R – Flex component visibility on application

actionscript-3apache-flexmxml

Is there a way to tell at runtime if a flex UIComponent is in the user's view or not.
For example, if I have a tabNavigator with a combobox on each tab, is there a property of the comboBox that will tell me if it is visible to the user or not when I switch from one tab to another?
I know it is not the comboBox.visible property. That is set to "true" for both comboboxes. I want a property that will change when I switch from one tab to another making the comboBox visible to the user. I don't know what that property is.

Best Answer

What you actually need to do to determine if a UIComponent / DisplayObject truly visible is to check the "visible" property for that object AND the visible property of all its parents. Please see my answer to a related question here (includes code):

Flex: Determine if a component is showing

Related Solutions

R – Define possible values for a property in Flex

Use the Inspectable metadata tag. In your case you'll want to explicitly use the enumeration attribute.

[Inspectable( enumeration="one,two,three" )]
public var myProp:String;

R – Create instances of flex custom component by passing in type

You can instantiate an arbitrary named type through ActionScript's "reflection API":

var clazz:Class = Class(getDefinitionByName("class.from.your.xml.file.Name"));
var component:Object = new clazz();

http://livedocs.adobe.com/flex/3/langref/flash/utils/package.html#getDefinitionByName()

If you get an error about the type not existing, this is because it isn't linked from elsewhere in your application and the compiler only adds classes that are referenced. You can work around this using the following compiler arg:

includes class [...]

Links one or more classes to the resulting application SWF file, whether or not those classes are required at compile time.

http://livedocs.adobe.com/flex/3/html/compilers_14.html#157203

Best Answer

Related Solutions

R – Define possible values for a property in Flex

R – Create instances of flex custom component by passing in type

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