components.VideoPlayer
mx.controls.VRule spark.primitives.Line
mx.controls.VScrollBar spark.components.VScrollBar
mx.controls.VSlider

spark.components.VSlider

mx.core.Application spark.components.Application
mx.core.Window spark.components.Window
mx.core.WindowedApplication spark.components.WindowedApplication
mx.containers.Canvas spark.components.Group
mx.containers.HBox spark.components.HGroup
mx.containers.Panel spark.components.Panel
mx.containers.Tile spark.components.Group (with a TileLayout)
mx.containers.VBox spark.components.VGroup

Adobe encourages you to use Halo components and containers along with Spark components. Because Adobe continues to build components atop the same base class (UIComponent), there should be full interoperability between Spark and Halo. Here is a table of the components and containers that do not currently have direct Spark equivalent classes.

Flex 3 classes with no direct Flex 4 beta counterpart
mx.controls.Alert
mx.controls.ColorPicker
mx.controls.DataGrid
mx.controls.DateChooser
mx.controls.DateField
mx.controls.Menu
mx.controls.MenuBar
mx.controls.PopUpButton
mx.controls.PopUpMenuButton
mx.controls.ProgressBar
mx.controls.RichTextEditor
mx.controls.TabBar
mx.controls.Tree
mx.containers.Accordion
mx.containers.ApplicationControlBar
mx.containers.ControlBar
mx.containers.DividedBox
mx.containers.Form
mx.containers.Grid
mx.containers.TabNavigator
mx.containers.TitleWindow
mx.containers.ViewStack
References
Published at DZone with permission of its author, Joan Lafferty. (source)

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